diff --git a/.github/workflows/build_ascent_gcc.yml b/.github/workflows/build_ascent_gcc.yml index 2d11513d1..72b467ba1 100644 --- a/.github/workflows/build_ascent_gcc.yml +++ b/.github/workflows/build_ascent_gcc.yml @@ -38,8 +38,9 @@ jobs: libreadline-dev \ libsqlite3-dev \ libbz2-dev \ - mpich \ - libmpich-dev \ + openmpi-bin \ + openmpi-common \ + libopenmpi-dev \ cmake - name: Checkout uses: actions/checkout@v2 diff --git a/.github/workflows/build_ascent_macos.yml b/.github/workflows/build_ascent_macos.yml new file mode 100644 index 000000000..7f5147574 --- /dev/null +++ b/.github/workflows/build_ascent_macos.yml @@ -0,0 +1,47 @@ +name: build_ascent_macos + +on: + pull_request: + branches: [ develop ] + +jobs: + build_basic: + name: macOS Build Ascent Clang + runs-on: macos-latest + env: + CC: clang + CXX: clang++ + steps: + - name: Checkout + uses: actions/checkout@v2 + with: + submodules: 'recursive' + - name: Build TPLs + run: | + env enable_mpi=OFF \ + enable_tests=OFF \ + enable_verbose=OFF \ + build_ascent=false \ + build_jobs=2 \ + ./scripts/build_ascent/build_ascent.sh + - name: Configure Ascent + run: | + cmake --version + echo "**** Configuring Ascent" + cmake -S src -B build -C ascent-config.cmake -DCMAKE_INSTALL_PREFIX=install + - name: Build Ascent + run: | + echo "**** Building Ascent" + cmake --build build -j2 + - name: Install Ascent + run: | + echo "**** Installing Ascent" + cmake --install build + - name: Check Install + run: | + echo "**** Checking Ascent using-with-cmake example" + cd install/examples/ascent/using-with-cmake + cmake -S . -B build + cmake --build build --verbose -j2 + export DYLD_LIBRARY_PATH=/home/runner/work/ascent/ascent/install/vtk-m-v2.0.0/lib/:${DYLD_LIBRARY_PATH} + ./build/ascent_render_example diff --git a/.readthedocs.yaml b/.readthedocs.yaml index f155c81b0..680858dad 100644 --- a/.readthedocs.yaml +++ b/.readthedocs.yaml @@ -14,6 +14,12 @@ build: # Build documentation in the docs/ directory with Sphinx sphinx: configuration: src/docs/sphinx/conf.py + # If using Sphinx, optionally build your docs in additional formats such as PDF # formats: # - pdf + +# Set requirements required to build your docs +python: + install: + - requirements: src/docs/sphinx/requirements.txt \ No newline at end of file diff --git a/CHANGELOG.md b/CHANGELOG.md index 13df810b2..caf0cee85 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -4,11 +4,40 @@ Notable changes to Ascent are documented in this file. This changelog started on The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project aspires to adhere to [Semantic Versioning](https://semver.org/spec/v2.0.0.html). +## Unreleased +### Preferred dependency versions for ascent@develop +- conduit@0.8.8 +- vtk-m@2.0.0 + +### Added +- Added parameters to control HDF5 compression options to the Relay Extract. +- Added check to make sure all domain IDs are unique + +### Changed +- Changed the Data Binning filter to accept a `reduction_field` parameter (instead of `var`), and similarly the axis parameters to take `field` (instead of `var`). The `var` style parameters are still accepted, but deprecated and will be removed in a future release. + +## [0.9.2] - Released 2023-06-30 +### Preferred dependency versions for ascent@0.9.2 +- conduit@0.8.8 +- vtk-m@2.0.0 + +### Added +- Automatic camera placement render that uses different types of entropy (data, depth, shading). +- Scene/Render option to manually position color bars +- Added in-memory conduit extract, which allows mesh data to be accessed via ascent.info() +- Added examples that demonstrate how to use Ascent via the Catalyst Conduit Interface. + +### Changed +- Updated Ascent to use VTK-m 2.0 +- Added C++ `Ascent::info()` method that returns a reference to execution info in addition the existing info() method that provides copy out semantics. + + +### Fixed ## [0.9.1] - Released 2023-04-21 ### Preferred dependency versions for ascent@0.9.1 - conduit@0.8.7 -- vtk-m@2.0.0 +- vtk-m@1.9.0 ### Added - Added support for building and running on Windows. @@ -16,7 +45,6 @@ and this project aspires to adhere to [Semantic Versioning](https://semver.org/s - Added CI testing for building Ascent and required third-party libs on Windows. ### Changed -- Updated Ascent to use VTK-m 2.0 - Devil Ray stats are now opt in, instead of opt out to avoid accumulating memory. - `build_ascent.sh` is now a unified script that supports non-device, CUDA, and HIP builds. diff --git a/azure-pipelines.yml b/azure-pipelines.yml index ec371bd60..ac6ff4421 100644 --- a/azure-pipelines.yml +++ b/azure-pipelines.yml @@ -9,8 +9,12 @@ ##### ######################## -# Container Notes: +# Container Notes: ######################## +# 2023/11/10: +# - Base container names changed from alpinedav/ascent-ci to alpinedav/ascent-devel +# - Dropped Ubuntu 18.04 Cuda 11.4.0, migrated tests to Ubuntu 20.04 11.4.3 +# # 2023/04/16: # - Dropped Ubuntu 18.04, migrated tests to Ubuntu 20.04 # - build_ascent.sh {TPLS + Ascent} x {Standard, CUDA, and HIP} are tested via Github Actions @@ -18,12 +22,13 @@ ######################## variables: - ubuntu_20_04_tag: alpinedav/ascent-ci:ubuntu-20.04-devel-tpls_2023-05-05-shaf57286 - ubuntu_22_04_tag: alpinedav/ascent-ci:ubuntu-22.04-devel-tpls_2023-05-05-shaf57286 - ubuntu_18_04_cuda_11_4_0_tag: alpinedav/ascent-ci:ubuntu-18.04-cuda-11.4.0-devel-tpls_2023-05-05-shaf57286 - ubuntu_20_04_rocm_5_1_3_tag: alpinedav/ascent-ci:ubuntu-20.04-rocm-5.1.3-devel-tpls_2023-05-05-shaf57286 - + ubuntu_20_04_tag: alpinedav/ascent-devel:ubuntu-20.04-x86_64-tpls_2023-11-10-shacd1600 + ubuntu_22_04_tag: alpinedav/ascent-devel:ubuntu-22.04-x86_64-tpls_2023-11-10-sha104429 + ubuntu_20_04_cuda_11_4_3_tag: alpinedav/ascent-devel:ubuntu-20.04-cuda-11.4.3-x86_64-tpls_2023-11-10-shacd1600 + ubuntu_20_04_cuda_12_1_1_tag: alpinedav/ascent-devel:ubuntu-20.04-cuda-12.1.1-x86_64-tpls_2023-11-10-sha104429 + ubuntu_20_04_rocm_5_1_3_tag: alpinedav/ascent-devel:ubuntu-20.04-rocm-5.1.3-x86_64-tpls_2023-11-10-shacd1600 + # only build merge target pr to develop trigger: none pr: @@ -438,8 +443,19 @@ stages: COMPILER_FC: gfortran strategy: matrix: - ubuntu_18.04_static_cuda_11.4.0: - containerImage: ${{ variables.ubuntu_18_04_cuda_11_4_0_tag }} + ubuntu_20.04_static_cuda_12.1.1: + containerImage: ${{ variables.ubuntu_20_04_cuda_12_1_1_tag }} + BUILD_SHARED_LIBS: OFF + CMAKE_BUILD_TYPE: Release + ENABLE_DRAY: ON + ENABLE_MFEM: ON + BLT_CXX_STD: c++14 + # static linking unit tests eats up alot of disk space, + # so skip building tests in CI to keep us away from clif + ENABLE_TESTS: OFF + + ubuntu_20.04_static_cuda_11.4.3: + containerImage: ${{ variables.ubuntu_20_04_cuda_11_4_3_tag }} BUILD_SHARED_LIBS: OFF CMAKE_BUILD_TYPE: Release ENABLE_DRAY: ON @@ -448,8 +464,8 @@ stages: # static linking unit tests eats up alot of disk space, # so skip building tests in CI to keep us away from clif ENABLE_TESTS: OFF - ubuntu_18.04_static_cuda_11.4.0_no_mfem: - containerImage: ${{ variables.ubuntu_18_04_cuda_11_4_0_tag }} + ubuntu_20.04_static_cuda_11.4.3_no_mfem: + containerImage: ${{ variables.ubuntu_20_04_cuda_11_4_3_tag }} BUILD_SHARED_LIBS: OFF CMAKE_BUILD_TYPE: Release ENABLE_DRAY: ON @@ -597,7 +613,7 @@ stages: ${CMAKE_EXE} --version cat /ascent-config.cmake # configure - ${CMAKE_EXE} -S src -B build -C /ascent-config.cmake -DCMAKE_INSTALL_PREFIX=install + ${CMAKE_EXE} -S src -B build -C /ascent-config.cmake -DENABLE_TESTS=ON -DCMAKE_INSTALL_PREFIX=install displayName: 'Configure with CMake' - script: | diff --git a/package.py b/package.py index a43e0055a..5d35ad588 100755 --- a/package.py +++ b/package.py @@ -27,7 +27,7 @@ def create_package(output_file=None): suffix = "tar" t = datetime.datetime.now() output_file = "%s.%04d.%02d.%02d.%s" % (repo_name,t.year,t.month,t.day,suffix) - cmd = "python " + pkg_script + " --prefix=ascent " + output_file + cmd = "python3 " + pkg_script + " --prefix=ascent " + output_file print("[exe: {}]".format(cmd)) subprocess.call(cmd,shell=True) diff --git a/scripts/build_ascent/build_ascent.sh b/scripts/build_ascent/build_ascent.sh index 2fc8beb1d..e6adb00c5 100755 --- a/scripts/build_ascent/build_ascent.sh +++ b/scripts/build_ascent/build_ascent.sh @@ -44,6 +44,7 @@ build_camp="${build_camp:=true}" build_raja="${build_raja:=true}" build_umpire="${build_umpire:=true}" build_mfem="${build_mfem:=true}" +build_catalyst="${build_catalyst:=false}" # ascent options build_ascent="${build_ascent:=true}" @@ -51,6 +52,9 @@ build_ascent="${build_ascent:=true}" # see if we are building on windows build_windows="${build_windows:=OFF}" +# see if we are building on macOS +build_macos="${build_macos:=OFF}" + if [[ "$enable_cuda" == "ON" ]]; then echo "*** configuring with CUDA support" @@ -81,19 +85,23 @@ fi case "$OSTYPE" in win*) build_windows="ON";; msys*) build_windows="ON";; + darwin*) build_macos="ON";; *) ;; esac if [[ "$build_windows" == "ON" ]]; then echo "*** configuring for windows" -fi +fi + +if [[ "$build_macos" == "ON" ]]; then + echo "*** configuring for macos" +fi ################ -# path helper +# path helpers ################ function ospath() { - respath="" if [[ "$build_windows" == "ON" ]]; then echo `cygpath -m $1` else @@ -101,11 +109,20 @@ function ospath() fi } +function abs_path() +{ + if [[ "$build_macos" == "ON" ]]; then + echo "$(cd $(dirname "$1");pwd)/$(basename "$1")" + else + echo `realpath $1` + fi +} + root_dir=$(pwd) root_dir="${prefix:=${root_dir}}" root_dir=$(ospath ${root_dir}) -root_dir=$(realpath ${root_dir}) -script_dir=$(realpath "$(dirname "${BASH_SOURCE[0]}")") +root_dir=$(abs_path ${root_dir}) +script_dir=$(abs_path "$(dirname "${BASH_SOURCE[0]}")") # root_dir is where we will build and install # override with `prefix` env var @@ -141,7 +158,7 @@ fi ################ # Zlib ################ -zlib_version=1.2.13 +zlib_version=1.3 zlib_src_dir=$(ospath ${root_dir}/zlib-${zlib_version}) zlib_build_dir=$(ospath ${root_dir}/build/zlib-${zlib_version}/) zlib_install_dir=$(ospath ${root_dir}/install/zlib-${zlib_version}/) @@ -152,7 +169,7 @@ if [ ! -d ${zlib_install_dir} ]; then if ${build_zlib}; then if [ ! -d ${zlib_src_dir} ]; then echo "**** Downloading ${zlib_tarball}" - curl -L https://www.zlib.net/zlib-${zlib_version}.tar.gz -o ${zlib_tarball} + curl -L https://github.com/madler/zlib/releases/download/v${zlib_version}/zlib-${zlib_version}.tar.gz -o ${zlib_tarball} tar -xzf ${zlib_tarball} fi @@ -176,8 +193,10 @@ fi # build_zlib ################ # HDF5 ################ -hdf5_version=1.12.2 -hdf5_short_version=1.12 +# release 1-2 GAH! +hdf5_version=1.14.1-2 +hdf5_middle_version=1.14.1 +hdf5_short_version=1.14 hdf5_src_dir=$(ospath ${root_dir}/hdf5-${hdf5_version}) hdf5_build_dir=$(ospath ${root_dir}/build/hdf5-${hdf5_version}/) hdf5_install_dir=$(ospath ${root_dir}/install/hdf5-${hdf5_version}/) @@ -188,26 +207,25 @@ if [ ! -d ${hdf5_install_dir} ]; then if ${build_hdf5}; then if [ ! -d ${hdf5_src_dir} ]; then echo "**** Downloading ${hdf5_tarball}" - curl -L https://support.hdfgroup.org/ftp/HDF5/releases/hdf5-${hdf5_short_version}/hdf5-${hdf5_version}/src/hdf5-${hdf5_version}.tar.gz -o ${hdf5_tarball} + curl -L https://support.hdfgroup.org/ftp/HDF5/releases/hdf5-${hdf5_short_version}/hdf5-${hdf5_middle_version}/src/hdf5-${hdf5_version}.tar.gz -o ${hdf5_tarball} tar -xzf ${hdf5_tarball} fi -# hdf5 needs the actual zlib lib, just the install dir -- sort all of this out -# Note: always use static b/c paths aren't plumbed for windows dlls yet -if [[ "$build_windows" == "ON" ]]; then - zlib_lib_file=${zlib_install_dir}/lib/zlibstatic.lib -else - zlib_lib_file=${zlib_install_dir}/lib/zlib.a -fi - +################# +# +# hdf5 1.14.x CMake recipe for using zlib +# +# -DHDF5_ENABLE_Z_LIB_SUPPORT=ON +# Add zlib install dir to CMAKE_PREFIX_PATH +# +################# echo "**** Configuring HDF5 ${hdf5_version}" cmake -S ${hdf5_src_dir} -B ${hdf5_build_dir} ${cmake_compiler_settings} \ -DCMAKE_VERBOSE_MAKEFILE:BOOL=${enable_verbose} \ -DCMAKE_BUILD_TYPE=${build_config} \ - -DZLIB_INCLUDE_DIR:PATH=${zlib_install_dir}/include \ - -DZLIB_LIBRARY_DIR:FILEPATH=${zlib_lib_file} \ - -DZLIB_USE_EXTERNAL=1 \ + -DHDF5_ENABLE_Z_LIB_SUPPORT=ON \ + -DCMAKE_PREFIX_PATH=${zlib_install_dir} \ -DCMAKE_INSTALL_PREFIX=${hdf5_install_dir} echo "**** Building HDF5 ${hdf5_version}" @@ -224,7 +242,7 @@ fi # build_hdf5 ################ # Conduit ################ -conduit_version=v0.8.7 +conduit_version=v0.8.8 conduit_src_dir=$(ospath ${root_dir}/conduit-${conduit_version}/src) conduit_build_dir=$(ospath ${root_dir}/build/conduit-${conduit_version}/) conduit_install_dir=$(ospath ${root_dir}/install/conduit-${conduit_version}/) @@ -434,6 +452,7 @@ raja_src_dir=$(ospath ${root_dir}/RAJA-${raja_version}) raja_build_dir=$(ospath ${root_dir}/build/raja-${raja_version}) raja_install_dir=$(ospath ${root_dir}/install/raja-${raja_version}/) raja_tarball=RAJA-${raja_version}.tar.gz +raja_enable_vectorization="${raja_enable_vectorization:=ON}" # build only if install doesn't exist if [ ! -d ${raja_install_dir} ]; then @@ -471,7 +490,8 @@ cmake -S ${raja_src_dir} -B ${raja_build_dir} ${cmake_compiler_settings} \ -DRAJA_ENABLE_TESTS=${enable_tests} \ -DENABLE_EXAMPLES=${enable_tests} \ -DENABLE_EXERCISES=${enable_tests} ${raja_extra_cmake_args} \ - -DCMAKE_INSTALL_PREFIX=${raja_install_dir} + -DCMAKE_INSTALL_PREFIX=${raja_install_dir} \ + -DRAJA_ENABLE_VECTORIZATION=${raja_enable_vectorization} echo "**** Building RAJA ${raja_version}" cmake --build ${raja_build_dir} --config ${build_config} -j${build_jobs} @@ -577,7 +597,7 @@ cmake -S ${mfem_src_dir} -B ${mfem_build_dir} ${cmake_compiler_settings} \ -DMFEM_ENABLE_EXAMPLES=${enable_tests} \ -DCMAKE_INSTALL_PREFIX=${mfem_install_dir} -echo "**** Building MFEM ${vtkm_version}" +echo "**** Building MFEM ${mfem_version}" cmake --build ${mfem_build_dir} --config ${build_config} -j${build_jobs} echo "**** Installing MFEM ${mfem_version}" cmake --install ${mfem_build_dir} --config ${build_config} @@ -587,6 +607,42 @@ else echo "**** Skipping MFEM build, install found at: ${mfem_install_dir}" fi # build_mfem +################ +# Catalyst +################ +catalyst_version=2.0.0-rc3 +catalyst_src_dir=$(ospath ${root_dir}/catalyst-v${catalyst_version}) +catalyst_build_dir=$(ospath ${root_dir}/build/catalyst-v${catalyst_version}) +catalyst_install_dir=$(ospath ${root_dir}/install/catalyst-v${catalyst_version}/) +catalyst_cmake_dir=${catalyst_install_dir}lib64/cmake/catalyst-2.0/ +catalyst_tarball=catalyst-v${catalyst_version}.tar.gz + +# build only if install doesn't exist +if [ ! -d ${catalyst_install_dir} ]; then +if ${build_catalyst}; then +if [ ! -d ${catalyst_src_dir} ]; then + echo "**** Downloading ${catalyst_tarball}" + curl -L https://gitlab.kitware.com/paraview/catalyst/-/archive/v${catalyst_version}/catalyst-v${catalyst_version}.tar.gz -o ${catalyst_tarball} + tar -xzf ${catalyst_tarball} +fi + +echo "**** Configuring Catalyst ${catalyst_version}" +cmake -S ${catalyst_src_dir} -B ${catalyst_build_dir} ${cmake_compiler_settings} \ + -DCMAKE_VERBOSE_MAKEFILE:BOOL=${enable_verbose}\ + -DCMAKE_BUILD_TYPE=${build_config} \ + -DCATALYST_BUILD_TESTING=${enable_tests} \ + -DCATALYST_USE_MPI=${enable_mpi} \ + -DCMAKE_INSTALL_PREFIX=${catalyst_install_dir} \ + +echo "**** Building Catalyst ${catalyst_version}" +cmake --build ${catalyst_build_dir} --config ${build_config} -j${build_jobs} +echo "**** Installing Catalyst ${catalyst_version}" +cmake --install ${catalyst_build_dir} --config ${build_config} + +fi +else + echo "**** Skipping Catalyst build, install found at: ${catalyst_install_dir}" +fi # build_catalyst ################ # Ascent @@ -633,6 +689,10 @@ echo 'set(ENABLE_VTKH ON CACHE BOOL "")' >> ${root_dir}/ascent-config.cmake echo 'set(ENABLE_APCOMP ON CACHE BOOL "")' >> ${root_dir}/ascent-config.cmake echo 'set(ENABLE_DRAY ON CACHE BOOL "")' >> ${root_dir}/ascent-config.cmake +if ${build_catalyst}; then + echo 'set(CATALYST_DIR ' ${catalyst_cmake_dir} ' CACHE PATH "")' >> ${root_dir}/ascent-config.cmake +fi + if [[ "$enable_cuda" == "ON" ]]; then echo 'set(ENABLE_CUDA ON CACHE BOOL "")' >> ${root_dir}/ascent-config.cmake echo 'set(CMAKE_CUDA_ARCHITECTURES ' ${CUDA_ARCH} ' CACHE PATH "")' >> ${root_dir}/ascent-config.cmake @@ -662,10 +722,11 @@ cmake --build ${ascent_build_dir} --config ${build_config} -j${build_jobs} echo "**** Installing Ascent" cmake --install ${ascent_build_dir} --config ${build_config} +if ${build_catalyst}; then + mv ${ascent_install_dir}/lib/libcatalyst-ascent.so ${catalyst_install_dir}lib64/catalyst/libcatalyst-ascent.so +fi + fi else echo "**** Skipping Ascent build, install found at: ${ascent_install_dir}" fi # build_ascent - - - diff --git a/scripts/build_ascent/build_ascent_cuda_perlmutter.sh b/scripts/build_ascent/build_ascent_cuda_perlmutter.sh old mode 100644 new mode 100755 diff --git a/scripts/build_ascent/build_ascent_cuda_polaris.sh b/scripts/build_ascent/build_ascent_cuda_polaris.sh new file mode 100755 index 000000000..0cb453052 --- /dev/null +++ b/scripts/build_ascent/build_ascent_cuda_polaris.sh @@ -0,0 +1,11 @@ +module load cmake + +# Swap NVHPC with GNU compilers +module swap PrgEnv-nvhpc PrgEnv-gnu +module load cudatoolkit-standalone + +export CC=$(which cc) +export CXX=$(which CC) +export FTN=$(which ftn) + +env enable_mpi=ON enable_fortran=ON raja_enable_vectorization=OFF ./build_ascent_cuda.sh diff --git a/scripts/build_ascent/build_ascent_hip_crusher.sh b/scripts/build_ascent/build_ascent_hip_crusher.sh index be9a44c57..62bf0fb14 100755 --- a/scripts/build_ascent/build_ascent_hip_crusher.sh +++ b/scripts/build_ascent/build_ascent_hip_crusher.sh @@ -1,6 +1,7 @@ module load cmake/3.23.2 module load craype-accel-amd-gfx90a module load rocm/5.2.0 +module load cce/15.0.1 module load cray-mpich/8.1.16 export MPICH_GPU_SUPPORT_ENABLED=1 diff --git a/scripts/build_ascent/build_ascent_hip_frontier.sh b/scripts/build_ascent/build_ascent_hip_frontier.sh index bef54b716..b1c48a2ae 100755 --- a/scripts/build_ascent/build_ascent_hip_frontier.sh +++ b/scripts/build_ascent/build_ascent_hip_frontier.sh @@ -1,9 +1,9 @@ -module load cmake/3.23.2 +module load cmake #3.23.2 module load PrgEnv-cray -module load cce/14.0.2 module load craype-accel-amd-gfx90a -module load rocm/5.2.0 +module load rocm/5.2.0 #wait for 5.5 module load cray-mpich/8.1.23 +module load cce/15.0.1 export MPICH_GPU_SUPPORT_ENABLED=1 export ROCM_ARCH=gfx90a diff --git a/scripts/ci/docker/alpinedav_ubuntu_22.04_cuda_11.8.0_devel/Dockerfile b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_11.4.3_devel/Dockerfile similarity index 96% rename from scripts/ci/docker/alpinedav_ubuntu_22.04_cuda_11.8.0_devel/Dockerfile rename to scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_11.4.3_devel/Dockerfile index 3baa64fb0..9f47abf25 100644 --- a/scripts/ci/docker/alpinedav_ubuntu_22.04_cuda_11.8.0_devel/Dockerfile +++ b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_11.4.3_devel/Dockerfile @@ -2,7 +2,7 @@ # Project developers. See top-level LICENSE AND COPYRIGHT files for dates and # other details. No copyright assignment is required to contribute to Ascent. -FROM nvidia/cuda:11.8.0-devel-ubuntu22.04 +FROM nvidia/cuda:11.4.3-devel-ubuntu20.04 # add sudo to base cuda devel env # so we can install additional packages as diff --git a/scripts/ci/docker/alpinedav_ubuntu_22.04_cuda_11.8.0_devel/build.sh b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_11.4.3_devel/build.sh similarity index 77% rename from scripts/ci/docker/alpinedav_ubuntu_22.04_cuda_11.8.0_devel/build.sh rename to scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_11.4.3_devel/build.sh index 77a3a26ed..93c2bcafa 100644 --- a/scripts/ci/docker/alpinedav_ubuntu_22.04_cuda_11.8.0_devel/build.sh +++ b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_11.4.3_devel/build.sh @@ -4,7 +4,8 @@ # other details. No copyright assignment is required to contribute to Ascent. set -ev -export TAG_NAME=alpinedav/ascent-ci:ubuntu-22.04-cuda-11.8.0-devel +export TAG_ARCH=`uname -m` +export TAG_NAME=alpinedav/ascent-devel:ubuntu-20.04-cuda-11.4.3-${TAG_ARCH} # exec docker build to create image echo "docker build -t ${TAG_NAME} ." diff --git a/scripts/ci/docker/_alpinedav_ubuntu_22.04_cuda_11.8.0_devel_tpls/Dockerfile b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_11.4.3_devel_tpls/Dockerfile similarity index 86% rename from scripts/ci/docker/_alpinedav_ubuntu_22.04_cuda_11.8.0_devel_tpls/Dockerfile rename to scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_11.4.3_devel_tpls/Dockerfile index 6794ba710..f6dce518e 100644 --- a/scripts/ci/docker/_alpinedav_ubuntu_22.04_cuda_11.8.0_devel_tpls/Dockerfile +++ b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_11.4.3_devel_tpls/Dockerfile @@ -2,7 +2,8 @@ # Project developers. See top-level LICENSE AND COPYRIGHT files for dates and # other details. No copyright assignment is required to contribute to Ascent. -FROM alpinedav/ascent-ci:ubuntu-22.04-cuda-11.8.0-devel +ARG ARCH_TAG="x86_64" +FROM alpinedav/ascent-devel:ubuntu-20.04-cuda-11.4.3-${ARCH_TAG} # obtain a copy of ascent source from host env, # which we use to call uberenv diff --git a/scripts/ci/docker/alpinedav_ubuntu_18.04_cuda_11.4.0_devel_tpls/build.sh b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_11.4.3_devel_tpls/build.sh similarity index 55% rename from scripts/ci/docker/alpinedav_ubuntu_18.04_cuda_11.4.0_devel_tpls/build.sh rename to scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_11.4.3_devel_tpls/build.sh index f668de35c..23edc9206 100644 --- a/scripts/ci/docker/alpinedav_ubuntu_18.04_cuda_11.4.0_devel_tpls/build.sh +++ b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_11.4.3_devel_tpls/build.sh @@ -4,10 +4,12 @@ # other details. No copyright assignment is required to contribute to Ascent. set -ev -export TAG_BASE=alpinedav/ascent-ci:ubuntu-18.04-cuda-11.4.0-devel-tpls +export REPO_NAME="ascent" +export TAG_ARCH=`uname -m` +export TAG_BASE=alpinedav/ascent-devel:ubuntu-20.04-cuda-11.4.3-${TAG_ARCH}-tpls date -python ../build_and_tag.py ${TAG_BASE} +python3 ../../../docker_build_and_tag.py ${REPO_NAME} ${TAG_ARCH} ${TAG_BASE} date diff --git a/scripts/ci/docker/_alpinedav_ubuntu_22.04_cuda_11.8.0_devel_tpls/docker_env_setup.sh b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_11.4.3_devel_tpls/docker_env_setup.sh similarity index 100% rename from scripts/ci/docker/_alpinedav_ubuntu_22.04_cuda_11.8.0_devel_tpls/docker_env_setup.sh rename to scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_11.4.3_devel_tpls/docker_env_setup.sh diff --git a/scripts/ci/docker/_alpinedav_ubuntu_22.04_cuda_11.8.0_devel_tpls/docker_uberenv_build.sh b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_11.4.3_devel_tpls/docker_uberenv_build.sh similarity index 94% rename from scripts/ci/docker/_alpinedav_ubuntu_22.04_cuda_11.8.0_devel_tpls/docker_uberenv_build.sh rename to scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_11.4.3_devel_tpls/docker_uberenv_build.sh index 3f7d09fcd..5a18cb9be 100644 --- a/scripts/ci/docker/_alpinedav_ubuntu_22.04_cuda_11.8.0_devel_tpls/docker_uberenv_build.sh +++ b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_11.4.3_devel_tpls/docker_uberenv_build.sh @@ -10,7 +10,7 @@ export SPACK_SPEC="${SPACK_SPEC} ^raja+cuda~openmp cuda_arch=70 ^umpire+cuda~ope # config export SPACK_CONFIG="scripts/uberenv_configs/spack_configs/configs/alpinedav/ubuntu_22.04_cuda_11.8.0_devel/" -cd ascent && python scripts/uberenv/uberenv.py \ +cd ascent && python3 scripts/uberenv/uberenv.py \ -k \ --spec="${SPACK_SPEC}" \ --spack-config-dir="${SPACK_CONFIG}" \ diff --git a/scripts/ci/docker/alpinedav_ubuntu_18.04_cuda_11.4.0_devel/Dockerfile b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_12.1.1_devel/Dockerfile similarity index 75% rename from scripts/ci/docker/alpinedav_ubuntu_18.04_cuda_11.4.0_devel/Dockerfile rename to scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_12.1.1_devel/Dockerfile index 71913b444..671cbbfae 100644 --- a/scripts/ci/docker/alpinedav_ubuntu_18.04_cuda_11.4.0_devel/Dockerfile +++ b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_12.1.1_devel/Dockerfile @@ -2,7 +2,8 @@ # Project developers. See top-level LICENSE AND COPYRIGHT files for dates and # other details. No copyright assignment is required to contribute to Ascent. -FROM nvidia/cuda:11.4.0-devel-ubuntu18.04 +FROM nvidia/cuda:12.1.1-devel-ubuntu20.04 + # add sudo to base cuda devel env # so we can install additional packages as # non-root, but admin default user on azure pipelines @@ -13,8 +14,18 @@ RUN DEBIAN_FRONTEND="noninteractive" apt-get -y install tzdata RUN apt-get update && apt-get -y install \ git \ git-lfs \ - python \ gfortran \ + python3 \ + python3-dev \ + python-is-python3 \ + perl \ + git \ + git-lfs \ + curl \ + wget \ + tar \ + unzip \ + file \ zlib1g-dev \ curl \ mpich \ @@ -22,8 +33,6 @@ RUN apt-get update && apt-get -y install \ libblas-dev \ liblapack-dev \ liblapacke-dev \ - libcublas10 \ - libcublas-dev \ unzip \ openssh-server \ vim diff --git a/scripts/ci/docker/alpinedav_ubuntu_18.04_cuda_11.4.0_devel/build.sh b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_12.1.1_devel/build.sh similarity index 77% rename from scripts/ci/docker/alpinedav_ubuntu_18.04_cuda_11.4.0_devel/build.sh rename to scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_12.1.1_devel/build.sh index 79fd1a6e8..7db80b1ef 100644 --- a/scripts/ci/docker/alpinedav_ubuntu_18.04_cuda_11.4.0_devel/build.sh +++ b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_12.1.1_devel/build.sh @@ -4,7 +4,8 @@ # other details. No copyright assignment is required to contribute to Ascent. set -ev -export TAG_NAME=alpinedav/ascent-ci:ubuntu-18.04-cuda-11.4.0-devel +export TAG_ARCH=`uname -m` +export TAG_NAME=alpinedav/ascent-devel:ubuntu-20.04-cuda-12.1.1-${TAG_ARCH} # exec docker build to create image echo "docker build -t ${TAG_NAME} ." diff --git a/scripts/ci/docker/alpinedav_ubuntu_18.04_cuda_11.4.0_devel_tpls/Dockerfile b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_12.1.1_devel_tpls/Dockerfile similarity index 86% rename from scripts/ci/docker/alpinedav_ubuntu_18.04_cuda_11.4.0_devel_tpls/Dockerfile rename to scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_12.1.1_devel_tpls/Dockerfile index 3d2600a3c..4808161f1 100644 --- a/scripts/ci/docker/alpinedav_ubuntu_18.04_cuda_11.4.0_devel_tpls/Dockerfile +++ b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_12.1.1_devel_tpls/Dockerfile @@ -2,7 +2,8 @@ # Project developers. See top-level LICENSE AND COPYRIGHT files for dates and # other details. No copyright assignment is required to contribute to Ascent. -FROM alpinedav/ascent-ci:ubuntu-18.04-cuda-11.4.0-devel +ARG ARCH_TAG="x86_64" +FROM alpinedav/ascent-devel:ubuntu-20.04-cuda-12.1.1-${ARCH_TAG} # obtain a copy of ascent source from host env, # which we use to call uberenv diff --git a/scripts/ci/docker/_alpinedav_ubuntu_22.04_cuda_11.8.0_devel_tpls/build.sh b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_12.1.1_devel_tpls/build.sh similarity index 55% rename from scripts/ci/docker/_alpinedav_ubuntu_22.04_cuda_11.8.0_devel_tpls/build.sh rename to scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_12.1.1_devel_tpls/build.sh index db28aec36..952107e76 100644 --- a/scripts/ci/docker/_alpinedav_ubuntu_22.04_cuda_11.8.0_devel_tpls/build.sh +++ b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_12.1.1_devel_tpls/build.sh @@ -4,10 +4,12 @@ # other details. No copyright assignment is required to contribute to Ascent. set -ev -export TAG_BASE=alpinedav/ascent-ci:ubuntu-22.04-cuda-11.8.0-devel-tpls +export REPO_NAME="ascent" +export TAG_ARCH=`uname -m` +export TAG_BASE=alpinedav/ascent-devel:ubuntu-20.04-cuda-12.1.1-${TAG_ARCH}-tpls date -python ../build_and_tag.py ${TAG_BASE} +python3 ../../../docker_build_and_tag.py ${REPO_NAME} ${TAG_ARCH} ${TAG_BASE} date diff --git a/scripts/ci/docker/alpinedav_ubuntu_18.04_cuda_11.4.0_devel_tpls/docker_env_setup.sh b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_12.1.1_devel_tpls/docker_env_setup.sh similarity index 100% rename from scripts/ci/docker/alpinedav_ubuntu_18.04_cuda_11.4.0_devel_tpls/docker_env_setup.sh rename to scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_12.1.1_devel_tpls/docker_env_setup.sh diff --git a/scripts/ci/docker/alpinedav_ubuntu_18.04_cuda_11.4.0_devel_tpls/docker_uberenv_build.sh b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_12.1.1_devel_tpls/docker_uberenv_build.sh old mode 100755 new mode 100644 similarity index 89% rename from scripts/ci/docker/alpinedav_ubuntu_18.04_cuda_11.4.0_devel_tpls/docker_uberenv_build.sh rename to scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_12.1.1_devel_tpls/docker_uberenv_build.sh index 2f05b2f63..5a18cb9be --- a/scripts/ci/docker/alpinedav_ubuntu_18.04_cuda_11.4.0_devel_tpls/docker_uberenv_build.sh +++ b/scripts/ci/docker/alpinedav_ubuntu_20.04_cuda_12.1.1_devel_tpls/docker_uberenv_build.sh @@ -8,9 +8,9 @@ export SPACK_SPEC="%gcc+mpi+cuda+vtkh+dray+mfem+occa~genten~python~openmp~shared # constraints export SPACK_SPEC="${SPACK_SPEC} ^raja+cuda~openmp cuda_arch=70 ^umpire+cuda~openmp cuda_arch=70 ^camp+cuda~openmp cuda_arch=70 ^hdf5~mpi ^mfem~cuda~petsc~sundials~slepc ^hypre~cuda ^vtk-m+cuda~kokkos cuda_arch=70" # config -export SPACK_CONFIG="scripts/uberenv_configs/spack_configs/configs/alpinedav/ubuntu_18.04_cuda_11.4.0_devel/" +export SPACK_CONFIG="scripts/uberenv_configs/spack_configs/configs/alpinedav/ubuntu_22.04_cuda_11.8.0_devel/" -cd ascent && python scripts/uberenv/uberenv.py \ +cd ascent && python3 scripts/uberenv/uberenv.py \ -k \ --spec="${SPACK_SPEC}" \ --spack-config-dir="${SPACK_CONFIG}" \ diff --git a/scripts/ci/docker/alpinedav_ubuntu_20.04_devel/build.sh b/scripts/ci/docker/alpinedav_ubuntu_20.04_devel/build.sh index a4a876260..267e29a56 100644 --- a/scripts/ci/docker/alpinedav_ubuntu_20.04_devel/build.sh +++ b/scripts/ci/docker/alpinedav_ubuntu_20.04_devel/build.sh @@ -4,7 +4,8 @@ # other details. No copyright assignment is required to contribute to Ascent. set -ev -export TAG_NAME=alpinedav/ascent-ci:ubuntu-20.04-devel +export TAG_ARCH=`uname -m` +export TAG_NAME=alpinedav/ascent-devel:ubuntu-20.04-${TAG_ARCH} # exec docker build to create image echo "docker build -t ${TAG_NAME} ." diff --git a/scripts/ci/docker/alpinedav_ubuntu_20.04_devel_tpls/Dockerfile b/scripts/ci/docker/alpinedav_ubuntu_20.04_devel_tpls/Dockerfile index a5bd6dbeb..6303ccef2 100644 --- a/scripts/ci/docker/alpinedav_ubuntu_20.04_devel_tpls/Dockerfile +++ b/scripts/ci/docker/alpinedav_ubuntu_20.04_devel_tpls/Dockerfile @@ -2,7 +2,8 @@ # Project developers. See top-level LICENSE AND COPYRIGHT files for dates and # other details. No copyright assignment is required to contribute to Ascent. -FROM alpinedav/ascent-ci:ubuntu-20.04-devel +ARG ARCH_TAG="x86_64" +FROM alpinedav/ascent-devel:ubuntu-20.04-${ARCH_TAG} # obtain a copy of ascent source from host env, # which we use to call uberenv diff --git a/scripts/ci/docker/alpinedav_ubuntu_20.04_devel_tpls/build.sh b/scripts/ci/docker/alpinedav_ubuntu_20.04_devel_tpls/build.sh index a5cfce236..b9c3e18d1 100644 --- a/scripts/ci/docker/alpinedav_ubuntu_20.04_devel_tpls/build.sh +++ b/scripts/ci/docker/alpinedav_ubuntu_20.04_devel_tpls/build.sh @@ -4,11 +4,12 @@ # other details. No copyright assignment is required to contribute to Ascent. set -ev -export TAG_BASE=alpinedav/ascent-ci:ubuntu-20.04-devel-tpls +export REPO_NAME="ascent" +export TAG_ARCH=`uname -m` +export TAG_BASE=alpinedav/ascent-devel:ubuntu-20.04-${TAG_ARCH}-tpls date -python ../build_and_tag.py ${TAG_BASE} +python3 ../../../docker_build_and_tag.py ${REPO_NAME} ${TAG_ARCH} ${TAG_BASE} date - diff --git a/scripts/ci/docker/alpinedav_ubuntu_20.04_devel_tpls/docker_uberenv_build.sh b/scripts/ci/docker/alpinedav_ubuntu_20.04_devel_tpls/docker_uberenv_build.sh index cafbda1b4..921c9b182 100755 --- a/scripts/ci/docker/alpinedav_ubuntu_20.04_devel_tpls/docker_uberenv_build.sh +++ b/scripts/ci/docker/alpinedav_ubuntu_20.04_devel_tpls/docker_uberenv_build.sh @@ -10,7 +10,7 @@ export SPACK_SPEC="${SPACK_SPEC}" # config export SPACK_CONFIG="scripts/uberenv_configs/spack_configs/configs/alpinedav/ubuntu_18.04_devel/" -cd ascent && python scripts/uberenv/uberenv.py \ +cd ascent && python3 scripts/uberenv/uberenv.py \ -k \ --spec="${SPACK_SPEC}" \ --spack-config-dir="${SPACK_CONFIG}" \ diff --git a/scripts/ci/docker/alpinedav_ubuntu_20.04_rocm_5.1.3_devel/build.sh b/scripts/ci/docker/alpinedav_ubuntu_20.04_rocm_5.1.3_devel/build.sh index ab437c074..c98af4c80 100755 --- a/scripts/ci/docker/alpinedav_ubuntu_20.04_rocm_5.1.3_devel/build.sh +++ b/scripts/ci/docker/alpinedav_ubuntu_20.04_rocm_5.1.3_devel/build.sh @@ -4,7 +4,8 @@ # other details. No copyright assignment is required to contribute to Ascent. set -ev -export TAG_NAME=alpinedav/ascent-ci:ubuntu-20.04-rocm-5.1.3-devel +export TAG_ARCH=`uname -m` +export TAG_NAME=alpinedav/ascent-devel:ubuntu-20.04-rocm-5.1.3-${TAG_ARCH} # exec docker build to create image echo "docker build -t ${TAG_NAME} ." diff --git a/scripts/ci/docker/alpinedav_ubuntu_20.04_rocm_5.1.3_devel_tpls/Dockerfile b/scripts/ci/docker/alpinedav_ubuntu_20.04_rocm_5.1.3_devel_tpls/Dockerfile index 7195a42d5..b111feec1 100644 --- a/scripts/ci/docker/alpinedav_ubuntu_20.04_rocm_5.1.3_devel_tpls/Dockerfile +++ b/scripts/ci/docker/alpinedav_ubuntu_20.04_rocm_5.1.3_devel_tpls/Dockerfile @@ -2,7 +2,8 @@ # Project developers. See top-level LICENSE AND COPYRIGHT files for dates and # other details. No copyright assignment is required to contribute to Ascent. -FROM alpinedav/ascent-ci:ubuntu-20.04-rocm-5.1.3-devel +ARG ARCH_TAG="x86_64" +FROM alpinedav/ascent-devel:ubuntu-20.04-rocm-5.1.3-${ARCH_TAG} # obtain a copy of ascent source from host env, # which we use to call uberenv diff --git a/scripts/ci/docker/alpinedav_ubuntu_20.04_rocm_5.1.3_devel_tpls/build.sh b/scripts/ci/docker/alpinedav_ubuntu_20.04_rocm_5.1.3_devel_tpls/build.sh index fc768f572..5d9c49024 100755 --- a/scripts/ci/docker/alpinedav_ubuntu_20.04_rocm_5.1.3_devel_tpls/build.sh +++ b/scripts/ci/docker/alpinedav_ubuntu_20.04_rocm_5.1.3_devel_tpls/build.sh @@ -4,10 +4,12 @@ # other details. No copyright assignment is required to contribute to Ascent. set -ev -export TAG_BASE=alpinedav/ascent-ci:ubuntu-20.04-rocm-5.1.3-devel-tpls +export REPO_NAME="ascent" +export TAG_ARCH=`uname -m` +export TAG_BASE=alpinedav/ascent-devel:ubuntu-20.04-rocm-5.1.3-${TAG_ARCH}-tpls date -python ../build_and_tag.py ${TAG_BASE} +python3 ../../../docker_build_and_tag.py ${REPO_NAME} ${TAG_ARCH} ${TAG_BASE} date diff --git a/scripts/ci/docker/alpinedav_ubuntu_20.04_rocm_5.1.3_devel_tpls/docker_uberenv_build.sh b/scripts/ci/docker/alpinedav_ubuntu_20.04_rocm_5.1.3_devel_tpls/docker_uberenv_build.sh index 4fa3536f1..8da2723af 100755 --- a/scripts/ci/docker/alpinedav_ubuntu_20.04_rocm_5.1.3_devel_tpls/docker_uberenv_build.sh +++ b/scripts/ci/docker/alpinedav_ubuntu_20.04_rocm_5.1.3_devel_tpls/docker_uberenv_build.sh @@ -13,7 +13,8 @@ export PATH=$PATH:/${cmake_install_dir}/bin/ # build rocm tpls with helper script chmod +x ascent/scripts/build_ascent/build_ascent.sh -env build_ascent=false enable_hip=true ascent/scripts/build_ascent/build_ascent.sh +# enable tests is of b/c one of the vtk-m tests fails to link +env enable_tests=OFF build_ascent=false enable_hip=ON ascent/scripts/build_ascent/build_ascent.sh ############################ # TODO: get spack working diff --git a/scripts/ci/docker/alpinedav_ubuntu_22.04_devel/build.sh b/scripts/ci/docker/alpinedav_ubuntu_22.04_devel/build.sh old mode 100644 new mode 100755 index 54bfb28ee..e981b9359 --- a/scripts/ci/docker/alpinedav_ubuntu_22.04_devel/build.sh +++ b/scripts/ci/docker/alpinedav_ubuntu_22.04_devel/build.sh @@ -4,7 +4,8 @@ # other details. No copyright assignment is required to contribute to Ascent. set -ev -export TAG_NAME=alpinedav/ascent-ci:ubuntu-22.04-devel +export TAG_ARCH=`uname -m` +export TAG_NAME=alpinedav/ascent-devel:ubuntu-22.04-${TAG_ARCH} # exec docker build to create image echo "docker build -t ${TAG_NAME} ." diff --git a/scripts/ci/docker/alpinedav_ubuntu_22.04_devel_tpls/Dockerfile b/scripts/ci/docker/alpinedav_ubuntu_22.04_devel_tpls/Dockerfile index b5f63518a..faa975263 100644 --- a/scripts/ci/docker/alpinedav_ubuntu_22.04_devel_tpls/Dockerfile +++ b/scripts/ci/docker/alpinedav_ubuntu_22.04_devel_tpls/Dockerfile @@ -2,7 +2,8 @@ # Project developers. See top-level LICENSE AND COPYRIGHT files for dates and # other details. No copyright assignment is required to contribute to Ascent. -FROM alpinedav/ascent-ci:ubuntu-22.04-devel +ARG TAG_ARCH=x86_64 +FROM alpinedav/ascent-devel:ubuntu-22.04-${TAG_ARCH} # obtain a copy of ascent source from host env, # which we use to call uberenv diff --git a/scripts/ci/docker/alpinedav_ubuntu_22.04_devel_tpls/build.sh b/scripts/ci/docker/alpinedav_ubuntu_22.04_devel_tpls/build.sh old mode 100644 new mode 100755 index a601090ef..89314f14c --- a/scripts/ci/docker/alpinedav_ubuntu_22.04_devel_tpls/build.sh +++ b/scripts/ci/docker/alpinedav_ubuntu_22.04_devel_tpls/build.sh @@ -4,11 +4,13 @@ # other details. No copyright assignment is required to contribute to Ascent. set -ev -export TAG_BASE=alpinedav/ascent-ci:ubuntu-22.04-devel-tpls +export REPO_NAME="ascent" +export TAG_ARCH=`uname -m` +export TAG_BASE=alpinedav/ascent-devel:ubuntu-22.04-${TAG_ARCH}-tpls date -python ../build_and_tag.py ${TAG_BASE} +python3 ../../../docker_build_and_tag.py ${REPO_NAME} ${TAG_ARCH} ${TAG_BASE} date diff --git a/scripts/ci/docker/alpinedav_ubuntu_22.04_devel_tpls/docker_uberenv_build.sh b/scripts/ci/docker/alpinedav_ubuntu_22.04_devel_tpls/docker_uberenv_build.sh index cafbda1b4..921c9b182 100644 --- a/scripts/ci/docker/alpinedav_ubuntu_22.04_devel_tpls/docker_uberenv_build.sh +++ b/scripts/ci/docker/alpinedav_ubuntu_22.04_devel_tpls/docker_uberenv_build.sh @@ -10,7 +10,7 @@ export SPACK_SPEC="${SPACK_SPEC}" # config export SPACK_CONFIG="scripts/uberenv_configs/spack_configs/configs/alpinedav/ubuntu_18.04_devel/" -cd ascent && python scripts/uberenv/uberenv.py \ +cd ascent && python3 scripts/uberenv/uberenv.py \ -k \ --spec="${SPACK_SPEC}" \ --spack-config-dir="${SPACK_CONFIG}" \ diff --git a/scripts/ci/docker/build_all_base.sh b/scripts/ci/docker/build_all_base.sh index ae64606a0..38359f89d 100644 --- a/scripts/ci/docker/build_all_base.sh +++ b/scripts/ci/docker/build_all_base.sh @@ -15,16 +15,24 @@ cd alpinedav_ubuntu_20.04_devel cd .. # ubuntu 22.04 -echo "[ubuntu 21.04 base]" +echo "[ubuntu 22.04 base]" cd alpinedav_ubuntu_22.04_devel ./build.sh cd .. # -# ubuntu 18.04 cuda 11.4.0 +# ubuntu 20.04 cuda 11.4.3 # -echo "[ubuntu 18.04 cuda 11.4.0 base]" -cd alpinedav_ubuntu_18.04_cuda_11.4.0_devel +echo "[ubuntu 20.04 cuda 11.4.3 base]" +cd alpinedav_ubuntu_20.04_cuda_11.4.3_devel +./build.sh +cd .. + +# +# ubuntu 20.04 cuda 12.1.1 +# +echo "[ubuntu 20.04 cuda 12.1.1 base]" +cd alpinedav_ubuntu_20.04_cuda_12.1.1_devel ./build.sh cd .. diff --git a/scripts/ci/docker/build_all_tpls.sh b/scripts/ci/docker/build_all_tpls.sh index a243b8d29..ce2cc715e 100644 --- a/scripts/ci/docker/build_all_tpls.sh +++ b/scripts/ci/docker/build_all_tpls.sh @@ -20,9 +20,15 @@ cd alpinedav_ubuntu_22.04_devel_tpls ./build.sh cd .. -# ubuntu 28.04 cuda 11.4.0 tpls -echo "[ubuntu 18.04 cuda 11.4.0 tpls]" -cd alpinedav_ubuntu_18.04_cuda_11.4.0_devel_tpls +# ubuntu 20.04 cuda 11.4.3 tpls +echo "[ubuntu 20.04 cuda 11.4.3 tpls]" +cd alpinedav_ubuntu_20.04_cuda_11.4.3_devel_tpls +./build.sh +cd .. + +# ubuntu 20.04 cuda 12.1.1 tpls +echo "[ubuntu 20.04 cuda 12.1.1 tpls]" +cd alpinedav_ubuntu_20.04_cuda_12.1.1_devel_tpls ./build.sh cd .. diff --git a/scripts/ci/docker/build_and_tag.py b/scripts/docker_build_and_tag.py similarity index 65% rename from scripts/ci/docker/build_and_tag.py rename to scripts/docker_build_and_tag.py index 6ea76d431..7e257517b 100755 --- a/scripts/ci/docker/build_and_tag.py +++ b/scripts/docker_build_and_tag.py @@ -11,6 +11,7 @@ import subprocess import shutil import datetime +import platform from os.path import join as pjoin @@ -38,10 +39,10 @@ def sexe(cmd,ret_output=False,echo = True): if ret_output: p = subprocess.Popen(cmd, shell=True, + universal_newlines=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT) res = p.communicate()[0] - res = res.decode('utf8') return p.returncode,res else: return subprocess.call(cmd,shell=True) @@ -67,34 +68,46 @@ def gen_docker_tag(): def main(): # get tag-base - if len(sys.argv) < 2: - print("usage: build_and_tag.py {tag_base} ") + if len(sys.argv) < 4: + print("usage: docker_build_and_tag.py {repo_name} {tag_arch} {tag_base} ") sys.exit(-1) - tag_base = sys.argv[1] + repo_name = sys.argv[1] + tag_arch = sys.argv[2] + tag_base = sys.argv[3] extra_args = "" - if len(sys.argv) > 2: - extra_args = sys.argv[2] + if len(sys.argv) > 4: + extra_args = "".join(sys.argv[4:]) + + print("repo_name: {0}".format(repo_name)) + print("tag_arch: {0}".format(tag_arch)) + print("tag_base: {0}".format(tag_base)) + print("extra_args: {0}".format(extra_args)) # remove old source tarball if it exists - remove_if_exists("ascent.docker.src.tar.gz") + remove_if_exists("{0}.docker.src.tar.gz".format(repo_name)) # save current working dir so we can get back here orig_dir = os.path.abspath(os.getcwd()) - # get current copy of the ascent source - os.chdir("../../../../") + # move to git root dir to get current copy of git source + rcode, root_dir = sexe("git rev-parse --show-toplevel",ret_output=True) + root_dir = root_dir.strip() + print("[repo root dir: {0}]".format(root_dir)) + os.chdir(root_dir) - # get current copy of the ascent source - cmd ='python package.py {0}' - sexe(cmd.format(pjoin(orig_dir, "ascent.docker.src.tar.gz"))) + # get current copy of the source + cmd ='python3 package.py {0}' + sexe(cmd.format(pjoin(orig_dir, "{0}.docker.src.tar.gz".format(repo_name)))) # change back to orig working dir os.chdir(orig_dir) # exec docker build to create image # tag with date + git hash - sexe('docker build -t {0}_{1} . {2}'.format(tag_base, + sexe('docker build --build-arg "TAG_ARCH={0}" -t {1}_{2} . {3}'.format( + tag_arch, + tag_base, gen_docker_tag(), extra_args)) diff --git a/scripts/uberenv_configs/packages/conduit/package.py b/scripts/uberenv_configs/packages/conduit/package.py index a2d520e38..365947b97 100644 --- a/scripts/uberenv_configs/packages/conduit/package.py +++ b/scripts/uberenv_configs/packages/conduit/package.py @@ -43,6 +43,7 @@ class Conduit(CMakePackage): # is to bridge any spack dependencies that are still using the name master version("master", branch="develop", submodules=True) # note: 2021-05-05 latest tagged release is now preferred instead of develop + version("0.8.8", sha256="99811e9c464b6f841f52fcd47e982ae47cbb01cba334cff43eabe13eea58c0df") version("0.8.7", sha256="f3bf44d860783f4e0d61517c5e280c88144af37414569f4cf86e2d29b3ba5293") version("0.8.6", sha256="8ca5d37033143ed7181c7286dd25a3f6126ba0358889066f13a2b32f68fc647e") version("0.8.5", sha256="b4a6f269a81570a4597e2565927fd0ed2ac45da0a2500ce5a71c26f7c92c5483") diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt index 71342d1a4..10210874a 100644 --- a/src/CMakeLists.txt +++ b/src/CMakeLists.txt @@ -11,7 +11,7 @@ cmake_policy(SET CMP0048 NEW) # Ascent ################################ -project(ascent VERSION "0.9.1") +project(ascent VERSION "0.9.2") ################################ # Build Options @@ -46,7 +46,7 @@ option(DRAY_USE_DOUBLE_PRECISION "Build Devil Ray with double precision" OFF) # VTK-h Specific Options -option(VTKH_ENABLE_FILTER_CONTOUR_TREE "Build VTK-h contour tree support" OFF) +option(VTKH_ENABLE_FILTER_CONTOUR_TREE "Build VTK-h contour tree support" ON) # Cuda Specific Options option(ENABLE_CUDA_DEBUG_CPU_ONLY "Enable CUDA CPU debugging" OFF) diff --git a/src/cmake/thirdparty/SetupCatalyst.cmake b/src/cmake/thirdparty/SetupCatalyst.cmake index df2238ae7..0a2c53ce4 100644 --- a/src/cmake/thirdparty/SetupCatalyst.cmake +++ b/src/cmake/thirdparty/SetupCatalyst.cmake @@ -20,6 +20,6 @@ if(NOT Catalyst_DIR) MESSAGE(FATAL_ERROR "Failed to find CATALYST at CATALYST_DIR=${CATALYST_DIR}") endif() -find_package(Catalyst REQUIRED SDK) +find_package(Catalyst REQUIRED COMPONENTS SDK) set(CATALYST_FOUND TRUE) diff --git a/src/cmake/thirdparty/SetupConduit.cmake b/src/cmake/thirdparty/SetupConduit.cmake index 515bd558b..4908a4b72 100644 --- a/src/cmake/thirdparty/SetupConduit.cmake +++ b/src/cmake/thirdparty/SetupConduit.cmake @@ -146,7 +146,15 @@ endif() if(ASCENT_ENABLE_TESTS AND WIN32 AND BUILD_SHARED_LIBS) # if we are running tests with dlls, we need path to dlls list(APPEND ASCENT_TPL_DLL_PATHS ${CONDUIT_DIR}/bin) + + # zlib dll + if(CONDUIT_ZLIB_DIR) + list(APPEND ASCENT_TPL_DLL_PATHS ${CONDUIT_ZLIB_DIR}/bin/) + endif() + + # hdf5 dlls if(CONDUIT_HDF5_ENABLED) list(APPEND ASCENT_TPL_DLL_PATHS ${CONDUIT_HDF5_DIR}/bin) endif() -endif() \ No newline at end of file + +endif() diff --git a/src/cmake/thirdparty/SetupMFEM.cmake b/src/cmake/thirdparty/SetupMFEM.cmake index 797ef42a3..ad3b5fe4b 100644 --- a/src/cmake/thirdparty/SetupMFEM.cmake +++ b/src/cmake/thirdparty/SetupMFEM.cmake @@ -115,24 +115,6 @@ else() set(MFEM_CALIPER_ENABLED TRUE) endif() - -# next check for ZLIB_DIR -# (spack builds of mfem now depend on zlib, and that is not propgating) -# -# TODO: Decide if we want to be strict about this -# if(NOT ZLIB_DIR) -# MESSAGE(FATAL_ERROR "MFEM support needs explicit ZLIB_DIR") -# endif() -# - -if(ZLIB_DIR) - set(ZLIB_ROOT ${ZLIB_DIR}) - find_package(ZLIB REQUIRED) -endif() - -# -# Add ZLIB to the mfem_tpl_lnk_flags -# if(ZLIB_FOUND) list(APPEND mfem_tpl_lnk_flags ${ZLIB_LIBRARIES}) endif() diff --git a/src/docs/sphinx/Actions/Examples.rst b/src/docs/sphinx/Actions/Examples.rst index e0f199354..7ae1681f9 100644 --- a/src/docs/sphinx/Actions/Examples.rst +++ b/src/docs/sphinx/Actions/Examples.rst @@ -25,6 +25,8 @@ Resulting image: .. image:: examples/tout_render_3d_points_const_radius100.png +.. _screen_annotations_off: + An example of rendering with no screen annotations. ---------------------------------------------------- @@ -80,6 +82,8 @@ Resulting image: .. image:: examples/tout_vector_component100.png +.. _world_annotations_off: + An example of rendering with no world annotations. --------------------------------------------------- @@ -718,6 +722,17 @@ Resulting image: .. image:: examples/tout_gradient_mag_braid100.png +An example of data binning, binning spatially and summing a field. +------------------------------------------------------------------- + +YAML actions: + +.. literalinclude:: examples/tout_binning_filter_bins100.yaml + +Resulting image: + +.. image:: examples/tout_binning_filter_bins100.png + An example of using the log10 filter and clamping the min value. This can help when there are negative values present. ----------------------------------------------------------------------------------------------------------------------- diff --git a/src/docs/sphinx/Actions/Extracts.rst b/src/docs/sphinx/Actions/Extracts.rst index 8ba932ad2..3b6190d8c 100644 --- a/src/docs/sphinx/Actions/Extracts.rst +++ b/src/docs/sphinx/Actions/Extracts.rst @@ -10,14 +10,134 @@ Extracts ======== Extracts are an abstraction that enables the user to specify how they want to capture their data. In terms of Ascent, data capture sends data outside the Ascent infrastructure. -Examples include writing out the raw simulation data to the file system, creating HDF5 files, or sending the data off node (e.g., ADIOS). +Examples include writing out simulation data to the file system, storing data for in-memory use, or executing custom python scripts. + +.. , or sending the data off node (e.g., ADIOS). Currently supported extracts include: - * Python : use a python script with NumPy to analyze mesh data * Relay : leverages Conduit's Relay library to do parallel I/O - * HTG : write a VTK HTG (HyperTreeGrid) file - * ADIOS : use ADIOS to send data to a separate resource + * Conduit: stores mesh data as a Conduit in-memory tree, accessible via ``Ascent::info`` + * Python : uses a python script with NumPy to analyze mesh data + * HTG : writes a VTK HTG (HyperTreeGrid) file + + +.. * ADIOS : use ADIOS to send data to a separate resource + +.. _extracts_relay: + +Relay +----- +Relay extracts save data to the file system. Currently, Relay supports saving data to Blueprint HDF5, YAML, or JSON files. +By default, Relay saves the published mesh data to the file system, but if a pipeline is specified, then the result of the +pipeline is saved. Relay extracts can be opened by post-hoc tools such as VisIt. + +.. code-block:: c++ + + conduit::Node pipelines; + // pipeline 1 + pipelines["pl1/f1/type"] = "contour"; + // filter knobs + conduit::Node &contour_params = pipelines["pl1/f1/params"]; + contour_params["field"] = "radial_vert"; + contour_params["iso_values"] = 250.; + + conduit::Node extracts; + extracts["e1/type"] = "relay"; + extracts["e1/pipeline"] = "pl1"; + + extracts["e1/params/path"] = output_file; + +In this example, a contour of a field is saved to the file system in json form. +To save the files in HDF5 format: + +.. code-block:: c++ + + extracts["e1/params/protocol"] = "hdf5"; + +``yaml`` and ``json`` are also valid ``protocol`` options. + + +By default, the relay extract creates one file per mesh domain saved. You can control +the number of files written (aggregating multiple domains per file) using the +``num_files`` parameter: + +.. code-block:: c++ + + extracts["e1/params/num_files"] = 2; + + +Additionally, Relay supports saving out only a subset of the data. The ``fields`` parameters is a list of +strings that indicate which fields should be saved. + +.. code-block:: c++ + + extracts["e1/params/fields"].append("density"); + extracts["e1/params/fields"].append("pressure"); + +Relay HDF5 extracts use gzip to compress leaf data arrays to reduce I/O and file size. +Compression support is enabled when leaf arrays are greater than a heuristic size in bytes. +These thresholds are controlled via an optional parameter tree ``hdf5_options``. +The expected parameter tree mirrors Conduit Relay's controls for HDF5 features. + +Here is an example that lowers the compression threshold while writing an extract to 10,000 bytes: + +.. code-block:: c++ + + // compress any leaf array larger than 10,000 bytes + extracts["e1/params/hdf5_options/chunking/threshold"] = 10000-1; + // use 10,000 chunk size + extracts["e1/params/hdf5_options/chunking/chunk_size"] = 10000; + // use level 9 gzip + extracts["e1/params/hdf5_options/chunking/compression/level"] = 9; + + +Here is a yaml representation of the full default parameter tree: + +.. code-block:: yaml + + compact_storage: + enabled: "true" + threshold: 1024 + chunking: + enabled: "true" + threshold: 2000000 + chunk_size: 1000000 + compression: + method: "gzip" + level: 5 + + +.. _extracts_conduit: + +Conduit +--------- +Conduit extracts store mesh data as a Conduit in-memory tree which can be accessed after execution via the ``Ascent::info`` call. Enables in-memory access to Ascent pipeline results outside of Ascent. + +.. code-block:: c++ + + conduit::Node actions; + conduit::Node &add_extracts = actions.append(); + add_extracts["action"] = "add_extracts"; + conduit::Node &extracts = add_extracts["extracts"]; + // add the extract + extracts["e1/type"] = "conduit"; + + // + // Run Ascent + // + Ascent ascent; + ascent.open(); + ascent.publish(data); + ascent.execute(actions); + conduit::Node &info = ascent.info(); + + // access the mesh data + conduit::Node &my_mesh = info["extracts"][0]; + // ... + // process my_mesh or copy out before ascent.close() + // ... + ascent.close(); .. _extracts_python: @@ -106,56 +226,7 @@ In addition to performing custom python analysis, your can create new data sets through a new instance of Ascent. We call this technique Inception. -.. _extracts_relay: -Relay ------ -Relay extracts save data to the file system. Currently, Relay supports saving data to Blueprint HDF5, YAML, or JSON files. -By default, Relay saves the published mesh data to the file system, but if a pipeline is specified, then the result of the -pipeline is saved. Relay extracts can be opened by post-hoc tools such as VisIt. - -.. code-block:: c++ - - conduit::Node pipelines; - // pipeline 1 - pipelines["pl1/f1/type"] = "contour"; - // filter knobs - conduit::Node &contour_params = pipelines["pl1/f1/params"]; - contour_params["field"] = "radial_vert"; - contour_params["iso_values"] = 250.; - - conduit::Node extracts; - extracts["e1/type"] = "relay"; - extracts["e1/pipeline"] = "pl1"; - - extracts["e1/params/path"] = output_file; - -In this example, a contour of a field is saved to the file system in json form. -To save the files in HDF5 format: - -.. code-block:: c++ - - extracts["e1/params/protocol"] = "hdf5"; - -``yaml`` and ``json`` are also valid ``protocol`` options. - - -By default, the relay extract creates one file per mesh domain saved. You can control -the number of files written (aggregating multiple domains per file) using the -``num_files`` parameter: - -.. code-block:: c++ - - extracts["e1/params/num_files"] = 2; - - -Additionally, Relay supports saving out only a subset of the data. The ``fields`` parameters is a list of -strings that indicate which fields should be saved. - -.. code-block:: c++ - - extracts["e1/params/fields"].append("density"); - extracts["e1/params/fields"].append("pressure"); .. _extracts_htg: @@ -230,6 +301,6 @@ This extract generates two files: one for vertex data and one for element data. This extract requires a ``path`` for the location of the resulting files. Optional parameters include ``protocol`` for the type of output file (default is CSV), and ``fields``, which specifies the fields to be included in the files (default is all present fields). -ADIOS ------ -The current ADIOS extract is experimental and this section is under construction. +.. ADIOS +.. ----- +.. The current ADIOS extract is experimental and this section is under construction. diff --git a/src/docs/sphinx/Actions/Pipelines.rst b/src/docs/sphinx/Actions/Pipelines.rst index 20e255a0c..5955eb63b 100644 --- a/src/docs/sphinx/Actions/Pipelines.rst +++ b/src/docs/sphinx/Actions/Pipelines.rst @@ -753,6 +753,8 @@ accurate but slower point based gradients (default). params["output_name"] = "my_q"; // (required) name of the output field params["use_cell_gradient"] = "false"; // (optional) + + Partitioning ~~~~~~~~~~~~ Partitioning meshes is commonly needed in order to evenly distribute work @@ -1013,3 +1015,4 @@ integer values to limit the set of domains over which the selection will be appl type: field domain_id: any field: fieldname + diff --git a/src/docs/sphinx/Actions/Scenes.rst b/src/docs/sphinx/Actions/Scenes.rst index 705278f51..61466eb8f 100644 --- a/src/docs/sphinx/Actions/Scenes.rst +++ b/src/docs/sphinx/Actions/Scenes.rst @@ -395,7 +395,76 @@ parameters: - ``fg_color`` : an array of three floating point values that controls the foreground color. The foreground color is used to color annotations and mesh plot lines. - ``annotations`` : controls if annotations are rendered or not. Valid values are ``"true"`` and ``"false"``. - ``render_bg`` : controls if the background is rendered or not. If no background is rendered, the background will appear transparent. Valid values are ``"true"`` and ``"false"``. -- ``dataset_bounds`` : controls the dimensions of the rendered bounding box around the dataset. This will overwrite the default bounding box based on the dataset's dimensions. A valid value is an array of six doubles ([xMin,xMax,yMin,yMax,zMin,zMax]) that define dimensions larger than the default. +- ``dataset_bounds`` : controls the dimensions of the rendered bounding box around the dataset. This will overwrite the default bounding box based on the dataset's dimensions. A valid value is an array of six floats ([xMin,xMax,yMin,yMax,zMin,zMax]) that define dimensions larger than the default. Note: this does not control annotations. To turn off dataset annotations, see :ref:`world_annotations_off`. To turn off screen annotations, see :ref:`screen_annotations_off`. +- ``color_bar_position`` : controls the position of 1 or more color bars. A valid value for positioning a single color bar is an array of four floats ([xMin,xMax,yMin,yMax]). A valid value for positioning N color bars is an array of 4*N floats ([xMin1_0,xMax1_0,yMin1_0,yMax1_0,...,xMin_n,xMax_n,yMin_n,yMax_n]). This repositioning is performed in Screen Space, so valid minimum and maximum values are limited to the range [-1,1] (i.e. the origin (0,0) is in the center of the image, (-1,-1) is the bottom-left corner, and (1,1) is the top-right corner). Note: Ascent does not check for correctness of user positioned color bars. + + +Automatic Camera +---------------- + +The automatic camera render is used to automatically choose a camera placement, basing the decision on a user-chosen viewpoint quality (VQ) metric. +The automatic camera render requires a mesh and scalar field data, and works in conjunction with other Filters. +The automatic camera render analyzes the data that will be rendered using a user-chosen metric and number of considered cameras. +Given the number of cameras, the camera placements are determined using Fibonacci's Lattice, a method for placing points around a unit sphere, and the camera is pointed at the center of the data. + +A user can specify the number of camera samples (``auto_camera/samples``) to consider when determining the best camera placement. +The user also specifies the field data (``auto_camera/field``) the VQ metric will operate on, as well as the VQ metric (``auto_camera/metric``). +The current VQ metrics and respective keywords are: + Data Entropy : ``data_entropy`` + Depth Entropy : ``depth_entropy`` + Shading Entropy : ``shading_entropy`` + DDS Entropy : ``dds_entropy`` + +There are also several optional parameters a user can specify, such as the number of bins (``auto_camera/bins=256``) to be used in the entropy calculations, as well as height (``auto_camera/height=1024``) and width (``auto_camera/width=1024``). + +Usage Recommendation: +Automatically producing quality camera placements is a difficult task, and not all of the available VQ metrics consistently produce viewpoints that users want to see or find insightful. +If users do not have a prior preference, we recommend using the VQ metric DDS Entropy, which is the sum of Data Entropy, Depth Entropy, and Shading Entropy. +Marsaglia et al. \cite{marsaglialdav} performed a user study that showed that out of the available VQ metrics, DDS Entropy produces viewpoints that scientific experts prefer. + +The code below creates a pipeline that first applies a contour filter and then applies the camera filter before declaring a scene. + + +.. code-block:: c++ + conduit::Node pipelines; + // pipeline 1 + pipelines["pl1/f1/type"] = "isovolume"; + // filter knobs + conduit::Node &clip_params = pipelines["pl1/f1/params"]; + clip_params["field"] = "braid"; + clip_params["min_value"] = 5.; + clip_params["max_value"] = 10.; + + //scene 1 + conduit::Node scenes; + scenes["s1/plots/p1/type"] = "pseudocolor"; + scenes["s1/plots/p1/field"] = "radial"; + scenes["s1/plots/p1/pipeline"] = "pl1"; + + //camera knobs + scenes["s1/renders/r1/type"] = "auto_camera"; + scenes["s1/renders/r1/auto_camera/metric"] = "dds_entropy"; + scenes["s1/renders/r1/auto_camera/samples"] = 5; + scenes["s1/renders/r1/auto_camera/field"] = "radial"; + + scenes["s1/renders/r1/image_prefix"] = output_file; + +.. _defaultcam: + +.. figure:: ../images/cam_default.png + :scale: 50 % + :align: center + + The default camera placement for this example. + +.. _dataentropycam: + +.. figure:: ../images/cam_ddsentropy.png + :scale: 50 % + :align: center + + The camera placement chosen by the VQ metric DDS Entropy for this example. + This example and implementation of the other VQ metrics can be found in `auto_camera test `_. .. _actions_cinema: diff --git a/src/docs/sphinx/Actions/examples/tout_binning_filter_bins100.png b/src/docs/sphinx/Actions/examples/tout_binning_filter_bins100.png new file mode 100644 index 000000000..8959980d3 Binary files /dev/null and b/src/docs/sphinx/Actions/examples/tout_binning_filter_bins100.png differ diff --git a/src/docs/sphinx/Actions/examples/tout_binning_filter_bins100.yaml b/src/docs/sphinx/Actions/examples/tout_binning_filter_bins100.yaml new file mode 100644 index 000000000..be3a89c69 --- /dev/null +++ b/src/docs/sphinx/Actions/examples/tout_binning_filter_bins100.yaml @@ -0,0 +1,38 @@ +#An example of data binning, binning spatially and summing a field. + +- + action: "add_pipelines" + pipelines: + pl1: + f1: + type: "binning" + params: + reduction_op: "sum" + reduction_field: "braid" + output_field: "binning" + output_type: "bins" + axes: + - + field: "x" + num_bins: 10 + min_val: -10.0 + max_val: 10.0 + clamp: 1 + - + field: "y" + num_bins: 10 + clamp: 0 + - + field: "z" + num_bins: 10 + clamp: 10 +- + action: "add_scenes" + scenes: + s1: + plots: + p1: + type: "pseudocolor" + field: "binning" + pipeline: "pl1" + image_prefix: "/Users/harrison37/Work/alpine/ascent/build-debug/tests/_output/tout_binning_filter_bins" diff --git a/src/docs/sphinx/QuickStart.rst b/src/docs/sphinx/QuickStart.rst index 07621f920..adc239a89 100644 --- a/src/docs/sphinx/QuickStart.rst +++ b/src/docs/sphinx/QuickStart.rst @@ -31,7 +31,11 @@ This container automatically launches a Jupyter Notebook server on port 8888. As Installing Ascent and Third Party Dependencies ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -The quickest path to install Ascent and its dependencies is via :ref:`uberenv `: +We provide two scripted options to quickly install Ascent and its dependencies. + +uberenv.py +++++++++++++++++++ +You can use :ref:`uberenv `, a python script that leverages spack to build Ascent and its dependencies: .. code:: bash @@ -52,56 +56,80 @@ We also provide spack settings for several well known HPC clusters, here is an e For more details about building and installing Ascent see :ref:`building`. This page provides detailed info about Ascent's CMake options, :ref:`uberenv ` and :ref:`Spack ` support. We also provide info about :ref:`building for known HPC clusters using uberenv ` and a :ref:`Docker example ` that leverages Spack. -Public Installs of Ascent -~~~~~~~~~~~~~~~~~~~~~~~~~ - -We also provide public installs of Ascent for the default compilers at a few DOE HPC centers. - -Summary table of public ascent installs: - -.. list-table:: - :widths: 10 15 10 10 20 50 - :header-rows: 1 - - * - Site - - System - - Compiler - - Runtime - - Modules - - Install Path - - * - OLCF - - Summit - - gcc 9.3.0 - - CUDA 11.0.3 - - ``gcc/9.3.0`` ``cuda/11.0.3`` - - ``/sw/summit/ums/ums010/ascent/current/summit/cuda/gnu/ascent-install/`` +build_ascent.sh +++++++++++++++++++ - * - OLCF - - Summit - - gcc 9.3.0 - - OpenMP - - ``gcc/9.3.0`` - - ``/sw/summit/ums/ums010/ascent/current/summit/openmp/gnu/ascent-install/`` +You can use ``build_ascent.sh``, a stand alone shell script to build Ascent and its dependencies: - * - NERSC - - Permutter - - gcc 9.3.0 - - CUDA 11.4.0 - - ``PrgEnv-gnu`` ``cpe-cuda/21.12`` ``cudatoolkit/21.9_11.4`` - - ``/global/cfs/cdirs/alpine/software/ascent/current/perlmutter/cuda/gnu/ascent-install/`` - - * - LLNL LC - - CZ TOSS 3 (Pascal) - - gcc 4.9.3 - - OpenMP - - (none) - - ``/usr/gapps/conduit/software/ascent/current/toss_3_x86_64_ib/openmp/gnu/ascent-install`` - - -`Here is a link to the scripts we use to build public Ascent installs. `_ +.. code:: bash -See :ref:`tutorial_setup_public_installs` for more details on using these installs. + # prerequisite: `cmake` must be in your path + git clone --recursive https://github.com/alpine-dav/ascent.git + cd ascent + env prefix=build ./scripts/build_ascent/build_ascent.sh + +After this completes, ``build/install/ascent-develop`` will contain an Ascent install. + +``build_ascent.sh`` serves both to help with automatically building Ascent as well as documenting the steps necessary to configure and build Ascent and its dependencies using CMake: + + * `https://github.com/Alpine-DAV/ascent/blob/develop/scripts/build_ascent/build_ascent.sh `_ + + +We also provide also wrapper scripts for specific HPC platforms (e.g. ``build_ascent_hip_frontier.sh`` for ORNL's Frontier, etc) script that you can leverage. Here is the Frontier HIP build script: + + * `https://github.com/Alpine-DAV/ascent/blob/develop/scripts/build_ascent/build_ascent_hip_frontier.sh `_ + + +.. Public Installs of Ascent +.. ~~~~~~~~~~~~~~~~~~~~~~~~~ +.. +.. We also provide public installs of Ascent for the default compilers at a few DOE HPC centers. +.. +.. Summary table of public ascent installs: +.. +.. .. list-table:: +.. :widths: 10 15 10 10 20 50 +.. :header-rows: 1 +.. +.. * - Site +.. - System +.. - Compiler +.. - Runtime +.. - Modules +.. - Install Path +.. +.. * - OLCF +.. - Summit +.. - gcc 9.3.0 +.. - CUDA 11.0.3 +.. - ``gcc/9.3.0`` ``cuda/11.0.3`` +.. - ``/sw/summit/ums/ums010/ascent/current/summit/cuda/gnu/ascent-install/`` +.. +.. * - OLCF +.. - Summit +.. - gcc 9.3.0 +.. - OpenMP +.. - ``gcc/9.3.0`` +.. - ``/sw/summit/ums/ums010/ascent/current/summit/openmp/gnu/ascent-install/`` +.. +.. * - NERSC +.. - Permutter +.. - gcc 9.3.0 +.. - CUDA 11.4.0 +.. - ``PrgEnv-gnu`` ``cpe-cuda/21.12`` ``cudatoolkit/21.9_11.4`` +.. - ``/global/cfs/cdirs/alpine/software/ascent/current/perlmutter/cuda/gnu/ascent-install/`` +.. +.. * - LLNL LC +.. - CZ TOSS 3 (Pascal) +.. - gcc 4.9.3 +.. - OpenMP +.. - (none) +.. - ``/usr/gapps/conduit/software/ascent/current/toss_3_x86_64_ib/openmp/gnu/ascent-install`` +.. +.. +.. `Here is a link to the scripts we use to build public Ascent installs. `_ +.. +.. See :ref:`tutorial_setup_public_installs` for more details on using these installs. .. _using_in_your_project: diff --git a/src/docs/sphinx/Releases.rst b/src/docs/sphinx/Releases.rst index 5be689722..f5a726163 100644 --- a/src/docs/sphinx/Releases.rst +++ b/src/docs/sphinx/Releases.rst @@ -20,6 +20,42 @@ Source distributions for Ascent are hosted on github: https://github.com/Alpine-DAV/ascent/releases +v0.9.2 +--------------------------------- + +* `Source Tarball `__ + +* Docker Containers + * ``alpinedav/ascent:0.9.2`` + * ``alpinedav/ascent-jupyter:0.9.2`` + +Highlights +++++++++++++++++++++++++++++++++++++ + +(Extracted from Ascent's :download:`Changelog <../../../CHANGELOG.md>`) + + +Preferred dependency versions for ascent@0.9.2 +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + + * conduit@0.8.8 + * vtk-m@2.0.0 + +Added +~~~~~ + + * Automatic camera placement render that uses different types of entropy (data, depth, shading). + * Scene/Render option to manually position color bars + * Added in-memory conduit extract, which allows mesh data to be accessed via ascent.info() + * Added examples that demonstrate how to use Ascent via the Catalyst Conduit Interface. + +Changed +~~~~~~~ + + * Updated Ascent to use VTK-m 2.0 + * Added C++ ``Ascent::info()`` method that returns a reference to execution info in addition the existing info() method that provides copy out semantics. + + v0.9.1 --------------------------------- diff --git a/src/docs/sphinx/Tutorial.rst b/src/docs/sphinx/Tutorial.rst index 6b4ae6648..394b35156 100644 --- a/src/docs/sphinx/Tutorial.rst +++ b/src/docs/sphinx/Tutorial.rst @@ -8,7 +8,7 @@ Tutorial Overview ================== -`Ascent Tutorial Intro Slides [pdf] `_ +`Ascent Tutorial Intro Slides [pdf] `_ This tutorial introduces how to use Ascent, including basics about: @@ -22,12 +22,11 @@ Ascent installs include standalone C++, Python, and Python-based Jupyter noteboo You can find the tutorial source code and notebooks in your Ascent install directory under ``examples/ascent/tutorial/ascent_intro/`` and the Cloverleaf3D demo files under ``examples/ascent/tutorial/cloverleaf_demos/``. -Scheduled Tutorials: +Tutorials: + * `In-Situ Analysis and Visualization with Ascent and ParaView Catalyst `_ - November 2023, Denver, CO, USA + * `Introduction to Ascent, a Flyweight In Situ Visualization and Analysis for HPC Simulations @ LLNL's RADIUSS AWS Tutorial Series 2023 `_ - August 2023, Virtual * `Introduction to Ascent, a Flyweight In Situ Visualization and Analysis for HPC Simulations @ LLNL's RADIUSS AWS Tutorial Series 2022 `_ - August 2022, Virtual - - -Past Tutorials: * `In Situ Analysis and Visualization with ParaView Catalyst and Ascent @ ISC 2022 `_ - May 2022, Hamburg, Germany * ECP 2022 Annual Meeting - May 2022, Virtual * `In Situ Analysis and Visualization with SENSEI and Ascent @ SC21 `_ - Nov 2021, Virtual diff --git a/src/docs/sphinx/Tutorial_Setup.rst b/src/docs/sphinx/Tutorial_Setup.rst index b7a1bb693..649fe6a7f 100644 --- a/src/docs/sphinx/Tutorial_Setup.rst +++ b/src/docs/sphinx/Tutorial_Setup.rst @@ -62,95 +62,95 @@ You can also launch the a Jupyter Notebook server from this image using the foll The url (http://localhost:8888) and password (``learn``) are the same as above. -.. _tutorial_setup_public_installs: - -Using Public Installs of Ascent -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -This section provides info about public installs we provide on several HPC machines. - -Additionally, here is a `link to the scripts used to build our public installs `_ . - -OLCF Summit Installs -+++++++++++++++++++++++ - - -* Build Details: gcc 9.3.0 with OpenMP and MPI support -* Modules: ``gcc/9.3.0`` -* Location: ``/sw/summit/ums/ums010/ascent/current/summit/openmp/gnu/ascent-install/`` - -You can copy the tutorial examples from this install and use them as follows: - -.. literalinclude:: tutorial_setup_olcf_summit_openmp_test.sh - :language: bash - -* Build Details: gcc 9.3.0 with CUDA 11.0.3 and MPI support -* Modules: ``gcc/9.3.0`` ``cuda/11.0.3`` -* Location: ``/sw/summit/ums/ums010/ascent/current/summit/cuda/gnu/ascent-install/`` - -You can copy the tutorial examples from this install and use them as follows: - -.. literalinclude:: tutorial_setup_olcf_summit_cuda_test.sh - :language: bash - - -NERSC Perlmuter Install -+++++++++++++++++++++++ - -* Build Details: gcc 10.3.0 with CUDA 11.4.0 and MPI support -* Modules: ``PrgEnv-gnu`` ``cpe-cuda/21.12`` ``cudatoolkit/21.9_11.4`` -* Location: ``/global/cfs/cdirs/alpine/software/ascent/current/perlmutter/cuda/gnu/ascent-install/`` - - -You can copy the tutorial examples from this install and use them as follows: - -.. literalinclude:: tutorial_setup_nersc_perlmutter_test.sh - :language: bash - - -LLNL CZ TOSS 3 Install -+++++++++++++++++++++++ - -* Build Details: gcc 4.9.3 with OpenMP and MPI support -* Modules: (none) -* Location: ``/usr/gapps/conduit/software/ascent/current/toss_3_x86_64_ib/openmp/gnu/ascent-install/`` - -You can copy the tutorial examples from this install and use them as follows: - -.. literalinclude:: tutorial_setup_llnl_pascal_openmp_test.sh - :language: bash - - -Register Ascent's Python as a Jupyter Kernel -+++++++++++++++++++++++++++++++++++++++++++++ - -.. warning:: - This works the LLNL LC TOSS3 CZ OpenMP install, we are working on recipes for other HPC centers. - -You can register Ascent's Python as a custom Jupyter kernel with Jupyter Hub. - -LLNL CZ TOSS 3 Jupyter Kernel Register Example: - -.. literalinclude:: tutorial_setup_llnl_pascal_openmp_jhub.sh - :language: bash - -After you register you will see an option to launch an Ascent kernel in Jupyter Hub: - -.. image:: images/llnl_jhub_kernel_select.png - -With this kernel you can access Ascent's Python modules or run the tutorial notebooks: - -.. image:: images/llnl_jhub_kernel_example.png - +.. .. _tutorial_setup_public_installs: +.. +.. Using Public Installs of Ascent +.. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.. +.. This section provides info about public installs we provide on several HPC machines. +.. +.. Additionally, here is a `link to the scripts used to build our public installs `_ . +.. +.. OLCF Summit Installs +.. +++++++++++++++++++++++ +.. +.. +.. * Build Details: gcc 9.3.0 with OpenMP and MPI support +.. * Modules: ``gcc/9.3.0`` +.. * Location: ``/sw/summit/ums/ums010/ascent/current/summit/openmp/gnu/ascent-install/`` +.. +.. You can copy the tutorial examples from this install and use them as follows: +.. +.. .. literalinclude:: tutorial_setup_olcf_summit_openmp_test.sh +.. :language: bash +.. +.. * Build Details: gcc 9.3.0 with CUDA 11.0.3 and MPI support +.. * Modules: ``gcc/9.3.0`` ``cuda/11.0.3`` +.. * Location: ``/sw/summit/ums/ums010/ascent/current/summit/cuda/gnu/ascent-install/`` +.. +.. You can copy the tutorial examples from this install and use them as follows: +.. +.. .. literalinclude:: tutorial_setup_olcf_summit_cuda_test.sh +.. :language: bash +.. +.. +.. NERSC Perlmuter Install +.. +++++++++++++++++++++++ +.. +.. * Build Details: gcc 10.3.0 with CUDA 11.4.0 and MPI support +.. * Modules: ``PrgEnv-gnu`` ``cpe-cuda/21.12`` ``cudatoolkit/21.9_11.4`` +.. * Location: ``/global/cfs/cdirs/alpine/software/ascent/current/perlmutter/cuda/gnu/ascent-install/`` +.. +.. +.. You can copy the tutorial examples from this install and use them as follows: +.. +.. .. literalinclude:: tutorial_setup_nersc_perlmutter_test.sh +.. :language: bash +.. +.. +.. LLNL CZ TOSS 3 Install +.. +++++++++++++++++++++++ +.. +.. * Build Details: gcc 4.9.3 with OpenMP and MPI support +.. * Modules: (none) +.. * Location: ``/usr/gapps/conduit/software/ascent/current/toss_3_x86_64_ib/openmp/gnu/ascent-install/`` +.. +.. You can copy the tutorial examples from this install and use them as follows: +.. +.. .. literalinclude:: tutorial_setup_llnl_pascal_openmp_test.sh +.. :language: bash -If you want to remove the registered kernel, you can use: -.. code:: - - # show list of registered kernels - jupyter kernelspec list - # remove our Ascent custom kernel - jupyter kernelspec uninstall ascent_kernel +.. Register Ascent's Python as a Jupyter Kernel +.. +++++++++++++++++++++++++++++++++++++++++++++ +.. +.. .. warning:: +.. This works the LLNL LC TOSS3 CZ OpenMP install, we are working on recipes for other HPC centers. +.. +.. You can register Ascent's Python as a custom Jupyter kernel with Jupyter Hub. +.. +.. LLNL CZ TOSS 3 Jupyter Kernel Register Example: +.. +.. .. literalinclude:: tutorial_setup_llnl_pascal_openmp_jhub.sh +.. :language: bash +.. +.. After you register you will see an option to launch an Ascent kernel in Jupyter Hub: +.. +.. .. image:: images/llnl_jhub_kernel_select.png +.. +.. With this kernel you can access Ascent's Python modules or run the tutorial notebooks: +.. +.. .. image:: images/llnl_jhub_kernel_example.png +.. +.. +.. If you want to remove the registered kernel, you can use: +.. +.. .. code:: +.. +.. # show list of registered kernels +.. jupyter kernelspec list +.. # remove our Ascent custom kernel +.. jupyter kernelspec uninstall ascent_kernel .. .. SC19 Tutorial VM Option diff --git a/src/docs/sphinx/conf.py b/src/docs/sphinx/conf.py index 0f8848c79..7c8696604 100644 --- a/src/docs/sphinx/conf.py +++ b/src/docs/sphinx/conf.py @@ -64,9 +64,9 @@ # built documents. # # The short X.Y version. -version = '0.9.1' +version = '0.9.2' # The full version, including alpha/beta/rc tags. -release = '0.9.1' +release = '0.9.2' # The language for content autogenerated by Sphinx. Refer to documentation # for a list of supported languages. diff --git a/src/docs/sphinx/images/cam_ddsentropy.png b/src/docs/sphinx/images/cam_ddsentropy.png new file mode 100644 index 000000000..b146d5616 Binary files /dev/null and b/src/docs/sphinx/images/cam_ddsentropy.png differ diff --git a/src/docs/sphinx/images/cam_default.png b/src/docs/sphinx/images/cam_default.png new file mode 100644 index 000000000..c9411669c Binary files /dev/null and b/src/docs/sphinx/images/cam_default.png differ diff --git a/src/docs/sphinx/requirements.txt b/src/docs/sphinx/requirements.txt index c896d4dff..09e5b504b 100644 --- a/src/docs/sphinx/requirements.txt +++ b/src/docs/sphinx/requirements.txt @@ -1 +1,3 @@ -docutils<0.18 \ No newline at end of file +docutils +sphinx==6.2.1 +sphinx-rtd-theme==1.2.2 \ No newline at end of file diff --git a/src/examples/CMakeLists.txt b/src/examples/CMakeLists.txt index 12ee83844..66460d4c4 100644 --- a/src/examples/CMakeLists.txt +++ b/src/examples/CMakeLists.txt @@ -26,11 +26,11 @@ if(BABELFLOW_FOUND) endif() # install using and python examples -install(DIRECTORY using-with-cmake using-with-make python tutorial +install(DIRECTORY ascent-catalyst using-with-cmake using-with-make python tutorial DESTINATION examples/ascent) if(MPI_FOUND) - install(DIRECTORY using-with-cmake-mpi using-with-make-mpi + install(DIRECTORY ascent-catalyst-mpi using-with-cmake-mpi using-with-make-mpi DESTINATION examples/ascent) endif() diff --git a/src/examples/ascent-catalyst-mpi/CMakeLists.txt b/src/examples/ascent-catalyst-mpi/CMakeLists.txt new file mode 100644 index 000000000..a6415843f --- /dev/null +++ b/src/examples/ascent-catalyst-mpi/CMakeLists.txt @@ -0,0 +1,57 @@ +# Copyright (c) Lawrence Livermore National Security, LLC and other Ascent +# Project developers. See top-level LICENSE AND COPYRIGHT files for dates and +# other details. No copyright assignment is required to contribute to Ascent. +############################################################################### + +############################################################################### +# +# Example that shows how to use an installed instance of Ascent in another +# CMake-based build system. +# +# To build: +# cmake -DAscent_DIR={ascent install path} -B build -S . +# cp ascent_actions.yaml build +# cd build +# make +# ./ascent_catalyst_mpi_example +# +# In order to run directly in a sub directory below ascent-catalyst_mpi in an ascent install, +# set Ascent_DIR to ../../.. +# +# cmake -DAscent_DIR=../../.. -B build -S . +# cp ascent_actions.yaml build +# cd build +# make +# ./ascent_catalyst_mpi_example +# +############################################################################### + +cmake_minimum_required(VERSION 3.9) + +project(ascent_catalyst_mpi) + +# +# Use CMake's find_package to import ascent's targets +# +# PATHS is just a hint if someone runs this example from the Ascent install +# tree without setting up an environment hint to find Ascent +find_package(Ascent REQUIRED + NO_DEFAULT_PATH + PATHS ${CMAKE_SOURCE_DIR}/../../../) + +find_package(MPI REQUIRED COMPONENTS CXX) + +find_package(catalyst 2.0 REQUIRED) + +# create our example +add_executable(ascent_catalyst_mpi_example ascent_catalyst_mpi_example.cpp) + +# link to ascent and catalyst +target_link_libraries(ascent_catalyst_mpi_example ascent::ascent_mpi catalyst::catalyst) + +# if cuda is in the mix: +# we need to make sure CUDA_RESOLVE_DEVICE_SYMBOLS is on for our target +# (it propgates some way magically in 3.14, but not in 3.21) +if(CMAKE_CUDA_COMPILER) + set_property(TARGET ascent_catalyst_mpi_example PROPERTY CUDA_RESOLVE_DEVICE_SYMBOLS ON) +endif() diff --git a/src/examples/ascent-catalyst-mpi/ascent_actions.yaml b/src/examples/ascent-catalyst-mpi/ascent_actions.yaml new file mode 100644 index 000000000..4692fdb05 --- /dev/null +++ b/src/examples/ascent-catalyst-mpi/ascent_actions.yaml @@ -0,0 +1,9 @@ +- + action: "add_scenes" + scenes: + s1: + plots: + p1: + type: "pseudocolor" + field: "braid" + image_name: "out_ascent_catalyst_mpi_example" diff --git a/src/examples/ascent-catalyst-mpi/ascent_catalyst_mpi_example.cpp b/src/examples/ascent-catalyst-mpi/ascent_catalyst_mpi_example.cpp new file mode 100644 index 000000000..2d6571343 --- /dev/null +++ b/src/examples/ascent-catalyst-mpi/ascent_catalyst_mpi_example.cpp @@ -0,0 +1,63 @@ +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~// +// Copyright (c) Lawrence Livermore National Security, LLC and other Ascent +// Project developers. See top-level LICENSE AND COPYRIGHT files for dates and +// other details. No copyright assignment is required to contribute to Ascent. +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~// + +//----------------------------------------------------------------------------- +/// +/// file: ascent_catalyst_mpi_example.cpp +/// +//----------------------------------------------------------------------------- + +#include +#include +#include + +#include +#include + +using namespace conduit; + +int main(int argc, char **argv) +{ + MPI_Init(&argc, &argv); + + MPI_Comm mpi_comm = MPI_COMM_WORLD; + int par_rank, par_size; + MPI_Comm_rank(mpi_comm, &par_rank); + MPI_Comm_size(mpi_comm, &par_size); + + // Custom catalyst implementations require that we use conduit's C API + conduit_node *initialize = conduit_node_create(); + conduit_node_set_path_char8_str(initialize, "catalyst_load/implementation", "ascent"); + conduit_node_set_path_char8_str(initialize, "catalyst/scripts/my_actions", "ascent_actions.yaml"); + catalyst_initialize(initialize); + + if (par_rank == 0) + { + conduit_node *about = conduit_node_create(); + catalyst_about(about); + conduit_node_print(about); + } + + // create an example dataset + conduit::Node mesh; + conduit::blueprint::mesh::examples::braid("uniform", 10, 10, 10, mesh); + + // to make a multi domain example, offset the x coords by par_rank + mesh["coordsets/coords/origin/x"] = -10 + 20 * par_rank; + + // We can still use conduit's C++ API + conduit::Node data; + data["catalyst/channels/grid/data"].set_external(mesh); + + // We just have to convert cpp_nodes into c_nodes before passing them to catalyst + conduit_node *data_converted = c_node(&data); + catalyst_execute(data_converted); + + conduit_node *finalize = conduit_node_create(); + catalyst_finalize(finalize); + + MPI_Finalize(); +} diff --git a/src/examples/ascent-catalyst/CMakeLists.txt b/src/examples/ascent-catalyst/CMakeLists.txt new file mode 100644 index 000000000..3ccb3bd8c --- /dev/null +++ b/src/examples/ascent-catalyst/CMakeLists.txt @@ -0,0 +1,55 @@ +# Copyright (c) Lawrence Livermore National Security, LLC and other Ascent +# Project developers. See top-level LICENSE AND COPYRIGHT files for dates and +# other details. No copyright assignment is required to contribute to Ascent. +############################################################################### + +############################################################################### +# +# Example that shows how to use an installed instance of Ascent in another +# CMake-based build system. +# +# To build: +# cmake -DAscent_DIR={ascent install path} -B build -S . +# cp ascent_actions.yaml build +# cd build +# make +# ./ascent_catalyst_example +# +# In order to run directly in a sub directory below ascent-catalyst in an ascent install, +# set Ascent_DIR to ../../.. +# +# cmake -DAscent_DIR=../../.. -B build -S . +# cp ascent_actions.yaml build +# cd build +# make +# ./ascent_catalyst_example +# +############################################################################### + +cmake_minimum_required(VERSION 3.9) + +project(ascent_catalyst) + +# +# Use CMake's find_package to import ascent's targets +# +# PATHS is just a hint if someone runs this example from the Ascent install +# tree without setting up an environment hint to find Ascent +find_package(Ascent REQUIRED + NO_DEFAULT_PATH + PATHS ${CMAKE_SOURCE_DIR}/../../../) + +find_package(catalyst 2.0 REQUIRED) + +# create our example +add_executable(ascent_catalyst_example ascent_catalyst_example.cpp) + +# link to ascent and catalyst +target_link_libraries(ascent_catalyst_example ascent::ascent catalyst::catalyst) + +# if cuda is in the mix: +# we need to make sure CUDA_RESOLVE_DEVICE_SYMBOLS is on for our target +# (it propgates some way magically in 3.14, but not in 3.21) +if(CMAKE_CUDA_COMPILER) + set_property(TARGET ascent_catalyst_example PROPERTY CUDA_RESOLVE_DEVICE_SYMBOLS ON) +endif() diff --git a/src/examples/ascent-catalyst/ascent_actions.yaml b/src/examples/ascent-catalyst/ascent_actions.yaml new file mode 100644 index 000000000..83fee1ebd --- /dev/null +++ b/src/examples/ascent-catalyst/ascent_actions.yaml @@ -0,0 +1,9 @@ +- + action: "add_scenes" + scenes: + s1: + plots: + p1: + type: "pseudocolor" + field: "braid" + image_name: "out_ascent_catalyst_example" diff --git a/src/examples/ascent-catalyst/ascent_catalyst_example.cpp b/src/examples/ascent-catalyst/ascent_catalyst_example.cpp new file mode 100644 index 000000000..6e31fee2a --- /dev/null +++ b/src/examples/ascent-catalyst/ascent_catalyst_example.cpp @@ -0,0 +1,47 @@ +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~// +// Copyright (c) Lawrence Livermore National Security, LLC and other Ascent +// Project developers. See top-level LICENSE AND COPYRIGHT files for dates and +// other details. No copyright assignment is required to contribute to Ascent. +//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~// + +//----------------------------------------------------------------------------- +/// +/// file: ascent_catalyst_example.cpp +/// +//----------------------------------------------------------------------------- + +#include +#include +#include + +#include + +using namespace conduit; + +int main(int argc, char **argv) +{ + // Custom catalyst implementations require that we use conduit's C API + conduit_node *initialize = conduit_node_create(); + conduit_node_set_path_char8_str(initialize, "catalyst_load/implementation", "ascent"); + conduit_node_set_path_char8_str(initialize, "catalyst/scripts/my_actions", "ascent_actions.yaml"); + catalyst_initialize(initialize); + + conduit_node *about = conduit_node_create(); + catalyst_about(about); + conduit_node_print(about); + + // create an example dataset + conduit::Node mesh; + conduit::blueprint::mesh::examples::braid("uniform", 10, 10, 10, mesh); + + // We can still use conduit's C++ API + conduit::Node data; + data["catalyst/channels/grid/data"].set_external(mesh); + + // We just have to convert cpp_nodes into c_nodes before passing them to catalyst + conduit_node *data_converted = c_node(&data); + catalyst_execute(data_converted); + + conduit_node *finalize = conduit_node_create(); + catalyst_finalize(finalize); +} diff --git a/src/examples/docker/ubuntu/Dockerfile b/src/examples/docker/ubuntu/Dockerfile index 3f96bebd2..c103581cc 100644 --- a/src/examples/docker/ubuntu/Dockerfile +++ b/src/examples/docker/ubuntu/Dockerfile @@ -2,7 +2,8 @@ # Project developers. See top-level LICENSE AND COPYRIGHT files for dates and # other details. No copyright assignment is required to contribute to Ascent. -FROM alpinedav/ascent-ci:ubuntu-22.04-devel +ARG TAG_ARCH=x86_64 +FROM alpinedav/ascent-devel:ubuntu-22.04-${TAG_ARCH} # nodejs is needed by jupyterlab for widgets RUN curl -sL https://deb.nodesource.com/setup_14.x | bash - @@ -27,6 +28,7 @@ RUN /uberenv_libs/spack/opt/spack/*/*/python*/bin/pip \ bash_kernel \ jupyter \ jupyterlab \ + ipywidgets \ matplotlib \ pyyaml \ cinemasci \ @@ -34,10 +36,6 @@ RUN /uberenv_libs/spack/opt/spack/*/*/python*/bin/pip \ scikit-learn \ ipympl -# finish jupyter lab setup -RUN /uberenv_libs/spack/opt/spack/*/*/python*/bin/jupyter \ - labextension install @jupyter-widgets/jupyterlab-manager - # configure a debug build with cmake RUN cd /ascent && mkdir build RUN cd /ascent/build && \ diff --git a/src/examples/docker/ubuntu/ascent_jupyter/Dockerfile b/src/examples/docker/ubuntu/ascent_jupyter/Dockerfile index 101b8184e..113943223 100644 --- a/src/examples/docker/ubuntu/ascent_jupyter/Dockerfile +++ b/src/examples/docker/ubuntu/ascent_jupyter/Dockerfile @@ -2,7 +2,8 @@ # Project developers. See top-level LICENSE AND COPYRIGHT files for dates and # other details. No copyright assignment is required to contribute to Ascent. -FROM alpinedav/ascent:latest +ARG TAG=latest +FROM alpinedav/ascent:${TAG} # add our 'user' with password 'docker' RUN useradd -ms /bin/bash -G sudo user && echo "user:docker" | chpasswd diff --git a/src/examples/docker/ubuntu/ascent_jupyter/build.sh b/src/examples/docker/ubuntu/ascent_jupyter/build.sh index 4538e21ea..4ea6cd9b7 100755 --- a/src/examples/docker/ubuntu/ascent_jupyter/build.sh +++ b/src/examples/docker/ubuntu/ascent_jupyter/build.sh @@ -3,11 +3,13 @@ # Project developers. See top-level LICENSE AND COPYRIGHT files for dates and # other details. No copyright assignment is required to contribute to Ascent. -export TAG_BASE=alpinedav/ascent-jupyter:ascent-jupyter-ubuntu-18 +export TAG_ARCH=`uname -m` +export TAG_BASE=alpinedav/ascent-jupyter:ascent-jupyter-ubuntu-22.04-${ARCH} + date -python ../build_and_tag.py ${TAG_BASE} +python3 ../build_and_tag.py ${TAG_BASE} date diff --git a/src/examples/docker/ubuntu/build.sh b/src/examples/docker/ubuntu/build.sh old mode 100644 new mode 100755 index 4ebec2bd6..f6617ab55 --- a/src/examples/docker/ubuntu/build.sh +++ b/src/examples/docker/ubuntu/build.sh @@ -3,11 +3,13 @@ # Project developers. See top-level LICENSE AND COPYRIGHT files for dates and # other details. No copyright assignment is required to contribute to Ascent. -export TAG_BASE=alpinedav/ascent:ascent-ubuntu-22.04 +export REPO_NAME="ascent" +export TAG_ARCH=`uname -m` +export TAG_BASE=alpinedav/ascent:ascent-ubuntu-22.04-${TAG_ARCH} date -python build_and_tag.py ${TAG_BASE} --squash +python3 ../../../../scripts/docker_build_and_tag.py ${REPO_NAME} ${TAG_ARCH} ${TAG_BASE} --squash date diff --git a/src/examples/docker/ubuntu/build_and_tag.py b/src/examples/docker/ubuntu/build_and_tag.py deleted file mode 100644 index 6ea76d431..000000000 --- a/src/examples/docker/ubuntu/build_and_tag.py +++ /dev/null @@ -1,103 +0,0 @@ -# Copyright (c) Lawrence Livermore National Security, LLC and other VisIt -# Project developers. See the top-level LICENSE file for dates and other -# details. No copyright assignment is required to contribute to VisIt. - -# -# Helper script that drives our docker build and tag for ci -# - -import os -import sys -import subprocess -import shutil -import datetime - -from os.path import join as pjoin - -def remove_if_exists(path): - """ - Removes a file system path if it exists. - """ - if os.path.isfile(path): - os.remove(path) - if os.path.isdir(path): - shutil.rmtree(path) - -def timestamp(t=None,sep="-"): - """ Creates a timestamp that can easily be included in a filename. """ - if t is None: - t = datetime.datetime.now() - sargs = (t.year,t.month,t.day) - sbase = "".join(["%04d",sep,"%02d",sep,"%02d"]) - return sbase % sargs - -def sexe(cmd,ret_output=False,echo = True): - """ Helper for executing shell commands. """ - if echo: - print("[exe: {}]".format(cmd)) - if ret_output: - p = subprocess.Popen(cmd, - shell=True, - stdout=subprocess.PIPE, - stderr=subprocess.STDOUT) - res = p.communicate()[0] - res = res.decode('utf8') - return p.returncode,res - else: - return subprocess.call(cmd,shell=True) - -def git_hash(): - """ - Returns the current git repo hash, or UNKNOWN - """ - res = "UNKNOWN" - rcode,rout = sexe("git rev-parse HEAD",ret_output=True) - if rcode == 0: - res = rout - return res; - -def gen_docker_tag(): - """ - Creates a useful docker tag for the current build. - """ - ghash = git_hash() - if ghash != "UNKNOWN": - ghash = ghash[:6] - return timestamp() + "-sha" + ghash - -def main(): - # get tag-base - if len(sys.argv) < 2: - print("usage: build_and_tag.py {tag_base} ") - sys.exit(-1) - tag_base = sys.argv[1] - - extra_args = "" - if len(sys.argv) > 2: - extra_args = sys.argv[2] - - # remove old source tarball if it exists - remove_if_exists("ascent.docker.src.tar.gz") - - # save current working dir so we can get back here - orig_dir = os.path.abspath(os.getcwd()) - - # get current copy of the ascent source - os.chdir("../../../../") - - # get current copy of the ascent source - cmd ='python package.py {0}' - sexe(cmd.format(pjoin(orig_dir, "ascent.docker.src.tar.gz"))) - - # change back to orig working dir - os.chdir(orig_dir) - - # exec docker build to create image - # tag with date + git hash - sexe('docker build -t {0}_{1} . {2}'.format(tag_base, - gen_docker_tag(), - extra_args)) - -if __name__ == "__main__": - main() - diff --git a/src/examples/tutorial/ascent_intro/notebooks/01_ascent_first_light.ipynb b/src/examples/tutorial/ascent_intro/notebooks/01_ascent_first_light.ipynb index 7ba6a4b43..e4184d4e0 100644 --- a/src/examples/tutorial/ascent_intro/notebooks/01_ascent_first_light.ipynb +++ b/src/examples/tutorial/ascent_intro/notebooks/01_ascent_first_light.ipynb @@ -6,7 +6,7 @@ "source": [ "## First Light Example\n", "### Render a sample dataset using Ascent\n", - "To start, we run a basic “First Light” example to generate an image. This example renders the an example dataset using ray casting to create a pseudocolor plot. The dataset is one of the built-in Conduit Mesh Blueprint examples, in this case an unstructured mesh composed of hexagons." + "To start, we run a basic “First Light” example to generate an image. This example renders the example dataset using ray casting to create a pseudocolor plot. The dataset is one of the built-in Conduit Mesh Blueprint examples, in this case an unstructured mesh composed of hexagons." ] }, { @@ -118,11 +118,47 @@ "# close ascent\n", "a.close()" ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Exercise\n", + "\n", + "**First**, change the \"field\" name for this dataset from \"braid\" to \"radial\" and re-plot the image.\n", + "\n", + "**Second**, observe how the image generated changes as you decrease the number of points on the mesh. For example, move from a 50x50x50 mesh to a 15x15x15 mesh.\n", + "\n" + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Exercise solution\n", + "Run the cell below once to see solutions and twice to run them." + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [ + "%load solutions/exercise1.py" + ] } ], "metadata": { "kernelspec": { - "display_name": "Python 3", + "display_name": "Python 3 (ipykernel)", "language": "python", "name": "python3" }, @@ -136,7 +172,7 @@ "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", - "version": "3.7.6" + "version": "3.9.13" } }, "nbformat": 4, diff --git a/src/examples/tutorial/ascent_intro/notebooks/02_conduit_basics.ipynb b/src/examples/tutorial/ascent_intro/notebooks/02_conduit_basics.ipynb index 8a122a494..5c3579459 100644 --- a/src/examples/tutorial/ascent_intro/notebooks/02_conduit_basics.ipynb +++ b/src/examples/tutorial/ascent_intro/notebooks/02_conduit_basics.ipynb @@ -118,11 +118,77 @@ "\n", "print(n.to_yaml())" ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Exercise\n", + "\n", + "**First**, create a tree with the following format:\n", + "\n", + "```\n", + "animals: \n", + " carnivores: \n", + " - \"cat\"\n", + " herbivores: \n", + " - \"koala\"\n", + " - \"sloth\"\n", + " omnivores: \n", + " - \"dog\"\n", + " - \"human\"\n", + "```\n", + "\n", + "Hint: You'll have to use lists.\n", + "\n", + "**Second**\n", + "\n", + "Add \"bear\" to the list of omnivores in `animals` so that the tree looks like\n", + "\n", + "```\n", + "animals: \n", + " carnivores: \n", + " - \"cat\"\n", + " herbivores: \n", + " - \"koala\"\n", + " - \"sloth\"\n", + " omnivores: \n", + " - \"dog\"\n", + " - \"human\"\n", + " - \"bear\"\n", + "```\n", + "\n", + "Here you'll use the `set` method introduced above! See [these docs](https://llnl-conduit.readthedocs.io/en/latest/tutorial_python_basics.html) for help." + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Exercise solution\n", + "Run the cell below once to see solutions and twice to run them." + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [ + "%load solutions/exercise2.py" + ] } ], "metadata": { "kernelspec": { - "display_name": "Python 3", + "display_name": "Python 3 (ipykernel)", "language": "python", "name": "python3" }, @@ -136,9 +202,9 @@ "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", - "version": "3.7.6" + "version": "3.9.13" } }, "nbformat": 4, - "nbformat_minor": 2 + "nbformat_minor": 4 } diff --git a/src/examples/tutorial/ascent_intro/notebooks/03_conduit_blueprint_mesh_examples.ipynb b/src/examples/tutorial/ascent_intro/notebooks/03_conduit_blueprint_mesh_examples.ipynb index b2ea0097e..b60b6e7c6 100644 --- a/src/examples/tutorial/ascent_intro/notebooks/03_conduit_blueprint_mesh_examples.ipynb +++ b/src/examples/tutorial/ascent_intro/notebooks/03_conduit_blueprint_mesh_examples.ipynb @@ -450,11 +450,55 @@ "# view our results\n", "ascent.jupyter.AscentImageSequenceViewer(result_image_files).show()" ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Exercise\n", + "\n", + "Use/alter the code from Mesh Blueprint Example 1 to create a scene with two plots: two versions of the alternating field on a uniform grid -- one with an origin at (-10,-10,-10) and one with an origin at (0,0,0).\n", + "\n", + "**First**, add a second coordinate set to `mesh` and call it `mycoords`. `mycoords` will have the same properties as `coords` except for the difference in origin.\n", + "\n", + "**Second**, add a second topology to `mesh` and call it `mytopo`. `mytopo` will have the same properties as `topo` except that its coordinate set will be `mycoords` instead of `coords`.\n", + "\n", + "**Third**, add a second field to `mesh` and call it `myalternating`. `myalternating` will have the same properties as `alternating` except that its topology will be `mytopo` instead of `topo`.\n", + "\n", + "**Fourth** add a second plot (`p2`) to the scene `s1`. `p1` will still plot the field `alternating` and `p2` should plot `myalternating`.\n", + "\n", + "Finally, use AscentViewer to plot the result.\n", + "\n" + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Exercise solution\n", + "Run the cell below once to see solutions and twice to run them." + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [ + "%load solutions/exercise3.py" + ] } ], "metadata": { "kernelspec": { - "display_name": "Python 3", + "display_name": "Python 3 (ipykernel)", "language": "python", "name": "python3" }, @@ -468,9 +512,9 @@ "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", - "version": "3.7.6" + "version": "3.9.13" } }, "nbformat": 4, - "nbformat_minor": 2 + "nbformat_minor": 4 } diff --git a/src/examples/tutorial/ascent_intro/notebooks/04_ascent_scene_examples.ipynb b/src/examples/tutorial/ascent_intro/notebooks/04_ascent_scene_examples.ipynb index bc6b30b92..8eeff1484 100644 --- a/src/examples/tutorial/ascent_intro/notebooks/04_ascent_scene_examples.ipynb +++ b/src/examples/tutorial/ascent_intro/notebooks/04_ascent_scene_examples.ipynb @@ -318,11 +318,57 @@ "# close ascent\n", "a.close()" ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Exercise\n", + "\n", + "Use and modify the code from Scene Example 3 (\"Adjusting camera parameters\").\n", + "Change the color scheme to Viridis and rotate the view of the tet example\n", + "360 degrees. \n", + "\n", + "**First**, update the name of the color table as in Example 4.\n", + "\n", + "**Second**, create 37 renders of `s1` with azimuth angles [0, 10, 20, 30, .... 360]\n", + "\n", + "Note: the following Python syntax for string interpolation may be helpful:\n", + "\n", + "```\n", + "a = \"world\"\n", + "print(f\"Hello {a}\")\n", + "```" + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Exercise solution\n", + "Run the cell below once to see solutions and twice to run them." + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [ + "%load solutions/exercise4.py" + ] } ], "metadata": { "kernelspec": { - "display_name": "Python 3", + "display_name": "Python 3 (ipykernel)", "language": "python", "name": "python3" }, @@ -336,9 +382,9 @@ "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", - "version": "3.7.6" + "version": "3.9.13" } }, "nbformat": 4, - "nbformat_minor": 2 + "nbformat_minor": 4 } diff --git a/src/examples/tutorial/ascent_intro/notebooks/05_ascent_pipeline_examples.ipynb b/src/examples/tutorial/ascent_intro/notebooks/05_ascent_pipeline_examples.ipynb index 32283869b..479934b44 100644 --- a/src/examples/tutorial/ascent_intro/notebooks/05_ascent_pipeline_examples.ipynb +++ b/src/examples/tutorial/ascent_intro/notebooks/05_ascent_pipeline_examples.ipynb @@ -317,11 +317,50 @@ "# close ascent\n", "a.close()" ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Exercise\n", + "\n", + "Use and refactor the code in Pipeline Example 3.\n", + "\n", + "**First** break the second pipeline `pl2` with two filters into two pipelines (`pl2` and `pl3`) -- one with a single filter each. \n", + "\n", + "**Second** create separate plots in `s1` for each of the three pipelines.\n", + "\n", + "You should end with a single scene and three plots that you can toggle between." + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Exercise solution\n", + "Run the cell below once to see solutions and twice to run them." + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [ + "%load solutions/exercise5.py" + ] } ], "metadata": { "kernelspec": { - "display_name": "Python 3", + "display_name": "Python 3 (ipykernel)", "language": "python", "name": "python3" }, @@ -335,9 +374,9 @@ "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", - "version": "3.7.6" + "version": "3.9.13" } }, "nbformat": 4, - "nbformat_minor": 2 + "nbformat_minor": 4 } diff --git a/src/examples/tutorial/ascent_intro/notebooks/06_ascent_extract_examples.ipynb b/src/examples/tutorial/ascent_intro/notebooks/06_ascent_extract_examples.ipynb index 4020113b8..b664216da 100644 --- a/src/examples/tutorial/ascent_intro/notebooks/06_ascent_extract_examples.ipynb +++ b/src/examples/tutorial/ascent_intro/notebooks/06_ascent_extract_examples.ipynb @@ -600,11 +600,48 @@ "else:\n", " print(\"Extract results match.\")" ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Exercise\n", + "\n", + "Use and modify the code from Relay Extract Example 2 above.\n", + "\n", + "**First**, add a second field -- \"radial\" -- to be saved alongside \"braid\".\n", + "\n", + "**Second** change the protocol from hdf5 to yaml and change the path of the file created from `out_export_braid_one_field` to `out_export_braid_two_fields`" + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Exercise solution\n", + "Run the cell below once to see solutions and twice to run them." + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [ + "%load solutions/exercise6.py" + ] } ], "metadata": { "kernelspec": { - "display_name": "Python 3", + "display_name": "Python 3 (ipykernel)", "language": "python", "name": "python3" }, @@ -618,9 +655,9 @@ "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", - "version": "3.7.6" + "version": "3.9.13" } }, "nbformat": 4, - "nbformat_minor": 2 + "nbformat_minor": 4 } diff --git a/src/examples/tutorial/ascent_intro/notebooks/07_ascent_query_examples.ipynb b/src/examples/tutorial/ascent_intro/notebooks/07_ascent_query_examples.ipynb index cedd52531..4383bc054 100644 --- a/src/examples/tutorial/ascent_intro/notebooks/07_ascent_query_examples.ipynb +++ b/src/examples/tutorial/ascent_intro/notebooks/07_ascent_query_examples.ipynb @@ -175,11 +175,50 @@ "plt.xlabel('cycle')\n", "plt.show()" ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Exercise\n", + "\n", + "Use and modify the code from Query Example 1:\n", + "\n", + "**First**, observe how changing the number of bins alters the entropy of the histogram in Query Example 1; change the number of bins from 128 to 64 and then to 32.\n", + "\n", + "**Second**, add two additional queries like `q2` -- `q3` with 64 bins and `q4` with 32 bins. \n", + "\n", + "**Third**, plot entropy vs. cycles for each of the three entropy queries. Create arrays to store the entropy as calculated for `q[1-3]` and overlay these entropies on the same plot. \n" + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Exercise solution\n", + "Run the cell below once to see solutions and twice to run them." + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [ + "%load solutions/exercise7.py" + ] } ], "metadata": { "kernelspec": { - "display_name": "Python 3", + "display_name": "Python 3 (ipykernel)", "language": "python", "name": "python3" }, @@ -193,9 +232,9 @@ "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", - "version": "3.7.6" + "version": "3.9.13" } }, "nbformat": 4, - "nbformat_minor": 2 + "nbformat_minor": 4 } diff --git a/src/examples/tutorial/ascent_intro/notebooks/08_ascent_trigger_examples.ipynb b/src/examples/tutorial/ascent_intro/notebooks/08_ascent_trigger_examples.ipynb index d03f4b5d4..5f09b6536 100644 --- a/src/examples/tutorial/ascent_intro/notebooks/08_ascent_trigger_examples.ipynb +++ b/src/examples/tutorial/ascent_intro/notebooks/08_ascent_trigger_examples.ipynb @@ -164,11 +164,52 @@ "source": [ "print(info[\"expressions\"].to_yaml())" ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Exercise\n", + "\n", + "Create your own trigger that sets up a scene with two renders (as in notebook 4) at cycle 1000.\n", + "\n", + "**First**, refactor the code from Trigger Example 1 to have a single trigger at cycle 1000.\n", + "\n", + "**Second**, create a new actions file or prepare to edit `cycle_trigger_actions.yaml`. Make sure your trigger is using the correct actions file.\n", + "\n", + "**Third**, edit your actions .yaml file to include two renders, as in notebook 4's \"Scene Example 3\". One render can use an azimuth angle of 10 degrees and the other a 3x zoom.\n", + "\n", + "**Fourth**, use `ascent.jupyter.AscentImageSequenceViewer` as above to plot the two .png files created by your trigger.\n" + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Exercise solution\n", + "Run the cell below once to see solutions and twice to run them." + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [ + "%load solutions/exercise8.py" + ] } ], "metadata": { "kernelspec": { - "display_name": "Python 3", + "display_name": "Python 3 (ipykernel)", "language": "python", "name": "python3" }, @@ -182,9 +223,9 @@ "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", - "version": "3.7.6" + "version": "3.9.13" } }, "nbformat": 4, - "nbformat_minor": 2 + "nbformat_minor": 4 } diff --git a/src/examples/tutorial/ascent_intro/notebooks/09_ascent_binning_examples.ipynb b/src/examples/tutorial/ascent_intro/notebooks/09_ascent_binning_examples.ipynb index 7db705216..ed7362807 100644 --- a/src/examples/tutorial/ascent_intro/notebooks/09_ascent_binning_examples.ipynb +++ b/src/examples/tutorial/ascent_intro/notebooks/09_ascent_binning_examples.ipynb @@ -254,11 +254,53 @@ "plt.xlabel('z position')\n", "plt.ylabel('max radial')" ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Exercise\n", + "\n", + "**First**, swap out “radial” for “braid” in each of the queries for Binning Example 1 such as\n", + "\n", + "```\n", + "queries[\"q1/params/expression\"] = \"binning('radial','max', [axis('x',num_bins=20)])\";\n", + "```\n", + "\n", + "Run the resulting code to see how this modifies the final plots.\n", + "\n", + "**Second**, copy and modify the existing code for 1D binning projected along the x axis. Your modified code should \n", + "create a fourth query that 1D bins along the y axis and plot the result. \n" + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Exercise solution\n", + "Run the cell below once to see solutions and twice to run them." + ] + }, + { + "cell_type": "code", + "execution_count": null, + "metadata": {}, + "outputs": [], + "source": [ + "%load solutions/exercise9.py" + ] } ], "metadata": { "kernelspec": { - "display_name": "Python 3", + "display_name": "Python 3 (ipykernel)", "language": "python", "name": "python3" }, @@ -272,7 +314,7 @@ "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython3", - "version": "3.6.3" + "version": "3.9.13" } }, "nbformat": 4, diff --git a/src/examples/tutorial/ascent_intro/notebooks/10_ascent_extra_examples.ipynb b/src/examples/tutorial/ascent_intro/notebooks/10_ascent_extra_examples.ipynb new file mode 100644 index 000000000..7b10825f7 --- /dev/null +++ b/src/examples/tutorial/ascent_intro/notebooks/10_ascent_extra_examples.ipynb @@ -0,0 +1,765 @@ +{ + "cells": [ + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "# Extra Ascent Action Examples\n", + "Extra Ascent action examples to showcase different capabilities. See Ascent's [Pipelines](https://ascent.readthedocs.io/en/latest/Actions/Pipelines.html) docs for deeper details on Pipelines." + ] + }, + { + "cell_type": "code", + "execution_count": 73, + "metadata": {}, + "outputs": [], + "source": [ + "# ascent + conduit imports\n", + "import conduit\n", + "import conduit.blueprint\n", + "import ascent\n", + "\n", + "import numpy as np\n", + "\n", + "# cleanup any old results\n", + "!./cleanup.sh" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "### Create an example mesh to feed to Ascent" + ] + }, + { + "cell_type": "code", + "execution_count": 74, + "metadata": {}, + "outputs": [], + "source": [ + "# create example mesh using the conduit blueprint braid helper\n", + "mesh = conduit.Node()\n", + "conduit.blueprint.mesh.examples.braid(\"hexs\",\n", + " 25,\n", + " 25,\n", + " 25,\n", + " mesh)" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Extra Example 1:\n", + "### Vector Component filter to extract scalar component of a vector field" + ] + }, + { + "cell_type": "code", + "execution_count": 75, + "metadata": {}, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "- \n", + " action: \"add_pipelines\"\n", + " pipelines: \n", + " pl1: \n", + " f1: \n", + " type: \"vector_component\"\n", + " params: \n", + " field: \"vel\"\n", + " component: 0\n", + " output_name: \"my_comp_vec\"\n", + "- \n", + " action: \"add_scenes\"\n", + " scenes: \n", + " s1: \n", + " plots: \n", + " p1: \n", + " type: \"pseudocolor\"\n", + " pipeline: \"pl1\"\n", + " field: \"my_comp_vec\"\n", + " image_name: \"out_pipeline_vec_comp_0\"\n", + "\n" + ] + } + ], + "source": [ + "a = ascent.Ascent()\n", + "a.open()\n", + "\n", + "# publish our mesh to ascent\n", + "a.publish(mesh);\n", + "\n", + "# setup actions\n", + "actions = conduit.Node()\n", + "add_act = actions.append()\n", + "add_act[\"action\"] = \"add_pipelines\"\n", + "pipelines = add_act[\"pipelines\"]\n", + "\n", + "# create a pipeline (pl1) with a vector component filter (f1)\n", + "pipelines[\"pl1/f1/type\"] = \"vector_component\"\n", + "\n", + "# extract vector component params\n", + "vec_comp_params = pipelines[\"pl1/f1/params\"]\n", + "vec_comp_params[\"field\"] = \"vel\"\n", + "vec_comp_params[\"component\"] = 0\n", + "vec_comp_params[\"output_name\"] = \"my_comp_vec\"\n", + "\n", + "# declare a scene to render the pipeline result\n", + "\n", + "add_act2 = actions.append()\n", + "add_act2[\"action\"] = \"add_scenes\"\n", + "scenes = add_act2[\"scenes\"]\n", + "\n", + "# add a scene (s1) with one pseudocolor plot (p1) that \n", + "# will render the result of our pipeline (pl1)\n", + "scenes[\"s1/plots/p1/type\"] = \"pseudocolor\"\n", + "scenes[\"s1/plots/p1/pipeline\"] = \"pl1\"\n", + "scenes[\"s1/plots/p1/field\"] = \"my_comp_vec\"\n", + "# set the output file name (ascent will add \".png\")\n", + "scenes[\"s1/image_name\"] = \"out_pipeline_vec_comp_0\"\n", + "\n", + "# print our full actions tree\n", + "print(actions.to_yaml())\n", + "\n", + "# execute the actions\n", + "a.execute(actions)" + ] + }, + { + "cell_type": "code", + "execution_count": 76, + "metadata": {}, + "outputs": [ + { + "data": { + "application/vnd.jupyter.widget-view+json": { + "model_id": "ee809d1efed242b299d803611aea382d", + "version_major": 2, + "version_minor": 0 + }, + "text/plain": [ + "VBox(children=(Tab(children=(VBox(children=(Image(value=b'\\x89PNG\\r\\n\\x1a\\n\\x00\\x00\\x00\\rIHDR\\x00\\x00\\x04\\x00\\…" + ] + }, + "execution_count": 76, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "# show the resulting image\n", + "ascent.jupyter.AscentViewer(a).show()" + ] + }, + { + "cell_type": "code", + "execution_count": 77, + "metadata": {}, + "outputs": [], + "source": [ + "#close ascent\n", + "a.close()" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Extra Example 2:\n", + "### Create two renders for one scene, one of them specifying all camera parameters" + ] + }, + { + "cell_type": "code", + "execution_count": 78, + "metadata": {}, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "- \n", + " action: \"add_scenes\"\n", + " scenes: \n", + " s1: \n", + " plots: \n", + " p1: \n", + " type: \"volume\"\n", + " field: \"braid\"\n", + " color_table: \n", + " name: \"blue\"\n", + " control_points: \n", + " - \n", + " type: \"rgb\"\n", + " position: 0.0\n", + " color: [1.0, 0.0, 0.0]\n", + " - \n", + " type: \"rgb\"\n", + " position: 0.5\n", + " color: [0.0, 1.0, 0.0]\n", + " - \n", + " type: \"rgb\"\n", + " position: 1.0\n", + " color: [1.0, 1.0, 1.0]\n", + " - \n", + " type: \"alpha\"\n", + " position: 0.0\n", + " alpha: 0.0\n", + " - \n", + " type: \"alpha\"\n", + " position: 1.0\n", + " alpha: 1.0\n", + " image_name: \"out_pipeline_color_test\"\n", + " renders: \n", + " r1: \n", + " image_width: 512\n", + " image_height: 512\n", + " image_prefix: \"out_extra_renders_r1_simple\"\n", + " r2: \n", + " image_width: 400\n", + " image_height: 400\n", + " image_prefix: \"out_extra_renders_r2_cam_params\"\n", + " camera: \n", + " look_at: [1.0, 1.0, 1.0]\n", + " position: [0.0, 25.0, 15.0]\n", + " up: [0.0, -1.0, 0.0]\n", + " fov: 60.0\n", + " xpan: 0.0\n", + " ypan: 0.0\n", + " zoom: 1.0\n", + " azimuth: 10.0\n", + " elevation: -10.0\n", + " near_plane: 0.1\n", + " far_plane: 100.1\n", + "\n" + ] + } + ], + "source": [ + "a = ascent.Ascent()\n", + "a.open()\n", + "\n", + "# publish mesh to ascent\n", + "a.publish(mesh);\n", + "\n", + "# setup actions\n", + "actions = conduit.Node()\n", + "\n", + "# declare a scene to render \n", + "add_act = actions.append()\n", + "add_act[\"action\"] = \"add_scenes\"\n", + "scenes = add_act[\"scenes\"]\n", + "\n", + "# add a scene (s1) with one volume plot (p1) \n", + "scenes[\"s1/plots/p1/type\"] = \"volume\"\n", + "scenes[\"s1/plots/p1/field\"] = \"braid\"\n", + "# change color table\n", + "scenes[\"s1/plots/p1/color_table/name\"] = \"blue\"\n", + "# add color table control points \n", + "control_points = scenes[\"s1/plots/p1/color_table/control_points\"]\n", + "# control point 1\n", + "control_points1 = control_points.append()\n", + "control_points1[\"type\"] = \"rgb\"\n", + "control_points1[\"position\"] = 0.0\n", + "color1 = np.array([1.0,0.0,0.0],dtype=np.float32)\n", + "control_points1[\"color\"].set(color1)\n", + "# control point 2\n", + "control_points2 = control_points.append()\n", + "control_points2[\"type\"] = \"rgb\"\n", + "control_points2[\"position\"] = 0.5\n", + "color2 = np.array([0.0,1.0,0.0],dtype=np.float32)\n", + "control_points2[\"color\"].set(color2)\n", + "# control point 3\n", + "control_points3 = control_points.append()\n", + "control_points3[\"type\"] = \"rgb\"\n", + "control_points3[\"position\"] = 1.0\n", + "color3 = np.array([1.0,1.0,1.0],dtype=np.float32)\n", + "control_points3[\"color\"].set(color3)\n", + "# set alpha control point 1\n", + "control_points4 = control_points.append()\n", + "control_points4[\"type\"] = \"alpha\"\n", + "control_points4[\"position\"] = 0.0\n", + "control_points4[\"alpha\"] = 0.0\n", + "# set alpha control point 2\n", + "control_points5 = control_points.append()\n", + "control_points5[\"type\"] = \"alpha\"\n", + "control_points5[\"position\"] = 1.0\n", + "control_points5[\"alpha\"] = 1.0\n", + "\n", + "# set the output file name -- ignored due to specifying renders\n", + "scenes[\"s1/image_name\"] = \"out_pipeline_color_test\"\n", + "# add renders to specify params\n", + "renders = scenes[\"s1/renders\"]\n", + "# set render 1 (r1) simple\n", + "renders[\"r1/image_width\"] = 512 \n", + "renders[\"r1/image_height\"] = 512 \n", + "renders[\"r1/image_prefix\"] = \"out_extra_renders_r1_simple\"\n", + "# set render 2 (r2) with all camera params\n", + "renders[\"r2/image_width\"] = 400 \n", + "renders[\"r2/image_height\"] = 400 \n", + "renders[\"r2/image_prefix\"] = \"out_extra_renders_r2_cam_params\"\n", + "# set camera params for r2\n", + "r2_camera = renders[\"r2/camera\"]\n", + "look_at = np.array([1.0,1.0,1.0],dtype=np.float64)\n", + "r2_camera[\"look_at\"].set(look_at)\n", + "pos = np.array([0.0,25.0,15.0],dtype=np.float64)\n", + "r2_camera[\"position\"].set(pos)\n", + "up = np.array([0.0,-1.0,0.0],dtype=np.float64)\n", + "r2_camera[\"up\"].set(up)\n", + "r2_camera[\"fov\"] = 60.0\n", + "r2_camera[\"xpan\"] = 0.0\n", + "r2_camera[\"ypan\"] = 0.0\n", + "r2_camera[\"zoom\"] = 1.0\n", + "r2_camera[\"azimuth\"] = 10.0\n", + "r2_camera[\"elevation\"] = -10.0\n", + "r2_camera[\"near_plane\"] = 0.1\n", + "r2_camera[\"far_plane\"] = 100.1\n", + "\n", + "# print our full actions tree\n", + "print(actions.to_yaml())\n", + "\n", + "# execute\n", + "a.execute(actions)" + ] + }, + { + "cell_type": "code", + "execution_count": 79, + "metadata": {}, + "outputs": [ + { + "data": { + "application/vnd.jupyter.widget-view+json": { + "model_id": "f9278fe369ba447e9f2cd1b034dee67e", + "version_major": 2, + "version_minor": 0 + }, + "text/plain": [ + "VBox(children=(Tab(children=(VBox(children=(Image(value=b'\\x89PNG\\r\\n\\x1a\\n\\x00\\x00\\x00\\rIHDR\\x00\\x00\\x02\\x00\\…" + ] + }, + "execution_count": 79, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "# show the resulting image\n", + "ascent.jupyter.AscentViewer(a).show()" + ] + }, + { + "cell_type": "code", + "execution_count": 80, + "metadata": {}, + "outputs": [], + "source": [ + "# close ascent\n", + "a.close()" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Extra Example 3:\n", + "### Apply and render a histogram-based sampling filter" + ] + }, + { + "cell_type": "code", + "execution_count": 81, + "metadata": {}, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "- \n", + " action: \"add_pipelines\"\n", + " pipelines: \n", + " pl1: \n", + " f1: \n", + " type: \"histsampling\"\n", + " params: \n", + " field: \"radial\"\n", + " sample_rate: 0.1\n", + " bins: 32\n", + "- \n", + " action: \"add_scenes\"\n", + " scenes: \n", + " s1: \n", + " plots: \n", + " p1: \n", + " type: \"pseudocolor\"\n", + " pipeline: \"pl1\"\n", + " field: \"braid\"\n", + " image_name: \"out_extra_histsampling\"\n", + "\n" + ] + } + ], + "source": [ + "a = ascent.Ascent()\n", + "a.open()\n", + "\n", + "# publish mesh to ascent\n", + "a.publish(mesh);\n", + "\n", + "# setup actions\n", + "actions = conduit.Node()\n", + "add_act = actions.append()\n", + "add_act[\"action\"] = \"add_pipelines\"\n", + "pipelines = add_act[\"pipelines\"]\n", + "\n", + "# create our first pipeline (pl1) \n", + "# with a histsampling filter (f1)\n", + "pipelines[\"pl1/f1/type\"] = \"histsampling\"\n", + "# sample the braid field values\n", + "# using 32 bins and sample rate of 0.1\n", + "histsamp_params = pipelines[\"pl1/f1/params\"]\n", + "#histsamp_params[\"field\"] = \"braid\"\n", + "histsamp_params[\"field\"] = \"radial\"\n", + "histsamp_params[\"sample_rate\"] = 0.1\n", + "histsamp_params[\"bins\"] = 32\n", + "\n", + "# declare a scene to render our pipeline results\n", + "add_act2 = actions.append()\n", + "add_act2[\"action\"] = \"add_scenes\"\n", + "scenes = add_act2[\"scenes\"]\n", + "\n", + "# plot (p1) to render our first pipeline (pl1)\n", + "scenes[\"s1/plots/p1/type\"] = \"pseudocolor\"\n", + "scenes[\"s1/plots/p1/pipeline\"] = \"pl1\"\n", + "#scenes[\"s1/plots/p1/field\"] = \"radial\"\n", + "scenes[\"s1/plots/p1/field\"] = \"braid\"\n", + "\n", + "# set the output file name (ascent will add \".png\")\n", + "scenes[\"s1/image_name\"] = \"out_extra_histsampling\"\n", + "\n", + "# print our full actions tree\n", + "print(actions.to_yaml())\n", + "\n", + "# execute\n", + "a.execute(actions)" + ] + }, + { + "cell_type": "code", + "execution_count": 82, + "metadata": {}, + "outputs": [ + { + "data": { + "application/vnd.jupyter.widget-view+json": { + "model_id": "b69538a4fcc449a0b9b2b9bbaea241dc", + "version_major": 2, + "version_minor": 0 + }, + "text/plain": [ + "VBox(children=(Tab(children=(VBox(children=(Image(value=b'\\x89PNG\\r\\n\\x1a\\n\\x00\\x00\\x00\\rIHDR\\x00\\x00\\x04\\x00\\…" + ] + }, + "execution_count": 82, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "# show the resulting image\n", + "ascent.jupyter.AscentViewer(a).show()" + ] + }, + { + "cell_type": "code", + "execution_count": 83, + "metadata": {}, + "outputs": [], + "source": [ + "# close ascent\n", + "a.close()" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Extra Example 4:\n", + "### Custom render background and foreground colors" + ] + }, + { + "cell_type": "code", + "execution_count": 85, + "metadata": {}, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "- \n", + " action: \"add_scenes\"\n", + " scenes: \n", + " s1: \n", + " plots: \n", + " p1: \n", + " type: \"pseudocolor\"\n", + " field: \"braid\"\n", + " renders: \n", + " r1: \n", + " image_prefix: \"out_extra_bg_fg_color\"\n", + " bg_color: [1.0, 1.0, 1.0]\n", + " fg_color: [0.0, 0.0, 0.0]\n", + "\n" + ] + } + ], + "source": [ + "# Add custom background and foreground colors\n", + "a = ascent.Ascent()\n", + "a.open()\n", + "\n", + "# publish mesh to ascent\n", + "a.publish(mesh);\n", + "\n", + "# setup actions\n", + "actions = conduit.Node()\n", + "\n", + "# add scene\n", + "add_act = actions.append()\n", + "add_act[\"action\"] = \"add_scenes\"\n", + "scenes = add_act[\"scenes\"]\n", + "\n", + "scenes[\"s1/plots/p1/type\"] = \"pseudocolor\"\n", + "#scenes[\"s1/plots/p1/field\"] = \"radial\"\n", + "scenes[\"s1/plots/p1/field\"] = \"braid\"\n", + "# specify background and foreground colors in renders\n", + "renders = scenes[\"s1/renders\"]\n", + "renders[\"r1/image_prefix\"] = \"out_extra_bg_fg_color\"\n", + "# background color\n", + "bg = np.array([1.0,1.0,1.0],dtype=np.float32)\n", + "renders[\"r1/bg_color\"].set(bg)\n", + "# foreground color\n", + "fg = np.array([0.0,0.0,0.0],dtype=np.float32)\n", + "renders[\"r1/fg_color\"].set(fg)\n", + "\n", + "# print our full actions tree\n", + "print(actions.to_yaml())\n", + "\n", + "# execute\n", + "a.execute(actions)" + ] + }, + { + "cell_type": "code", + "execution_count": 86, + "metadata": {}, + "outputs": [ + { + "data": { + "application/vnd.jupyter.widget-view+json": { + "model_id": "dd513d94ea3c4538b48a4c057e057072", + "version_major": 2, + "version_minor": 0 + }, + "text/plain": [ + "VBox(children=(Tab(children=(VBox(children=(Image(value=b'\\x89PNG\\r\\n\\x1a\\n\\x00\\x00\\x00\\rIHDR\\x00\\x00\\x04\\x00\\…" + ] + }, + "execution_count": 86, + "metadata": {}, + "output_type": "execute_result" + } + ], + "source": [ + "# show the resulting image\n", + "ascent.jupyter.AscentViewer(a).show()" + ] + }, + { + "cell_type": "code", + "execution_count": 54, + "metadata": {}, + "outputs": [], + "source": [ + "# close ascent\n", + "a.close()" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Extra Example 5:\n", + "### Trigger with no trigger actions file" + ] + }, + { + "cell_type": "code", + "execution_count": 88, + "metadata": {}, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "- \n", + " action: \"add_triggers\"\n", + " triggers: \n", + " t1: \n", + " params: \n", + " condition: \"magnitude(max(field('braid')).position - vector(0,0,0)) > 0\"\n", + " actions: \n", + " - \n", + " action: \"add_scenes\"\n", + " scenes: \n", + " s1: \n", + " plots: \n", + " p1: \n", + " type: \"pseudocolor\"\n", + " field: \"braid\"\n", + " image_name: \"out_extra_inplace_trigger\"\n", + "\n" + ] + } + ], + "source": [ + "# Use triggers to render when conditions occur without actions file\n", + "a = ascent.Ascent()\n", + "a.open()\n", + "\n", + "# publish mesh to ascent\n", + "a.publish(mesh);\n", + "\n", + "# set up actions\n", + "actions = conduit.Node()\n", + "\n", + "# declare triggers \n", + "add_triggers = actions.append()\n", + "add_triggers[\"action\"] = \"add_triggers\"\n", + "triggers = add_triggers[\"triggers\"] \n", + "triggers[\"t1/params/condition\"] = \"magnitude(max(field('braid')).position - vector(0,0,0)) > 0\"\n", + "# create in-place trigger action\n", + "trigger_actions = triggers[\"t1/params/actions\"].append()\n", + "# plot when trigger fires\n", + "trigger_actions[\"action\"] = \"add_scenes\"\n", + "scenes = trigger_actions[\"scenes\"]\n", + "scenes[\"s1/plots/p1/type\"] = \"pseudocolor\"\n", + "#scenes[\"s1/plots/p1/field\"] = \"radial\"\n", + "scenes[\"s1/plots/p1/field\"] = \"braid\"\n", + "\n", + "# set the output file name (ascent will add \".png\")\n", + "scenes[\"s1/image_name\"] = \"out_extra_inplace_trigger\"\n", + "\n", + "# print our full actions tree\n", + "print(actions.to_yaml())\n", + "\n", + "# execute\n", + "a.execute(actions)" + ] + }, + { + "cell_type": "code", + "execution_count": 89, + "metadata": {}, + "outputs": [ + { + "data": { + "application/vnd.jupyter.widget-view+json": { + "model_id": "98fa2df99106416d89fb58bc6d021d4b", + "version_major": 2, + "version_minor": 0 + }, + "text/plain": [ + "VBox(children=(Tab(children=(HTML(value='
\\nmagnitude(max(field(\\'braid\\')).position - vector(0,0,0)) > 0:…"
+      ]
+     },
+     "execution_count": 89,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "# show the resulting trigger info\n",
+    "ascent.jupyter.AscentViewer(a).show()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 54,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# close ascent\n",
+    "a.close()"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Exercise\n",
+    "\n",
+    "**First**, copy the code from notebook 8 and paste below. Re-run this code to refresh your memory of the output.\n",
+    "\n",
+    "**Second** refactor this code so that you get the same output as notebook 8 but *without* using the trigger files \"cycle_trigger_actions.yaml\" or \"entropy_trigger_actions.yaml\"."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Exercise solution\n",
+    "Run the cell below once to see solutions and twice to run them."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "%load solutions/exercise10.py"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.9.13"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 4
+}
diff --git a/src/examples/tutorial/ascent_intro/notebooks/solution_notebook8.yaml b/src/examples/tutorial/ascent_intro/notebooks/solution_notebook8.yaml
new file mode 100644
index 000000000..21b5b9c03
--- /dev/null
+++ b/src/examples/tutorial/ascent_intro/notebooks/solution_notebook8.yaml
@@ -0,0 +1,17 @@
+-
+  action: "add_scenes"
+  scenes:
+    s1:
+      plots:
+        p1:
+          type: "pseudocolor"
+          field: "gyre"
+      renders:
+        r1:
+          camera:
+            azimuth: 10.0
+          image_name: "cycle_trigger_out_r1"
+        r2:
+          camera:
+            zoom: 3.0
+          image_name: "cycle_trigger_out_r2"
diff --git a/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise1.py b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise1.py
new file mode 100644
index 000000000..4d05eff5a
--- /dev/null
+++ b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise1.py
@@ -0,0 +1,94 @@
+
+"""
+# Exercise 1 prompts:
+First, change the "field" name for this dataset from "braid" to "radial" and re-plot the image.
+
+Second, observe how the image generated changes as you decrease the number of points on the mesh. For example, move from a 50x50x50 mesh to a 15x15x15 mesh.
+
+
+# Changes to the code:
+(1) `scenes["s1/plots/p1/field"] = "braid"` is updated to `scenes["s1/plots/p1/field"] = "radial"
+`
+
+(2)
+The line below is updated from a 50x50x50 mesh to a 15x15x15 mesh.
+
+```
+conduit.blueprint.mesh.examples.braid("hexs",
+                                       15,
+                                       15,
+                                       15,
+                                       mesh)
+```
+
+"""
+
+# conduit + ascent imports
+import conduit
+import conduit.blueprint
+import ascent
+
+# cleanup any old results
+!./cleanup.sh
+
+mesh = conduit.Node()
+conduit.blueprint.mesh.examples.braid("hexs",
+                                      15,
+                                      15,
+                                      15,
+                                      mesh)
+
+
+# create an Ascent instance
+a = ascent.Ascent()
+
+# set options to allow errors propagate to python
+ascent_opts = conduit.Node()
+ascent_opts["exceptions"] = "forward"
+
+#
+# open ascent
+#
+a.open(ascent_opts)
+
+#
+# publish mesh data to ascent
+#
+a.publish(mesh)
+
+#
+# Ascent's interface accepts "actions" 
+# that to tell Ascent what to execute
+#
+actions = conduit.Node()
+
+# Create an action that tells Ascent to:
+#  add a scene (s1) with one plot (p1)
+#  that will render a pseudocolor of 
+#  the mesh field `braid`
+add_act = actions.append()
+add_act["action"] = "add_scenes"
+
+# declare a scene (s1) and pseudocolor plot (p1)
+scenes = add_act["scenes"]
+
+# things to explore:
+#  changing plot type (mesh)
+#  changing field name (for this dataset: radial)
+scenes["s1/plots/p1/type"] = "pseudocolor"
+scenes["s1/plots/p1/field"] = "radial"
+
+# set the output file name (ascent will add ".png")
+scenes["s1/image_name"] = "out_first_light_render_3d"
+
+# view our full actions tree
+print(actions.to_yaml())
+
+# execute the actions
+a.execute(actions)
+
+# show the result from our scene using the AscentViewer widget
+ascent.jupyter.AscentViewer(a).show()
+
+## close ascent
+# a.close()
\ No newline at end of file
diff --git a/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise10.py b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise10.py
new file mode 100644
index 000000000..72321c6a8
--- /dev/null
+++ b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise10.py
@@ -0,0 +1,111 @@
+"""
+# Exercise 10 prompts:
+
+First, copy the code from notebook 8 and paste below. Re-run this code to refresh your memory of the output.
+
+Second refactor this code so that you get the same output as notebook 8 but without using the trigger files "cycle_trigger_actions.yaml" or "entropy_trigger_actions.yaml".
+
+"""
+# cleanup any old results
+!./cleanup.sh
+
+# ascent + conduit imports
+import conduit
+import conduit.blueprint
+import ascent
+
+import numpy as np
+
+# helpers we use to create tutorial data
+from ascent_tutorial_jupyter_utils import img_display_width
+from ascent_tutorial_jupyter_utils import tutorial_gyre_example
+
+import matplotlib.pyplot as plt
+
+
+# Use triggers to render when conditions occur
+a = ascent.Ascent()
+a.open()
+
+# setup actions
+actions = conduit.Node()
+
+# declare a question to ask 
+add_queries = actions.append()
+add_queries["action"] = "add_queries"
+
+# add our entropy query (q1)
+queries = add_queries["queries"] 
+queries["q1/params/expression"] = "entropy(histogram(field('gyre'), num_bins=128))"
+queries["q1/params/name"] = "entropy"
+
+# declare triggers 
+add_triggers = actions.append()
+add_triggers["action"] = "add_triggers"
+triggers = add_triggers["triggers"] 
+
+# add a simple trigger (t1_ that fires at cycle 500
+triggers["t1/params/condition"] = "cycle() == 500"
+# triggers["t1/params/actions_file"] = "cycle_trigger_actions.yaml" # replace this file:
+trigger_actions = triggers["t1/params/actions"].append()
+# plot when trigger fires
+trigger_actions["action"] = "add_scenes"
+scenes = trigger_actions["scenes"]
+scenes["s1/plots/p1/type"] = "pseudocolor"
+scenes["s1/plots/p1/field"] = "gyre"
+# set the output file name (ascent will add ".png")
+scenes["s1/image_name"] = "cycle_trigger_out_"
+
+# add trigger (t2) that fires when the change in entroy exceeds 0.5
+
+# the history function allows you to access query results of previous
+# cycles. relative_index indicates how far back in history to look.
+
+# Looking at the plot of gyre entropy in the previous notebook, we see a jump
+# in entropy at cycle 200, so we expect the trigger to fire at cycle 200
+triggers["t2/params/condition"] = "entropy - history(entropy, relative_index = 1) > 0.5"
+# triggers["t2/params/actions_file"] = "entropy_trigger_actions.yaml" # replace with the following:
+trigger2_actions = triggers["t2/params/actions"].append()
+trigger2_actions["action"] = "add_scenes"
+scenes2 = trigger2_actions["scenes"]
+scenes2["s1/plots/p1/type"] = "pseudocolor"
+scenes2["s1/plots/p1/field"] = "gyre"
+# set the output file name (ascent will add ".png")
+scenes2["s1/image_name"] = "entropy_trigger_out_"
+
+# view our full actions tree
+print(actions.to_yaml())
+
+# gyre time varying params
+nsteps = 10
+time = 0.0
+delta_time = 0.5
+
+for step in range(nsteps):
+    # call helper that generates a double gyre time varying example mesh.
+    # gyre ref :https://shaddenlab.berkeley.edu/uploads/LCS-tutorial/examples.html
+    mesh = tutorial_gyre_example(time)
+    
+    # update the example cycle
+    cycle = 100 + step * 100
+    mesh["state/cycle"] = cycle
+    print("time: {} cycle: {}".format(time,cycle))
+    
+    # publish mesh to ascent
+    a.publish(mesh)
+    
+    # execute the actions
+    a.execute(actions)
+    
+    # update time
+    time = time + delta_time
+
+# retrieve the info node that contains the trigger and query results
+info = conduit.Node()
+a.info(info)
+
+# close ascent
+a.close()
+
+# show the result image from the cycle trigger
+ascent.jupyter.AscentImageSequenceViewer(["cycle_trigger_out_500.png", "entropy_trigger_out_200.png"]).show()
\ No newline at end of file
diff --git a/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise2.py b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise2.py
new file mode 100644
index 000000000..d1bfa0b59
--- /dev/null
+++ b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise2.py
@@ -0,0 +1,57 @@
+
+"""
+# Exercise 2 prompts:
+
+**First**, create a tree with the following format:
+
+```
+animals: 
+  carnivores: 
+    - "cat"
+  herbivores: 
+    - "koala"
+    - "sloth"
+  omnivores: 
+    - "dog"
+    - "human"
+```
+
+Hint: You'll have to use lists.
+
+**Second**
+
+Add "bear" to the list of omnivores in `animals` so that the tree looks like
+
+```
+animals: 
+  carnivores: 
+    - "cat"
+  herbivores: 
+    - "koala"
+    - "sloth"
+  omnivores: 
+    - "dog"
+    - "human"
+    - "bear"
+```
+
+Here you'll use the `set` method introduced above! See [these docs](https://llnl-conduit.readthedocs.io/en/latest/tutorial_python_basics.html) for help.
+
+"""
+
+# conduit + ascent imports
+import conduit
+
+# cleanup any old results
+!./cleanup.sh
+
+# Create the initial `animals` tree
+animals = conduit.Node()
+animals["animals/carnivores"] = ["cat"];
+animals["animals/herbivores"] = ["koala", "sloth"];
+animals["animals/omnivores"] = ["dog", "human"];
+print(animals.to_yaml()) 
+
+# Add "bear" to the list of omnivores
+animals["animals/omnivores"].append().set("bear")
+print(animals.to_yaml()) 
diff --git a/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise3.py b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise3.py
new file mode 100644
index 000000000..f6b0e9a82
--- /dev/null
+++ b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise3.py
@@ -0,0 +1,148 @@
+
+"""
+# Exercise 3 prompts:
+
+Use/alter the code from Mesh Blueprint Example 1 to create a scene with two plots: two versions of the alternating field on a uniform grid -- one with an origin at (-10,-10,-10) and one with an origin at (0,0,0).
+
+**First**, add a second coordinate set to `mesh` and call it `mycoords`. `mycoords` will have the same properties as `coords` except for the difference in origin.
+
+**Second**, add a second topology to `mesh` and call it `mytopo`. `mytopo` will have the same properties as `topo` except that its coordinate set will be `mycoords` instead of `coords`.
+
+**Third**, add a second field to `mesh` and call it `myalternating`. `myalternating` will have the same properties as `alternating` except that its topology will be `mytopo` instead of `topo`.
+
+**Fourth** add a second plot (`p2`) to the scene `s1`. `p1` will still plot the field `alternating` and `p2` should plot `myalternating`.
+
+Finally, use AscentViewer to plot the result.
+"""
+
+# conduit + ascent imports
+import conduit
+import conduit.blueprint
+import ascent
+
+import math
+import numpy as np
+
+# cleanup any old results
+!./cleanup.sh
+
+#
+# Create a 3D mesh defined on a uniform grid of points
+# with two vertex associated fields named `alternating` and `myalternating`
+#
+
+mesh = conduit.Node()
+
+# Create the coordinate sets
+
+# Create the first, original coordinate set
+num_per_dim = 9
+mesh["coordsets/coords/type"] = "uniform";
+mesh["coordsets/coords/dims/i"] = num_per_dim
+mesh["coordsets/coords/dims/j"] = num_per_dim
+mesh["coordsets/coords/dims/k"] = num_per_dim
+
+# add origin and spacing to the coordset (optional)
+mesh["coordsets/coords/origin/x"] = -10.0
+mesh["coordsets/coords/origin/y"] = -10.0
+mesh["coordsets/coords/origin/z"] = -10.0
+
+distance_per_step = 20.0/(num_per_dim-1)
+
+mesh["coordsets/coords/spacing/dx"] = distance_per_step
+mesh["coordsets/coords/spacing/dy"] = distance_per_step
+mesh["coordsets/coords/spacing/dz"] = distance_per_step
+
+# Create the second coordinate set, `mycoords`, with the same dimensions and spacing
+mesh["coordsets/mycoords/type"] = "uniform";
+mesh["coordsets/mycoords/dims/i"] = num_per_dim
+mesh["coordsets/mycoords/dims/j"] = num_per_dim
+mesh["coordsets/mycoords/dims/k"] = num_per_dim
+
+mesh["coordsets/mycoords/spacing/dx"] = distance_per_step
+mesh["coordsets/mycoords/spacing/dy"] = distance_per_step
+mesh["coordsets/mycoords/spacing/dz"] = distance_per_step
+
+# add an origin at (0,0,0) instead of (-10,-10,-10)
+mesh["coordsets/mycoords/origin/x"] = 0.0
+mesh["coordsets/mycoords/origin/y"] = 0.0
+mesh["coordsets/mycoords/origin/z"] = 0.0
+
+# Create topologies
+
+# add the topologies that will be used for each field
+# Create the first topology, topo, which uses the coordinate set coords
+mesh["topologies/topo/type"] = "uniform";
+# reference the coordinate set by name, coords
+mesh["topologies/topo/coordset"] = "coords";
+
+# Create the second topology, mytopo, which uses the coordinate set mycoords
+mesh["topologies/mytopo/type"] = "uniform";
+# reference the secoond coordinate set by name, mycoords
+mesh["topologies/mytopo/coordset"] = "mycoords";
+
+# Create two fields named alternating and myalternating
+
+# Generate the data that will be plotted at the vertices on the mesh
+num_vertices = num_per_dim * num_per_dim * num_per_dim
+vals = np.zeros(num_vertices,dtype=np.float32)
+for i in range(num_vertices):
+    if i%2:
+        vals[i] = 0.0
+    else:
+        vals[i] = 1.0
+
+# Create the first vertex-associated field, alternating, 
+# using the original topology, topo
+mesh["fields/alternating/association"] = "vertex";
+mesh["fields/alternating/topology"] = "topo";
+mesh["fields/alternating/values"].set_external(vals)
+
+# Create the second vertex-associated field, alternating, 
+# using mytopo (and thereby mycoords)
+mesh["fields/myalternating/association"] = "vertex";
+mesh["fields/myalternating/topology"] = "mytopo";
+mesh["fields/myalternating/values"].set_external(vals)
+
+# Print the mesh
+print(mesh.to_yaml())
+
+# Verify the mesh conforms to the blueprint
+verify_info = conduit.Node()
+if not conduit.blueprint.mesh.verify(mesh,verify_info):
+    print("Mesh Verify failed!")
+    print(verify_info.to_yaml())
+else:
+    print("Mesh verify success!")
+
+# Finally, let's plot both fields using Ascent
+# We'll create one scene with two plots
+a = ascent.Ascent()
+a.open()
+
+# publish mesh to ascent
+a.publish(mesh)
+
+# setup actions
+actions = conduit.Node()
+add_act = actions.append();
+add_act["action"] = "add_scenes";
+
+# declare a scene (s1) with one plot (p1) 
+# to render the dataset
+scenes = add_act["scenes"]
+# First plot alternating
+scenes["s1/plots/p1/type"] = "pseudocolor"
+scenes["s1/plots/p1/field"] = "alternating"
+# Add a second plot for myalternating
+scenes["s1/plots/p2/type"] = "pseudocolor"
+scenes["s1/plots/p2/field"] = "myalternating"
+
+# Set the output file name (ascent will add ".png")
+scenes["s1/image_name"] = "out_ascent_render_uniform"
+
+# execute the actions
+a.execute(actions)
+
+# show the result using the AscentViewer widget
+ascent.jupyter.AscentViewer(a).show()
\ No newline at end of file
diff --git a/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise4.py b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise4.py
new file mode 100644
index 000000000..11b23def6
--- /dev/null
+++ b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise4.py
@@ -0,0 +1,85 @@
+"""
+# Exercise 4 prompts:
+
+Use and modify the code from Scene Example 3 ("Adjusting camera parameters").
+Change the color scheme to Viridis and rotate the view of the tet example
+360 degrees. 
+
+**First**, update the name of the color table as in Example 4.
+
+**Second**, create 37 renders of `s1` with azimuth angles [0, 10, 20, 30, .... 360]
+
+Note: the following Python syntax for string interpolation may be helpful:
+
+```
+a = "world"
+print(f"Hello {a}")
+```
+
+"""
+
+# ascent + conduit imports
+import conduit
+import conduit.blueprint
+import ascent
+
+import numpy as np
+
+# helper for creating tutorial data
+from ascent_tutorial_jupyter_utils import tutorial_tets_example
+
+# cleanup any old results
+!./cleanup.sh
+
+# Prepare tet mesh
+mesh = conduit.Node()
+tutorial_tets_example(mesh)
+
+# Create Ascent instance and publish tet mesh
+a = ascent.Ascent()
+a.open()
+a.publish(mesh)
+
+# Set up our actions
+actions = conduit.Node()
+add_act = actions.append()
+add_act["action"] = "add_scenes"
+
+# Declare a scene to render the dataset
+scenes = add_act["scenes"]
+
+# Set up our scene (s1)
+scenes["s1/plots/p1/type"] = "pseudocolor"
+scenes["s1/plots/p1/field"] = "var1"
+scenes["s1/plots/p1/color_table/name"] = "Viridis"
+
+# Add renders of the field at different angles
+# The view rotates 360 degrees in 10 degree increments,
+# starting at and returning to 0 degrees
+for i in range(37):
+    scenes[f"s1/renders/r{i}/image_name"] = f"out_scene_ex3_view{i}"
+    scenes[f"s1/renders/r{i}/camera/azimuth"] = 10.0*i
+
+# Without a loop, creating the first few renders would have looked
+# like this:
+    
+# scenes["s1/renders/r0/image_name"] = "out_scene_ex3_view0"
+# scenes["s1/renders/r0/camera/azimuth"] = 0.0
+
+# scenes["s1/renders/r1/image_name"] = "out_scene_ex3_view1"
+# scenes["s1/renders/r1/camera/azimuth"] = 10.0
+
+# scenes["s1/renders/r2/image_name"] = "out_scene_ex3_view2"
+# scenes["s1/renders/r2/camera/azimuth"] = 20.0
+
+# scenes["s1/renders/r3/image_name"] = "out_scene_ex3_view3"
+# scenes["s1/renders/r3/camera/azimuth"] = 30.0
+
+# scenes["s1/renders/r4/image_name"] = "out_scene_ex3_view4"
+# scenes["s1/renders/r4/camera/azimuth"] = 40.0
+
+# (...)
+
+a.execute(actions)
+
+ascent.jupyter.AscentViewer(a).show()
\ No newline at end of file
diff --git a/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise5.py b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise5.py
new file mode 100644
index 000000000..7941b6a5c
--- /dev/null
+++ b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise5.py
@@ -0,0 +1,111 @@
+"""
+# Exercise 5 prompts:
+
+Use and refactor the code in Pipeline Example 3.
+
+**First** break the second pipeline `pl2` with two filters into two pipelines (`pl2` and `pl3`) -- one with a single filter each. 
+
+**Second** create separate plots in `s1` for each of the three pipelines.
+
+You should end with a single scene and three plots that you can toggle between.
+
+"""
+
+# ascent + conduit imports
+import conduit
+import conduit.blueprint
+import ascent
+
+import numpy as np
+
+# cleanup any old results
+!./cleanup.sh
+
+# Create example mesh
+
+# create example mesh using the conduit blueprint braid helper
+mesh = conduit.Node()
+conduit.blueprint.mesh.examples.braid("hexs",
+                                      25,
+                                      25,
+                                      25,
+                                      mesh)
+
+a = ascent.Ascent()
+a.open()
+
+# publish mesh to ascent
+a.publish(mesh);
+
+# setup actions
+actions = conduit.Node()
+add_act = actions.append()
+add_act["action"] = "add_pipelines"
+pipelines = add_act["pipelines"]
+
+# create our first pipeline (pl1) 
+# with a contour filter (f1)
+pipelines["pl1/f1/type"] = "contour"
+# extract contours where braid variable
+# equals 0.2 and 0.4
+contour_params = pipelines["pl1/f1/params"]
+contour_params["field"] = "braid"
+iso_vals = np.array([0.2, 0.4],dtype=np.float32)
+contour_params["iso_values"].set(iso_vals)
+
+# create our second pipeline (pl2) with a threshold filter (f2)
+
+# add our threshold (pl2 f1)
+pipelines["pl2/f2/type"] = "threshold"
+thresh_params = pipelines["pl2/f2/params"]
+# set threshold parameters
+# keep elements with values between 0.0 and 0.5
+thresh_params["field"]  = "braid"
+thresh_params["min_value"] = 0.0
+thresh_params["max_value"] = 0.5
+
+
+# create our third pipeline (pl3) with a clip filter (f3)
+pipelines["pl3/f3/type"]   = "clip"
+clip_params = pipelines["pl3/f3/params"]
+# set clip parameters
+# use spherical clip
+clip_params["sphere/center/x"] = 0.0
+clip_params["sphere/center/y"] = 0.0
+clip_params["sphere/center/z"] = 0.0
+clip_params["sphere/radius"]   = 12
+
+# declare a scene to render our pipeline results
+add_act2 = actions.append()
+add_act2["action"] = "add_scenes"
+scenes = add_act2["scenes"]
+
+# add a scene (s1) with two pseudocolor plots 
+# (p1 and p2) that will render the results 
+# of our pipelines (pl1 and pl2)## Pipeline Example 2:
+
+# scene (s1) to render our first pipeline (pl1)
+scenes["s1/plots/p1/type"] = "pseudocolor"
+scenes["s1/plots/p1/pipeline"] = "pl1"
+scenes["s1/plots/p1/field"] = "braid"
+# scene (s2) to render our second pipeline (pl2)
+scenes["s2/plots/p1/type"] = "pseudocolor"
+scenes["s2/plots/p1/pipeline"] = "pl2"
+scenes["s2/plots/p1/field"] = "braid"
+# scene (s3) to render our third pipeline (pl3)
+scenes["s3/plots/p1/type"] = "pseudocolor"
+scenes["s3/plots/p1/pipeline"] = "pl3"
+scenes["s3/plots/p1/field"] = "braid"
+# set the output file names (ascent will add ".png")
+scenes["s1/image_name"] = "out_pipeline_ex3_1st_plot"
+scenes["s2/image_name"] = "out_pipeline_ex3_2nd_plot"
+scenes["s3/image_name"] = "out_pipeline_ex3_3rd_plot"
+
+# print our full actions tree
+print(actions.to_yaml())
+
+# execute
+a.execute(actions)
+
+# show the resulting image
+ascent.jupyter.AscentViewer(a).show()
\ No newline at end of file
diff --git a/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise6.py b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise6.py
new file mode 100644
index 000000000..88778ec77
--- /dev/null
+++ b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise6.py
@@ -0,0 +1,65 @@
+"""
+# Exercise 6 prompts:
+
+Use and modify the code from Relay Extract Example 2 above.
+
+**First**, add a second field -- "radial" -- to be saved alongside "braid".
+
+**Second** change the protocol from hdf5 to yaml and change the path of the file created from `out_export_braid_one_field` to `out_export_braid_two_fields`
+
+"""
+
+import conduit
+import conduit.blueprint
+import ascent
+
+import numpy as np
+
+!./cleanup.sh
+
+# create example mesh using the conduit blueprint braid helper
+mesh = conduit.Node()
+conduit.blueprint.mesh.examples.braid("hexs",
+                                      25,
+                                      25,
+                                      25,
+                                      mesh)
+
+# Use Ascent to export our mesh to blueprint flavored hdf5 files
+a = ascent.Ascent()
+a.open()
+
+# publish mesh to ascent
+a.publish(mesh);
+
+# setup actions
+actions = conduit.Node()
+add_act = actions.append()
+add_act["action"] = "add_extracts"
+
+# add a relay extract that will write mesh data to 
+# blueprint yaml file
+extracts = add_act["extracts"]
+extracts["e1/type"] = "relay"
+# Change the path of the file created
+extracts["e1/params/path"] = "out_export_braid_two_fields"
+# Update the protocol from hdf5 to yaml
+extracts["e1/params/protocol"] = "blueprint/mesh/yaml"
+
+#
+# Original: add fields parameter to limit the export to
+# just the `braid` field
+#
+extracts["e1/params/fields"].append().set("braid")
+# For exercise, add the "radial" field
+extracts["e1/params/fields"].append().set("radial")
+
+
+# print our full actions tree
+print(actions.to_yaml())
+
+# execute the actions
+a.execute(actions);
+
+# show details
+ascent.jupyter.AscentViewer(a).show()
\ No newline at end of file
diff --git a/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise7.py b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise7.py
new file mode 100644
index 000000000..cad7a3972
--- /dev/null
+++ b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise7.py
@@ -0,0 +1,131 @@
+"""
+# Exercise 7 prompts:
+
+Use and modify the code from Query Example 1:
+
+**First**, observe how changing the number of bins alters the entropy of the histogram in Query Example 1; change the number of bins from 128 to 64 and then to 32.
+
+**Second**, add two additional queries like `q2` -- `q3` with 64 bins and `q4` with 32 bins. 
+
+**Third**, plot entropy vs. cycles for each of the three entropy queries. Create arrays to store the entropy as calculated for `q[1-3]` and overlay these entropies on the same plot. 
+
+"""
+
+# ascent + conduit imports
+import conduit
+import conduit.blueprint
+import ascent
+
+import numpy as np
+import matplotlib.pyplot as plt
+
+# helpers we use to create tutorial data
+from ascent_tutorial_jupyter_utils import tutorial_gyre_example
+
+# cleanup any old results
+!./cleanup.sh
+
+# open ascent
+a = ascent.Ascent()
+a.open()
+
+# setup actions
+actions = conduit.Node()
+add_act = actions.append()
+add_act["action"] = "add_queries"
+
+# declare a queries to ask some questions
+queries = add_act["queries"] 
+
+# add a simple query expression (q1)
+queries["q1/params/expression"] = "cycle()"
+queries["q1/params/name"] = "cycle"
+
+# For the exercise, you can start by changing the input `num_bins=128` to `num_bins=64`
+# Then add queries q3 and q4 as below
+queries["q2/params/expression"] = "entropy(histogram(field('gyre'), num_bins=128))"
+queries["q2/params/name"] = "entropy_of_gyre"
+
+queries["q3/params/expression"] = "entropy(histogram(field('gyre'), num_bins=64))"
+queries["q3/params/name"] = "entropy_of_gyre_64bins"
+
+queries["q4/params/expression"] = "entropy(histogram(field('gyre'), num_bins=32))"
+queries["q4/params/name"] = "entropy_of_gyre_32bins"
+
+# declare a scene to render the dataset
+add_scenes = actions.append()
+add_scenes["action"] = "add_scenes"
+scenes = add_scenes["scenes"] 
+scenes["s1/plots/p1/type"] = "pseudocolor"
+scenes["s1/plots/p1/field"] = "gyre"
+# Set the output file name (ascent will add ".png")
+scenes["s1/image_name"] = "out_gyre"
+
+# view our full actions tree
+print(actions.to_yaml())
+
+# gyre time varying params
+nsteps = 10
+time = 0.0
+delta_time = 0.5
+
+info = conduit.Node()
+for step in range(nsteps):
+    # call helper that generates a double gyre time varying example mesh.
+    # gyre ref :https://shaddenlab.berkeley.edu/uploads/LCS-tutorial/examples.html
+    mesh = tutorial_gyre_example(time)
+    
+    # update the example cycle
+    cycle = 100 + step * 100
+
+    mesh["state/cycle"] = cycle
+    print("time: {} cycle: {}".format(time,cycle))
+    
+    # publish mesh to ascent
+    a.publish(mesh)
+    
+    # update image name
+    scenes["s1/image_name"] = "out_gyre_%04d" % step;
+    
+    # execute the actions
+    a.execute(actions)
+
+    # retrieve the info node that contains the query results
+    ts_info = conduit.Node()
+    a.info(ts_info)
+    
+    # add to our running info
+    info["expressions"].update(ts_info["expressions"])
+    
+    # update time
+    time = time + delta_time
+    
+# close ascent
+a.close()
+
+# create a 2D array with the entropy values from all 
+# cycles -- each row corresponds to the values from all
+# cycles for a fixed number of bins. Each column has
+# entropy values at a particular cycle for 128, 64, and 32 
+# bins in the histogram
+entropy = np.zeros([3, nsteps])
+
+# For the exercise, we can make gyre a tuple that stores entropy information for all 3 calculations
+gyre = info["expressions/entropy_of_gyre"], info["expressions/entropy_of_gyre_64bins"], info["expressions/entropy_of_gyre_32bins"]
+# Grab `child_names()` associated with the first element of gyre (this was the original data used in Query Example 1)
+cycle_names = gyre[0].child_names()
+
+# transfer conduit data to our summary numpy array
+for i in range(3):
+    for j in range(gyre[0].number_of_children()):
+        entropy[i][j] = gyre[i][j]["value"]
+
+print("Entropy Result")
+print(entropy)
+
+# plot the data for each of the 3 entropy arrays
+for i in range(3):
+    plt.plot(cycle_names, entropy[i])
+plt.ylabel('entropy')
+plt.xlabel('cycle')
+plt.show()
\ No newline at end of file
diff --git a/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise8.py b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise8.py
new file mode 100644
index 000000000..86111180b
--- /dev/null
+++ b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise8.py
@@ -0,0 +1,95 @@
+"""
+# Exercise 8 prompts:
+
+Create your own trigger that sets up a scene with two renders (as in notebook 4) at cycle 1000.
+
+**First**, refactor the code from Trigger Example 1 to have a single trigger at cycle 1000.
+
+**Second**, create a new actions file or prepare to edit `cycle_trigger_actions.yaml`. Make sure your trigger is using the correct actions file.
+
+**Third**, edit your actions .yaml file to include two renders, as in notebook 4's "Scene Example 3". One render can use an azimuth angle of 10 degrees and the other a 3x zoom.
+
+**Fourth**, use `ascent.jupyter.AscentImageSequenceViewer` as above to plot the two .png files created by your trigger.
+
+"""
+
+# cleanup any old results
+!./cleanup.sh
+
+# ascent + conduit imports
+import conduit
+import conduit.blueprint
+import ascent
+
+import numpy as np
+
+# helpers we use to create tutorial data
+from ascent_tutorial_jupyter_utils import img_display_width
+from ascent_tutorial_jupyter_utils import tutorial_gyre_example
+
+import matplotlib.pyplot as plt
+
+# Use triggers to render when conditions occur
+a = ascent.Ascent()
+a.open()
+
+# setup actions
+actions = conduit.Node()
+
+# declare a question to ask 
+add_queries = actions.append()
+add_queries["action"] = "add_queries"
+
+# add our entropy query (q1)
+queries = add_queries["queries"] 
+queries["q1/params/expression"] = "entropy(histogram(field('gyre'), num_bins=128))"
+queries["q1/params/name"] = "entropy"
+
+# declare triggers 
+add_triggers = actions.append()
+add_triggers["action"] = "add_triggers"
+triggers = add_triggers["triggers"] 
+
+# For the exercise, update `t1` to fire at cycle 1000.
+# Create a new actions file or edit cycle_trigger_actions.yaml
+# to specify two renders as in `solutions_notebook8.yaml`
+triggers["myt1/params/condition"] = "cycle() == 1000"
+triggers["myt1/params/actions_file"] = "solution_notebook8.yaml"
+
+# view our full actions tree
+print(actions.to_yaml())
+
+# gyre time varying params
+nsteps = 10
+time = 0.0
+delta_time = 0.5
+
+for step in range(nsteps):
+    # call helper that generates a double gyre time varying example mesh.
+    # gyre ref :https://shaddenlab.berkeley.edu/uploads/LCS-tutorial/examples.html
+    mesh = tutorial_gyre_example(time)
+    
+    # update the example cycle
+    cycle = 100 + step * 100
+    mesh["state/cycle"] = cycle
+    print("time: {} cycle: {}".format(time,cycle))
+    
+    # publish mesh to ascent
+    a.publish(mesh)
+    
+    # execute the actions
+    a.execute(actions)
+    
+    # update time
+    time = time + delta_time
+
+# retrieve the info node that contains the trigger and query results
+info = conduit.Node()
+a.info(info)
+
+# close ascent
+a.close()
+
+# show the result image from the cycle trigger -- 
+# include whatever filenames you declared for your renders in your yaml file
+ascent.jupyter.AscentImageSequenceViewer(["cycle_trigger_out_r1.png", "cycle_trigger_out_r2.png"]).show()
\ No newline at end of file
diff --git a/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise9.py b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise9.py
new file mode 100644
index 000000000..c1ed1a054
--- /dev/null
+++ b/src/examples/tutorial/ascent_intro/notebooks/solutions/exercise9.py
@@ -0,0 +1,141 @@
+"""
+# Exercise 9 prompts:
+
+**First**, swap out “radial” for “braid” in each of the queries for Binning Example 1 such as
+
+```
+queries["q1/params/expression"] = "binning('radial','max', [axis('x',num_bins=20)])";
+```
+
+Run the resulting code to see how this modifies the final plots.
+
+**Second**, copy and modify the existing code for 1D binning projected along the x axis. Your modified code should 
+create a fourth query that 1D bins along the y axis and plot the result. 
+
+**Note** that queries `q2` and `q3` are omitted from the solution for simplicity as they do not change.
+"""
+
+# ascent + conduit imports
+import conduit
+import conduit.blueprint
+import ascent
+
+import numpy as np
+
+# cleanup any old results
+!./cleanup.sh
+
+# create example mesh using the conduit blueprint braid helper
+mesh = conduit.Node()
+conduit.blueprint.mesh.examples.braid("hexs",
+                                      25,
+                                      25,
+                                      25,
+                                      mesh)
+
+## Data Binning Example
+
+# Use Ascent to bin an input mesh in a few ways
+a = ascent.Ascent()
+
+# open ascent
+a.open()
+
+# publish mesh to ascent
+a.publish(mesh)
+
+# setup actions
+actions = conduit.Node()
+add_act = actions.append()
+add_act["action"] = "add_queries"
+
+# declare a queries to ask some questions
+queries = add_act["queries"] 
+
+# Create a 1D binning projected onto the x-axis
+queries["q1/params/expression"] = "binning('braid','max', [axis('x',num_bins=20)])";
+queries["q1/params/name"] = "1d_binning"
+
+# Create a 2D binning projected onto the x-y plane
+queries["q2/params/expression"] = "binning('braid','max', [axis('x',num_bins=20), axis('y',num_bins=20)])";
+queries["q2/params/name"] = "2d_binning"
+
+# Create a binning that emulates a line-out, that is, bin all values
+# between x = [-1,1], y = [-1,1] along the z-axis in 20 bins.
+# The result is a 1x1x20 array
+queries["q3/params/expression"] = "binning('braid','max', [axis('x',[-1,1]), axis('y', [-1,1]), axis('z', num_bins=20)])";
+queries["q3/params/name"] = "3d_binning"
+
+# Create a 1D binning projected onto the y-axis
+queries["q4/params/expression"] = "binning('braid','max', [axis('y',num_bins=20)])";
+queries["q4/params/name"] = "1d_binning_y"
+
+# print our full actions tree
+print(actions.to_yaml())
+
+# execute the actions
+a.execute(actions)
+
+## Plot results
+
+# extra imports for plotting
+import yaml
+import matplotlib.pyplot as plt
+
+# grab info from last execution which includes our binning results
+info = conduit.Node()
+a.info(info)
+
+## Plot the 1d binning result projected along x axis
+
+binning = info.fetch_existing('expressions/1d_binning')
+cycles = binning.child_names()
+bins = []
+
+# loop through each cycle and grab the bins
+for cycle in cycles:
+  bins.append(binning[cycle + '/attrs/value/value'])
+
+# create the coordinate axis using bin centers
+x_axis = binning[cycles[0]]['attrs/bin_axes/value/x']
+x_min = x_axis['min_val']
+x_max = x_axis['max_val']
+x_bins = x_axis['num_bins']
+
+x_delta = (x_max - x_min) / float(x_bins)
+x_start = x_min + 0.5 * x_delta
+x_vals = []
+for b in range(0,x_bins):
+  x_vals.append(b * x_delta + x_start)
+
+# plot the curve from the last cycle
+plt.plot(x_vals, bins[-1])
+plt.xlabel('x position')
+plt.ylabel('max braid')
+
+## Plot the 1d binning result projected along y axis
+
+binning = info.fetch_existing('expressions/1d_binning_y')
+cycles = binning.child_names()
+bins = []
+
+# loop through each cycle and grab the bins
+for cycle in cycles:
+  bins.append(binning[cycle + '/attrs/value/value'])
+
+# create the coordinate axis using bin centers
+y_axis = binning[cycles[0]]['attrs/bin_axes/value/y']
+y_min = y_axis['min_val']
+y_max = y_axis['max_val']
+y_bins = y_axis['num_bins']
+
+y_delta = (y_max - y_min) / float(y_bins)
+y_start = y_min + 0.5 * y_delta
+y_vals = []
+for b in range(0,x_bins):
+  y_vals.append(b * y_delta + y_start)
+
+# plot the curve from the last cycle
+plt.plot(y_vals, bins[-1])
+plt.xlabel('y position')
+plt.ylabel('max braid')
\ No newline at end of file
diff --git a/src/libs/ascent/CMakeLists.txt b/src/libs/ascent/CMakeLists.txt
index 6f969091e..e1e1fa0fd 100644
--- a/src/libs/ascent/CMakeLists.txt
+++ b/src/libs/ascent/CMakeLists.txt
@@ -126,23 +126,23 @@ set(ascent_headers
     runtimes/ascent_transmogrifier.hpp
     # expressions
     runtimes/ascent_expression_eval.hpp
-    runtimes/expressions/ascent_blueprint_architect.hpp
-    runtimes/expressions/ascent_blueprint_topologies.hpp
-    runtimes/expressions/ascent_conduit_reductions.hpp
     runtimes/expressions/ascent_expression_filters.hpp
     runtimes/expressions/ascent_expressions_ast.hpp
     runtimes/expressions/ascent_expressions_tokens.hpp
     runtimes/expressions/ascent_expressions_parser.hpp
     runtimes/expressions/ascent_math.hpp
-    runtimes/expressions/ascent_dispatch.hpp
-    runtimes/expressions/ascent_meshes.hpp
+    runtimes/expressions/ascent_blueprint_architect.hpp
+    runtimes/expressions/ascent_blueprint_topologies.hpp
+    runtimes/expressions/ascent_blueprint_device_reductions.hpp
+    runtimes/expressions/ascent_blueprint_device_dispatch.hpp
+    runtimes/expressions/ascent_blueprint_device_mesh_objects.hpp
+    runtimes/expressions/ascent_blueprint_type_utils.hpp
     runtimes/expressions/ascent_array.hpp
     runtimes/expressions/ascent_array_utils.hpp
     runtimes/expressions/ascent_array_internals.hpp
     runtimes/expressions/ascent_array_internals_base.hpp
     runtimes/expressions/ascent_array_registry.hpp
     runtimes/expressions/ascent_data_binning.hpp
-    runtimes/expressions/ascent_memory_interface.hpp
     runtimes/expressions/ascent_memory_manager.hpp
     runtimes/expressions/ascent_execution_policies.hpp
     runtimes/expressions/ascent_execution_manager.hpp
@@ -163,6 +163,7 @@ set(ascent_headers
     runtimes/flow_filters/ascent_runtime_htg_filters.hpp
     runtimes/flow_filters/ascent_runtime_trigger_filters.hpp
     runtimes/flow_filters/ascent_runtime_query_filters.hpp
+    runtimes/flow_filters/ascent_runtime_command_filters.hpp
     runtimes/flow_filters/ascent_runtime_vtkh_utils.hpp
     runtimes/flow_filters/ascent_runtime_utils.hpp
     # utils
@@ -196,7 +197,8 @@ set(ascent_sources
     runtimes/ascent_expression_eval.cpp
     runtimes/expressions/ascent_blueprint_architect.cpp
     runtimes/expressions/ascent_blueprint_topologies.cpp
-    runtimes/expressions/ascent_conduit_reductions.cpp
+    runtimes/expressions/ascent_blueprint_device_reductions.cpp
+    runtimes/expressions/ascent_blueprint_type_utils.cpp
     runtimes/expressions/ascent_expression_filters.cpp
     runtimes/expressions/ascent_expressions_ast.cpp
     runtimes/expressions/ascent_expressions_tokens.cpp
@@ -227,6 +229,7 @@ set(ascent_sources
     runtimes/flow_filters/ascent_runtime_htg_filters.cpp
     runtimes/flow_filters/ascent_runtime_trigger_filters.cpp
     runtimes/flow_filters/ascent_runtime_query_filters.cpp
+    runtimes/flow_filters/ascent_runtime_command_filters.cpp
     runtimes/flow_filters/ascent_runtime_utils.cpp
     # utils
     utils/ascent_actions_utils.cpp
@@ -243,7 +246,7 @@ set(ascent_sources
 
 # explicit list of any sources that need to be device linked
 set(ascent_device_sources runtimes/expressions/ascent_memory_manager.cpp
-                          runtimes/expressions/ascent_conduit_reductions.cpp
+                          runtimes/expressions/ascent_blueprint_device_reductions.cpp
                           runtimes/expressions/ascent_array.cpp
                           runtimes/expressions/ascent_array_utils.cpp
                           runtimes/expressions/ascent_array_internals.cpp
@@ -267,6 +270,7 @@ if(VTKM_FOUND)
         runtimes/flow_filters/ascent_runtime_rendering_filters.hpp
         runtimes/flow_filters/ascent_runtime_rover_filters.hpp
         runtimes/flow_filters/ascent_runtime_conduit_to_vtkm_parsing.hpp
+        runtimes/flow_filters/ascent_runtime_filters.hpp
         runtimes/ascent_main_runtime.hpp)
 
     set(ascent_vtkh_dep_sources
@@ -278,6 +282,7 @@ if(VTKM_FOUND)
         runtimes/flow_filters/ascent_runtime_rendering_filters.cpp
         runtimes/flow_filters/ascent_runtime_rover_filters.cpp
         runtimes/flow_filters/ascent_runtime_conduit_to_vtkm_parsing.cpp
+        runtimes/flow_filters/ascent_runtime_filters.cpp
         runtimes/ascent_main_runtime.cpp)
 
     list(APPEND ascent_headers ${ascent_vtkh_dep_headers})
diff --git a/src/libs/ascent/ascent.cpp b/src/libs/ascent/ascent.cpp
index e102b3b1c..cc87b465e 100644
--- a/src/libs/ascent/ascent.cpp
+++ b/src/libs/ascent/ascent.cpp
@@ -487,6 +487,55 @@ Ascent::info(conduit::Node &info_out)
     }
 }
 
+
+//-----------------------------------------------------------------------------
+conduit::Node &
+Ascent::info()
+{
+    try
+    {
+        if(m_runtime == NULL)
+        {
+            
+        }
+        else // we don't have info throw and error
+        {
+            conduit::Node &info = m_runtime->Info();
+            info["status"].set(m_status);
+            return info;
+        }
+    }
+    catch(conduit::Error &e)
+    {
+        set_status("Ascent::info failed",
+                   e.message());
+
+        if(m_forward_exceptions)
+        {
+            throw e;
+        }
+        else
+        {
+          if(m_runtime != NULL)
+          {
+            std::stringstream msg;
+            msg << "[Error] Ascent::info"
+                << e.message() << std::endl;
+            m_runtime->DisplayError(msg.str());
+          }
+          else
+          {
+            std::cerr<< "[Error] Ascent::info"
+                     << e.message() << std::endl;
+          }
+        }
+    }
+
+    m_info.reset();
+    m_info["status"] = m_status;
+    return m_info;
+}
+
 //-----------------------------------------------------------------------------
 void
 Ascent::close()
@@ -809,6 +858,83 @@ about(conduit::Node &n)
 
 }
 
+// Callback maps
+static std::map m_void_callback_map;
+static std::map m_bool_callback_map;
+
+//-----------------------------------------------------------------------------
+void
+register_callback(const std::string &callback_name,
+                  void (*callback_function)(conduit::Node &, conduit::Node &))
+{
+    if (callback_name == "")
+    {
+        ASCENT_ERROR("cannot register an anonymous void callback");
+    }
+    else if (m_void_callback_map.count(callback_name) != 0)
+    {
+        ASCENT_ERROR("cannot register more than one void callback under the name '" << callback_name << "'");
+    }
+    else if (m_bool_callback_map.count(callback_name) != 0)
+    {
+        ASCENT_ERROR("cannot register both a void and bool callback under the same name '" << callback_name << "'");
+    }
+    m_void_callback_map.insert(std::make_pair(callback_name, callback_function));
+}
+
+//-----------------------------------------------------------------------------
+void
+register_callback(const std::string &callback_name,
+                  bool (*callback_function)(void))
+{
+    if (callback_name == "")
+    {
+        ASCENT_ERROR("cannot register an anonymous bool callback");
+    }
+    else if (m_bool_callback_map.count(callback_name) != 0)
+    {
+        ASCENT_ERROR("cannot register more than one bool callback under the name '" << callback_name << "'");
+    }
+    else if (m_void_callback_map.count(callback_name) != 0)
+    {
+        ASCENT_ERROR("cannot register both a void and bool callback under the same name '" << callback_name << "'");
+    }
+    m_bool_callback_map.insert(std::make_pair(callback_name, callback_function));
+}
+
+//-----------------------------------------------------------------------------
+void
+execute_callback(std::string callback_name,
+                 conduit::Node ¶ms,
+                 conduit::Node &output)
+{
+    if (m_void_callback_map.count(callback_name) != 1)
+    {
+        ASCENT_ERROR("requested void callback '" << callback_name << "' was never registered");
+    }
+    auto callback_function = m_void_callback_map.at(callback_name);
+    return callback_function(params, output);
+}
+
+//-----------------------------------------------------------------------------
+bool
+execute_callback(std::string callback_name)
+{
+    if (m_bool_callback_map.count(callback_name) != 1)
+    {
+        ASCENT_ERROR("requested bool callback '" << callback_name << "' was never registered");
+    }
+    auto callback_function = m_bool_callback_map.at(callback_name);
+    return callback_function();
+}
+
+//-----------------------------------------------------------------------------
+void
+reset_callbacks()
+{
+    m_void_callback_map.clear();
+    m_bool_callback_map.clear();
+}
 
 //-----------------------------------------------------------------------------
 // -- end ascent:: --
diff --git a/src/libs/ascent/ascent.hpp b/src/libs/ascent/ascent.hpp
index f95dbee38..8c495be78 100644
--- a/src/libs/ascent/ascent.hpp
+++ b/src/libs/ascent/ascent.hpp
@@ -44,12 +44,13 @@ class ASCENT_API Ascent
            Ascent();
           ~Ascent();
 
-    void   open(); // open with default options
-    void   open(const conduit::Node &options);
-    void   publish(const conduit::Node &data);
-    void   execute(const conduit::Node &actions);
-    void   info(conduit::Node &info_out);
-    void   close();
+    void             open(); // open with default options
+    void             open(const conduit::Node &options);
+    void             publish(const conduit::Node &data);
+    void             execute(const conduit::Node &actions);
+    void             info(conduit::Node &info_out);
+    conduit::Node   &info();
+    void             close();
 
 private:
     
@@ -62,15 +63,33 @@ class ASCENT_API Ascent
     std::string    m_actions_file;
     conduit::Node  m_options;
     conduit::Node  m_status;
+    conduit::Node  m_info;
 };
 
-
 //-----------------------------------------------------------------------------
 std::string ASCENT_API about();
 
 //-----------------------------------------------------------------------------
 void        ASCENT_API about(conduit::Node &node);
 
+//-----------------------------------------------------------------------------
+void        ASCENT_API register_callback(const std::string &callback_name,
+                                         void (*callback_function)(conduit::Node &, conduit::Node &));
+//-----------------------------------------------------------------------------
+void        ASCENT_API register_callback(const std::string &callback_name,
+                                         bool (*callback_function)(void));
+
+//-----------------------------------------------------------------------------
+void        ASCENT_API execute_callback(std::string callback_name,
+                                        conduit::Node ¶ms,
+                                        conduit::Node &output);
+
+//-----------------------------------------------------------------------------
+bool        ASCENT_API execute_callback(std::string callback_name);
+
+//-----------------------------------------------------------------------------
+void        ASCENT_API reset_callbacks();
+
 };
 //-----------------------------------------------------------------------------
 // -- end ascent:: --
diff --git a/src/libs/ascent/ascent_runtime.hpp b/src/libs/ascent/ascent_runtime.hpp
index 3b7ee5cb2..615be380a 100644
--- a/src/libs/ascent/ascent_runtime.hpp
+++ b/src/libs/ascent/ascent_runtime.hpp
@@ -30,16 +30,18 @@ class ASCENT_API Runtime
     Runtime();
     virtual ~Runtime();
 
-    virtual void  Initialize(const conduit::Node &options)=0;
+    virtual void           Initialize(const conduit::Node &options)=0;
 
-    virtual void  Publish(const conduit::Node &data)=0;
-    virtual void  Execute(const conduit::Node &actions)=0;
+    virtual void           Publish(const conduit::Node &data)=0;
+    virtual void           Execute(const conduit::Node &actions)=0;
 
-    virtual void  Info(conduit::Node &info_out)=0;
+    virtual void           Info(conduit::Node &info_out)=0;
 
-    virtual void  Cleanup()=0;
+    virtual conduit::Node &Info()=0;
 
-    virtual void  DisplayError(const std::string &msg);
+    virtual void           Cleanup()=0;
+
+    virtual void           DisplayError(const std::string &msg);
 };
 
 //-----------------------------------------------------------------------------
diff --git a/src/libs/ascent/c/ascent.h b/src/libs/ascent/c/ascent.h
index 073acebcd..2d12b22e9 100644
--- a/src/libs/ascent/c/ascent.h
+++ b/src/libs/ascent/c/ascent.h
@@ -53,6 +53,8 @@ void ASCENT_API ascent_execute(Ascent *c_ascent, conduit_node *actions);
 
 void ASCENT_API ascent_info(Ascent *c_ascent, conduit_node *result);
 
+conduit_node ASCENT_API *ascent_info_ref(Ascent *c_ascent);
+
 void ASCENT_API ascent_close(Ascent *c_ascent);
 
 void ASCENT_API ascent_timer_start(char *name);
diff --git a/src/libs/ascent/c/ascent_c.cpp b/src/libs/ascent/c/ascent_c.cpp
index 9ab961517..45d6f4ae1 100644
--- a/src/libs/ascent/c/ascent_c.cpp
+++ b/src/libs/ascent/c/ascent_c.cpp
@@ -96,6 +96,14 @@ ascent_info(Ascent *c_ascent,
     v->info(n);
 }
 
+//---------------------------------------------------------------------------//
+conduit_node *
+ascent_info_ref(Ascent *c_ascent)
+{
+    ascent::Ascent *v = cpp_ascent(c_ascent);
+    return conduit::c_node(&v->info());
+}
+
 //---------------------------------------------------------------------------//
 void
 ascent_close(Ascent *c_ascent)
diff --git a/src/libs/ascent/fortran/ascent_fortran.f90 b/src/libs/ascent/fortran/ascent_fortran.f90
index e3b144e04..1348a58c1 100644
--- a/src/libs/ascent/fortran/ascent_fortran.f90
+++ b/src/libs/ascent/fortran/ascent_fortran.f90
@@ -80,6 +80,15 @@ subroutine ascent_info(cascent, cnode) &
         type(C_PTR), value, intent(IN) ::cnode
     end subroutine ascent_info
 
+    !--------------------------------------------------------------------------
+    function ascent_info_ref(cascent) result(cnode) &
+            bind(C, name="ascent_info_ref")
+        use iso_c_binding
+        implicit none
+        type(C_PTR), value, intent(IN) ::cascent
+        type(C_PTR) :: cnode
+    end function ascent_info_ref
+
     !--------------------------------------------------------------------------
     subroutine ascent_close(cascent) &
             bind(C, name="ascent_close")
diff --git a/src/libs/ascent/python/ascent_module/ascent_mpi_python.cpp b/src/libs/ascent/python/ascent_module/ascent_mpi_python.cpp
index 1a203a6a6..a9f49cff4 100644
--- a/src/libs/ascent/python/ascent_module/ascent_mpi_python.cpp
+++ b/src/libs/ascent/python/ascent_module/ascent_mpi_python.cpp
@@ -151,6 +151,29 @@ struct PyAscent_MPI_Ascent
     Ascent *ascent; // NoteIterator is light weight, we can deal with copies
 };
 
+//---------------------------------------------------------------------------//
+// Helper that promotes ascent error to python error
+//---------------------------------------------------------------------------//
+static void
+PyAscent_MPI_Ascent_Error_To_PyErr(const conduit::Error &e)
+{
+    std::ostringstream oss;
+    oss << "Ascent Error: " << e.message();
+    PyErr_SetString(PyExc_RuntimeError,
+                    oss.str().c_str());
+}
+
+//---------------------------------------------------------------------------//
+// Helper that promotes ascent error to python error
+//---------------------------------------------------------------------------//
+static void
+PyAscent_MPI_Cpp_Error_To_PyErr(const char *msg)
+{
+    std::ostringstream oss;
+    oss << "Ascent Error: " << msg;
+    PyErr_SetString(PyExc_RuntimeError,
+                    oss.str().c_str());
+}
 
 //---------------------------------------------------------------------------//
 static PyObject *
@@ -465,6 +488,72 @@ PyAscent_MPI_about()
     return (PyObject*)py_node_res;
 }
 
+//---------------------------------------------------------------------------//
+// ascent::execute_callback
+//---------------------------------------------------------------------------//
+static PyObject *
+PyAscent_MPI_execute_callback(PyObject *self,
+                              PyObject *args)
+{
+    char *callback_name;
+    PyObject *py_params = NULL;
+    PyObject *py_output = NULL;
+
+    if (!PyArg_ParseTuple(args,
+                          "sOO",
+                          &callback_name,
+                          &py_params,
+                          &py_output))
+    {
+        return NULL;
+    }
+
+    try
+    {
+        if(py_params != NULL && py_output != NULL)
+        {
+            if(!PyConduit_Node_Check(py_params))
+            {
+                PyErr_SetString(PyExc_TypeError,
+                                "Ascent::execute_callback 'params' argument must be a "
+                                "conduit::Node");
+                return NULL;
+            }
+            else if (!PyConduit_Node_Check(py_output))
+            {
+                PyErr_SetString(PyExc_TypeError,
+                                "Ascent::execute_callback 'output' argument must be a "
+                                "conduit::Node");
+                return NULL;
+            }
+            std::string callback_name_string = callback_name;
+            Node *params = PyConduit_Node_Get_Node_Ptr(py_params);
+            Node *output = PyConduit_Node_Get_Node_Ptr(py_output);
+            ascent::execute_callback(callback_name, *params, *output);
+            Py_RETURN_NONE;
+        }
+    }
+    catch(conduit::Error e)
+    {
+        PyAscent_MPI_Ascent_Error_To_PyErr(e);
+        return NULL;
+    }
+    // also try to bottle other errors, to prevent python
+    // from crashing due to uncaught exception
+    catch(std::exception &e)
+    {
+        PyAscent_MPI_Cpp_Error_To_PyErr(e.what());
+        return NULL;
+    }
+    catch(...)
+    {
+        PyAscent_MPI_Cpp_Error_To_PyErr("unknown cpp exception thrown");
+        return NULL;
+    }
+
+    Py_RETURN_NONE;
+}
+
 //---------------------------------------------------------------------------//
 // Python Module Method Defs
 //---------------------------------------------------------------------------//
@@ -476,6 +565,11 @@ static PyMethodDef ascent_mpi_python_funcs[] =
       METH_NOARGS,
       NULL},
     //-----------------------------------------------------------------------//
+    {"execute_callback",
+     (PyCFunction)PyAscent_MPI_execute_callback,
+      METH_VARARGS,
+      NULL},
+    //-----------------------------------------------------------------------//
     // end ascent methods table
     //-----------------------------------------------------------------------//
     {NULL, NULL, METH_VARARGS, NULL}
diff --git a/src/libs/ascent/python/ascent_module/ascent_python.cpp b/src/libs/ascent/python/ascent_module/ascent_python.cpp
index 8e94801c4..6813bd469 100644
--- a/src/libs/ascent/python/ascent_module/ascent_python.cpp
+++ b/src/libs/ascent/python/ascent_module/ascent_python.cpp
@@ -410,27 +410,32 @@ PyAscent_Ascent_info(PyAscent_Ascent *self,
 
     if (!PyArg_ParseTupleAndKeywords(args,
                                      kwargs,
-                                     "O",
+                                     "|O",
                                      const_cast(kwlist),
                                      &py_node))
     {
         return NULL;
     }
 
-
-    if(!PyConduit_Node_Check(py_node))
-    {
-        PyErr_SetString(PyExc_TypeError,
-                        "Ascent::Info 'out' argument must be a "
-                        "conduit::Node");
-        return NULL;
-    }
-
-    Node *node = PyConduit_Node_Get_Node_Ptr(py_node);
-
     try
     {
+        if(py_node != NULL) // copy out case 
+        {
+            if(!PyConduit_Node_Check(py_node))
+            {
+                PyErr_SetString(PyExc_TypeError,
+                                "Ascent::Info 'out' argument must be a "
+                                "conduit::Node");
+                return NULL;
+            }
+            
+            Node *node = PyConduit_Node_Get_Node_Ptr(py_node);
             self->ascent->info(*node);
+        }
+        else // return wrapped internal info ref case
+        {
+            return PyConduit_Node_Python_Wrap(&self->ascent->info(),0);
+        }
     }
     catch(conduit::Error e)
     {
@@ -450,7 +455,6 @@ PyAscent_Ascent_info(PyAscent_Ascent *self,
         return NULL;
     }
 
-
     Py_RETURN_NONE;
 }
 
@@ -506,7 +510,7 @@ static PyMethodDef PyAscent_Ascent_METHODS[] = {
      METH_VARARGS | METH_KEYWORDS,
      "{todo}"},
     //-----------------------------------------------------------------------//
-     {"execute",
+    {"execute",
      (PyCFunction)PyAscent_Ascent_execute,
      METH_VARARGS | METH_KEYWORDS,
      "{todo}"},
@@ -592,6 +596,72 @@ PyAscent_about()
     return (PyObject*)py_node_res;
 }
 
+//---------------------------------------------------------------------------//
+// ascent::execute_callback
+//---------------------------------------------------------------------------//
+static PyObject *
+PyAscent_execute_callback(PyObject *self,
+                          PyObject *args)
+{
+    char *callback_name;
+    PyObject *py_params = NULL;
+    PyObject *py_output = NULL;
+
+    if (!PyArg_ParseTuple(args,
+                          "sOO",
+                          &callback_name,
+                          &py_params,
+                          &py_output))
+    {
+        return NULL;
+    }
+
+    try
+    {
+        if(py_params != NULL && py_output != NULL)
+        {
+            if(!PyConduit_Node_Check(py_params))
+            {
+                PyErr_SetString(PyExc_TypeError,
+                                "Ascent::execute_callback 'params' argument must be a "
+                                "conduit::Node");
+                return NULL;
+            }
+            else if (!PyConduit_Node_Check(py_output))
+            {
+                PyErr_SetString(PyExc_TypeError,
+                                "Ascent::execute_callback 'output' argument must be a "
+                                "conduit::Node");
+                return NULL;
+            }
+            std::string callback_name_string = callback_name;
+            Node *params = PyConduit_Node_Get_Node_Ptr(py_params);
+            Node *output = PyConduit_Node_Get_Node_Ptr(py_output);
+            ascent::execute_callback(callback_name, *params, *output);
+            Py_RETURN_NONE;
+        }
+    }
+    catch(conduit::Error e)
+    {
+        PyAscent_Ascent_Error_To_PyErr(e);
+        return NULL;
+    }
+    // also try to bottle other errors, to prevent python
+    // from crashing due to uncaught exception
+    catch(std::exception &e)
+    {
+        PyAscent_Cpp_Error_To_PyErr(e.what());
+        return NULL;
+    }
+    catch(...)
+    {
+        PyAscent_Cpp_Error_To_PyErr("unknown cpp exception thrown");
+        return NULL;
+    }
+
+    Py_RETURN_NONE;
+}
+
 //---------------------------------------------------------------------------//
 // Python Module Method Defs
 //---------------------------------------------------------------------------//
@@ -603,6 +673,11 @@ static PyMethodDef ascent_python_funcs[] =
       METH_NOARGS,
       NULL},
     //-----------------------------------------------------------------------//
+    {"execute_callback",
+     (PyCFunction)PyAscent_execute_callback,
+      METH_VARARGS,
+      NULL},
+    //-----------------------------------------------------------------------//
     // end ascent methods table
     //-----------------------------------------------------------------------//
     {NULL, NULL, METH_VARARGS, NULL}
diff --git a/src/libs/ascent/python/ascent_module/py_src/ascent.py b/src/libs/ascent/python/ascent_module/py_src/ascent.py
index 57ff0dfb0..38b471f15 100644
--- a/src/libs/ascent/python/ascent_module/py_src/ascent.py
+++ b/src/libs/ascent/python/ascent_module/py_src/ascent.py
@@ -24,6 +24,14 @@ def about():
         raise ImportError('failed to import ascent_python, was Ascent built with serial support ENABLE_SERIAL=ON ?')
     return None
 
+def execute_callback(callback_name, params, output):
+    try:
+        from .ascent_python import execute_callback as ascent_execute_callback
+        return ascent_execute_callback(callback_name, params, output)
+    except ImportError:
+        raise ImportError('failed to import ascent_python, was Ascent built with serial support ENABLE_SERIAL=ON ?')
+    return None
+
 def Ascent():
     try:
         from .ascent_python import Ascent as ascent_obj
diff --git a/src/libs/ascent/python/ascent_module/py_src/jupyter.py b/src/libs/ascent/python/ascent_module/py_src/jupyter.py
index b5a14152d..e9f9da1e5 100644
--- a/src/libs/ascent/python/ascent_module/py_src/jupyter.py
+++ b/src/libs/ascent/python/ascent_module/py_src/jupyter.py
@@ -196,14 +196,14 @@ def __init__(self, info):
             tab = ipywidgets.Tab()
             tab.children = widgets
             for i,v in enumerate(widget_titles):
-                tab.set_title(i,v)
+                tab.set_title(i,"[ " + v + " ] ")
             self.main = ipywidgets.VBox([tab,
                                          status.show()],
-                                         layout=ipywidgets.Layout(overflow_x="hidden"))
+                                         layout=ipywidgets.Layout(overflow="hidden"))
         else:
             # only the status button
             self.main = ipywidgets.VBox([status.show()],
-                                        layout=ipywidgets.Layout(overflow_x="hidden"))
+                                        layout=ipywidgets.Layout(overflow="hidden"))
 
     def show(self):
         return self.main
diff --git a/src/libs/ascent/python/ascent_module/py_src/mpi/ascent_mpi.py b/src/libs/ascent/python/ascent_module/py_src/mpi/ascent_mpi.py
index 787ad1e79..137c1e47a 100644
--- a/src/libs/ascent/python/ascent_module/py_src/mpi/ascent_mpi.py
+++ b/src/libs/ascent/python/ascent_module/py_src/mpi/ascent_mpi.py
@@ -21,16 +21,23 @@ def about():
         from .ascent_mpi_python import about as ascent_about
         return ascent_about()
     except ImportError:
-        raise ImportError('failed to import ascent_mpi_python, was Ascent built with mpi support?')
+        raise ImportError('failed to import ascent_mpi_python, was Ascent built with MPI support ENABLE_MPI=ON ?')
     return None
 
+def execute_callback(callback_name, params, output):
+    try:
+        from .ascent_mpi_python import execute_callback as ascent_execute_callback
+        return ascent_execute_callback(callback_name, params, output)
+    except ImportError:
+        raise ImportError('failed to import ascent_mpi_python, was Ascent built with MPI support ENABLE_MPI=ON ?')
+    return None
 
 def Ascent():
     try:
         from .ascent_mpi_python import Ascent as ascent_obj
         return ascent_obj()
     except ImportError:
-        raise ImportError('failed to import ascent_mpi_python, was Ascent built with mpi support?')
+        raise ImportError('failed to import ascent_mpi_python, was Ascent built with MPI support ENABLE_MPI=ON ?')
     return None
 
 def jupyter_bridge():
@@ -38,7 +45,7 @@ def jupyter_bridge():
         from ..bridge_kernel.server import jupyter_extract
         return jupyter_extract()
     except ImportError:
-        raise ImportError('failed to import ascent_mpi_python, was Ascent built with mpi support?')
+        raise ImportError('failed to import ascent_mpi_python, was Ascent built with MPI support ENABLE_MPI=ON ?')
     return None
 
 
diff --git a/src/libs/ascent/runtimes/ascent_empty_runtime.cpp b/src/libs/ascent/runtimes/ascent_empty_runtime.cpp
index 75bd618a4..47dd9d9e3 100644
--- a/src/libs/ascent/runtimes/ascent_empty_runtime.cpp
+++ b/src/libs/ascent/runtimes/ascent_empty_runtime.cpp
@@ -82,16 +82,22 @@ EmptyRuntime::Initialize(const conduit::Node &options)
 #endif
 
     m_runtime_options = options;
+    m_info["runtime/type"] = "empty";
 }
 
 //-----------------------------------------------------------------------------
 void
 EmptyRuntime::Info(conduit::Node &out)
 {
-    out.reset();
-    out["runtime/type"] = "empty";
+    out.set(m_info);
 }
 
+//-----------------------------------------------------------------------------
+conduit::Node &
+EmptyRuntime::Info()
+{
+    return m_info;
+}
 
 //-----------------------------------------------------------------------------
 void
diff --git a/src/libs/ascent/runtimes/ascent_empty_runtime.hpp b/src/libs/ascent/runtimes/ascent_empty_runtime.hpp
index 0f93ee0ec..256531520 100644
--- a/src/libs/ascent/runtimes/ascent_empty_runtime.hpp
+++ b/src/libs/ascent/runtimes/ascent_empty_runtime.hpp
@@ -33,20 +33,23 @@ class ASCENT_API EmptyRuntime : public Runtime
     virtual ~EmptyRuntime();
 
     // Main runtime interface methods used by the ascent interface.
-    void  Initialize(const conduit::Node &options);
+    void                 Initialize(const conduit::Node &options) override;
 
-    void  Publish(const conduit::Node &data);
-    void  Execute(const conduit::Node &actions);
+    void                 Publish(const conduit::Node &data)   override;
+    void                 Execute(const conduit::Node &actions) override;
 
-    void  Info(conduit::Node &out);
+    void                 Info(conduit::Node &out) override;
+    conduit::Node       &Info() override;
 
-    void  Cleanup();
+    void  Cleanup() override;
 
 private:
     // holds options passed to initialize
     conduit::Node     m_runtime_options;
     // conduit node that (externally) holds the data from the simulation
     conduit::Node     m_data;
+    // conduit node that holds exec info
+    conduit::Node     m_info;
 };
 
 //-----------------------------------------------------------------------------
diff --git a/src/libs/ascent/runtimes/ascent_expression_eval.cpp b/src/libs/ascent/runtimes/ascent_expression_eval.cpp
index c0d1aeec1..442d4f6ba 100644
--- a/src/libs/ascent/runtimes/ascent_expression_eval.cpp
+++ b/src/libs/ascent/runtimes/ascent_expression_eval.cpp
@@ -237,58 +237,85 @@ Cache::~Cache()
 void
 register_builtin()
 {
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
-  flow::Workspace::register_filter_type();
+  // basic lang:
+  // boolean, integer, double, string, nan, null, identifier, dot access,
+  // if (conditional), binary operations (math, logical, etc)
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+
+  // scalar ops
+  //  max, min, abs, exp, log, pow
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+
+  // vec ops
+  //   vector, vector_magnitude
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+
+  // array ops
+  // access, replace, max, min, avg, sum
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+
+  // history ops
+  //  history, history_range, history_gradient, history_range_gradient
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+
+  // histogram ops
+  // histogram, entropy, pdf, cdf, quantile, bin_by_value, bin_by_index
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+
+  // mesh ops
+  //   cycle, time, field, topology, bounds, lineout
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+
+  // mesh field reduce ops
+  //  max reduce, min reduce, avg reduce, nan count, inf count, sum reduce
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+
+  // binning ops
+  //  binning, binning_axis, bin_by_index, point_and_axis, max_from_point
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
+  flow::Workspace::register_filter_type();
 
   initialize_functions();
   initialize_objects();
@@ -297,7 +324,7 @@ register_builtin()
 ExpressionEval::ExpressionEval(conduit::Node *data)
 {
   // wrap the pointer in a data object we can assume that this
-  // is a valid multidomain dataset
+  // is a valid multi-domain dataset
   conduit::Node *data_node = new conduit::Node();
   data_node->set_external(*data);
   m_data_object.reset(data_node);
@@ -365,18 +392,10 @@ initialize_functions()
   g_function_table.reset();
   conduit::Node *functions = &g_function_table;
 
-  //---------------------------------------------------------------------------
-
-  conduit::Node &array_avg_sig = (*functions)["avg"].append();
-  array_avg_sig["return_type"] = "double";
-  array_avg_sig["filter_name"] = "array_avg"; // matches the filter's type_name
-  array_avg_sig["args/arg1/type"] = "array"; // arg names match input port names
-  array_avg_sig["description"] = "Return the average of an array.";
-
   // -------------------------------------------------------------
   conduit::Node &array_replace_sig = (*functions)["replace"].append();
   array_replace_sig["return_type"] = "array";
-  array_replace_sig["filter_name"] = "replace"; // matches the filter's type_name
+  array_replace_sig["filter_name"] = "expr_array_replace"; // matches the filter's type_name
   array_replace_sig["args/arg1/type"] = "array";
   array_replace_sig["args/find/type"] = "double";
   array_replace_sig["args/find/description"] = "Value in the array to find and replace.";
@@ -387,17 +406,10 @@ initialize_functions()
   // -------------------------------------------------------------
   conduit::Node &nan_sig = (*functions)["nan"].append();
   nan_sig["return_type"] = "double";
-  nan_sig["filter_name"] = "nan"; // matches the filter's type_name
+  nan_sig["filter_name"] = "expr_nan"; // matches the filter's type_name
   nan_sig["args"] = conduit::DataType::empty();
   nan_sig["description"] = "Generates a NaN value.";
 
-  // -------------------------------------------------------------
-
-  conduit::Node &field_avg_sig = (*functions)["avg"].append();
-  field_avg_sig["return_type"] = "double";
-  field_avg_sig["filter_name"] = "field_avg";
-  field_avg_sig["args/arg1/type"] = "field";
-  field_avg_sig["description"] = "Return the field average of a field.";
 
   //---------------------------------------------------------------------------
 
@@ -406,7 +418,7 @@ initialize_functions()
   // things will happen (get a syntax error or something).
   conduit::Node &field_gradient_sig = (*functions)["gradient"].append();
   field_gradient_sig["return_type"] = "jitable";
-  field_gradient_sig["filter_name"] = "gradient";
+  field_gradient_sig["filter_name"] = "expr_jit_mesh_field_gradient";
   field_gradient_sig["args/field/type"] = "field";
   field_gradient_sig["description"] =
       "Return a derived field that is the gradient of a field.";
@@ -415,7 +427,7 @@ initialize_functions()
   //---------------------------------------------------------------------------
   conduit::Node &scalar_gradient_sig = (*functions)["gradient"].append();
   scalar_gradient_sig["return_type"] = "double";
-  scalar_gradient_sig["filter_name"] = "scalar_gradient";
+  scalar_gradient_sig["filter_name"] = "expr_history_gradient";
 
   //scalar_gradient_sig["args/expr_name/type"] = "string";
   scalar_gradient_sig["args/expr_name/type"] = "anytype";
@@ -436,11 +448,18 @@ initialize_functions()
 
   scalar_gradient_sig["description"] = "Return the temporal gradient of the given expression for the current point in time.";
 
+  // -------------------------------------------------------------
+  // NOTE: 2023-07-13 CYRUS
+  // `history_gradient` is a new user facing name for what was `gradient` applied to history
+  conduit::Node &hist_gradient_sig = (*functions)["history_gradient"].append();
+  // same sig as old "gradient_range"
+  hist_gradient_sig.set(scalar_gradient_sig);
+
   // -------------------------------------------------------------
 
   conduit::Node &array_gradient_sig = (*functions)["gradient_range"].append();
   array_gradient_sig["return_type"] = "array";
-  array_gradient_sig["filter_name"] = "gradient_range";
+  array_gradient_sig["filter_name"] = "expr_history_gradient_range";
 
   array_gradient_sig["args/expr_name/type"] = "anytype";
   array_gradient_sig["args/expr_name/description"] =
@@ -516,37 +535,146 @@ initialize_functions()
   first_relative_index and last_relative_index, 3). first_absolute_time and last_absolute_time, or 4). first_absolute_cycle and last_absolute_cycle.";
 
   // -------------------------------------------------------------
+  // NOTE: 2023-07-13 CYRUS
+  // `history_gradient_range` is a new user facing name for what was `gradient_range` applied to history
+  conduit::Node &hist_gradient_range_sig = (*functions)["history_gradient_range"].append();
+  // same sig as old "gradient_range"
+  hist_gradient_range_sig.set(array_gradient_sig);
+
+
+  //---------------------------------------------------------------------------
+  // abs()
+  //---------------------------------------------------------------------------
+  conduit::Node &abs_sig = (*functions)["abs"].append();
+  abs_sig["return_type"] = "scalar";
+  abs_sig["filter_name"] = "expr_scalar_abs";
+  abs_sig["args/arg1/type"] = "scalar";
+  abs_sig["description"] = "Return the absolute value of the input.";
+
+  //---------------------------------------------------------------------------
+  // exp()
+  //---------------------------------------------------------------------------
+  conduit::Node &exp_sig = (*functions)["exp"].append();
+  exp_sig["return_type"] = "double";
+  exp_sig["filter_name"] = "expr_scalar_exp";
+  exp_sig["args/arg1/type"] = "scalar";
+  exp_sig["description"] = "Return the base e exponential.";
+
+  //---------------------------------------------------------------------------
+  // pow()
+  //---------------------------------------------------------------------------
+  conduit::Node &pow_sig = (*functions)["pow"].append();
+  pow_sig["return_type"] = "double";
+  pow_sig["filter_name"] = "expr_scalar_pow";
+  pow_sig["args/arg1/type"] = "scalar";
+  pow_sig["args/arg2/type"] = "scalar";
+  pow_sig["description"] =
+    "Returns base raised to the power exponent."
+    " pow(base, exponent)";
+
+  //---------------------------------------------------------------------------
+  // log()
+  //---------------------------------------------------------------------------
+  conduit::Node &log_sig = (*functions)["log"].append();
+  log_sig["return_type"] = "double";
+  log_sig["filter_name"] = "expr_scalar_log";
+  log_sig["args/arg1/type"] = "scalar";
+  log_sig["description"] =
+    "Returns the natural logarithm of the argument";
+
+  // -------------------------------------------------------------
+  // vector()
+  // -------------------------------------------------------------
+  conduit::Node &vector = (*functions)["vector"].append();
+  vector["return_type"] = "vector";
+  vector["filter_name"] = "expr_vector";
+  vector["args/arg1/type"] = "scalar";
+  vector["args/arg2/type"] = "scalar";
+  vector["args/arg3/type"] = "scalar";
+  vector["description"] = "Return the 3D position vector for the input value.";
+
+  // -------------------------------------------------------------
+  // magnitude()
+  // -------------------------------------------------------------
+  conduit::Node &mag_sig = (*functions)["magnitude"].append();
+  mag_sig["return_type"] = "double";
+  mag_sig["filter_name"] = "expr_vector_magnitude";
+  mag_sig["args/arg1/type"] = "vector";
+  mag_sig["description"] = "Return the magnitude of the input vector.";
 
 
+  //---------------------------------------------------------------------------
+  //  field_nan_count() 
+  //---------------------------------------------------------------------------
   conduit::Node &field_nan_sig = (*functions)["field_nan_count"].append();
   field_nan_sig["return_type"] = "double";
-  field_nan_sig["filter_name"] = "field_nan_count";
+  field_nan_sig["filter_name"] = "expr_mesh_field_reduction_nan_count";
   field_nan_sig["args/arg1/type"] = "field"; // arg names match input port names
   field_nan_sig["description"] = "Return the number  of NaNs in a field.";
 
   //---------------------------------------------------------------------------
-
+  //  field_inf_count() 
+  //---------------------------------------------------------------------------
   conduit::Node &field_inf_sig = (*functions)["field_inf_count"].append();
   field_inf_sig["return_type"] = "double";
-  field_inf_sig["filter_name"] = "field_inf_count";
+  field_inf_sig["filter_name"] = "expr_mesh_field_reduction_inf_count";
   field_inf_sig["args/arg1/type"] = "field"; // arg names match input port names
   field_inf_sig["description"] =
       "Return the number  of -inf and +inf in a field.";
 
+
+  //---------------------------------------------------------------------------
+  //  min() 
+  //---------------------------------------------------------------------------
+
+  //---------------------------------------------------------------------------
+  conduit::Node &scalar_min_sig = (*functions)["min"].append();
+  scalar_min_sig["return_type"] = "double";
+  scalar_min_sig["filter_name"] = "expr_scalar_min";
+  scalar_min_sig["args/arg1/type"] = "scalar";
+  scalar_min_sig["args/arg2/type"] = "scalar";
+  scalar_min_sig["description"] = "Return the minimum of two scalars.";
+
+  //---------------------------------------------------------------------------
+  conduit::Node &array_min_sig = (*functions)["min"].append();
+  array_min_sig["return_type"] = "double";
+  array_min_sig["filter_name"] = "expr_array_reduction_min";
+  array_min_sig["args/arg1/type"] = "array";
+  array_min_sig["description"] = "Return the minimum of an array.";
+
+  //---------------------------------------------------------------------------
+  conduit::Node &field_min_sig = (*functions)["min"].append();
+  field_min_sig["return_type"] = "value_position";
+  field_min_sig["filter_name"] = "expr_mesh_field_reduction_min";
+  field_min_sig["args/arg1/type"] = "field";
+  field_min_sig["description"] =
+      "Return the minimum value from the meshvar. Its position is also "
+      "stored "
+      "and is accessible via the `position` function.";
+
+  //---------------------------------------------------------------------------
+  //  max()
   //---------------------------------------------------------------------------
 
+  //---------------------------------------------------------------------------
   conduit::Node &scalar_max_sig = (*functions)["max"].append();
   scalar_max_sig["return_type"] = "double";
-  scalar_max_sig["filter_name"] = "scalar_max";
+  scalar_max_sig["filter_name"] = "expr_scalar_max";
   scalar_max_sig["args/arg1/type"] = "scalar";
   scalar_max_sig["args/arg2/type"] = "scalar";
   scalar_max_sig["description"] = "Return the maximum of two scalars.";
 
   //---------------------------------------------------------------------------
+  conduit::Node &array_max_sig = (*functions)["max"].append();
+  array_max_sig["return_type"] = "double";
+  array_max_sig["filter_name"] = "expr_array_reduction_max";
+  array_max_sig["args/arg1/type"] = "array";
+  array_max_sig["description"] = "Return the maximum of an array.";
 
+  //---------------------------------------------------------------------------
   conduit::Node &field_max_sig = (*functions)["max"].append();
   field_max_sig["return_type"] = "value_position";
-  field_max_sig["filter_name"] = "field_max";
+  field_max_sig["filter_name"] = "expr_mesh_field_reduction_max";
   field_max_sig["args/arg1/type"] = "field";
   field_max_sig["description"] =
       "Return the maximum value from the meshvar. Its position is also "
@@ -554,132 +682,63 @@ initialize_functions()
       "and is accessible via the `position` function.";
 
   //---------------------------------------------------------------------------
-
-  conduit::Node &array_max_sig = (*functions)["max"].append();
-  array_max_sig["return_type"] = "double";
-  array_max_sig["filter_name"] = "array_max";
-  array_max_sig["args/arg1/type"] = "array";
-  array_max_sig["description"] = "Return the maximum of an array.";
-
+  //  avg()
   //---------------------------------------------------------------------------
 
-  conduit::Node &field_min_sig = (*functions)["min"].append();
-  field_min_sig["return_type"] = "value_position";
-  field_min_sig["filter_name"] = "field_min";
-  field_min_sig["args/arg1/type"] = "field";
-  field_min_sig["description"] =
-      "Return the minimum value from the meshvar. Its position is also "
-      "stored "
-      "and is accessible via the `position` function.";
-
   //---------------------------------------------------------------------------
+  conduit::Node &array_avg_sig = (*functions)["avg"].append();
+  array_avg_sig["return_type"] = "double";
+  array_avg_sig["filter_name"] = "expr_array_reduction_avg"; // matches the filter's type_name
+  array_avg_sig["args/arg1/type"] = "array"; // arg names match input port names
+  array_avg_sig["description"] = "Return the average of an array.";
 
-  conduit::Node &scalar_min_sig = (*functions)["min"].append();
-  scalar_min_sig["return_type"] = "double";
-  scalar_min_sig["filter_name"] = "scalar_min";
-  scalar_min_sig["args/arg1/type"] = "scalar";
-  scalar_min_sig["args/arg2/type"] = "scalar";
-  scalar_min_sig["description"] = "Return the minimum of two scalars.";
+  // -------------------------------------------------------------
+  conduit::Node &field_avg_sig = (*functions)["avg"].append();
+  field_avg_sig["return_type"] = "double";
+  field_avg_sig["filter_name"] = "expr_mesh_field_reduction_avg";
+  field_avg_sig["args/arg1/type"] = "field";
+  field_avg_sig["description"] = "Return the field average of a field.";
 
   //---------------------------------------------------------------------------
-
-  conduit::Node &array_min_sig = (*functions)["min"].append();
-  array_min_sig["return_type"] = "double";
-  array_min_sig["filter_name"] = "array_min";
-  array_min_sig["args/arg1/type"] = "array";
-  array_min_sig["description"] = "Return the minimum of an array.";
-
+  //  sum()
   //---------------------------------------------------------------------------
 
-  conduit::Node &field_sum_sig = (*functions)["sum"].append();
-  field_sum_sig["return_type"] = "double";
-  field_sum_sig["filter_name"] = "field_sum";
-  field_sum_sig["args/arg1/type"] = "field";
-  field_sum_sig["description"] = "Return the sum of a field.";
-
   //---------------------------------------------------------------------------
-
   conduit::Node &array_sum_sig = (*functions)["sum"].append();
   array_sum_sig["return_type"] = "double";
-  array_sum_sig["filter_name"] = "array_sum";
+  array_sum_sig["filter_name"] = "expr_array_reduction_sum";
   array_sum_sig["args/arg1/type"] = "array";
   array_sum_sig["description"] = "Return the sum of an array.";
 
   //---------------------------------------------------------------------------
+  conduit::Node &field_sum_sig = (*functions)["sum"].append();
+  field_sum_sig["return_type"] = "double";
+  field_sum_sig["filter_name"] = "expr_mesh_field_reduction_sum";
+  field_sum_sig["args/arg1/type"] = "field";
+  field_sum_sig["description"] = "Return the sum of a field.";
 
+  //---------------------------------------------------------------------------
+  //  cycle()
+  //---------------------------------------------------------------------------
   conduit::Node &cycle_sig = (*functions)["cycle"].append();
   cycle_sig["return_type"] = "int";
-  cycle_sig["filter_name"] = "cycle";
+  cycle_sig["filter_name"] = "expr_mesh_cycle";
   cycle_sig["args"] = conduit::DataType::empty();
   cycle_sig["description"] = "Return the current simulation cycle.";
 
   //---------------------------------------------------------------------------
-
+  //  time()
+  //---------------------------------------------------------------------------
   conduit::Node &time_sig = (*functions)["time"].append();
   time_sig["return_type"] = "double";
-  time_sig["filter_name"] = "time";
+  time_sig["filter_name"] = "expr_mesh_time";
   time_sig["args"] = conduit::DataType::empty();
   time_sig["description"] = "Return the current simulation time.";
 
   // -------------------------------------------------------------
-
-  conduit::Node &vector = (*functions)["vector"].append();
-  vector["return_type"] = "vector";
-  vector["filter_name"] = "vector";
-  vector["args/arg1/type"] = "scalar";
-  vector["args/arg2/type"] = "scalar";
-  vector["args/arg3/type"] = "scalar";
-  vector["description"] = "Return the 3D position vector for the input value.";
-
-  //---------------------------------------------------------------------------
-
-  conduit::Node &mag_sig = (*functions)["magnitude"].append();
-  mag_sig["return_type"] = "double";
-  mag_sig["filter_name"] = "magnitude";
-  mag_sig["args/arg1/type"] = "vector";
-  mag_sig["description"] = "Return the magnitude of the input vector.";
-
-  //---------------------------------------------------------------------------
-
-  conduit::Node &abs_sig = (*functions)["abs"].append();
-  abs_sig["return_type"] = "scalar";
-  abs_sig["filter_name"] = "abs";
-  abs_sig["args/arg1/type"] = "scalar";
-  abs_sig["description"] = "Return the absolute value of the input.";
-
-  // -------------------------------------------------------------
-
-  conduit::Node &exp_sig = (*functions)["exp"].append();
-  exp_sig["return_type"] = "double";
-  exp_sig["filter_name"] = "exp";
-  exp_sig["args/arg1/type"] = "scalar";
-  exp_sig["description"] = "Return the base e exponential.";
-
-  // -------------------------------------------------------------
-
-  conduit::Node &pow_sig = (*functions)["pow"].append();
-  pow_sig["return_type"] = "double";
-  pow_sig["filter_name"] = "pow";
-  pow_sig["args/arg1/type"] = "scalar";
-  pow_sig["args/arg2/type"] = "scalar";
-  pow_sig["description"] =
-    "Returns base raised to the power exponent."
-    " pow(base, exponent)";
-
-  // -------------------------------------------------------------
-
-  conduit::Node &log_sig = (*functions)["log"].append();
-  log_sig["return_type"] = "double";
-  log_sig["filter_name"] = "log";
-  log_sig["args/arg1/type"] = "scalar";
-  log_sig["description"] =
-    "Returns the natural logarithm of the argument";
-
-  // -------------------------------------------------------------
-
   conduit::Node &hist_sig = (*functions)["histogram"].append();
   hist_sig["return_type"] = "histogram";
-  hist_sig["filter_name"] = "histogram";
+  hist_sig["filter_name"] = "expr_histogram";
   hist_sig["args/arg1/type"] = "field";
   // In a flow filter, these become parameters
   hist_sig["args/num_bins/type"] = "int";
@@ -697,10 +756,11 @@ initialize_functions()
   hist_sig["description"] = "Return a histogram of the field.";
 
   //---------------------------------------------------------------------------
-
+  // history()
+  //---------------------------------------------------------------------------
   conduit::Node &history_sig = (*functions)["history"].append();
   history_sig["return_type"] = "anytype";
-  history_sig["filter_name"] = "history";
+  history_sig["filter_name"] = "expr_history";
 
   history_sig["args/expr_name/type"] = "anytype";
   history_sig["args/expr_name/description"] =
@@ -735,11 +795,12 @@ initialize_functions()
   used.";
 
   //---------------------------------------------------------------------------
-
+  // history_range()
+  //---------------------------------------------------------------------------
   conduit::Node &history_range_sig = (*functions)["history_range"].append();
   // history_range_sig["return_type"] = "anytype";
   history_range_sig["return_type"] = "array";
-  history_range_sig["filter_name"] = "history_range";
+  history_range_sig["filter_name"] = "expr_history_range";
 
   history_range_sig["args/expr_name/type"] = "anytype";
   history_range_sig["args/expr_name/description"] =
@@ -818,59 +879,92 @@ initialize_functions()
   .. note:: Exactly one of the following pairs of values must be provided: 1). first_absolute_index and last_absolute_index, 2). \
   first_relative_index and last_relative_index, 3). first_absolute_time and last_absolute_time, or 4). first_absolute_cycle and last_absolute_cycle.";
 
+  // -------------------------------------------------------------
+  // entropy()
   // -------------------------------------------------------------
   conduit::Node &entropy_sig = (*functions)["entropy"].append();
   entropy_sig["return_type"] = "double";
-  entropy_sig["filter_name"] = "entropy";
+  entropy_sig["filter_name"] = "expr_histogram_entropy";
   entropy_sig["args/hist/type"] = "histogram";
   entropy_sig["description"] =
       "Return the Shannon entropy given a histogram of the field.";
 
   //---------------------------------------------------------------------------
-
+  // pdf()
+  //---------------------------------------------------------------------------
   conduit::Node &pdf_sig = (*functions)["pdf"].append();
   pdf_sig["return_type"] = "histogram";
-  pdf_sig["filter_name"] = "pdf";
+  pdf_sig["filter_name"] = "expr_histogram_pdf";
   pdf_sig["args/hist/type"] = "histogram";
   pdf_sig["description"] =
       "Return the probability distribution function (pdf) from a histogram.";
 
   //---------------------------------------------------------------------------
-
+  // cdf()
+  //---------------------------------------------------------------------------
   conduit::Node &cdf_sig = (*functions)["cdf"].append();
   cdf_sig["return_type"] = "histogram";
-  cdf_sig["filter_name"] = "cdf";
+  cdf_sig["filter_name"] = "expr_histogram_cdf";
   cdf_sig["args/hist/type"] = "histogram";
   cdf_sig["description"] =
       "Return the cumulative distribution function (cdf) from a histogram.";
 
   //---------------------------------------------------------------------------
+  // quantile()
+  //---------------------------------------------------------------------------
+  conduit::Node &quantile_sig = (*functions)["quantile"].append();
+  quantile_sig["return_type"] = "double";
+  quantile_sig["filter_name"] = "expr_histogram_cdf_quantile";
+  quantile_sig["args/cdf/type"] = "histogram";
+  quantile_sig["args/cdf/description"] = "CDF of a histogram.";
 
+  quantile_sig["args/q/type"] = "double";
+  quantile_sig["args/q/description"] = "Quantile between 0 and 1 inclusive.";
+
+  quantile_sig["args/interpolation/type"] = "string";
+  quantile_sig["args/interpolation/optional"];
+  quantile_sig["args/interpolation/description"] =
+      "Specifies the interpolation \
+  method to use when the quantile lies between two data points ``i < j``: \n\n \
+  - linear (default): ``i + (j - i) * fraction``, where fraction is the \
+  fractional part of the index surrounded by ``i`` and ``j``. \n \
+  - lower: ``i``. \n \
+  - higher: ``j``. \n \
+  - nearest: ``i`` or ``j``, whichever is nearest. \n \
+  - midpoint: ``(i + j) / 2``";
+
+  quantile_sig["description"] = "Return the `q`-th quantile of the data along \
+  the axis of `cdf`. For example, if `q` is 0.5 the result is the value on the \
+  x-axis which 50 percent of the data lies below.";
+
+  //---------------------------------------------------------------------------
+  // bin()
+  //---------------------------------------------------------------------------
   // gets histogram bin by index
-  conduit::Node &bin_by_index_sig = (*functions)["bin"].append();
-  bin_by_index_sig["return_type"] = "double";
-  bin_by_index_sig["filter_name"] = "bin_by_index";
-  bin_by_index_sig["args/hist/type"] = "histogram";
-  bin_by_index_sig["args/bin/type"] = "int";
-  bin_by_index_sig["description"] =
+  conduit::Node &hist_bin_by_index_sig = (*functions)["bin"].append();
+  hist_bin_by_index_sig["return_type"] = "double";
+  hist_bin_by_index_sig["filter_name"] = "expr_histogram_bin_by_index";
+  hist_bin_by_index_sig["args/hist/type"] = "histogram";
+  hist_bin_by_index_sig["args/bin/type"] = "int"; // index?
+  hist_bin_by_index_sig["description"] =
       "Return the value of the bin at index `bin` of a histogram.";
 
   //---------------------------------------------------------------------------
-
   // gets histogram bin by value
-  conduit::Node &bin_by_value_sig = (*functions)["bin"].append();
-  bin_by_value_sig["return_type"] = "double";
-  bin_by_value_sig["filter_name"] = "bin_by_value";
-  bin_by_value_sig["args/hist/type"] = "histogram";
-  bin_by_value_sig["args/val/type"] = "scalar";
-  bin_by_value_sig["description"] =
+  conduit::Node &hist_bin_by_value_sig = (*functions)["bin"].append();
+  hist_bin_by_value_sig["return_type"] = "double";
+  hist_bin_by_value_sig["filter_name"] = "expr_histogram_bin_by_value";
+  hist_bin_by_value_sig["args/hist/type"] = "histogram";
+  hist_bin_by_value_sig["args/val/type"] = "scalar";
+  hist_bin_by_value_sig["description"] =
       "Return the value of the bin with axis-value `val` on the histogram.";
 
   //---------------------------------------------------------------------------
-
+  // field()
+  //---------------------------------------------------------------------------
   conduit::Node &field_sig = (*functions)["field"].append();
   field_sig["return_type"] = "field";
-  field_sig["filter_name"] = "field";
+  field_sig["filter_name"] = "expr_mesh_field";
   field_sig["args/field_name/type"] = "string";
   field_sig["args/component/type"] = "string";
   field_sig["args/component/optional"];
@@ -879,27 +973,57 @@ initialize_functions()
   field_sig["description"] = "Return a mesh field given a its name.";
 
   //---------------------------------------------------------------------------
-
+  // topo()
+  //---------------------------------------------------------------------------
   conduit::Node &topo_sig = (*functions)["topo"].append();
-  topo_sig["return_type"] = "topo";
-  topo_sig["filter_name"] = "topo";
+  topo_sig["return_type"] = "topology";
+  topo_sig["filter_name"] = "expr_mesh_topology";
   topo_sig["args/arg1/type"] = "string";
   topo_sig["description"] = "Return a mesh topology given a its name.";
 
   //---------------------------------------------------------------------------
+  // topology()
+  //---------------------------------------------------------------------------
+  conduit::Node &topology_sig = (*functions)["topology"].append();
+  topology_sig["return_type"] = "topology";
+  topology_sig["filter_name"] = "expr_mesh_topology";
+  topology_sig["args/arg1/type"] = "string";
+  topology_sig["description"] = "Return a mesh topology given a its name.";
 
+  //---------------------------------------------------------------------------
+  // bounds()
+  //---------------------------------------------------------------------------
   conduit::Node &bounds_sig = (*functions)["bounds"].append();
   bounds_sig["return_type"] = "aabb";
-  bounds_sig["filter_name"] = "bounds";
+  bounds_sig["filter_name"] = "expr_mesh_bounds";
   bounds_sig["args/topology/type"] = "string";
   bounds_sig["args/topology/optional"];
   bounds_sig["description"] = "Returns the spatial bounds of a mesh.";
 
-  // -------------------------------------------------------------
+  //---------------------------------------------------------------------------
+  // lineout()
+  //---------------------------------------------------------------------------
+  conduit::Node &lineout = (*functions)["lineout"].append();
+  lineout["return_type"] = "array";
+  lineout["filter_name"] = "expr_mesh_lineout";
+  lineout["args/samples/type"] = "int";
+  lineout["args/start/type"] = "vector";
+  lineout["args/end/type"] = "vector";
+  lineout["args/fields/type"] = "list";
+  lineout["args/fields/optional"];
+  lineout["args/empty_val/type"] = "double";
+  lineout["args/empty_val/optional"];
+  lineout["description"] = "returns a sampled based line out";
+
+
 
+
+  //---------------------------------------------------------------------------
+  // point_and_axis()
+  //---------------------------------------------------------------------------
   conduit::Node &point_and_axis_sig = (*functions)["point_and_axis"].append();
   point_and_axis_sig["return_type"] = "bin";
-  point_and_axis_sig["filter_name"] = "point_and_axis";
+  point_and_axis_sig["filter_name"] = "expr_mesh_binning_point_and_axis";
   point_and_axis_sig["args/binning/type"] = "binning";
   point_and_axis_sig["args/axis/type"] = "string";
   point_and_axis_sig["args/threshold/type"] = "double";
@@ -914,16 +1038,17 @@ initialize_functions()
 
   conduit::Node &bin_sig = (*functions)["bin"].append();
   bin_sig["return_type"] = "bin";
-  bin_sig["filter_name"] = "bin";
+  bin_sig["filter_name"] = "expr_mesh_binning_bin_by_index";
   bin_sig["args/binning/type"] = "binning";
   bin_sig["args/index/type"] = "int";
   bin_sig["description"] = "returns a bin from a binning by index";
 
-  // -------------------------------------------------------------
-
+  //---------------------------------------------------------------------------
+  // max_from_point()
+  //---------------------------------------------------------------------------
   conduit::Node &max_from_point_sig = (*functions)["max_from_point"].append();
   max_from_point_sig["return_type"] = "value_position";
-  max_from_point_sig["filter_name"] = "max_from_point";
+  max_from_point_sig["filter_name"] = "expr_mesh_binning_max_from_point";
   max_from_point_sig["args/binning/type"] = "binning";
   max_from_point_sig["args/axis/type"] = "string";
   max_from_point_sig["args/point/type"] = "double";
@@ -931,52 +1056,15 @@ initialize_functions()
       "returns the closest max"
       " value from a reference point on an axis";
 
-  // -------------------------------------------------------------
-
-  conduit::Node &lineout = (*functions)["lineout"].append();
-  lineout["return_type"] = "array";
-  lineout["filter_name"] = "lineout";
-  lineout["args/samples/type"] = "int";
-  lineout["args/start/type"] = "vector";
-  lineout["args/end/type"] = "vector";
-  lineout["args/fields/type"] = "list";
-  lineout["args/fields/optional"];
-  lineout["args/empty_val/type"] = "double";
-  lineout["args/empty_val/optional"];
-  lineout["description"] = "returns a sampled based line out";
-
-  // -------------------------------------------------------------
-
-  conduit::Node &quantile_sig = (*functions)["quantile"].append();
-  quantile_sig["return_type"] = "double";
-  quantile_sig["filter_name"] = "quantile";
-  quantile_sig["args/cdf/type"] = "histogram";
-  quantile_sig["args/cdf/description"] = "CDF of a histogram.";
-
-  quantile_sig["args/q/type"] = "double";
-  quantile_sig["args/q/description"] = "Quantile between 0 and 1 inclusive.";
-
-  quantile_sig["args/interpolation/type"] = "string";
-  quantile_sig["args/interpolation/optional"];
-  quantile_sig["args/interpolation/description"] =
-      "Specifies the interpolation \
-  method to use when the quantile lies between two data points ``i < j``: \n\n \
-  - linear (default): ``i + (j - i) * fraction``, where fraction is the \
-  fractional part of the index surrounded by ``i`` and ``j``. \n \
-  - lower: ``i``. \n \
-  - higher: ``j``. \n \
-  - nearest: ``i`` or ``j``, whichever is nearest. \n \
-  - midpoint: ``(i + j) / 2``";
-
-  quantile_sig["description"] = "Return the `q`-th quantile of the data along \
-  the axis of `cdf`. For example, if `q` is 0.5 the result is the value on the \
-  x-axis which 50 percent of the data lies below.";
 
   //---------------------------------------------------------------------------
-
+  // axis()
+  //---------------------------------------------------------------------------
+  
+  //---------------------------------------------------------------------------
   conduit::Node &axis_sig = (*functions)["axis"].append();
   axis_sig["return_type"] = "axis";
-  axis_sig["filter_name"] = "axis";
+  axis_sig["filter_name"] = "expr_mesh_binning_axis";
   axis_sig["args/name/type"] = "string";
   axis_sig["args/name/description"] =
       "The name of a scalar field on the mesh "
@@ -1019,10 +1107,9 @@ initialize_functions()
       "put into the bins on the boundaries.";
 
   //---------------------------------------------------------------------------
-
   conduit::Node &axis_sig2 = (*functions)["axis"].append();
   axis_sig2["return_type"] = "axis";
-  axis_sig2["filter_name"] = "axis";
+  axis_sig2["filter_name"] = "expr_mesh_binning_axis";
   axis_sig2["args/var/type"] = "string";
   axis_sig2["args/var/description"] = "One of the strings ``'x', 'y', 'z'`` "
                                       "corresponding to a spacial coordinate.";
@@ -1043,10 +1130,11 @@ initialize_functions()
       "of the strings ``'x', 'y', 'z'``";
 
   //---------------------------------------------------------------------------
-
+  // binning()
+  //---------------------------------------------------------------------------
   conduit::Node &binning_sig = (*functions)["binning"].append();
   binning_sig["return_type"] = "binning";
-  binning_sig["filter_name"] = "binning";
+  binning_sig["filter_name"] = "expr_mesh_binning";
   binning_sig["args/reduction_var/type"] = "string";
   binning_sig["args/reduction_var/description"] =
       "The variable being reduced. Either the name of a scalar field on the "
@@ -1094,7 +1182,7 @@ initialize_functions()
 //      "List of Axis objects which define the bin axes.";
 //  binning_sig2["args/empty_val/type"] = "scalar";
 //  binning_sig2["args/empty_val/optional"];
-//  binning_sig2["args/topo/type"] = "topo";
+//  binning_sig2["args/topo/type"] = "topology";
 //  binning_sig2["args/topo/optional"];
 //  binning_sig2["args/topo/description"] =
 //      "The topology to bin. Defaults to the "
@@ -1116,67 +1204,71 @@ initialize_functions()
 //
   //---------------------------------------------------------------------------
 
-  // this does not jit but binning_value does
-  conduit::Node &paint_binning_sig = (*functions)["paint_binning"].append();
-  paint_binning_sig["return_type"] = "field";
-  paint_binning_sig["filter_name"] = "paint_binning";
-  paint_binning_sig["args/binning/type"] = "binning";
-  paint_binning_sig["args/binning/description"] =
-      "The values in ``binning`` are used to generate the new field.";
-  paint_binning_sig["args/name/type"] = "string";
-  paint_binning_sig["args/name/optional"];
-  paint_binning_sig["args/name/description"] =
-      "The name of the new field to be generated. If not specified, a name "
-      "is automatically generated and the field is treated as a temporary and "
-      "removed from the dataset when the expression is done executing.";
-  paint_binning_sig["args/default_val/type"] = "scalar";
-  paint_binning_sig["args/default_val/optional"];
-  paint_binning_sig["args/default_val/description"] =
-      "The value given to elements which do not fall into "
-      "any of the bins. Defaults to ``0``.";
-  paint_binning_sig["args/topo/type"] = "topo";
-  paint_binning_sig["args/topo/optional"];
-  paint_binning_sig["args/topo/description"] =
-      " The topology to paint the bin values back onto. Defaults to the "
-      "topology associated with the bin axes. This topology must have "
-      "all the fields used for the axes of ``binning``. It only makes sense "
-      "to specify this when the ``bin_axes`` are a subset of ``x``, ``y``, "
-      "``z``. Additionally, it must be specified in this case since there is "
-      "not enough info to infer the topology assuming there are multiple "
-      "topologies in the dataset.";
-  paint_binning_sig["args/assoc/type"] = "topo";
-  paint_binning_sig["args/assoc/optional"];
-  paint_binning_sig["args/assoc/description"] =
-      "Defaults to the association infered from the bin axes and and "
-      "reduction variable. The association of the resultant field. This "
-      "topology must have all the fields used for the axes of ``binning``. It "
-      "only makes sense to specify this when the ``bin_axes`` are a subset of "
-      "``x``, ``y``, ``z``.";
-  paint_binning_sig["description"] =
-      "Paints back the bin values onto an existing mesh by binning the "
-      "elements of the mesh and creating a new field there the value at each "
-      "element is the value in the bin it falls into.";
-
-  //---------------------------------------------------------------------------
-
-  conduit::Node &binning_mesh_sig = (*functions)["binning_mesh"].append();
-  binning_mesh_sig["return_type"] = "field";
-  binning_mesh_sig["filter_name"] = "binning_mesh";
-  binning_mesh_sig["args/binning/type"] = "binning";
-  binning_mesh_sig["args/binning/description"] =
-      "The values in ``binning`` are used to generate the new field.";
-  binning_mesh_sig["args/name/type"] = "string";
-  binning_mesh_sig["args/name/optional"];
-  binning_mesh_sig["args/name/description"] =
-      "The name of the new field to be generated, the corresponding topology "
-      "topology and coordinate sets will be named '``name``_topo' and "
-      "'``name``_coords' respectively. If not specified, a name is "
-      "automatically generated and the field is treated as a temporary and "
-      "removed from the dataset when the expression is done executing.";
-  binning_mesh_sig["description"] =
-      "A binning with 3 or fewer dimensions will be output as a new element "
-      "associated field on a new topology on the dataset. This is useful for "
-      "directly visualizing the binning.";
+  // 2023-07-07 CYRUS NOTE
+  // I DON"T THINK paint_binning or binning_mesh exprs are 
+  // fully wired up or tests, I am commenting them out 
+
+  // // this does not jit but binning_value does
+  // conduit::Node &paint_binning_sig = (*functions)["paint_binning"].append();
+  // paint_binning_sig["return_type"] = "field";
+  // paint_binning_sig["filter_name"] = "paint_binning";
+  // paint_binning_sig["args/binning/type"] = "binning";
+  // paint_binning_sig["args/binning/description"] =
+  //     "The values in ``binning`` are used to generate the new field.";
+  // paint_binning_sig["args/name/type"] = "string";
+  // paint_binning_sig["args/name/optional"];
+  // paint_binning_sig["args/name/description"] =
+  //     "The name of the new field to be generated. If not specified, a name "
+  //     "is automatically generated and the field is treated as a temporary and "
+  //     "removed from the dataset when the expression is done executing.";
+  // paint_binning_sig["args/default_val/type"] = "scalar";
+  // paint_binning_sig["args/default_val/optional"];
+  // paint_binning_sig["args/default_val/description"] =
+  //     "The value given to elements which do not fall into "
+  //     "any of the bins. Defaults to ``0``.";
+  // paint_binning_sig["args/topo/type"] = "topology";
+  // paint_binning_sig["args/topo/optional"];
+  // paint_binning_sig["args/topo/description"] =
+  //     " The topology to paint the bin values back onto. Defaults to the "
+  //     "topology associated with the bin axes. This topology must have "
+  //     "all the fields used for the axes of ``binning``. It only makes sense "
+  //     "to specify this when the ``bin_axes`` are a subset of ``x``, ``y``, "
+  //     "``z``. Additionally, it must be specified in this case since there is "
+  //     "not enough info to infer the topology assuming there are multiple "
+  //     "topologies in the dataset.";
+  // paint_binning_sig["args/assoc/type"] = "topology";
+  // paint_binning_sig["args/assoc/optional"];
+  // paint_binning_sig["args/assoc/description"] =
+  //     "Defaults to the association inferred from the bin axes and and "
+  //     "reduction variable. The association of the resultant field. This "
+  //     "topology must have all the fields used for the axes of ``binning``. It "
+  //     "only makes sense to specify this when the ``bin_axes`` are a subset of "
+  //     "``x``, ``y``, ``z``.";
+  // paint_binning_sig["description"] =
+  //     "Paints back the bin values onto an existing mesh by binning the "
+  //     "elements of the mesh and creating a new field there the value at each "
+  //     "element is the value in the bin it falls into.";
+  //
+  // //---------------------------------------------------------------------------
+  //
+  // conduit::Node &binning_mesh_sig = (*functions)["binning_mesh"].append();
+  // binning_mesh_sig["return_type"] = "field";
+  // binning_mesh_sig["filter_name"] = "binning_mesh";
+  // binning_mesh_sig["args/binning/type"] = "binning";
+  // binning_mesh_sig["args/binning/description"] =
+  //     "The values in ``binning`` are used to generate the new field.";
+  // binning_mesh_sig["args/name/type"] = "string";
+  // binning_mesh_sig["args/name/optional"];
+  // binning_mesh_sig["args/name/description"] =
+  //     "The name of the new field to be generated, the corresponding topology "
+  //     "topology and coordinate sets will be named '``name``_topo' and "
+  //     "'``name``_coords' respectively. If not specified, a name is "
+  //     "automatically generated and the field is treated as a temporary and "
+  //     "removed from the dataset when the expression is done executing.";
+  // binning_mesh_sig["description"] =
+  //     "A binning with 3 or fewer dimensions will be output as a new element "
+  //     "associated field on a new topology on the dataset. This is useful for "
+  //     "directly visualizing the binning.";
 
   //---------------------------------------------------------------------------
   // Jitable Functions
@@ -1186,31 +1278,54 @@ initialize_functions()
   // filter_name is passed to JitFilter so that it can determine which function
   // to execute
 
+  //---------------------------------------------------------------------------
+  // min(field, scalar)
+  conduit::Node &field_field_min_sig = (*functions)["min"].append();
+  field_field_min_sig["return_type"] = "jitable";
+  field_field_min_sig["filter_name"] = "expr_jit_mesh_field_min";
+  field_field_min_sig["args/arg1/type"] = "field";
+  field_field_min_sig["args/arg2/type"] = "scalar";
+  field_field_min_sig["description"] =
+      "Return a derived field that is the min of a field and a scalar.";
+
+  //---------------------------------------------------------------------------
+  // min(field, field)
+  field_field_min_sig["jitable"];
+  conduit::Node &field_scalar_min_sig = (*functions)["min"].append();
+  field_scalar_min_sig["return_type"] = "jitable";
+  field_scalar_min_sig["filter_name"] = "expr_jit_mesh_field_min";
+  field_scalar_min_sig["args/arg1/type"] = "field";
+  field_scalar_min_sig["args/arg2/type"] = "field";
+  field_scalar_min_sig["description"] =
+      "Return a derived field that is the min of two fields.";
+  field_scalar_min_sig["jitable"];
+
+  //---------------------------------------------------------------------------
+  // max(field, scalar)
   conduit::Node &field_scalar_max_sig = (*functions)["max"].append();
   field_scalar_max_sig["return_type"] = "jitable";
-  field_scalar_max_sig["filter_name"] = "field_field_max";
+  field_scalar_max_sig["filter_name"] = "expr_jit_mesh_field_max";
   field_scalar_max_sig["args/arg1/type"] = "field";
   field_scalar_max_sig["args/arg2/type"] = "scalar";
   field_scalar_max_sig["description"] =
-      "Return a derived field that is the max of two fields.";
+      "Return a derived field that is the max of a field and a scalar.";
   field_scalar_max_sig["jitable"];
 
   //---------------------------------------------------------------------------
-
-  conduit::Node &field_field_min_sig = (*functions)["min"].append();
-  field_field_min_sig["return_type"] = "jitable";
-  field_field_min_sig["filter_name"] = "field_field_min";
-  field_field_min_sig["args/arg1/type"] = "field";
-  field_field_min_sig["args/arg2/type"] = "field";
-  field_field_min_sig["description"] =
-      "Return a derived field that is the min of two fields.";
-  field_field_min_sig["jitable"];
+  // max(field, field)
+  conduit::Node &field_field_max_sig = (*functions)["max"].append();
+  field_field_max_sig["return_type"] = "jitable";
+  field_field_max_sig["filter_name"] = "expr_jit_mesh_field_max";
+  field_field_max_sig["args/arg1/type"] = "field";
+  field_field_max_sig["args/arg2/type"] = "field";
+  field_field_max_sig["description"] =
+      "Return a derived field that is the max of two fields.";
+  field_field_max_sig["jitable"];
 
   //---------------------------------------------------------------------------
-
   conduit::Node &field_sin_sig = (*functions)["sin"].append();
   field_sin_sig["return_type"] = "jitable";
-  field_sin_sig["filter_name"] = "field_sin";
+  field_sin_sig["filter_name"] = "expr_jit_mesh_field_sin";
   field_sin_sig["args/arg1/type"] = "field";
   field_sin_sig["description"] =
       "Return a derived field that is the sin of a field.";
@@ -1220,18 +1335,18 @@ initialize_functions()
 
   conduit::Node &field_pow_sig = (*functions)["pow"].append();
   field_pow_sig["return_type"] = "jitable";
-  field_pow_sig["filter_name"] = "field_pow";
+  field_pow_sig["filter_name"] = "expr_jit_mesh_field_pow";
   field_pow_sig["args/arg1/type"] = "field";
   field_pow_sig["args/arg1/type"] = "scalar";
   field_pow_sig["description"] =
-      "Return a derived field that is the pow(field,exponent) of a field.";
+      "Return a derived field that is the pow(field, exponent) of a field.";
   field_pow_sig["jitable"];
 
   //---------------------------------------------------------------------------
 
   conduit::Node &field_abs_sig = (*functions)["abs"].append();
   field_abs_sig["return_type"] = "jitable";
-  field_abs_sig["filter_name"] = "field_abs";
+  field_abs_sig["filter_name"] = "expr_jit_mesh_field_abs";
   field_abs_sig["args/arg1/type"] = "field";
   field_abs_sig["description"] =
       "Return a derived field that is the absolute value of a field.";
@@ -1241,7 +1356,7 @@ initialize_functions()
 
   conduit::Node &field_sqrt_sig = (*functions)["sqrt"].append();
   field_sqrt_sig["return_type"] = "jitable";
-  field_sqrt_sig["filter_name"] = "field_sqrt";
+  field_sqrt_sig["filter_name"] = "expr_jit_mesh_field_sqrt";
   field_sqrt_sig["args/arg1/type"] = "field";
   field_sqrt_sig["description"] =
       "Return a derived field that is the square root value of a field.";
@@ -1252,7 +1367,7 @@ initialize_functions()
 
   conduit::Node &field_curl_sig = (*functions)["curl"].append();
   field_curl_sig["return_type"] = "jitable";
-  field_curl_sig["filter_name"] = "curl";
+  field_curl_sig["filter_name"] = "expr_jit_mesh_field_curl";
   field_curl_sig["args/field/type"] = "field";
   field_curl_sig["description"] =
       "Return a derived field that is the curl of a vector field.";
@@ -1262,7 +1377,7 @@ initialize_functions()
 
   conduit::Node &field_magnitude_sig = (*functions)["magnitude"].append();
   field_magnitude_sig["return_type"] = "jitable";
-  field_magnitude_sig["filter_name"] = "magnitude";
+  field_magnitude_sig["filter_name"] = "expr_jit_mesh_field_vector_magnitude";
   field_magnitude_sig["args/vector/type"] = "field";
   field_magnitude_sig["description"] =
       "Return a derived field that is the magnitude of a vector field.";
@@ -1272,7 +1387,7 @@ initialize_functions()
 
   conduit::Node &field_vector = (*functions)["vector"].append();
   field_vector["return_type"] = "jitable";
-  field_vector["filter_name"] = "vector";
+  field_vector["filter_name"] = "expr_jit_mesh_field_vector_compose";
   field_vector["args/arg1/type"] = "field";
   field_vector["args/arg2/type"] = "field";
   field_vector["args/arg3/type"] = "field";
@@ -1280,56 +1395,79 @@ initialize_functions()
   field_vector["jitable"];
 
   //---------------------------------------------------------------------------
-
-  conduit::Node &derived_field = (*functions)["derived_field"].append();
-  derived_field["return_type"] = "jitable";
-  derived_field["filter_name"] = "derived_field";
-  derived_field["args/arg1/type"] = "scalar";
-  derived_field["args/arg1/description"] =
-      "The scalar to be cast to a derived field.";
-  derived_field["args/topo/type"] = "string";
-  derived_field["args/topo/optional"];
-  derived_field["args/topo/description"] =
-      "The topology to put the derived field onto. The language tries to infer "
+  // NOTE:  2023-07-12 cyrush:
+  // changed `derived_field` to `constant_field`
+  conduit::Node &const_field = (*functions)["constant_field"].append();
+  const_field["return_type"] = "jitable";
+  const_field["filter_name"] = "expr_jit_mesh_field_constant";
+  const_field["args/arg1/type"] = "scalar";
+  const_field["args/arg1/description"] =
+      "The scalar to be cast to a constant mesh field.";
+  const_field["args/topo/type"] = "string";
+  const_field["args/topo/optional"];
+  const_field["args/topo/description"] =
+      "The topology to put the field onto. The language tries to infer "
       "this if not specified.";
-  derived_field["args/assoc/type"] = "string";
-  derived_field["args/assoc/optional"];
-  derived_field["args/assoc/description"] =
-      "The association of the derived field. The language tries to infer "
+  const_field["args/assoc/type"] = "string";
+  const_field["args/assoc/optional"];
+  const_field["args/assoc/description"] =
+      "The association of the field. The language tries to infer "
       "this if not specified.";
-  derived_field["description"] =
-      "Cast a scalar to a derived field (type `jitable`).";
-  derived_field["jitable"];
-
-  //---------------------------------------------------------------------------
-
-  conduit::Node &derived_field2 = (*functions)["derived_field"].append();
-  derived_field2["return_type"] = "jitable";
-  derived_field2["filter_name"] = "derived_field";
-  derived_field2["args/arg1/type"] = "field";
-  derived_field2["args/arg1/description"] =
-      "The scalar to be cast to a derived field.";
-  derived_field2["args/topo/type"] = "string";
-  derived_field2["args/topo/optional"];
-  derived_field2["args/topo/description"] =
-      "The topology to put the derived field onto. The language tries to infer "
+  const_field["description"] =
+      "Cast a scalar to a constant mesh field (type `jitable`).";
+  const_field["jitable"];
+
+  //---------------------------------------------------------------------------
+  // NOTE:  2023-07-12 cyrush:
+  // changed `derived_field` to `constant_field`
+  conduit::Node &const_field2 = (*functions)["constant_field"].append();
+  const_field2["return_type"] = "jitable";
+  const_field2["filter_name"] = "expr_jit_mesh_field_constant";
+  const_field2["args/arg1/type"] = "field";
+  const_field2["args/arg1/description"] =
+      "The scalar to be cast to a constant mesh field.";
+  const_field2["args/topo/type"] = "string";
+  const_field2["args/topo/optional"];
+  const_field2["args/topo/description"] =
+      "The topology to put the field onto. The language tries to infer "
       "this if not specified.";
-  derived_field2["args/assoc/type"] = "string";
-  derived_field2["args/assoc/optional"];
-  derived_field2["args/assoc/description"] =
-      "The association of the derived field. The language tries to infer "
+  const_field2["args/assoc/type"] = "string";
+  const_field2["args/assoc/optional"];
+  const_field2["args/assoc/description"] =
+      "The association of the field. The language tries to infer "
       "this if not specified.";
-  derived_field2["description"] =
-      "Used to explicitly specify the topology and association of a derived "
+  const_field2["description"] =
+      "Used to explicitly specify the topology and association of a constant "
       "field (e.g. in case it cannot be inferred or needs to be changed).";
-  derived_field2["jitable"];
+  const_field2["jitable"];
+
+  //---------------------------------------------------------------------------
+  conduit::Node &recenter_sig = (*functions)["recenter"].append();
+  recenter_sig["return_type"] = "jitable";
+  recenter_sig["filter_name"] = "expr_jit_mesh_field_recenter";
+  recenter_sig["args/field/type"] = "field";
+  recenter_sig["args/mode/type"] = "string";
+  recenter_sig["args/mode/optional"] = "string";
+  recenter_sig["args/mode/description"] =
+      "One of ``'toggle', 'vertex', 'element'``. Defaults to ``'toggle'``.";
+  recenter_sig["description"] = "Recenter a field from vertex association to "
+                                "element association or vice versa.";
+  recenter_sig["jitable"];
+
+  //---------------------------------------------------------------------------
+  conduit::Node &rand_sig = (*functions)["rand"].append();
+  rand_sig["return_type"] = "jitable";
+  rand_sig["filter_name"] = "expr_jit_rand";
+  rand_sig["description"] = "Return a random number between 0 and 1.";
+  rand_sig["jitable"];
+
 
   //---------------------------------------------------------------------------
 
   // essentially the jit version of paint_binning
   conduit::Node &binning_value_sig = (*functions)["binning_value"].append();
   binning_value_sig["return_type"] = "jitable";
-  binning_value_sig["filter_name"] = "binning_value";
+  binning_value_sig["filter_name"] = "expr_jit_mesh_binning_value"; // still not a great name
   binning_value_sig["args/binning/type"] = "binning";
   binning_value_sig["args/binning/description"] =
       "The ``binning`` to lookup values in.";
@@ -1338,7 +1476,7 @@ initialize_functions()
   binning_value_sig["args/default_val/description"] =
       "The value given to elements which do not fall into "
       "any of the bins. Defaults to ``0``.";
-  binning_value_sig["args/topo/type"] = "topo";
+  binning_value_sig["args/topo/type"] = "topology";
   binning_value_sig["args/topo/optional"];
   binning_value_sig["args/topo/description"] =
       "The topology to bin. Defaults to the "
@@ -1346,7 +1484,7 @@ initialize_functions()
       "all the fields used for the axes of ``binning``. It only makes sense "
       "to specify this when the ``bin_axes`` are a subset of ``x``, ``y``, "
       "``z``.";
-  binning_value_sig["args/assoc/type"] = "topo";
+  binning_value_sig["args/assoc/type"] = "topology";
   binning_value_sig["args/assoc/optional"];
   binning_value_sig["args/assoc/description"] =
       "The association of the resultant field. Defaults to the association "
@@ -1360,27 +1498,6 @@ initialize_functions()
 
   //---------------------------------------------------------------------------
 
-  conduit::Node &rand_sig = (*functions)["rand"].append();
-  rand_sig["return_type"] = "jitable";
-  rand_sig["filter_name"] = "rand";
-  rand_sig["description"] = "Return a random number between 0 and 1.";
-  rand_sig["jitable"];
-
-  //---------------------------------------------------------------------------
-
-  conduit::Node &recenter_sig = (*functions)["recenter"].append();
-  recenter_sig["return_type"] = "jitable";
-  recenter_sig["filter_name"] = "recenter";
-  recenter_sig["args/field/type"] = "field";
-  recenter_sig["args/mode/type"] = "string";
-  recenter_sig["args/mode/optional"] = "string";
-  recenter_sig["args/mode/description"] =
-      "One of ``'toggle', 'vertex', 'element'``. Defaults to ``'toggle'``.";
-  recenter_sig["description"] = "Recenter a field from vertex association to "
-                                "element association or vice versa.";
-  recenter_sig["jitable"];
-  //---------------------------------------------------------------------------
-
   count_params();
   //functions->save("functions.json", "json");
 }
@@ -1403,7 +1520,7 @@ initialize_objects()
   value_position["value/type"] = "double";
   value_position["position/type"] = "vector";
 
-  conduit::Node &topo = (*objects)["topo/attrs"];
+  conduit::Node &topo = (*objects)["topology/attrs"];
   topo["cell/type"] = "cell";
   topo["cell/description"] = "Holds ``jitable`` cell attributes.";
   topo["vertex/type"] = "vertex";
diff --git a/src/libs/ascent/runtimes/ascent_flow_runtime.cpp b/src/libs/ascent/runtimes/ascent_flow_runtime.cpp
index 171887850..13a231203 100644
--- a/src/libs/ascent/runtimes/ascent_flow_runtime.cpp
+++ b/src/libs/ascent/runtimes/ascent_flow_runtime.cpp
@@ -124,10 +124,18 @@ FlowRuntime::Info(conduit::Node &out)
     out.set(m_info);
 }
 
+//-----------------------------------------------------------------------------
+conduit::Node &
+FlowRuntime::Info()
+{
+    return m_info;
+}
+
 //-----------------------------------------------------------------------------
 void
 FlowRuntime::Cleanup()
 {
+
 }
 
 //-----------------------------------------------------------------------------
diff --git a/src/libs/ascent/runtimes/ascent_flow_runtime.hpp b/src/libs/ascent/runtimes/ascent_flow_runtime.hpp
index e17d082cd..1d613d6ca 100644
--- a/src/libs/ascent/runtimes/ascent_flow_runtime.hpp
+++ b/src/libs/ascent/runtimes/ascent_flow_runtime.hpp
@@ -39,14 +39,15 @@ class ASCENT_API FlowRuntime : public Runtime
     virtual ~FlowRuntime();
 
     // Main runtime interface methods used by the ascent interface.
-    void  Initialize(const conduit::Node &options);
+    void  Initialize(const conduit::Node &options) override;
 
-    void  Publish(const conduit::Node &data);
-    void  Execute(const conduit::Node &actions);
+    void  Publish(const conduit::Node &data)    override;
+    void  Execute(const conduit::Node &actions) override;
 
-    void  Info(conduit::Node &out);
+    void                 Info(conduit::Node &out) override;
+    conduit::Node       &Info() override;
 
-    void  Cleanup();
+    void  Cleanup() override;
 
 private:
     // holds options passed to initialize
diff --git a/src/libs/ascent/runtimes/ascent_main_runtime.cpp b/src/libs/ascent/runtimes/ascent_main_runtime.cpp
index 88b171eea..d10c5cc76 100644
--- a/src/libs/ascent/runtimes/ascent_main_runtime.cpp
+++ b/src/libs/ascent/runtimes/ascent_main_runtime.cpp
@@ -63,7 +63,6 @@
 using namespace conduit;
 using namespace std;
 
-
 //-----------------------------------------------------------------------------
 // -- begin ascent:: --
 //-----------------------------------------------------------------------------
@@ -294,25 +293,29 @@ AscentRuntime::Initialize(const conduit::Node &options)
 
     m_runtime_options = options;
 
+    // NOTE:
+    // if both ghost_field_name and ghost_field_names
+    // are present, ghost_field_names is used
     if(options.has_path("ghost_field_name"))
     {
       if(options["ghost_field_name"].dtype().is_string())
       {
         m_ghost_fields.reset();
-
-        std::string ghost_name = options["ghost_field_name"].as_string();
-        m_ghost_fields.append() = ghost_name;
+        m_ghost_fields.append().set(options["ghost_field_name"]);
       }
       else if(options["ghost_field_name"].dtype().is_list())
       {
+        m_ghost_fields.reset();
         const int num_children = options["ghost_field_name"].number_of_children();
         for(int i = 0; i < num_children; ++i)
         {
           const conduit::Node &child = options["ghost_field_name"].child(i);
           if(!child.dtype().is_string())
           {
-            ASCENT_ERROR("ghost_field_name list child is not a string");
+            ASCENT_ERROR("ghost_field_name list child "
+                         << i << " is not a string");
           }
+          m_ghost_fields.append().set(child);
         }
       }
       else
@@ -321,6 +324,26 @@ AscentRuntime::Initialize(const conduit::Node &options)
       }
     }
 
+    if(options.has_path("ghost_field_names"))
+    {
+      if(!options["ghost_field_names"].dtype().is_list())
+      {
+        ASCENT_ERROR("ghost_field_names is not a list");
+      }
+
+      m_ghost_fields.reset();
+      const int num_children = options["ghost_field_names"].number_of_children();
+      for(int i = 0; i < num_children; ++i)
+      {
+        const conduit::Node &child = options["ghost_field_names"].child(i);
+        if(!child.dtype().is_string())
+        {
+          ASCENT_ERROR("ghost_field_names list child " << i << " is not a string");
+        }
+        m_ghost_fields.append().set(child);
+      }
+    }
+
     // standard flow filters
     flow::filters::register_builtin();
     // filters for ascent flow runtime.
@@ -377,12 +400,20 @@ AscentRuntime::Info(conduit::Node &out)
     out.set(m_info);
 }
 
+//-----------------------------------------------------------------------------
+conduit::Node &
+AscentRuntime::Info()
+{
+    return m_info;
+}
+
 //-----------------------------------------------------------------------------
 void
 AscentRuntime::ResetInfo()
 {
     m_info.reset();
     m_info["runtime/type"] = "ascent";
+    m_info["runtime/options"] = m_runtime_options;
     m_info["registered_filter_types"] = registered_filter_types();
 }
 
@@ -401,7 +432,7 @@ AscentRuntime::AddPublishedMeshInfo()
 #ifdef ASCENT_MPI_ENABLED
     int comm_id = flow::Workspace::default_mpi_comm();
     MPI_Comm mpi_comm = MPI_Comm_f2c(comm_id);
-  
+
     Node n_src, n_reduce;
     n_src = src_tbytes;
     // all reduce to get total number of bytes across mpi tasks
@@ -469,7 +500,7 @@ AscentRuntime::Cleanup()
         std::string file_name = fname.str();
         file_name = conduit::utils::join_file_path(m_default_output_dir,file_name);
         ftimings.open(file_name, std::ofstream::out | std::ofstream::app);
-        ftimings << w.timing_info();
+        ftimings << m_workspace.timing_info();
         ftimings.close();
     }
 }
@@ -478,33 +509,6 @@ AscentRuntime::Cleanup()
 void
 AscentRuntime::Publish(const conduit::Node &data)
 {
-    // Process the comments.
-    m_comments.reset();
-    if(data.has_path("state/software"))
-    {
-      m_comments.append() = "Software";
-      m_comments.append() = data["state/software"].as_string();
-    }
-    if(data.has_path("state/source"))
-    {
-      m_comments.append() = "Source";
-      m_comments.append() = data["state/source"].as_string();
-    }
-    if(data.has_path("state/title"))
-    {
-      m_comments.append() = "Title";
-      m_comments.append() = data["state/title"].as_string();
-    }
-    if(data.has_path("state/info"))
-    {
-      m_comments.append() = "Description";
-      m_comments.append() = data["state/info"].as_string();
-    }
-    if(data.has_path("state/comment"))
-    {
-      m_comments.append() = "Comment";
-      m_comments.append() = data["state/comment"].as_string();
-    }
 
     blueprint::mesh::to_multi_domain(data, m_source);
     EnsureDomainIds();
@@ -521,6 +525,22 @@ AscentRuntime::Publish(const conduit::Node &data)
 void
 AscentRuntime::EnsureDomainIds()
 {
+    //add debug timing file in case these checks
+    //add a lot of overhead
+#define _DEBUG 0
+
+#if _DEBUG
+      std::stringstream log_name;
+      std::string log_prefix = "EnsureDomainIDs_times_";
+#ifdef ASCENT_MPI_ENABLED
+      log_name << log_prefix << m_rank<<".csv";
+#else
+      log_name << log_prefix << "0.csv";
+#endif
+      std::ofstream stream;
+      stream.open(log_name.str().c_str(),std::ofstream::app);
+      conduit::utils::Timer ensureDomainIDsTimer;
+#endif
     // if no domain ids were provided add them now
     int num_domains = 0;
     bool has_ids = true;
@@ -541,7 +561,6 @@ AscentRuntime::EnsureDomainIds()
       }
     }
 
-
 #ifdef ASCENT_MPI_ENABLED
     int comm_id = flow::Workspace::default_mpi_comm();
 
@@ -584,6 +603,11 @@ AscentRuntime::EnsureDomainIds()
     }
 
     int domain_offset = 0;
+
+#if _DEBUG
+    conduit::utils::Timer local_check_timer;
+#endif
+
 #ifdef ASCENT_MPI_ENABLED
     int *domains_per_rank = new int[comm_size];
     MPI_Allgather(&num_domains, 1, MPI_INT, domains_per_rank, 1, MPI_INT, mpi_comm);
@@ -591,17 +615,139 @@ AscentRuntime::EnsureDomainIds()
     {
       domain_offset += domains_per_rank[i];
     }
+    int total_domains = 0;
+    for(int i = 0; i < comm_size; i++)
+    {
+      total_domains += domains_per_rank[i];
+    }
     delete[] domains_per_rank;
 #endif
+
+    std::unordered_set local_unique_ids;
     for(int i = 0; i < num_domains; ++i)
     {
       conduit::Node &dom = m_source.child(i);
 
       if(!dom.has_path("state/domain_id"))
       {
-         dom["state/domain_id"] = domain_offset + i;
+        dom["state/domain_id"] = domain_offset + i;
+        local_unique_ids.insert(domain_offset + i);
+      }
+      else
+      {
+        local_unique_ids.insert(dom["state/domain_id"].to_int32());
+      }
+    }
+
+    int unique_ids = 1;
+    if(local_unique_ids.size() != num_domains)
+    {
+      unique_ids = 0;
+    }
+#ifdef ASCENT_MPI_ENABLED
+    conduit::Node n_ids;
+    n_ids.set(DataType::c_int(comm_size));
+    int *unique_ids_array = n_ids.value();//new int[comm_size];
+    MPI_Allgather(&unique_ids, 1, MPI_INT, unique_ids_array, 1, MPI_INT, mpi_comm);
+    std::stringstream ss;
+    for(int i = 0; i < comm_size; i++)
+    {
+      if(unique_ids_array[i] == 0)
+      {
+	unique_ids = 0;
+	ss << i << " ";
+      } 
+    }
+
+    if(!unique_ids)
+      ASCENT_ERROR("Local Domain IDs are not unique on ranks: " << ss.str());
+#else
+    if(!unique_ids)
+      ASCENT_ERROR("Local Domain IDs are not unique ");
+#endif
+#if _DEBUG
+    float local_check_timer_time = local_check_timer.elapsed();
+    std::stringstream local_check_timer_log;
+    local_check_timer_log << "Local Uniqueness Check: " << local_check_timer_time << "\n";
+    stream << local_check_timer_log.str();
+#endif
+
+
+#ifdef ASCENT_MPI_ENABLED
+
+#if _DEBUG
+    conduit::utils::Timer global_check_timer;
+#endif
+    conduit::Node n_dom_ids;
+    conduit::Node n_global_dom_ids;
+    conduit::Node n_dom_rank;
+    conduit::Node n_global_dom_rank;
+    n_dom_ids.set(DataType::c_int(total_domains));
+    n_global_dom_ids.set(DataType::c_int(total_domains));
+    n_dom_rank.set(DataType::c_int(total_domains));
+    n_global_dom_rank.set(DataType::c_int(total_domains));
+    int *domain_ids_per_rank = n_dom_ids.value();
+    int *global_domain_ids = n_global_dom_ids.value();
+    int *domain_rank = n_dom_rank.value();
+    int *global_domain_rank = n_global_dom_rank.value();
+
+    for(int i = 0; i < total_domains; i++)
+    {
+      domain_ids_per_rank[i] = -1;
+      domain_rank[i] = -1;
+    }
+    for(int i = 0; i < num_domains; ++i)
+    {
+      conduit::Node &dom = m_source.child(i);
+      domain_ids_per_rank[domain_offset + i] = dom["state/domain_id"].to_int32();
+      domain_rank[domain_offset + i] = m_rank;
+    }
+
+    MPI_Allreduce(domain_ids_per_rank, global_domain_ids, total_domains, MPI_INT, MPI_MAX,  mpi_comm);
+    MPI_Allreduce(domain_rank, global_domain_rank, total_domains, MPI_INT, MPI_MAX,  mpi_comm);
+
+    std::unordered_set global_ids;
+    for(int i = 0; i < total_domains; i++)
+    {
+      global_ids.insert(global_domain_ids[i]);
+    }
+
+    if(global_ids.size() != total_domains)
+    {
+      std::map> map_global_ids;
+      for(int i = 0; i < total_domains; i++)
+      {
+        map_global_ids[global_domain_ids[i]].push_back(global_domain_rank[i]);
+      }
+      for(auto itr = map_global_ids.begin(); itr != map_global_ids.end(); ++itr)
+      {
+        if(itr->second.size() > 1)
+	{
+	  ss << "domain: " << itr->first << " on ranks: ";
+	  for(auto iitr = itr->second.begin(); iitr != itr->second.end(); ++iitr)
+	  {
+            ss << *iitr << " ";
+	  }
+	  ss << "\n";
+	}
       }
+      ASCENT_ERROR("Global Domain IDs are not unique for " << ss.str());
     }
+#if _DEBUG
+    float global_check_timer_time = global_check_timer.elapsed();
+    std::stringstream global_check_timer_log;
+    global_check_timer_log << "Global Uniqueness Check: " << global_check_timer_time << "\n";
+    stream << global_check_timer_log.str();
+#endif
+#endif
+
+#if _DEBUG
+    float ensureDomainIDs_time = ensureDomainIDsTimer.elapsed();
+    std::stringstream ensureDomainIDs_log;
+    ensureDomainIDs_log << "AscentRuntime::EnsureDomainIDs [TOTAL]: " << ensureDomainIDs_time << "\n";
+    stream << ensureDomainIDs_log.str();
+    stream.close();
+#endif
 }
 
 //-----------------------------------------------------------------------------
@@ -615,7 +761,7 @@ AscentRuntime::CreateDefaultFilters()
     endpoints["filters"] = endpoint;
     endpoints["queries"] = queries_endpoint;
 
-    if(w.graph().has_filter(endpoint))
+    if(m_workspace.graph().has_filter(endpoint))
     {
       return endpoints;
     }
@@ -627,13 +773,13 @@ AscentRuntime::CreateDefaultFilters()
     //
     conduit::Node params;
     params["protocol"] = "mesh";
-    w.graph().add_filter("blueprint_verify", // registered filter name
-                         "verify",           // "unique" filter name
-                         params);
+    m_workspace.graph().add_filter("blueprint_verify", // registered filter name
+                                   "verify",           // "unique" filter name
+                                   params);
 
-    w.graph().connect("source",
-                      "verify",
-                      0);        // default port
+    m_workspace.graph().connect("source",
+                                "verify",
+                                0);        // default port
 
     std::string prev_filter = "verify";
 
@@ -662,13 +808,13 @@ AscentRuntime::CreateDefaultFilters()
       threshold_params["min_value"] = 0;
       threshold_params["max_value"] = 1;
 
-      w.graph().add_filter("vtkh_ghost_stripper",
-                           filter_name,
-                           threshold_params);
+      m_workspace.graph().add_filter("vtkh_ghost_stripper",
+                                     filter_name,
+                                     threshold_params);
 
-      w.graph().connect(prev_filter,
-                        filter_name,
-                        0);        // default port
+      m_workspace.graph().connect(prev_filter,
+                                  filter_name,
+                                  0);        // default port
 
       prev_filter = filter_name;
     }
@@ -678,19 +824,19 @@ AscentRuntime::CreateDefaultFilters()
     // order of execution. Pipelines using expressions might
     // need the results of a query, so make them execute first
     // create an alias passthrough
-    w.graph().add_filter("alias",
-                         queries_endpoint);
+    m_workspace.graph().add_filter("alias",
+                                   queries_endpoint);
 
-    w.graph().connect(prev_filter,      // src
-                      queries_endpoint, // dest
-                      0);               // default port
+    m_workspace.graph().connect(prev_filter,      // src
+                                queries_endpoint, // dest
+                                0);               // default port
 
-    w.graph().add_filter("dependent_alias",
-                         endpoint);
+    m_workspace.graph().add_filter("dependent_alias",
+                                    endpoint);
 
-    w.graph().connect(queries_endpoint, // src
-                      endpoint,         // dest
-                      0);               // default port
+    m_workspace.graph().connect(queries_endpoint, // src
+                                endpoint,         // dest
+                                0);               // default port
 
     return endpoints;
 }
@@ -767,9 +913,9 @@ AscentRuntime::ConvertPipelineToFlow(const conduit::Node &pipeline,
       std::stringstream ss;
       ss< names = commands.child_names();
+  for(int i = 0; i < commands.number_of_children(); ++i)
+  {
+    conduit::Node command = commands.child(i);
+    ConvertCommandToFlow(command, names[i]);
+  }
+}
+
 //-----------------------------------------------------------------------------
 void
 AscentRuntime::PopulateMetadata()
@@ -1214,10 +1399,35 @@ AscentRuntime::PopulateMetadata()
   const int num_domains = m_source.number_of_children();
   int cycle = -1;
   float time = -1.f;
+  bool metadata_set = false;
 
   for(int i = 0; i < num_domains; ++i)
   {
     const conduit::Node &dom = m_source.child(i);
+    if (!metadata_set && dom.has_path("state"))
+    {
+      m_comments.reset();
+      conduit::NodeConstIterator itr = dom["state"].children();
+
+      while(itr.has_next())
+      {
+        const conduit::Node &cld = itr.next();
+        if(cld.has_path("keyword") && cld.has_path("data"))
+        {
+          metadata_set = true;
+          m_comments.append() = cld["keyword"].as_string();
+          try
+          {
+            m_comments.append() = cld["data"].as_string();
+          }
+          catch(const conduit::Error)
+          {
+            m_comments.append() = cld["data"].to_string();
+          }
+        }
+      }
+    }
+
     if(dom.has_path("state/cycle"))
     {
       cycle = dom["state/cycle"].to_int32();
@@ -1228,7 +1438,6 @@ AscentRuntime::PopulateMetadata()
     }
   }
 
-
   if(cycle != -1)
   {
     Metadata::n_metadata["cycle"] = cycle;
@@ -1261,17 +1470,17 @@ AscentRuntime::ConnectSource()
     // the set_external updates everything,
     // we don't need to remove and re-add.
 
-    if(!w.registry().has_entry("_ascent_input_data"))
+    if(!m_workspace.registry().has_entry("_ascent_input_data"))
     {
-        w.registry().add("_ascent_input_data",
+        m_workspace.registry().add("_ascent_input_data",
                                      &m_data_object);
     }
 
-    if(!w.graph().has_filter("source"))
+    if(!m_workspace.graph().has_filter("source"))
     {
        Node p;
        p["entry"] = "_ascent_input_data";
-       w.graph().add_filter("registry_source","source",p);
+       m_workspace.graph().add_filter("registry_source","source",p);
     }
 }
 
@@ -1302,22 +1511,22 @@ AscentRuntime::ConnectGraphs()
     {
       pipeline = CreateDefaultFilters()["filters"].as_string();
     }
-    else if(!w.graph().has_filter(pipeline))
+    else if(!m_workspace.graph().has_filter(pipeline))
     {
       ASCENT_ERROR(names[i]<<"' references unknown pipeline: "< 0)
       {
         std::string union_bounds_name = plot_names[p] + "_union_bounds";
-        w.graph().add_filter("vtkh_union_bounds",
-                              union_bounds_name,
-                              empty);
+        m_workspace.graph().add_filter("vtkh_union_bounds",
+                                       union_bounds_name,
+                                       empty);
         union_bounds_names.push_back(union_bounds_name);
 
         if(p == 1)
         {
           // first union just needs the output
           // of the first bounds
-          w.graph().connect(bounds_names[p-1],  // src
-                            union_bounds_name,  // dest
-                            0);                 // default port
+          m_workspace.graph().connect(bounds_names[p-1],  // src
+                                      union_bounds_name,  // dest
+                                      0);                 // default port
         }
         else
         {
@@ -1512,22 +1721,22 @@ AscentRuntime::CreateScenes(const conduit::Node &scenes)
           // the current plot and the output of the
           // previous union
           //
-          w.graph().connect(union_bounds_names[p-2],  // src
-                            union_bounds_name,        // dest
-                            0);                       // default port
+          m_workspace.graph().connect(union_bounds_names[p-2],  // src
+                                      union_bounds_name,        // dest
+                                      0);                       // default port
 
         }
 
-        w.graph().connect(bounds_name,        // src
-                          union_bounds_name,  // dest
-                          1);                 // default port
+        m_workspace.graph().connect(bounds_name,        // src
+                                    union_bounds_name,  // dest
+                                    1);                 // default port
 
       }
 
       // connect the plot with the scene
       std::string add_name = "add_plot_" + plot_names[p];
-      w.graph().add_filter("add_plot",
-                            add_name);
+      m_workspace.graph().add_filter("add_plot",
+                                     add_name);
 
       std::string src_scene = prev_add_plot_name;
 
@@ -1538,14 +1747,14 @@ AscentRuntime::CreateScenes(const conduit::Node &scenes)
       prev_add_plot_name = add_name;
 
       // connect the plot to add_plot
-      w.graph().connect(plot_names[p], // src
-                        add_name,      // dest
-                        1);            // plot port
+      m_workspace.graph().connect(plot_names[p], // src
+                                  add_name,      // dest
+                                  1);            // plot port
 
       // connect the scene to add_plot
-      w.graph().connect(src_scene,     // src
-                        add_name,      // dest
-                        0);            // scene port
+      m_workspace.graph().connect(src_scene,     // src
+                                  add_name,      // dest
+                                  0);            // scene port
 
     }
 
@@ -1565,19 +1774,19 @@ AscentRuntime::CreateScenes(const conduit::Node &scenes)
       bounds_output = union_bounds_names[union_size-1];
     }
 
-    w.graph().connect(bounds_output, // src
-                      renders_name,  // dest
-                      0);            // default port
+    m_workspace.graph().connect(bounds_output, // src
+                                renders_name,  // dest
+                                0);            // default port
 
     // connect Exec Scene to the output of the last
     // add_plot and to the renders
-    w.graph().connect(prev_add_plot_name, // src
-                      exec_name,          // dest
-                      0);                 // default port
+    m_workspace.graph().connect(prev_add_plot_name, // src
+                                exec_name,          // dest
+                                0);                 // default port
 
-    w.graph().connect(renders_name,       // src
-                      exec_name,          // dest
-                      1);                 // default port
+    m_workspace.graph().connect(renders_name,       // src
+                                exec_name,          // dest
+                                1);                 // default port
   } // each scene
 }
 
@@ -1588,12 +1797,12 @@ AscentRuntime::FindRenders(conduit::Node &image_params,
 {
     image_list.reset();
 
-    if(!w.registry().has_entry("image_list"))
+    if(!m_workspace.registry().has_entry("image_list"))
     {
       return;
     }
 
-    Node *images = w.registry().fetch("image_list");
+    Node *images = m_workspace.registry().fetch("image_list");
 
     const int size = images->number_of_children();
     image_params = *images;
@@ -1618,6 +1827,7 @@ AscentRuntime::BuildGraph(const conduit::Node &actions)
   m_save_info_actions.reset();
 
   // execution will be enforced in the following order:
+  conduit::Node commands;
   conduit::Node queries;
   conduit::Node triggers;
   conduit::Node pipelines;
@@ -1689,6 +1899,17 @@ AscentRuntime::BuildGraph(const conduit::Node &actions)
           ASCENT_ERROR("action 'add_queries' missing child 'queries'");
         }
       }
+      else if(action_name == "add_commands")
+      {
+        if(action.has_path("commands"))
+        {
+          commands.append() = action["commands"];
+        }
+        else
+        {
+          ASCENT_ERROR("action 'add_commands' missing child 'commands'");
+        }
+      }
       else if( action_name == "execute" ||
                action_name == "reset")
       {
@@ -1719,6 +1940,10 @@ AscentRuntime::BuildGraph(const conduit::Node &actions)
   {
     CreatePipelines(pipelines.child(i));
   }
+  for(int i = 0; i < commands.number_of_children(); ++i)
+  {
+    CreateCommands(commands.child(i));
+  }
   for(int i = 0; i < queries.number_of_children(); ++i)
   {
     CreateQueries(queries.child(i));
@@ -1749,7 +1974,7 @@ AscentRuntime::Execute(const conduit::Node &actions)
       log_timings = true;
     }
 
-    w.enable_timings(log_timings);
+    m_workspace.enable_timings(log_timings);
 
     // catch any errors that come up here and forward
     // them up as a conduit error
@@ -1790,7 +2015,7 @@ AscentRuntime::Execute(const conduit::Node &actions)
           }
 
           // destroy existing graph an start anew
-          w.reset();
+          m_workspace.reset();
           ConnectSource();
           BuildGraph(actions);
         }
@@ -1807,11 +2032,11 @@ AscentRuntime::Execute(const conduit::Node &actions)
 
         // add the source to the registry so we can access information
         // about the original mesh (like bounds)
-        w.registry().add("source_object", &m_data_object,1);
+        m_workspace.registry().add("source_object", &m_data_object,1);
 
-        w.info(m_info["flow_graph"]);
+        m_workspace.info(m_info["flow_graph"]);
         m_info["actions"] = actions;
-        // w.graph().save_dot_html("ascent_flow_graph.html");
+        // m_workspace.graph().save_dot_html("ascent_flow_graph.html");
 
 #if defined(ASCENT_VTKM_ENABLED)
         if(log_timings)
@@ -1828,7 +2053,7 @@ AscentRuntime::Execute(const conduit::Node &actions)
         }
 #endif
         // now execute the data flow graph
-        w.execute();
+        m_workspace.execute();
 
 #if defined(ASCENT_VTKM_ENABLED)
         if(log_timings)
@@ -1852,15 +2077,14 @@ AscentRuntime::Execute(const conduit::Node &actions)
         }
 
         // add extract results to info
-        if(w.registry().has_entry("extract_list"))
+        if(m_workspace.registry().has_entry("extract_list"))
         {
-            Node *extracts_list = w.registry().fetch("extract_list");
+            Node *extracts_list = m_workspace.registry().fetch("extract_list");
             if(extracts_list->number_of_children() > 0)
             {
-                m_info["extracts"].set(*extracts_list);
+                // info assumes all data from extract list
+                m_info["extracts"].move(*extracts_list);
             }
-            // always clear after fetch.
-            extracts_list->reset();
         }
 
         // add expression results to info
@@ -1873,8 +2097,8 @@ AscentRuntime::Execute(const conduit::Node &actions)
         }
 
         // add flow graphviz details to info
-        m_info["flow_graph_dot"]      = w.graph().to_dot();
-        m_info["flow_graph_dot_html"] = w.graph().to_dot_html();
+        m_info["flow_graph_dot"]      = m_workspace.graph().to_dot();
+        m_info["flow_graph_dot_html"] = m_workspace.graph().to_dot_html();
 
         m_web_interface.PushRenders(render_file_names);
 
@@ -1883,14 +2107,14 @@ AscentRuntime::Execute(const conduit::Node &actions)
         ascent::about(msg["about"]);
         m_web_interface.PushMessage(msg);
 
-        w.registry().reset();
+        m_workspace.registry().reset();
 
         SetStatus("Ascent::execute completed");
         if(m_save_info_actions.number_of_children() > 0)
         {
           SaveInfo();
         }
-        
+
     }
     // --- close try --- //
 
@@ -1900,28 +2124,28 @@ AscentRuntime::Execute(const conduit::Node &actions)
     // bottle vtkm and vtkh errors
     catch(vtkh::Error &e)
     {
-      w.reset();
+      m_workspace.reset();
       ASCENT_ERROR("Execution failed with vtkh: "< GetPipelines(const conduit::Node &plots);
     void CreateScenes(const conduit::Node &scenes);
diff --git a/src/libs/ascent/runtimes/ascent_vtkh_data_adapter.cpp b/src/libs/ascent/runtimes/ascent_vtkh_data_adapter.cpp
index d7ded7b8c..9cee660c5 100644
--- a/src/libs/ascent/runtimes/ascent_vtkh_data_adapter.cpp
+++ b/src/libs/ascent/runtimes/ascent_vtkh_data_adapter.cpp
@@ -684,6 +684,16 @@ VTKHDataAdapter::BlueprintToVTKmDataSet(const Node &node,
                                                    nverts,
                                                    zero_copy);
     }
+    else if( mesh_type ==  "points")
+    {
+        result =  PointsImplicitBlueprintToVTKmDataSet(coords_name,
+                                                       n_coords,
+                                                       topo_name,
+                                                       n_topo,
+                                                       neles,
+                                                       nverts,
+                                                       zero_copy);
+    }
     else if( mesh_type ==  "unstructured")
     {
         result =  UnstructuredBlueprintToVTKmDataSet(coords_name,
@@ -1186,6 +1196,62 @@ VTKHDataAdapter::StructuredBlueprintToVTKmDataSet
     return result;
 }
 
+//-----------------------------------------------------------------------------
+
+vtkm::cont::DataSet *
+VTKHDataAdapter::PointsImplicitBlueprintToVTKmDataSet
+    (const std::string &coords_name, // input string with coordset name
+     const Node &n_coords,           // input mesh bp coordset (assumed unstructured)
+     const std::string &topo_name,   // input string with topo name
+     const Node &n_topo,             // input mesh bp topo
+     int &neles,                     // output, number of eles  (will be the same as nverts)
+     int &nverts,                    // output, number of verts (will be the same as neles)
+     bool zero_copy)                 // attempt to zero copy
+{
+    vtkm::cont::DataSet *result = new vtkm::cont::DataSet();
+
+    nverts = n_coords["values/x"].dtype().number_of_elements();
+
+    int32 ndims;
+    vtkm::cont::CoordinateSystem coords;
+    if(n_coords["values/x"].dtype().is_float64())
+    {
+      coords = detail::GetExplicitCoordinateSystem(n_coords,
+                                                            coords_name,
+                                                            ndims,
+                                                            zero_copy);
+    }
+    else if(n_coords["values/x"].dtype().is_float32())
+    {
+      coords = detail::GetExplicitCoordinateSystem(n_coords,
+                                                            coords_name,
+                                                            ndims,
+                                                            zero_copy);
+    }
+    else
+    {
+      ASCENT_ERROR("Coordinate system must be floating point values");
+    }
+
+    result->AddCoordinateSystem(coords);
+
+    vtkm::UInt8 shape_id = 1;
+    vtkm::IdComponent indices_per = 1;
+    vtkm::cont::CellSetSingleType<> cellset;
+    // alloc conn to nverts, fill with 0 --> nverts-1)
+    vtkm::cont::ArrayHandle connectivity;
+    connectivity.Allocate(nverts);
+    auto conn_portal = connectivity.WritePortal();
+    for(int i = 0; i < nverts; ++i)
+    {
+        conn_portal.Set(i, i);
+    }
+    cellset.Fill(nverts, shape_id, indices_per, connectivity);
+    neles = cellset.GetNumberOfCells();
+    result->SetCellSet(cellset);
+    return result;
+}
+
 
 
 //-----------------------------------------------------------------------------
diff --git a/src/libs/ascent/runtimes/ascent_vtkh_data_adapter.hpp b/src/libs/ascent/runtimes/ascent_vtkh_data_adapter.hpp
index 003fdb7f2..ca15124b4 100644
--- a/src/libs/ascent/runtimes/ascent_vtkh_data_adapter.hpp
+++ b/src/libs/ascent/runtimes/ascent_vtkh_data_adapter.hpp
@@ -123,6 +123,14 @@ class ASCENT_API VTKHDataAdapter
                                                                   int &nverts,
                                                                   bool zero_copy);
 
+     static vtkm::cont::DataSet *PointsImplicitBlueprintToVTKmDataSet(const std::string &coords_name,
+                                                                      const conduit::Node &n_coords,
+                                                                      const std::string &topo_name,
+                                                                      const conduit::Node &n_topo,
+                                                                      int &neles,
+                                                                      int &nverts,
+                                                                      bool zero_copy);
+
      static vtkm::cont::DataSet *UnstructuredBlueprintToVTKmDataSet(const std::string &coords_name,
                                                                     const conduit::Node &n_coords,
                                                                     const std::string &topo_name,
diff --git a/src/libs/ascent/runtimes/expressions/ascent_array_utils.cpp b/src/libs/ascent/runtimes/expressions/ascent_array_utils.cpp
index 69845ef37..ee2547c3b 100644
--- a/src/libs/ascent/runtimes/expressions/ascent_array_utils.cpp
+++ b/src/libs/ascent/runtimes/expressions/ascent_array_utils.cpp
@@ -1,6 +1,6 @@
 #include 
 #include 
-#include 
+#include 
 
 #if defined(ASCENT_RAJA_ENABLED)
 #include 
diff --git a/src/libs/ascent/runtimes/expressions/ascent_blueprint_architect.cpp b/src/libs/ascent/runtimes/expressions/ascent_blueprint_architect.cpp
index fa4f31a3c..6c72a2b9e 100644
--- a/src/libs/ascent/runtimes/expressions/ascent_blueprint_architect.cpp
+++ b/src/libs/ascent/runtimes/expressions/ascent_blueprint_architect.cpp
@@ -13,10 +13,10 @@
 #include "ascent_blueprint_architect.hpp"
 #include "ascent_array.hpp"
 #include "ascent_array_utils.hpp"
-#include "ascent_dispatch.hpp"
-#include "ascent_memory_interface.hpp"
+#include "ascent_blueprint_device_dispatch.hpp"
+#include "ascent_blueprint_device_mesh_objects.hpp"
 #include "ascent_execution_manager.hpp"
-#include "ascent_conduit_reductions.hpp"
+#include "ascent_blueprint_device_reductions.hpp"
 
 #include 
 
@@ -197,7 +197,7 @@ get_element_indices(const conduit::Node &n_topo,
     // this is an array that could be on the GPU, so we have to
     // use special care
     const conduit::Node &n_topo_conn = n_topo_eles["connectivity"];
-    MemoryInterface conn(n_topo_eles, "connectivity");
+    MCArray conn(n_topo_eles["connectivity"]);
     const int offset = index * num_indices;
     for(int i = 0; i < num_indices; ++i)
     {
@@ -288,22 +288,22 @@ get_explicit_vert(const conduit::Node &n_coords, const int &index)
   double vert[3] = {0., 0., 0.};
   if(is_float64)
   {
-    MemoryInterface array(n_coords);
-    vert[0] = array.value(index,"x");
-    vert[1] = array.value(index,"y");
-    if(array.components() == 3)
+    MCArray coords_vals(n_coords["values"]);
+    vert[0] = coords_vals.value(index,"x");
+    vert[1] = coords_vals.value(index,"y");
+    if(coords_vals.components() == 3)
     {
-      vert[2] = array.value(index,"z");
+      vert[2] = coords_vals.value(index,"z");
     }
   }
   else
   {
-    MemoryInterface array(n_coords);
-    vert[0] = array.value(index,"x");
-    vert[1] = array.value(index,"y");
-    if(array.components() == 3)
+    MCArray coords_vals(n_coords["values"]);
+    vert[0] = coords_vals.value(index,"x");
+    vert[1] = coords_vals.value(index,"y");
+    if(coords_vals.components() == 3)
     {
-      vert[2] = array.value(index,"z");
+      vert[2] = coords_vals.value(index,"z");
     }
   }
 
@@ -345,7 +345,7 @@ get_rectilinear_vert(const conduit::Node &n_coords, const int &index)
 
   if(is_float64)
   {
-    MemoryInterface f_coords(n_coords);
+    MCArray f_coords(n_coords["values"]);
     vert[0] = f_coords.value(logical_index[0],"x");
     vert[1] = f_coords.value(logical_index[1],"y");
     if(dims[2] != 0)
@@ -355,7 +355,7 @@ get_rectilinear_vert(const conduit::Node &n_coords, const int &index)
   }
   else
   {
-    MemoryInterface f_coords(n_coords);
+    MCArray f_coords(n_coords["values"]);
     vert[0] = f_coords.value(logical_index[0],"x");
     vert[1] = f_coords.value(logical_index[1],"y");
     if(dims[2] != 0)
@@ -1035,6 +1035,8 @@ global_bounds(const conduit::Node &dataset, const std::string &topo_name)
       int num_dims = n_coords["values"].number_of_children();
       for(int i = 0; i < num_dims; ++i)
       {
+          // note: these aren't really fields, but the are close enough
+          // to be exec-ed this way
         const std::string axis_path = "values/" + axes[i][0];
         min_coords[i] = std::min(
             min_coords[i], field_reduction_min(n_coords, axes[i][0])["value"].as_double());
@@ -1232,7 +1234,7 @@ int find_bin(const T* bins, const int size, const T val, bool clamp)
 }
 
 // returns -1 if value lies outside the range
-int
+conduit::index_t
 get_bin_index(const conduit::float64 value, const conduit::Node &axis)
 {
   const bool clamp = axis["clamp"].to_uint8();
@@ -1248,8 +1250,8 @@ get_bin_index(const conduit::float64 value, const conduit::Node &axis)
       axis["num_bins"].to_float64() /
       (axis["max_val"].to_float64() - axis["min_val"].to_float64());
 
-  const int bin_index =
-      static_cast((value - axis["min_val"].to_float64()) * inv_delta);
+  const conduit::index_t bin_index =
+      static_cast((value - axis["min_val"].to_float64()) * inv_delta);
 
   if(clamp)
   {
@@ -1257,12 +1259,12 @@ get_bin_index(const conduit::float64 value, const conduit::Node &axis)
     {
       return 0;
     }
-    else if(bin_index >= axis["num_bins"].as_int32())
+    else if(bin_index >= axis["num_bins"].to_index_t())
     {
-      return axis["num_bins"].as_int32() - 1;
+      return axis["num_bins"].to_index_t() - 1;
     }
   }
-  else if(bin_index < 0 || bin_index >= axis["num_bins"].as_int32())
+  else if(bin_index < 0 || bin_index >= axis["num_bins"].to_index_t())
   {
     return -1;
   }
@@ -1394,7 +1396,7 @@ populate_homes(const conduit::Node &dom,
     if(bin_axes.child(axis_index).has_path("num_bins"))
     {
       // uniform axis
-      stride *= bin_axes.child(axis_index)["num_bins"].as_int32();
+      stride *= bin_axes.child(axis_index)["num_bins"].to_index_t();
     }
     else
     {
@@ -1538,7 +1540,7 @@ binning(const conduit::Node &dataset,
   int num_axes = bin_axes.number_of_children();
 
   // create bins
-  size_t num_bins = 1;
+  index_t num_bins = 1;
   for(int axis_index = 0; axis_index < num_axes; ++axis_index)
   {
     conduit::Node &axis = bin_axes.child(axis_index);
@@ -1546,18 +1548,18 @@ binning(const conduit::Node &dataset,
 
     if(!bin_axes.child(axis_index).has_child("min_val"))
     {
-      axis["min_val"] = field_min(dataset, axis_name)["value"].as_float64();
+      axis["min_val"] = field_min(dataset, axis_name)["value"].to_float64();
     }
     if(!axis.has_child("max_val"))
     {
       // TODO: FIXME THE BASELINES REQUIRE +1 here, not good.
-      axis["max_val"] = field_max(dataset, axis_name)["value"].as_float64() + 1.0;
+      axis["max_val"] = field_max(dataset, axis_name)["value"].to_float64() + 1.0;
     }
 
     if(bin_axes.child(axis_index).has_path("num_bins"))
     {
       // uniform axis
-      num_bins *= bin_axes.child(axis_index)["num_bins"].as_int32();
+      num_bins *= bin_axes.child(axis_index)["num_bins"].to_index_t();
     }
     else
     {
@@ -1984,7 +1986,7 @@ binning_mesh(const conduit::Node &binning,
     else
     {
       // uniform
-      const int dim = axis["num_bins"].as_int32() + 1;
+      const conduit::index_t dim = axis["num_bins"].to_index_t() + 1;
       const double delta =
           (axis["max_val"].to_float64() - axis["min_val"].to_float64()) /
           (dim - 1);
@@ -2494,17 +2496,17 @@ void paint_nestsets(const std::string nestset_name,
     ASCENT_ERROR("Paint nestsets: cannot paint on unstructured topology");
   }
 
-  int el_dims[3] = {1,1,1};
+  conduit::index_t el_dims[3] = {1,1,1};
   bool is_3d = false;
 
   if(topo["type"].as_string() == "structured")
   {
-    el_dims[0] = topo["elements/dims/i"].to_int32();
-    el_dims[1] = topo["elements/dims/j"].to_int32();
+    el_dims[0] = topo["elements/dims/i"].to_index_t();
+    el_dims[1] = topo["elements/dims/j"].to_index_t();
     if(topo.has_path("elements/dims/k"))
     {
       is_3d = true;
-      el_dims[2] = topo["elements/dims/k"].to_int32();
+      el_dims[2] = topo["elements/dims/k"].to_index_t();
     }
 
   }
@@ -2514,13 +2516,13 @@ void paint_nestsets(const std::string nestset_name,
     const conduit::Node &coords = dom["coordsets/"+coord_name];
     if(coords["type"].as_string() == "uniform")
     {
-      el_dims[0] = coords["dims/i"].as_int32() - 1;
-      el_dims[1] = coords["dims/j"].as_int32() - 1;
+      el_dims[0] = coords["dims/i"].to_index_t() - 1;
+      el_dims[1] = coords["dims/j"].to_index_t() - 1;
 
       if(coords.has_path("dims/k"))
       {
         is_3d = true;
-        el_dims[2] = coords["dims/k"].to_int32() -1;
+        el_dims[2] = coords["dims/k"].to_index_t() -1;
       }
     }
     else if(coords["type"].as_string() == "rectilinear")
@@ -2539,13 +2541,13 @@ void paint_nestsets(const std::string nestset_name,
     }
   }
 
-  conduit::int32 field_size = el_dims[0] * el_dims[1];
+  conduit::index_t field_size = el_dims[0] * el_dims[1];
   if(is_3d)
   {
     field_size *= el_dims[2];
   }
 
-  conduit::int32_array levels;
+  conduit::index_t_array levels;
   // check to see if the field already has data or if
   // we need to create a new field
   if(field.has_path("values"))
@@ -2562,7 +2564,7 @@ void paint_nestsets(const std::string nestset_name,
   {
     field["association"] = "element";
     field["topology"] = topo_name;
-    field["values"] = conduit::DataType::int32(field_size);
+    field["values"] = conduit::DataType::index_t(field_size);
     levels = field["values"].value();
     for(int i = 0; i < field_size; ++i)
     {
@@ -2575,8 +2577,8 @@ void paint_nestsets(const std::string nestset_name,
   // across all domains
   if(!dom.has_path("nestsets/"+nestset_name))
   {
-    // we alrady init'd it to zero if its a new field, so we are good to go
-    // if it wasnt' a new field, it should already have the correct values
+    // we already init'd it to zero if its a new field, so we are good to go
+    // if it wasn't' a new field, it should already have the correct values
     return;
   }
 
@@ -2593,36 +2595,36 @@ void paint_nestsets(const std::string nestset_name,
       continue;
     }
 
-    int origin[3];
-    origin[0] = window["origin/i"].to_int32();
-    origin[1] = window["origin/j"].to_int32();
+    conduit::index_t origin[3];
+    origin[0] = window["origin/i"].to_index_t();
+    origin[1] = window["origin/j"].to_index_t();
 
     if(is_3d)
     {
-      origin[2] = window["origin/k"].to_int32();
+      origin[2] = window["origin/k"].to_index_t();
     }
 
-    int dims[3];
-    dims[0] = window["dims/i"].to_int32();
-    dims[1] = window["dims/j"].to_int32();
+    conduit::index_t dims[3];
+    dims[0] = window["dims/i"].to_index_t();
+    dims[1] = window["dims/j"].to_index_t();
     if(is_3d)
     {
-      dims[2] = window["dims/k"].to_int32();
+      dims[2] = window["dims/k"].to_index_t();
     }
     if(is_3d)
     {
       // all the nesting relationship is local
-      for(int z = origin[2]; z < origin[2] + dims[2]; ++z)
+      for(index_t z = origin[2]; z < origin[2] + dims[2]; ++z)
       {
-        const int z_offset = z * el_dims[0] * el_dims[1];
+        const conduit::index_t z_offset = z * el_dims[0] * el_dims[1];
         for(int y = origin[1]; y < origin[1] + dims[1]; ++y)
         {
-          const conduit::int32 y_offset = y * el_dims[0];
+          const conduit::index_t y_offset = y * el_dims[0];
           for(int x = origin[0]; x < origin[0] + dims[0]; ++x)
           {
             // this might a ghost field, but we only want to
             // mask real zones that are masked by finer grids
-            conduit::int32 value = levels[z_offset + y_offset + x];
+            conduit::index_t value = levels[z_offset + y_offset + x];
             if(value == 0)
             {
               levels[z_offset + y_offset + x] = 1;
@@ -2634,14 +2636,14 @@ void paint_nestsets(const std::string nestset_name,
     else
     {
       // all the nesting relationship is local
-      for(int y = origin[1]; y < origin[1] + dims[1]; ++y)
+      for(conduit::index_t y = origin[1]; y < origin[1] + dims[1]; ++y)
       {
-        const conduit::int32 y_offset = y * el_dims[0];
-        for(int x = origin[0]; x < origin[0] + dims[0]; ++x)
+        const conduit::index_t y_offset = y * el_dims[0];
+        for(conduit::index_t x = origin[0]; x < origin[0] + dims[0]; ++x)
         {
           // this might a ghost field, but we only want to
           // mask real zones that are masked by finer grids
-          conduit::int32 value = levels[y_offset + x];
+          conduit::index_t value = levels[y_offset + x];
           if(value == 0)
           {
             levels[y_offset + x] = 1;
@@ -2692,61 +2694,6 @@ std::set topology_names(const conduit::Node &dataset)
   return topos;
 }
 
-bool field_is_float32(const conduit::Node &field)
-{
-  const int children = field["values"].number_of_children();
-  if(children == 0)
-  {
-    return field["values"].dtype().is_float32();
-  }
-  else
-  {
-    // there has to be one or more children so ask the first
-    return field["values"].child(0).dtype().is_float32();
-  }
-}
-
-bool field_is_float64(const conduit::Node &field)
-{
-  const int children = field["values"].number_of_children();
-  if(children == 0)
-  {
-    return field["values"].dtype().is_float64();
-  }
-  else
-  {
-    // there has to be one or more children so ask the first
-    return field["values"].child(0).dtype().is_float64();
-  }
-}
-
-bool field_is_int32(const conduit::Node &field)
-{
-  const int children = field["values"].number_of_children();
-  if(children == 0)
-  {
-    return field["values"].dtype().is_int32();
-  }
-  else
-  {
-    // there has to be one or more children so ask the first
-    return field["values"].child(0).dtype().is_int32();
-  }
-}
-
-bool field_is_int64(const conduit::Node &field)
-{
-  const int children = field["values"].number_of_children();
-  if(children == 0)
-  {
-    return field["values"].dtype().is_int64();
-  }
-  else
-  {
-    // there has to be one or more children so ask the first
-    return field["values"].child(0).dtype().is_int64();
-  }
-}
 
 Array
 centroids(const conduit::Node &domain, const std::string topo)
diff --git a/src/libs/ascent/runtimes/expressions/ascent_blueprint_architect.hpp b/src/libs/ascent/runtimes/expressions/ascent_blueprint_architect.hpp
index b36fa4960..d6bde276b 100644
--- a/src/libs/ascent/runtimes/expressions/ascent_blueprint_architect.hpp
+++ b/src/libs/ascent/runtimes/expressions/ascent_blueprint_architect.hpp
@@ -94,7 +94,7 @@ conduit::Node global_bounds(const conduit::Node &dataset,
 //
 // NOTE: ascent_data_binning contains a RAJA version
 // of binning that needs more work, but should eventually
-// supercede these versions
+// supersede these versions
 // 
 
 ASCENT_API
@@ -133,7 +133,6 @@ bool has_topology(const conduit::Node &dataset, const std::string &topo_name);
 ASCENT_API
 std::set topology_names(const conduit::Node &dataset);
 
-//std::string known_topos(const conduit::Node &dataset);
 
 ASCENT_API
 bool has_component(const conduit::Node &dataset,
@@ -178,17 +177,6 @@ int num_points(const conduit::Node &domain, const std::string &topo_name);
 ASCENT_API
 int num_cells(const conduit::Node &domain, const std::string &topo_name);
 
-ASCENT_API
-bool field_is_float32(const conduit::Node &field);
-
-ASCENT_API
-bool field_is_float64(const conduit::Node &field);
-
-ASCENT_API
-bool field_is_int32(const conduit::Node &field);
-
-ASCENT_API
-bool field_is_int64(const conduit::Node &field);
 
 ASCENT_API
 Array
diff --git a/src/libs/ascent/runtimes/expressions/ascent_blueprint_device_dispatch.hpp b/src/libs/ascent/runtimes/expressions/ascent_blueprint_device_dispatch.hpp
new file mode 100644
index 000000000..c7c1f5dc5
--- /dev/null
+++ b/src/libs/ascent/runtimes/expressions/ascent_blueprint_device_dispatch.hpp
@@ -0,0 +1,596 @@
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+// Copyright (c) Lawrence Livermore National Security, LLC and other Ascent
+// Project developers. See top-level LICENSE AND COPYRIGHT files for dates and
+// other details. No copyright assignment is required to contribute to Ascent.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+#ifndef ASCENT_BLUEPRINT_DEVICE_DISPATCH_HPP
+#define ASCENT_BLUEPRINT_DEVICE_DISPATCH_HPP
+
+#include "ascent_execution_policies.hpp"
+#include "ascent_execution_manager.hpp"
+#include "ascent_memory_manager.hpp"
+#include "ascent_array.hpp"
+
+#include "ascent_blueprint_type_utils.hpp"
+#include "ascent_blueprint_device_mesh_objects.hpp"
+
+//-----------------------------------------------------------------------------
+// -- begin ascent:: --
+//-----------------------------------------------------------------------------
+namespace ascent
+{
+
+//-----------------------------------------------------------------------------
+// -- begin ascent::runtime --
+//-----------------------------------------------------------------------------
+namespace runtime
+{
+
+//-----------------------------------------------------------------------------
+// -- begin ascent::runtime::expressions--
+//-----------------------------------------------------------------------------
+namespace expressions
+{
+
+
+//-----------------------------------------------------------------------------
+// exec_dispatch_{type} variants:
+//   exec_dispatch_function
+//   exec_dispatch_array
+//   exec_dispatch_mcarray_component
+//   exec_dispatch_mesh
+//
+//   exec_dispatch_two_leaves <-- bad name!
+//
+//-----------------------------------------------------------------------------
+
+////////////////////////////////////////////////////////////////////////////////////
+// TODO NEEDS A BETTER NAME !!!!!
+// TODO THIS NEEDS TO BE RAJAFIED
+template
+conduit::Node
+exec_dispatch_two_leaves(const conduit::Node &values0,
+                         const conduit::Node &values1,
+                         const Function &func)
+{
+  // check for single component scalar
+  int num_children0 = values0.number_of_children();
+  int num_children1 = values1.number_of_children();
+  if(num_children0 > 1 || num_children1 > 1)
+  {
+    ASCENT_ERROR("exec_dispatch_two_leaves: Internal error: expected leaf arrays.");
+  }
+  const conduit::Node &vals0 = num_children0 == 0 ? values0 : values0.child(0);
+  const conduit::Node &vals1 = num_children1 == 0 ? values1 : values1.child(0);
+
+  conduit::Node res;
+  const int num_vals0 = vals0.dtype().number_of_elements();
+  const int num_vals1 = vals1.dtype().number_of_elements();
+
+  if(vals0.dtype().is_float32())
+  {
+    const conduit::float32 *ptr0 =  vals0.as_float32_ptr();
+    if(vals1.dtype().is_float32()) {
+      const conduit::float32 *ptr1 =  vals1.as_float32_ptr();
+      res = func(ptr0, ptr1, num_vals0, num_vals1);
+    }
+    else if(vals1.dtype().is_float64()) {
+      const conduit::float64 *ptr1 =  vals1.as_float64_ptr();
+      res = func(ptr0, ptr1, num_vals0, num_vals1);
+    }
+    else if(vals1.dtype().is_int32()) {
+      const conduit::int32 *ptr1 =  vals1.as_int32_ptr();
+      res = func(ptr0, ptr1, num_vals0, num_vals1);
+    }
+    else if(vals1.dtype().is_int64()) {
+      const conduit::int64 *ptr1 =  vals1.as_int64_ptr();
+      res = func(ptr0, ptr1, num_vals0, num_vals1);
+    }
+    else {
+      ASCENT_ERROR("exec_dispatch_two_leaves: unsupported array type for array1: "<< values1.schema().to_string());
+    }
+  }
+  else if(vals0.dtype().is_float64())
+  {
+    const conduit::float64 *ptr0 =  vals0.as_float64_ptr();
+    if(vals1.dtype().is_float32()) {
+      const conduit::float32 *ptr1 =  vals1.as_float32_ptr();
+      res = func(ptr0, ptr1, num_vals0, num_vals1);
+    }
+    else if(vals1.dtype().is_float64()) {
+      const conduit::float64 *ptr1 =  vals1.as_float64_ptr();
+      res = func(ptr0, ptr1, num_vals0, num_vals1);
+    }
+    else if(vals1.dtype().is_int32()) {
+      const conduit::int32 *ptr1 =  vals1.as_int32_ptr();
+      res = func(ptr0, ptr1, num_vals0, num_vals1);
+    }
+    else if(vals1.dtype().is_int64()) {
+      const conduit::int64 *ptr1 =  vals1.as_int64_ptr();
+      res = func(ptr0, ptr1, num_vals0, num_vals1);
+    }
+    else {
+      ASCENT_ERROR("exec_dispatch_two_leaves: unsupported array type for array1: "<< values1.schema().to_string());
+    }
+  }
+  else if(vals0.dtype().is_int32())
+  {
+    const conduit::int32 *ptr0 =  vals0.as_int32_ptr();
+    if(vals1.dtype().is_float32()) {
+      const conduit::float32 *ptr1 =  vals1.as_float32_ptr();
+      res = func(ptr0, ptr1, num_vals0, num_vals1);
+    }
+    else if(vals1.dtype().is_float64()) {
+      const conduit::float64 *ptr1 =  vals1.as_float64_ptr();
+      res = func(ptr0, ptr1, num_vals0, num_vals1);
+    }
+    else if(vals1.dtype().is_int32()) {
+      const conduit::int32 *ptr1 =  vals1.as_int32_ptr();
+      res = func(ptr0, ptr1, num_vals0, num_vals1);
+    }
+    else if(vals1.dtype().is_int64()) {
+      const conduit::int64 *ptr1 =  vals1.as_int64_ptr();
+      res = func(ptr0, ptr1, num_vals0, num_vals1);
+    }
+    else {
+      ASCENT_ERROR("exec_dispatch_two_leaves: unsupported array type for array1: "<< values1.schema().to_string());
+    }
+  }
+  else if(vals0.dtype().is_int64())
+  {
+    const conduit::int64 *ptr0 =  vals0.as_int64_ptr();
+    if(vals1.dtype().is_float32()) {
+      const conduit::float32 *ptr1 =  vals1.as_float32_ptr();
+      res = func(ptr0, ptr1, num_vals0, num_vals1);
+    }
+    else if(vals1.dtype().is_float64()) {
+      const conduit::float64 *ptr1 =  vals1.as_float64_ptr();
+      res = func(ptr0, ptr1, num_vals0, num_vals1);
+    }
+    else if(vals1.dtype().is_int32()) {
+      const conduit::int32 *ptr1 =  vals1.as_int32_ptr();
+      res = func(ptr0, ptr1, num_vals0, num_vals1);
+    }
+    else if(vals1.dtype().is_int64()) {
+      const conduit::int64 *ptr1 =  vals1.as_int64_ptr();
+      res = func(ptr0, ptr1, num_vals0, num_vals1);
+    }
+    else {
+      ASCENT_ERROR("exec_dispatch_two_leaves: unsupported array type for array1: "<< values1.schema().to_string());
+    }
+  }
+  else
+  {
+    ASCENT_ERROR("exec_dispatch_two_leavesh: unsupported array type for array0: "<<
+                  values0.schema().to_string());
+  }
+  return res;
+}
+////////////////////////////////////////////////////////////////////////////////////
+
+
+//-----------------------------------------------------------------------------
+template
+conduit::Node exec_dispatch_mcarray_component(const conduit::Node &node,
+                                              const std::string &component,
+                                              const Function &func,
+                                              const Exec &exec)
+{
+  const std::string mem_space = Exec::memory_space;
+
+  conduit::Node res;
+  if(mcarray_is_float32(node))
+  {
+    MCArray farray(node);
+    DeviceAccessor accessor = farray.accessor(mem_space,component);
+    res = func(accessor, exec);
+  }
+  else if(mcarray_is_float64(node))
+  {
+    MCArray farray(node);
+    DeviceAccessor accessor = farray.accessor(mem_space,component);
+    res = func(accessor, exec);
+  }
+  else if(mcarray_is_int32(node))
+  {
+    MCArray farray(node);
+    DeviceAccessor accessor = farray.accessor(mem_space,component);
+    res = func(accessor, exec);
+  }
+  else if(mcarray_is_int64(node))
+  {
+    MCArray farray(node);
+    DeviceAccessor accessor = farray.accessor(mem_space,component);
+    res = func(accessor, exec);
+  }
+  else
+  {
+    ASCENT_ERROR("exec_dispatch_mcarray_component: unsupported type "<<
+                  node.schema().to_string());
+  }
+  return res;
+}
+
+
+
+//-----------------------------------------------------------------------------
+template
+conduit::Node
+exec_dispatch_mcarray_component(const conduit::Node &node,
+                                const std::string &component,
+                                const Function &func)
+{
+
+  conduit::Node res;
+  const std::string exec_policy = ExecutionManager::execution_policy();
+  //std::cout<<"Exec policy "<
+void
+exec_dispatch_mesh(const conduit::Node &n_coords,
+                   const conduit::Node &n_topo,
+                   Function &func,
+                   const Exec &exec)
+{
+  const std::string mem_space = Exec::memory_space;
+  const std::string mesh_type = n_topo["type"].as_string();
+
+  if(mesh_type == "unstructured")
+  {
+    const int shape_type = cell_shape(n_topo["elements/shape"].as_string());
+    const int dims = n_coords["values"].number_of_children();
+
+    if(dims < 2 || dims > 3)
+    {
+      std::cout<<"Bad dims "<(n_coords["values/x"]))
+    {
+      MCArray coords(n_coords["values"]);
+
+      if(is_conduit_type(n_topo[conn_path]))
+      {
+        MCArray conn(n_topo[conn_path]);
+        UnstructuredMesh mesh(mem_space,
+                                                               coords,
+                                                               conn,
+                                                               shape_type,
+                                                               dims);
+        func(mesh,exec);
+      }
+      else if(is_conduit_type(n_topo[conn_path]))
+      {
+        MCArray conn(n_topo[conn_path]);
+        UnstructuredMesh mesh(mem_space,
+                                                               coords,
+                                                               conn,
+                                                               shape_type,
+                                                               dims);
+        func(mesh,exec);
+      }
+      else
+      {
+        std::cout<<"bad topo "<(n_coords["values/x"]))
+    {
+      MCArray coords(n_coords["values"]);
+
+      if(is_conduit_type(n_topo[conn_path]))
+      {
+        MCArray conn(n_topo["conn_path"]);
+        UnstructuredMesh mesh(mem_space,
+                                                               coords,
+                                                               conn,
+                                                               shape_type,
+                                                               dims);
+        func(mesh,exec);
+      }
+      else if(is_conduit_type(n_topo[conn_path]))
+      {
+        MCArray conn(n_topo[conn_path]);
+        UnstructuredMesh mesh(mem_space,
+                                                               coords,
+                                                               conn,
+                                                               shape_type,
+                                                               dims);
+        func(mesh,exec);
+      }
+      else
+      {
+        std::cout<<"bad topo "< 3)
+    {
+      std::cout<<"Bad dims "<(n_coords["values/x"]))
+    {
+      MCArray coords(n_coords["values"]);
+      RectilinearMesh mesh(mem_space,
+                                             coords,
+                                             dims);
+      func(mesh,exec);
+    }
+    else if(is_conduit_type(n_coords["values/x"]))
+    {
+      MCArray coords(n_coords["values"]);
+      RectilinearMesh mesh(mem_space,
+                                             coords,
+                                             dims);
+      func(mesh,exec);
+    }
+    else
+    {
+      std::cout<<"Bad coordinates type rectilinear\n";
+    }
+  }
+  else if(mesh_type == "structured")
+  {
+    const int dims = n_coords["values"].number_of_children();
+    if(dims < 2 || dims > 3)
+    {
+      std::cout<<"Bad dims "<(n_coords["values/x"]))
+    {
+      MCArray coords(n_coords["values"]);
+      StructuredMesh mesh(mem_space,
+                                            coords,
+                                            dims,
+                                            point_dims);
+      func(mesh,exec);
+    }
+    else if(is_conduit_type(n_coords["values/x"]))
+    {
+      MCArray coords(n_coords["values"]);
+      StructuredMesh mesh(mem_space,
+                                            coords,
+                                            dims,
+                                            point_dims);
+      func(mesh,exec);
+    }
+    else
+    {
+      std::cout<<"Bad coordinates type structured\n";
+    }
+  }
+  else
+  {
+    std::cout<<"exec_dispatch_mesh: mesh type not implemented:  "<
+void
+exec_dispatch_mesh(const conduit::Node &n_coords,
+                   const conduit::Node &n_topo,
+                   Function &func)
+{
+
+  const std::string exec_policy = ExecutionManager::execution_policy();
+
+  //std::cout<<"Mesh Exec policy "<
+void
+exec_dispatch_array(Array &array, Function &func)
+{
+  const std::string exec_policy = ExecutionManager::execution_policy();
+
+  //std::cout<<"Array Exec policy "<
+void
+exec_dispatch_function(Function &func)
+{
+  const std::string exec_policy = ExecutionManager::execution_policy();
+
+  //std::cout<<"Exec only policy "<
+#include "ascent_execution_policies.hpp"
+#include 
+#include "ascent_memory_manager.hpp"
+#include "ascent_blueprint_device_mesh_objects.hpp"
+#include "ascent_array.hpp"
+#include "ascent_execution_policies.hpp"
+
+//-----------------------------------------------------------------------------
+// -- begin ascent:: --
+//-----------------------------------------------------------------------------
+namespace ascent
+{
+
+//-----------------------------------------------------------------------------
+// -- begin ascent::runtime --
+//-----------------------------------------------------------------------------
+namespace runtime
+{
+
+//-----------------------------------------------------------------------------
+// -- begin ascent::runtime::expressions--
+//-----------------------------------------------------------------------------
+namespace expressions
+{
+
+
+using index_t = conduit::index_t;
+
+//---------------------------------------------------------------------------//
+//---------------------------------------------------------------------------//
+// begin is_conduit_type
+//---------------------------------------------------------------------------//
+//---------------------------------------------------------------------------//
+template
+inline bool is_conduit_type(const conduit::Node &values);
+
+//---------------------------------------------------------------------------//
+template<>
+inline bool is_conduit_type(const conduit::Node &values)
+{
+  return values.dtype().is_float64();
+}
+
+//---------------------------------------------------------------------------//
+template<>
+inline bool is_conduit_type(const conduit::Node &values)
+{
+  return values.dtype().is_float32();
+}
+
+//---------------------------------------------------------------------------//
+template<>
+inline bool is_conduit_type(const conduit::Node &values)
+{
+  return values.dtype().is_int32();
+}
+
+//---------------------------------------------------------------------------//
+template<>
+inline bool is_conduit_type(const conduit::Node &values)
+{
+  return values.dtype().is_int64();
+}
+
+//---------------------------------------------------------------------------//
+//---------------------------------------------------------------------------//
+// end is_conduit_type
+//---------------------------------------------------------------------------//
+//---------------------------------------------------------------------------//
+
+//---------------------------------------------------------------------------//
+//---------------------------------------------------------------------------//
+// begin conduit_ptr
+//---------------------------------------------------------------------------//
+//---------------------------------------------------------------------------//
+template
+inline T* conduit_ptr(const conduit::Node &values);
+
+//---------------------------------------------------------------------------//
+template<>
+inline conduit::float64 * conduit_ptr(const conduit::Node &values)
+{
+  return const_cast(values.as_float64_ptr());
+}
+
+//---------------------------------------------------------------------------//
+template<>
+inline conduit::float32 * conduit_ptr(const conduit::Node &values)
+{
+  return const_cast(values.as_float32_ptr());
+}
+
+//---------------------------------------------------------------------------//
+template<>
+inline conduit::int32 * conduit_ptr(const conduit::Node &values)
+{
+  return const_cast(values.as_int32_ptr());
+}
+//---------------------------------------------------------------------------//
+template<>
+inline conduit::int64 * conduit_ptr(const conduit::Node &values)
+{
+  return const_cast(values.as_int64_ptr());
+}
+
+//---------------------------------------------------------------------------//
+//---------------------------------------------------------------------------//
+// end conduit_ptr
+//---------------------------------------------------------------------------//
+//---------------------------------------------------------------------------//
+
+
+//---------------------------------------------------------------------------//
+ASCENT_EXEC
+static int num_indices(const int shape_id)
+{
+  int indices = 0;
+  if(shape_id == 5)
+  {
+    indices = 3;
+  }
+  else if(shape_id == 9)
+  {
+    indices = 4;
+  }
+  else if(shape_id == 10)
+  {
+    indices = 4;
+  }
+  else if(shape_id == 12)
+  {
+    indices = 8;
+  }
+  else if(shape_id == 1)
+  {
+    indices = 1;
+  }
+  else if(shape_id == 3)
+  {
+    indices = 2;
+  }
+  return indices;
+}
+
+
+//---------------------------------------------------------------------------//
+// Vec
+//---------------------------------------------------------------------------//
+template
+class Vec
+{
+public:
+  T m_data[S];
+
+  ASCENT_EXEC const T &operator[] (const int &i) const
+  {
+    return m_data[i];
+  }
+
+  ASCENT_EXEC T &operator[] (const int &i)
+  {
+    return m_data[i];
+  }
+};
+
+//---------------------------------------------------------------------------//
+// DeviceAccessor
+//---------------------------------------------------------------------------//
+template
+struct DeviceAccessor
+{
+  const T *m_values;
+  const index_t m_size;
+  const index_t m_offset;
+  const index_t m_stride;
+
+  //==---------------------------------------------------------------------==//
+  DeviceAccessor(const T *values, const conduit::DataType &dtype)
+    : m_values(values),
+      m_size(dtype.number_of_elements()),
+      // conduit strides and offsets are in terms of bytes
+      m_offset(dtype.offset() / sizeof(T)),
+      m_stride(dtype.stride() / sizeof(T))
+  {
+
+  }
+
+  //==---------------------------------------------------------------------==//
+  ASCENT_EXEC
+  T operator[](const index_t index) const
+  {
+    return m_values[m_offset + m_stride * index];
+  }
+protected:
+  DeviceAccessor(){};
+};
+
+//---------------------------------------------------------------------------//
+// MCArray
+//---------------------------------------------------------------------------//
+//-- Note: This supports both MCArrays and Leaf Arrays!
+//---------------------------------------------------------------------------//
+template
+class MCArray
+{
+private:
+  // src node
+  const conduit::Node  &m_src_node;
+  // used if we need to make any host or device copies
+  conduit::Node        m_tmps;
+   // num comps
+  int                  m_components;
+  // sizes for each comp
+  std::vector m_sizes;
+
+public:
+  //==---------------------------------------------------------------------==//
+  // No default constructor
+  MCArray() = delete;
+
+  //==---------------------------------------------------------------------==//
+  // Main constructor
+  MCArray(const conduit::Node &node)
+    : m_src_node(node)
+  {
+    int children = m_src_node.number_of_children();
+    if(children == 0 || children == 1)
+    {
+      m_components = 1;
+    }
+    else
+    {
+      m_components = children;
+    }
+
+    m_sizes.resize(m_components);
+
+    bool types_match = true;
+    if(children == 0)
+    {
+      types_match = is_conduit_type(m_src_node);
+      m_sizes[0] = m_src_node.dtype().number_of_elements();
+    }
+    else
+    {
+      for(int i = 0; i < children; ++i)
+      {
+        types_match &= is_conduit_type(m_src_node.child(i));
+        m_sizes[i] = m_src_node.child(i).dtype().number_of_elements();
+      }
+    }
+
+    if(!types_match)
+    {
+      std::string schema = m_src_node.schema().to_yaml();
+      ASCENT_ERROR("MCArray type does not match conduit type: "<= m_sizes[comp_idx])
+    //{
+    //  std::cout<<"[MCarray] Invalid index "<= m_sizes[component])
+    //{
+    //  std::cout<<"[MCarray] Invalid index "<= m_components)
+    {
+      ASCENT_ERROR("Invalid component "< 0)
+    {
+      leaf_path = m_src_node.child(component).name();
+    }
+    return leaf_path;
+  }
+
+  //==---------------------------------------------------------------------==//
+  // get the raw pointer used by conduit and return the path
+  const T *raw_ptr(int component, std::string &leaf_path)
+  {
+    leaf_path = component_path(component);
+    if(leaf_path != "")
+    {
+        return conduit_ptr(m_src_node[leaf_path]);
+    }
+    else
+    {
+        return conduit_ptr(m_src_node);
+    }
+  }
+
+  //==---------------------------------------------------------------------==//
+  int resolve_component(const std::string &component)
+  {
+    int component_idx = 0;
+
+    // im going to allow blank names for component 0 since
+    // an mcarray is ambiguous with a single component
+    if(m_components == 1 && component == "")
+    {
+      return component_idx;
+    }
+    else
+    {
+      const int children = m_src_node.number_of_children();
+      bool match = false;
+      for(int i = 0; i < children; ++i)
+      {
+        if(component == m_src_node.child(i).name())
+        {
+          component_idx = i;
+          match = true;
+          break;
+        }
+      }
+      if(!match)
+      {
+        ASCENT_ERROR("No component named '"<(m_tmps[d_path]);
+    }
+#else
+    //std::cout<<"just returning ptr\n";
+    return ptr;
+#endif
+  }
+
+  //==---------------------------------------------------------------------==//
+  const T *host_ptr_const(int component)
+  {
+    std::string leaf_path;
+    const T * ptr = raw_ptr(component,leaf_path);
+
+#if defined(ASCENT_DEVICE_ENABLED)
+    bool is_unified;
+    bool is_gpu;
+    DeviceMemory::is_device_ptr(ptr,is_gpu, is_unified);
+    bool is_host_accessible =  !is_gpu || (is_gpu && is_unified);
+    
+    if(is_unified)
+    {
+      //std::cout<<"Unified\n";
+    }
+
+    if(is_gpu)
+    {
+      //std::cout<<"gpu\n";
+    }
+
+    if(is_host_accessible)
+    {
+      //std::cout<<"already a host pointer\n";
+      return ptr;
+    }
+    else
+    {
+      std::string h_path = "host";
+      if(leaf_path != "")
+      {
+          h_path += "_" + leaf_path;
+      }
+
+      if(!m_tmps.has_path(h_path))
+      {
+        //std::cout<<"Creating host pointer\n";
+        conduit::Node &n_host = m_tmps[h_path];
+        n_host.set_allocator(AllocationManager::conduit_host_allocator_id());
+        n_host.set(ptr, m_sizes[component]);
+      }
+      //else std::cout<<"already host_values\n";
+      return conduit_ptr(m_tmps[h_path]);
+    }
+#else
+    //std::cout<<"just returning ptr\n";
+    return ptr;
+#endif
+  }
+
+  //==---------------------------------------------------------------------==//
+  // can make string param that specifies the device
+  // TODO: this will not be the way to access ptrs going forward
+  const T *ptr_const(const std::string &location = "device")
+  {
+    if(location != "host" && location != "device")
+    {
+      ASCENT_ERROR("Invalid location: '"< accessor(const std::string location = "device",
+                             const std::string comp = "")
+  {
+    if(location != "device" && location != "host")
+    {
+      ASCENT_ERROR("Bad location string '"<(ptr, m_src_node[leaf_path].dtype());
+    }
+    else
+    {
+        return DeviceAccessor(ptr, m_src_node.dtype());
+    }
+  }
+
+};
+
+//---------------------------------------------------------------------------//
+ASCENT_EXEC
+void
+mesh_logical_index_2d(int *idx, const int vert_index, const int *dims)
+{
+  idx[0] = vert_index % dims[0];
+  idx[1] = vert_index / dims[0];
+}
+
+//---------------------------------------------------------------------------//
+ASCENT_EXEC
+void
+mesh_logical_index_3d(int *idx, const int vert_index, const int *dims)
+{
+  idx[0] = vert_index % dims[0];
+  idx[1] = (vert_index / dims[0]) % dims[1];
+  idx[2] = vert_index / (dims[0] * dims[1]);
+}
+
+//---------------------------------------------------------------------------//
+ASCENT_EXEC
+void structured_cell_indices(const int cell_index,
+                             const Vec &point_dims,
+                             const int dims, // 2d or 3d
+                             int indices[8])
+{
+  const int element_dims[3] = {point_dims[0]-1,
+                               point_dims[1]-1,
+                               point_dims[2]-1};
+  int element_index[3];
+  if(dims == 2)
+  {
+    mesh_logical_index_2d(element_index, cell_index, element_dims);
+
+    indices[0] = element_index[1] * point_dims[0] + element_index[0];
+    indices[1] = indices[0] + 1;
+    indices[2] = indices[1] + point_dims[0];
+    indices[3] = indices[2] - 1;
+  }
+  else
+  {
+    mesh_logical_index_3d(element_index, cell_index, element_dims);
+
+    indices[0] =
+        (element_index[2] * point_dims[1] + element_index[1])
+         * point_dims[0] + element_index[0];
+    indices[1] = indices[0] + 1;
+    indices[2] = indices[1] + point_dims[1];
+    indices[3] = indices[2] - 1;
+    indices[4] = indices[0] + point_dims[0] * point_dims[2];
+    indices[5] = indices[4] + 1;
+    indices[6] = indices[5] + point_dims[1];
+    indices[7] = indices[6] - 1;
+  }
+}
+
+//---------------------------------------------------------------------------//
+// UniformMesh
+//---------------------------------------------------------------------------//
+struct UniformMesh
+{
+  Vec m_point_dims;
+  Vec m_origin;
+  Vec m_spacing;
+  int m_dims;
+  int m_num_cells;
+  int m_num_indices;
+  int m_num_points;
+
+  //==---------------------------------------------------------------------==//
+  UniformMesh() = delete;
+
+  //==---------------------------------------------------------------------==//
+  UniformMesh(const conduit::Node &n_coords)
+  {
+    const conduit::Node &n_dims = n_coords["dims"];
+    // assume we have a valid dataset
+    m_point_dims[0] = n_dims["i"].to_int();
+    m_point_dims[1] = n_dims["j"].to_int();
+    m_point_dims[2] = 1;
+    m_dims = 2;
+    // check for 3d
+    if(n_dims.has_path("k"))
+    {
+      m_point_dims[2] = n_dims["k"].to_int();
+      m_dims = 3;
+    }
+
+    m_origin[0] = 0.0;
+    m_origin[1] = 0.0;
+    m_origin[2] = 0.0;
+
+    m_spacing[0] = 1.0;
+    m_spacing[1] = 1.0;
+    m_spacing[2] = 1.0;
+
+    if(n_coords.has_child("origin"))
+    {
+      const conduit::Node &n_origin = n_coords["origin"];
+
+      if(n_origin.has_child("x"))
+      {
+        m_origin[0] = n_origin["x"].to_float64();
+      }
+
+      if(n_origin.has_child("y"))
+      {
+        m_origin[1] = n_origin["y"].to_float64();
+      }
+
+      if(n_origin.has_child("z"))
+      {
+        m_origin[2] = n_origin["z"].to_float64();
+      }
+    }
+
+    if(n_coords.has_path("spacing"))
+    {
+      const conduit::Node &n_spacing = n_coords["spacing"];
+
+      if(n_spacing.has_path("dx"))
+      {
+        m_spacing[0] = n_spacing["dx"].to_float64();
+      }
+
+      if(n_spacing.has_path("dy"))
+      {
+        m_spacing[1] = n_spacing["dy"].to_float64();
+      }
+
+      if(n_spacing.has_path("dz"))
+      {
+        m_spacing[2] = n_spacing["dz"].to_float64();
+      }
+    }
+
+    m_num_points = m_point_dims[0] * m_point_dims[1];
+    m_num_cells = (m_point_dims[0] - 1) *(m_point_dims[1] - 1);
+    if(m_dims == 3)
+    {
+      m_num_cells *= m_point_dims[2] - 1;
+      m_num_points = m_point_dims[2];
+    }
+
+    if(m_dims == 3)
+    {
+      m_num_indices = 8;
+    }
+    else
+    {
+      m_num_indices = 4;
+    }
+
+
+  }
+
+  //==---------------------------------------------------------------------==//
+  ASCENT_EXEC
+  void cell_indices(const int cell_index, int indices[8]) const
+  {
+    structured_cell_indices(cell_index,
+                            m_point_dims,
+                            m_dims,
+                            indices);
+  }
+
+  //==---------------------------------------------------------------------==//
+  ASCENT_EXEC
+  void vertex(const int vert_id, double vert[3]) const
+  {
+    int logical_idx[3];
+    int pdims[3] = {m_point_dims[0],
+                    m_point_dims[1],
+                    m_point_dims[2]};
+    if(m_dims == 2)
+    {
+      mesh_logical_index_2d(logical_idx, vert_id, pdims);
+    }
+    else
+    {
+      mesh_logical_index_3d(logical_idx, vert_id, pdims);
+    }
+
+    vert[0] = m_origin[0] + logical_idx[0] * m_spacing[0];
+    vert[1] = m_origin[1] + logical_idx[1] * m_spacing[1];
+    if(m_dims == 3)
+    {
+      vert[2] = m_origin[2] + logical_idx[2] * m_spacing[2];
+    }
+    else
+    {
+      vert[2] = 0.;
+    }
+
+  }
+
+};
+
+//---------------------------------------------------------------------------//
+// StructuredMesh
+//---------------------------------------------------------------------------//
+template
+struct StructuredMesh
+{
+
+  DeviceAccessor m_coords_x;
+  DeviceAccessor m_coords_y;
+  DeviceAccessor m_coords_z;
+  const int m_dims;
+  const Vec m_point_dims;
+  const int m_num_indices;
+  const int m_num_cells;
+  const int m_num_points;
+
+  //==---------------------------------------------------------------------==//
+  StructuredMesh() = delete;
+
+  //==---------------------------------------------------------------------==//
+  StructuredMesh(const std::string mem_space,
+                 MCArray &coords,
+                 const int dims,
+                 const int point_dims[3])
+    : m_coords_x(coords.accessor(mem_space, "x")),
+      m_coords_y(coords.accessor(mem_space, "y")),
+      m_coords_z(dims == 3 ? coords.accessor(mem_space, "z") :
+                             // just use a dummy in this case
+                             coords.accessor(mem_space, "x")),
+      m_dims(dims),
+      m_point_dims({{point_dims[0],
+                     point_dims[1],
+                     point_dims[2]}}),
+      m_num_indices(m_dims == 2 ? 4 : 8),
+      m_num_cells(m_dims == 2 ? (m_point_dims[0] - 1) *
+                                (m_point_dims[1] - 1)
+                              : (m_point_dims[0] - 1) *
+                                (m_point_dims[1] - 1) *
+                                (m_point_dims[2] - 1)),
+      m_num_points(m_dims == 2 ? (m_point_dims[0]) *
+                                 (m_point_dims[1])
+                               : (m_point_dims[0]) *
+                                 (m_point_dims[1]) *
+                                 (m_point_dims[2]))
+  {
+  }
+
+  //==---------------------------------------------------------------------==//
+  // TODO: some sort of error checking mechanism
+  ASCENT_EXEC
+  void cell_indices(const int cell_index, int indices[8]) const
+  {
+    structured_cell_indices(cell_index,
+                            m_point_dims,
+                            m_dims,
+                            indices);
+  }
+
+  //==---------------------------------------------------------------------==//
+  ASCENT_EXEC
+  void vertex(const int vert_id, double vert[3]) const
+  {
+    vert[0] = static_cast(m_coords_x[vert_id]);
+    vert[1] = static_cast(m_coords_y[vert_id]);
+    if(m_dims == 3)
+    {
+      vert[2] = static_cast(m_coords_z[vert_id]);
+    }
+    else
+    {
+      vert[2] = 0.;
+    }
+  }
+
+};
+
+//---------------------------------------------------------------------------//
+// RectilinearMesh
+//---------------------------------------------------------------------------//
+template
+struct RectilinearMesh
+{
+
+  DeviceAccessor m_coords_x;
+  DeviceAccessor m_coords_y;
+  DeviceAccessor m_coords_z;
+  const int m_dims;
+  const Vec m_point_dims;
+  const int m_num_indices;
+  const int m_num_cells;
+  const int m_num_points;
+
+  //==---------------------------------------------------------------------==//
+  RectilinearMesh() = delete;
+
+  //==---------------------------------------------------------------------==//
+  RectilinearMesh(const std::string mem_space,
+                  MCArray &coords,
+                  const int dims)
+    : m_coords_x(coords.accessor(mem_space, "x")),
+      m_coords_y(coords.accessor(mem_space, "y")),
+      m_coords_z(dims == 3 ? coords.accessor(mem_space, "z") :
+                             // just use a dummy in this case
+                             coords.accessor(mem_space, "x")),
+      m_dims(dims),
+      m_point_dims({{(int)m_coords_x.m_size,
+                     (int)m_coords_y.m_size,
+                     (int)m_coords_z.m_size}}),
+      m_num_indices(m_dims == 2 ? 4 : 8),
+      m_num_cells(m_dims == 2 ? (m_point_dims[0] - 1) *
+                                (m_point_dims[1] - 1)
+                              : (m_point_dims[0] - 1) *
+                                (m_point_dims[1] - 1) *
+                                (m_point_dims[2] - 1)),
+      m_num_points(m_dims == 2 ? (m_point_dims[0]) *
+                                 (m_point_dims[1])
+                               : (m_point_dims[0]) *
+                                 (m_point_dims[1]) *
+                                 (m_point_dims[2]))
+  {
+  }
+
+  //==---------------------------------------------------------------------==//
+  // TODO: some sort of error checking mechanism
+  ASCENT_EXEC
+  void cell_indices(const int cell_index, int indices[8]) const
+  {
+    structured_cell_indices(cell_index,
+                            m_point_dims,
+                            m_dims,
+                            indices);
+  }
+
+  //==---------------------------------------------------------------------==//
+  ASCENT_EXEC
+  void vertex(const int vert_id, double vert[3]) const
+  {
+    int logical_idx[3];
+    int pdims[3] = {m_point_dims[0],
+                    m_point_dims[1],
+                    m_point_dims[2]};
+    if(m_dims == 2)
+    {
+      mesh_logical_index_2d(logical_idx, vert_id, pdims);
+    }
+    else
+    {
+      mesh_logical_index_3d(logical_idx, vert_id, pdims);
+    }
+
+    vert[0] = static_cast(m_coords_x[logical_idx[0]]);
+    vert[1] = static_cast(m_coords_y[logical_idx[1]]);
+    if(m_dims == 3)
+    {
+      vert[2] = static_cast(m_coords_z[logical_idx[2]]);
+    }
+    else
+    {
+      vert[2] = 0.;
+    }
+  }
+
+};
+
+//---------------------------------------------------------------------------//
+// UnstructuredMesh
+//---------------------------------------------------------------------------//
+template
+struct UnstructuredMesh
+{
+
+  DeviceAccessor m_coords_x;
+  DeviceAccessor m_coords_y;
+  DeviceAccessor m_coords_z;
+  DeviceAccessor m_conn;
+  const int m_shape_type;
+  const int m_dims;
+  const int m_num_indices;
+  const int m_num_cells;
+  const int m_num_points;
+
+  //==---------------------------------------------------------------------==//
+  UnstructuredMesh() = delete;
+
+  //==---------------------------------------------------------------------==//
+  UnstructuredMesh(const std::string mem_space,
+                   MCArray &coords,
+                   MCArray &conn,
+                   const int shape_type,
+                   const int dims)
+    : m_coords_x(coords.accessor(mem_space, "x")),
+      m_coords_y(coords.accessor(mem_space, "y")),
+      m_coords_z(dims == 3 ? coords.accessor(mem_space, "z") :
+                             // just use a dummy in this case
+                             coords.accessor(mem_space, "x")),
+      m_conn(conn.accessor(mem_space)),
+      m_shape_type(shape_type),
+      m_dims(dims),
+      m_num_indices(num_indices(shape_type)),
+      m_num_cells(m_conn.m_size / m_num_indices),
+      m_num_points(m_coords_x.m_size)
+
+  {
+  }
+
+  //==---------------------------------------------------------------------==//
+  // TODO: some sort of error checking mechanism
+  ASCENT_EXEC
+  void cell_indices(const int cell_index, int indices[8]) const
+  {
+    const int offset = cell_index * m_num_indices;
+    for(int i = 0; i < m_num_indices; ++i)
+    {
+      indices[i] = static_cast(m_conn[offset + i]);
+    }
+  }
+
+  //==---------------------------------------------------------------------==//
+  ASCENT_EXEC
+  void vertex(const int vert_id, double vert[3]) const
+  {
+    vert[0] = static_cast(m_coords_x[vert_id]);
+    vert[1] = static_cast(m_coords_y[vert_id]);
+    if(m_dims == 3)
+    {
+      vert[2] = static_cast(m_coords_z[vert_id]);
+    }
+    else
+    {
+      vert[2] = 0.;
+    }
+  }
+
+};
+
+
+
+//-----------------------------------------------------------------------------
+};
+//-----------------------------------------------------------------------------
+// -- end ascent::runtime::expressions--
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+};
+//-----------------------------------------------------------------------------
+// -- end ascent::runtime --
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+};
+//-----------------------------------------------------------------------------
+// -- end ascent:: --
+//-----------------------------------------------------------------------------
+
+#endif
diff --git a/src/libs/ascent/runtimes/expressions/ascent_conduit_reductions.cpp b/src/libs/ascent/runtimes/expressions/ascent_blueprint_device_reductions.cpp
similarity index 53%
rename from src/libs/ascent/runtimes/expressions/ascent_conduit_reductions.cpp
rename to src/libs/ascent/runtimes/expressions/ascent_blueprint_device_reductions.cpp
index c55cf77e2..7c2984bc1 100644
--- a/src/libs/ascent/runtimes/expressions/ascent_conduit_reductions.cpp
+++ b/src/libs/ascent/runtimes/expressions/ascent_blueprint_device_reductions.cpp
@@ -7,13 +7,14 @@
 
 //-----------------------------------------------------------------------------
 ///
-/// file: ascent_conduit_reductions.cpp
+/// file: ascent_blueprint_device_reductions.cpp
 ///
 //-----------------------------------------------------------------------------
 
-#include "ascent_conduit_reductions.hpp"
+#include "ascent_blueprint_device_reductions.hpp"
 #include "ascent_memory_manager.hpp"
-#include "ascent_memory_interface.hpp"
+#include "ascent_blueprint_device_dispatch.hpp"
+#include "ascent_blueprint_device_mesh_objects.hpp"
 #include "ascent_array.hpp"
 #include "ascent_execution_policies.hpp"
 #include "ascent_execution_manager.hpp"
@@ -53,356 +54,16 @@ namespace runtime
 namespace expressions
 {
 
+//-----------------------------------------------------------------------------
+// -- begin ascent::runtime::expressions::detail --
+//-----------------------------------------------------------------------------
 namespace detail
 {
 
-bool field_is_float32(const conduit::Node &field)
-{
-  const int children = field["values"].number_of_children();
-  if(children == 0)
-  {
-    return field["values"].dtype().is_float32();
-  }
-  else
-  {
-    // there has to be one or more children so ask the first
-    return field["values"].child(0).dtype().is_float32();
-  }
-}
-
-bool field_is_float64(const conduit::Node &field)
-{
-  const int children = field["values"].number_of_children();
-  if(children == 0)
-  {
-    return field["values"].dtype().is_float64();
-  }
-  else
-  {
-    // there has to be one or more children so ask the first
-    return field["values"].child(0).dtype().is_float64();
-  }
-}
-
-bool field_is_int32(const conduit::Node &field)
-{
-  const int children = field["values"].number_of_children();
-  if(children == 0)
-  {
-    return field["values"].dtype().is_int32();
-  }
-  else
-  {
-    // there has to be one or more children so ask the first
-    return field["values"].child(0).dtype().is_int32();
-  }
-}
-
-bool field_is_int64(const conduit::Node &field)
-{
-  const int children = field["values"].number_of_children();
-  if(children == 0)
-  {
-    return field["values"].dtype().is_int64();
-  }
-  else
-  {
-    // there has to be one or more children so ask the first
-    return field["values"].child(0).dtype().is_int64();
-  }
-}
-
-template
-conduit::Node dispatch_memory(const conduit::Node &field,
-                              std::string component,
-                              const Function &func,
-                              const Exec &exec)
-{
-  const std::string mem_space = Exec::memory_space;
-
-  conduit::Node res;
-  if(field_is_float32(field))
-  {
-    MemoryInterface farray(field);
-    MemoryAccessor accessor = farray.accessor(mem_space,component);
-    res = func(accessor, exec);
-  }
-  else if(field_is_float64(field))
-  {
-    MemoryInterface farray(field);
-    MemoryAccessor accessor = farray.accessor(mem_space,component);
-    res = func(accessor, exec);
-  }
-  else if(field_is_int32(field))
-  {
-    MemoryInterface farray(field);
-    MemoryAccessor accessor = farray.accessor(mem_space,component);
-    res = func(accessor, exec);
-  }
-  else if(field_is_int64(field))
-  {
-    MemoryInterface farray(field);
-    MemoryAccessor accessor = farray.accessor(mem_space,component);
-    res = func(accessor, exec);
-  }
-  else
-  {
-    ASCENT_ERROR("Type dispatch: unsupported array type "<<
-                  field.schema().to_string());
-  }
-  return res;
-}
-
-template
-conduit::Node
-exec_dispatch(const conduit::Node &field, std::string component, const Function &func)
-{
-
-  conduit::Node res;
-  const std::string exec_policy = ExecutionManager::execution_policy();
-  //std::cout<<"Exec policy "<
-conduit::Node
-field_dispatch(const conduit::Node &field, const Function &func)
-{
-  // check for single component scalar
-  int num_children = field["values"].number_of_children();
-  if(num_children > 1)
-  {
-    ASCENT_ERROR("Field Dispatch internal error: expected scalar array.");
-  }
-  conduit::Node res;
-
-  if(field_is_float32(field))
-  {
-    MemoryInterface farray(field);
-    res = func(farray.ptr_const(), farray.size(0));
-  }
-  else if(field_is_float64(field))
-  {
-    MemoryInterface farray(field);
-    res = func(farray.ptr_const(), farray.size(0));
-  }
-  else if(field_is_int32(field))
-  {
-    MemoryInterface farray(field);
-    res = func(farray.ptr_const(), farray.size(0));
-  }
-  else if(field_is_int64(field))
-  {
-    MemoryInterface farray(field);
-    res = func(farray.ptr_const(), farray.size(0));
-  }
-  else
-  {
-    ASCENT_ERROR("Type dispatch: unsupported array type "<<
-                  field.schema().to_string());
-  }
-  return res;
-}
-
-////////////////////////////////////////////////////////////////////////////////////
-
-// TODO THIS NEEDS TO BE RAJAFIED
-template
-conduit::Node
-type_dispatch(const conduit::Node &values0, const conduit::Node &values1, const bool is_list, const Function &func)
-{
-  // check for single component scalar
-  int num_children0 = values0.number_of_children();
-  int num_children1 = values1.number_of_children();
-  if(num_children0 > 1 || num_children1 > 1)
-  {
-    ASCENT_ERROR("Internal error: expected scalar array.");
-  }
-  const conduit::Node &vals0 = num_children0 == 0 ? values0 : values0.child(0);
-  const conduit::Node &vals1 = num_children1 == 0 ? values1 : values1.child(0);
-
-  conduit::Node res;
-  const int num_vals0 = vals0.dtype().number_of_elements();
-  const int num_vals1 = vals1.dtype().number_of_elements();
-
-  if(vals0.dtype().is_float32())
-  {
-    const conduit::float32 *ptr0 =  vals0.as_float32_ptr();
-    if(vals1.dtype().is_float32()) {
-      const conduit::float32 *ptr1 =  vals1.as_float32_ptr();
-      res = func(ptr0, ptr1, num_vals0, num_vals1);
-    }
-    else if(vals1.dtype().is_float64() || is_list) {
-      const conduit::float64 *ptr1 =  vals1.as_float64_ptr();
-      res = func(ptr0, ptr1, num_vals0, num_vals1);
-    }
-    else if(vals1.dtype().is_int32()) {
-      const conduit::int32 *ptr1 =  vals1.as_int32_ptr();
-      res = func(ptr0, ptr1, num_vals0, num_vals1);
-    }
-    else if(vals1.dtype().is_int64()) {
-      const conduit::int64 *ptr1 =  vals1.as_int64_ptr();
-      res = func(ptr0, ptr1, num_vals0, num_vals1);
-    }
-    else {
-      ASCENT_ERROR("Type dispatch: unsupported array type for array1: "<< values1.schema().to_string());
-    }
-  }
-  else if(vals0.dtype().is_float64())
-  {
-    const conduit::float64 *ptr0 =  vals0.as_float64_ptr();
-    if(vals1.dtype().is_float32()) {
-      const conduit::float32 *ptr1 =  vals1.as_float32_ptr();
-      res = func(ptr0, ptr1, num_vals0, num_vals1);
-    }
-    else if(vals1.dtype().is_float64() || is_list) {
-      const conduit::float64 *ptr1 =  vals1.as_float64_ptr();
-      res = func(ptr0, ptr1, num_vals0, num_vals1);
-    }
-    else if(vals1.dtype().is_int32()) {
-      const conduit::int32 *ptr1 =  vals1.as_int32_ptr();
-      res = func(ptr0, ptr1, num_vals0, num_vals1);
-    }
-    else if(vals1.dtype().is_int64()) {
-      const conduit::int64 *ptr1 =  vals1.as_int64_ptr();
-      res = func(ptr0, ptr1, num_vals0, num_vals1);
-    }
-    else {
-      ASCENT_ERROR("Type dispatch: unsupported array type for array1: "<< values1.schema().to_string());
-    }
-  }
-  else if(vals0.dtype().is_int32())
-  {
-    const conduit::int32 *ptr0 =  vals0.as_int32_ptr();
-    if(vals1.dtype().is_float32()) {
-      const conduit::float32 *ptr1 =  vals1.as_float32_ptr();
-      res = func(ptr0, ptr1, num_vals0, num_vals1);
-    }
-    else if(vals1.dtype().is_float64() || is_list) {
-      const conduit::float64 *ptr1 =  vals1.as_float64_ptr();
-      res = func(ptr0, ptr1, num_vals0, num_vals1);
-    }
-    else if(vals1.dtype().is_int32()) {
-      const conduit::int32 *ptr1 =  vals1.as_int32_ptr();
-      res = func(ptr0, ptr1, num_vals0, num_vals1);
-    }
-    else if(vals1.dtype().is_int64()) {
-      const conduit::int64 *ptr1 =  vals1.as_int64_ptr();
-      res = func(ptr0, ptr1, num_vals0, num_vals1);
-    }
-    else {
-      ASCENT_ERROR("Type dispatch: unsupported array type for array1: "<< values1.schema().to_string());
-    }
-  }
-  else if(vals0.dtype().is_int64())
-  {
-    const conduit::int64 *ptr0 =  vals0.as_int64_ptr();
-    if(vals1.dtype().is_float32()) {
-      const conduit::float32 *ptr1 =  vals1.as_float32_ptr();
-      res = func(ptr0, ptr1, num_vals0, num_vals1);
-    }
-    else if(vals1.dtype().is_float64() || is_list) {
-      const conduit::float64 *ptr1 =  vals1.as_float64_ptr();
-      res = func(ptr0, ptr1, num_vals0, num_vals1);
-    }
-    else if(vals1.dtype().is_int32()) {
-      const conduit::int32 *ptr1 =  vals1.as_int32_ptr();
-      res = func(ptr0, ptr1, num_vals0, num_vals1);
-    }
-    else if(vals1.dtype().is_int64()) {
-      const conduit::int64 *ptr1 =  vals1.as_int64_ptr();
-      res = func(ptr0, ptr1, num_vals0, num_vals1);
-    }
-    else {
-      ASCENT_ERROR("Type dispatch: unsupported array type for array1: "<< values1.schema().to_string());
-    }
-  }
-  else
-  {
-    ASCENT_ERROR("Type dispatch: unsupported array type for array0: "<<
-                  values0.schema().to_string());
-  }
-  return res;
-}
-
-// TODO THIS NEEDS TO BE RAJAFIED
-struct GradientFunctor
-{
-  template
-  conduit::Node operator()(const T* y_values, const T2* dx_values, const int &size_y_values, const int &size_dx_values) const
-  {
-    bool single_dx = (size_dx_values == 1);
-
-    if(!single_dx && size_dx_values < (size_y_values-1)) {
-        ASCENT_ERROR("Must either supply a single uniform delta_x value, or provide at least len(y_values)-1 delta_x values (indicating the delta_x from each y value to the next).");                
-    }
-
-    int num_gradients = size_y_values-1;
-    double *gradients = new double[num_gradients];
-
-    if(single_dx) {    
-    #ifdef ASCENT_OPENMP_ENABLED
-        #pragma omp parallel for
-    #endif
-        for(int v = 0; v < num_gradients; ++v)
-        {
-            gradients[v] = ( (y_values[v+1] - y_values[v]) / (double) *dx_values);
-        }
-    }
-    else {
-    #ifdef ASCENT_OPENMP_ENABLED
-        #pragma omp parallel for
-    #endif
-        for(int v = 0; v < num_gradients; ++v)
-        {
-            gradients[v] = ( (y_values[v+1] - y_values[v]) / (double) dx_values[v]);
-        }
-    }
-
-    conduit::Node res;
-    res["value"].set(gradients, num_gradients);
-    res["count"] = num_gradients;
-    return res;
-  }
-};
-
-////////////////////////////////////////////////////////////////////////////////////
-
 struct MaxFunctor
 {
   template
-  conduit::Node operator()(const MemoryAccessor accessor,
+  conduit::Node operator()(const DeviceAccessor accessor,
                            const Exec &) const
   {
     T identity = std::numeric_limits::lowest();
@@ -426,11 +87,10 @@ struct MaxFunctor
   }
 };
 
-
 struct MinFunctor
 {
   template
-  conduit::Node operator()(const MemoryAccessor accessor,
+  conduit::Node operator()(const DeviceAccessor accessor,
                            const Exec &) const
   {
     T identity = std::numeric_limits::max();
@@ -458,7 +118,7 @@ struct MinFunctor
 struct SumFunctor
 {
   template
-  conduit::Node operator()(const MemoryAccessor accessor,
+  conduit::Node operator()(const DeviceAccessor accessor,
                            const Exec &) const
   {
     const int size = accessor.m_size;
@@ -484,7 +144,7 @@ struct SumFunctor
 struct NanFunctor
 {
   template
-  conduit::Node operator()(const MemoryAccessor accessor,
+  conduit::Node operator()(const DeviceAccessor accessor,
                            const Exec &) const
   {
     const int size = accessor.m_size;
@@ -517,7 +177,7 @@ struct InfFunctor
 {
   // default template for non floating point types
   template
-  conduit::Node operator()(const MemoryAccessor accessor, Exec &) const
+  conduit::Node operator()(const DeviceAccessor accessor, Exec &) const
   {
     const int size = accessor.m_size;
     T sum = 0;
@@ -528,7 +188,7 @@ struct InfFunctor
   }
 
   template
-  conduit::Node impl(const MemoryAccessor accessor, Exec &) const
+  conduit::Node impl(const DeviceAccessor accessor, Exec &) const
   {
     using for_policy = typename Exec::for_policy;
     using reduce_policy = typename Exec::reduce_policy;
@@ -556,13 +216,13 @@ struct InfFunctor
   }
 
   template
-  conduit::Node operator()(const MemoryAccessor accessor, Exec &exec) const
+  conduit::Node operator()(const DeviceAccessor accessor, Exec &exec) const
   {
     return impl(accessor, exec);
   }
 
   template
-  conduit::Node operator()(const MemoryAccessor accessor, Exec &exec) const
+  conduit::Node operator()(const DeviceAccessor accessor, Exec &exec) const
   {
     return impl(accessor, exec);
   }
@@ -582,7 +242,7 @@ struct HistogramFunctor
   {}
 
   template
-  conduit::Node operator()(const MemoryAccessor accessor,
+  conduit::Node operator()(const DeviceAccessor accessor,
                            const Exec &) const
   {
     const int size = accessor.m_size;
@@ -628,6 +288,51 @@ struct HistogramFunctor
     return res;
   }
 };
+
+////////////////////////////////////////////////////////////////////////////////////
+// TODO THIS NEEDS TO BE RAJAFIED
+struct HistoryGradientRangeFunctor
+{
+  template
+  conduit::Node operator()(const T* y_values, const T2* dx_values, const int &size_y_values, const int &size_dx_values) const
+  {
+    bool single_dx = (size_dx_values == 1);
+
+    if(!single_dx && size_dx_values < (size_y_values-1)) {
+        ASCENT_ERROR("Must either supply a single uniform delta_x value, or provide at least len(y_values)-1 delta_x values (indicating the delta_x from each y value to the next).");
+    }
+
+    int num_gradients = size_y_values-1;
+    double *gradients = new double[num_gradients];
+
+    if(single_dx) {    
+    #ifdef ASCENT_OPENMP_ENABLED
+        #pragma omp parallel for
+    #endif
+        for(int v = 0; v < num_gradients; ++v)
+        {
+            gradients[v] = ( (y_values[v+1] - y_values[v]) / (double) *dx_values);
+        }
+    }
+    else {
+    #ifdef ASCENT_OPENMP_ENABLED
+        #pragma omp parallel for
+    #endif
+        for(int v = 0; v < num_gradients; ++v)
+        {
+            gradients[v] = ( (y_values[v+1] - y_values[v]) / (double) dx_values[v]);
+        }
+    }
+
+    conduit::Node res;
+    res["value"].set(gradients, num_gradients);
+    res["count"] = num_gradients;
+    return res;
+  }
+};
+////////////////////////////////////////////////////////////////////////////////////
+
+
 //-----------------------------------------------------------------------------
 };
 //-----------------------------------------------------------------------------
@@ -635,45 +340,42 @@ struct HistogramFunctor
 //-----------------------------------------------------------------------------
 
 conduit::Node
-
-
-array_gradient(const conduit::Node &y_values,
-               const conduit::Node &dx_values,
-               const bool is_list)
+history_gradient_range(const conduit::Node &y_values,
+                       const conduit::Node &dx_values)
 {
   // TODO THIS NEEDS TO BE PORTED TO RAJA ?
-  return detail::type_dispatch(y_values, dx_values, is_list, detail::GradientFunctor());
+  return exec_dispatch_two_leaves(y_values, dx_values, detail::HistoryGradientRangeFunctor());
 }
 
 
 conduit::Node
 field_reduction_max(const conduit::Node &field, const std::string &component)
 {
-  return detail::exec_dispatch(field, component, detail::MaxFunctor());
+  return exec_dispatch_mcarray_component(field["values"], component, detail::MaxFunctor());
 }
 
 conduit::Node
 field_reduction_min(const conduit::Node &field, const std::string &component)
 {
-  return detail::exec_dispatch(field, component, detail::MinFunctor());
+  return exec_dispatch_mcarray_component(field["values"], component, detail::MinFunctor());
 }
 
 conduit::Node
 field_reduction_sum(const conduit::Node &field, const std::string &component)
 {
-  return detail::exec_dispatch(field, component, detail::SumFunctor());
+  return exec_dispatch_mcarray_component(field["values"], component, detail::SumFunctor());
 }
 
 conduit::Node
 field_reduction_nan_count(const conduit::Node &field, const std::string &component)
 {
-  return detail::exec_dispatch(field, component, detail::NanFunctor());
+  return exec_dispatch_mcarray_component(field["values"], component, detail::NanFunctor());
 }
 
 conduit::Node
 field_reduction_inf_count(const conduit::Node &field, const std::string &component)
 {
-  return detail::exec_dispatch(field, component, detail::InfFunctor());
+  return exec_dispatch_mcarray_component(field["values"], component, detail::InfFunctor());
 }
 
 conduit::Node
@@ -684,7 +386,7 @@ field_reduction_histogram(const conduit::Node &field,
                           const std::string &component)
 {
   detail::HistogramFunctor histogram(min_value, max_value, num_bins);
-  return detail::exec_dispatch(field, component, histogram);
+  return exec_dispatch_mcarray_component(field["values"], component, histogram);
 }
 
 conduit::Node
diff --git a/src/libs/ascent/runtimes/expressions/ascent_conduit_reductions.hpp b/src/libs/ascent/runtimes/expressions/ascent_blueprint_device_reductions.hpp
similarity index 92%
rename from src/libs/ascent/runtimes/expressions/ascent_conduit_reductions.hpp
rename to src/libs/ascent/runtimes/expressions/ascent_blueprint_device_reductions.hpp
index 13883089b..f3ce1ebbc 100644
--- a/src/libs/ascent/runtimes/expressions/ascent_conduit_reductions.hpp
+++ b/src/libs/ascent/runtimes/expressions/ascent_blueprint_device_reductions.hpp
@@ -7,12 +7,12 @@
 
 //-----------------------------------------------------------------------------
 ///
-/// file: ascent_conduit_reductions.hpp
+/// file: ascent_blueprint_device_reductions.hpp
 ///
 //-----------------------------------------------------------------------------
 
-#ifndef ASCENT_CONDUIT_REDUCTIONS
-#define ASCENT_CONDUIT_REDUCTIONS
+#ifndef ASCENT_BLUEPRINT_DEVICE_REDUCTIONS_HPP
+#define ASCENT_BLUEPRINT_DEVICE_REDUCTIONS_HPP
 
 #include 
 #include 
@@ -37,9 +37,8 @@ namespace expressions
 {
 
 
-conduit::Node ASCENT_API array_gradient(const conduit::Node &y_values,
-                             const conduit::Node &dx_values,
-                             bool is_list = false);
+conduit::Node ASCENT_API history_gradient_range(const conduit::Node &y_values,
+                                                const conduit::Node &dx_values);
 
 conduit::Node ASCENT_API field_reduction_max(const conduit::Node &field,
                                   const std::string &component = "");
diff --git a/src/libs/ascent/runtimes/expressions/ascent_blueprint_type_utils.cpp b/src/libs/ascent/runtimes/expressions/ascent_blueprint_type_utils.cpp
new file mode 100644
index 000000000..96619908d
--- /dev/null
+++ b/src/libs/ascent/runtimes/expressions/ascent_blueprint_type_utils.cpp
@@ -0,0 +1,164 @@
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+// Copyright (c) Lawrence Livermore National Security, LLC and other Ascent
+// Project developers. See top-level LICENSE AND COPYRIGHT files for dates and
+// other details. No copyright assignment is required to contribute to Ascent.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+
+#include "ascent_blueprint_type_utils.hpp"
+
+//-----------------------------------------------------------------------------
+// -- begin ascent:: --
+//-----------------------------------------------------------------------------
+namespace ascent
+{
+
+//-----------------------------------------------------------------------------
+// -- begin ascent::runtime --
+//-----------------------------------------------------------------------------
+namespace runtime
+{
+
+//-----------------------------------------------------------------------------
+// -- begin ascent::runtime::expressions--
+//-----------------------------------------------------------------------------
+namespace expressions
+{
+
+//-----------------------------------------------------------------------------
+bool mcarray_is_float32(const conduit::Node &node)
+{
+  const int children = node.number_of_children();
+  if(children == 0)
+  {
+    return node.dtype().is_float32();
+  }
+  else
+  {
+    // there has to be one or more children so ask the first
+    return node.child(0).dtype().is_float32();
+  }
+}
+
+//-----------------------------------------------------------------------------
+bool mcarray_is_float64(const conduit::Node &node)
+{
+  const int children = node.number_of_children();
+  if(children == 0)
+  {
+    return node.dtype().is_float64();
+  }
+  else
+  {
+    // there has to be one or more children so ask the first
+    return node.child(0).dtype().is_float64();
+  }
+}
+
+//-----------------------------------------------------------------------------
+bool mcarray_is_int32(const conduit::Node &node)
+{
+  const int children = node.number_of_children();
+  if(children == 0)
+  {
+    return node.dtype().is_int32();
+  }
+  else
+  {
+    // there has to be one or more children so ask the first
+    return node.child(0).dtype().is_int32();
+  }
+}
+
+//-----------------------------------------------------------------------------
+bool mcarray_is_int64(const conduit::Node &node)
+{
+  const int children = node.number_of_children();
+  if(children == 0)
+  {
+    return node.dtype().is_int64();
+  }
+  else
+  {
+    // there has to be one or more children so ask the first
+    return node.child(0).dtype().is_int64();
+  }
+}
+
+//-----------------------------------------------------------------------------
+bool field_is_float32(const conduit::Node &field)
+{
+  const int children = field["values"].number_of_children();
+  if(children == 0)
+  {
+    return field["values"].dtype().is_float32();
+  }
+  else
+  {
+    // there has to be one or more children so ask the first
+    return field["values"].child(0).dtype().is_float32();
+  }
+}
+
+//-----------------------------------------------------------------------------
+bool field_is_float64(const conduit::Node &field)
+{
+  const int children = field["values"].number_of_children();
+  if(children == 0)
+  {
+    return field["values"].dtype().is_float64();
+  }
+  else
+  {
+    // there has to be one or more children so ask the first
+    return field["values"].child(0).dtype().is_float64();
+  }
+}
+
+//-----------------------------------------------------------------------------
+bool field_is_int32(const conduit::Node &field)
+{
+  const int children = field["values"].number_of_children();
+  if(children == 0)
+  {
+    return field["values"].dtype().is_int32();
+  }
+  else
+  {
+    // there has to be one or more children so ask the first
+    return field["values"].child(0).dtype().is_int32();
+  }
+}
+
+//-----------------------------------------------------------------------------
+bool field_is_int64(const conduit::Node &field)
+{
+  const int children = field["values"].number_of_children();
+  if(children == 0)
+  {
+    return field["values"].dtype().is_int64();
+  }
+  else
+  {
+    // there has to be one or more children so ask the first
+    return field["values"].child(0).dtype().is_int64();
+  }
+}
+
+//-----------------------------------------------------------------------------
+};
+//-----------------------------------------------------------------------------
+// -- end ascent::runtime::expressions--
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+};
+//-----------------------------------------------------------------------------
+// -- end ascent::runtime --
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+};
+//-----------------------------------------------------------------------------
+// -- end ascent:: --
+//-----------------------------------------------------------------------------
+
diff --git a/src/libs/ascent/runtimes/expressions/ascent_blueprint_type_utils.hpp b/src/libs/ascent/runtimes/expressions/ascent_blueprint_type_utils.hpp
new file mode 100644
index 000000000..565df5011
--- /dev/null
+++ b/src/libs/ascent/runtimes/expressions/ascent_blueprint_type_utils.hpp
@@ -0,0 +1,104 @@
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+// Copyright (c) Lawrence Livermore National Security, LLC and other Ascent
+// Project developers. See top-level LICENSE AND COPYRIGHT files for dates and
+// other details. No copyright assignment is required to contribute to Ascent.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+
+#ifndef ASCENT_BLUEPRINT_TYPE_UTILS
+#define ASCENT_BLUEPRINT_TYPE_UTILS
+
+#include 
+#include 
+
+//-----------------------------------------------------------------------------
+// -- begin ascent:: --
+//-----------------------------------------------------------------------------
+namespace ascent
+{
+
+//-----------------------------------------------------------------------------
+// -- begin ascent::runtime --
+//-----------------------------------------------------------------------------
+namespace runtime
+{
+
+//-----------------------------------------------------------------------------
+// -- begin ascent::runtime::expressions--
+//-----------------------------------------------------------------------------
+namespace expressions
+{
+
+//-----------------------------------------------------------------------------
+static inline int cell_shape(const std::string &shape_type)
+{
+  int shape_id = 0;
+  if(shape_type == "tri")
+  {
+      shape_id = 5;
+  }
+  else if(shape_type == "quad")
+  {
+      shape_id = 9;
+  }
+  else if(shape_type == "tet")
+  {
+      shape_id = 10;
+  }
+  else if(shape_type == "hex")
+  {
+      shape_id = 12;
+  }
+  else if(shape_type == "point")
+  {
+      shape_id = 1;
+  }
+  else if(shape_type == "line")
+  {
+      shape_id = 3;
+  }
+  else
+  {
+      ASCENT_ERROR("Unsupported cell type " << shape_type);
+  }
+
+  return shape_id;
+}
+
+//-----------------------------------------------------------------------------
+ASCENT_API bool mcarray_is_float32(const conduit::Node &node);
+//-----------------------------------------------------------------------------
+ASCENT_API bool mcarray_is_float64(const conduit::Node &node);
+//-----------------------------------------------------------------------------
+ASCENT_API bool mcarray_is_int32(const conduit::Node &node);
+//-----------------------------------------------------------------------------
+ASCENT_API bool mcarray_is_int64(const conduit::Node &node);
+
+
+//-----------------------------------------------------------------------------
+ASCENT_API bool field_is_float32(const conduit::Node &field);
+//-----------------------------------------------------------------------------
+ASCENT_API bool field_is_float64(const conduit::Node &field);
+//-----------------------------------------------------------------------------
+ASCENT_API bool field_is_int32(const conduit::Node &field);
+//-----------------------------------------------------------------------------
+ASCENT_API bool field_is_int64(const conduit::Node &field);
+
+//-----------------------------------------------------------------------------
+};
+//-----------------------------------------------------------------------------
+// -- end ascent::runtime::expressions--
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+};
+//-----------------------------------------------------------------------------
+// -- end ascent::runtime --
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+};
+//-----------------------------------------------------------------------------
+// -- end ascent:: --
+//-----------------------------------------------------------------------------
+
+#endif
diff --git a/src/libs/ascent/runtimes/expressions/ascent_data_binning.cpp b/src/libs/ascent/runtimes/expressions/ascent_data_binning.cpp
index 0ee103637..3b2be4417 100644
--- a/src/libs/ascent/runtimes/expressions/ascent_data_binning.cpp
+++ b/src/libs/ascent/runtimes/expressions/ascent_data_binning.cpp
@@ -1,7 +1,7 @@
 #include 
 #include 
 #include 
-#include 
+#include 
 #include 
 
 #if defined(ASCENT_RAJA_ENABLED)
@@ -503,8 +503,8 @@ Array cast_to_float64(conduit::Node &field, const std::string component)
   const std::string mem_space = Exec::memory_space;
 
 
-  MemoryInterface farray(field);
-  MemoryAccessor accessor = farray.accessor(mem_space,component);
+  MCArray farray(field["values"]);
+  DeviceAccessor accessor = farray.accessor(mem_space,component);
   Array res;
   const int size = accessor.m_size;
   res.resize(size);
@@ -1085,7 +1085,7 @@ conduit::Node data_binning(conduit::Node &dataset,
                                     component,
                                     reduction_var);
 
-  exec_dispatch(bindexer);
+  exec_dispatch_function(bindexer);
 
   // we now have the all of the bin setup, all we have to
   // do now is the reduction
@@ -1099,7 +1099,7 @@ conduit::Node data_binning(conduit::Node &dataset,
   // return the bindexes so we can paint later
   bindexes = bindexer.m_bindexes;
 
-  exec_dispatch(binner);
+  exec_dispatch_function(binner);
   //std::cout<<"DONE BINinng\n";
   // mpi exchange
   detail::exchange_bins(bins, reduction_op);
@@ -1113,7 +1113,7 @@ conduit::Node data_binning(conduit::Node &dataset,
                                     reduction_op,
                                     empty_bin_val);
 
-  exec_dispatch(banana);
+  exec_dispatch_function(banana);
 
   res["association"] = assoc_str;
   //std::cout<<"res "<
-void
-dispatch_memory_mesh(const conduit::Node &n_coords,
-                     const conduit::Node &n_topo,
-                     Function &func,
-                     const Exec &exec)
-{
-  const std::string mem_space = Exec::memory_space;
-  const std::string mesh_type = n_topo["type"].as_string();
-
-  if(mesh_type == "unstructured")
-  {
-    const int shape_type = cell_shape(n_topo["elements/shape"].as_string());
-    const int dims = n_coords["values"].number_of_children();
-
-    if(dims < 2 || dims > 3)
-    {
-      std::cout<<"Bad dims "<(n_coords["values/x"]))
-    {
-      MemoryInterface coords(n_coords);
-
-      if(is_conduit_type(n_topo[conn_path]))
-      {
-        MemoryInterface conn(n_topo, conn_path);
-        UnstructuredMesh mesh(mem_space,
-                                                               coords,
-                                                               conn,
-                                                               shape_type,
-                                                               dims);
-        func(mesh,exec);
-      }
-      else if(is_conduit_type(n_topo[conn_path]))
-      {
-        MemoryInterface conn(n_topo, conn_path);
-        UnstructuredMesh mesh(mem_space,
-                                                               coords,
-                                                               conn,
-                                                               shape_type,
-                                                               dims);
-        func(mesh,exec);
-      }
-      else
-      {
-        std::cout<<"bad topo "<(n_coords["values/x"]))
-    {
-      MemoryInterface coords(n_coords);
-
-      if(is_conduit_type(n_topo[conn_path]))
-      {
-        MemoryInterface conn(n_topo, conn_path);
-        UnstructuredMesh mesh(mem_space,
-                                                               coords,
-                                                               conn,
-                                                               shape_type,
-                                                               dims);
-        func(mesh,exec);
-      }
-      else if(is_conduit_type(n_topo[conn_path]))
-      {
-        MemoryInterface conn(n_topo, conn_path);
-        UnstructuredMesh mesh(mem_space,
-                                                               coords,
-                                                               conn,
-                                                               shape_type,
-                                                               dims);
-        func(mesh,exec);
-      }
-      else
-      {
-        std::cout<<"bad topo "< 3)
-    {
-      std::cout<<"Bad dims "<(n_coords["values/x"]))
-    {
-      MemoryInterface coords(n_coords);
-      RectilinearMesh mesh(mem_space,
-                                             coords,
-                                             dims);
-      func(mesh,exec);
-    }
-    else if(is_conduit_type(n_coords["values/x"]))
-    {
-      MemoryInterface coords(n_coords);
-      RectilinearMesh mesh(mem_space,
-                                             coords,
-                                             dims);
-      func(mesh,exec);
-    }
-    else
-    {
-      std::cout<<"Bad coordinates type rectilinear\n";
-    }
-  }
-  else if(mesh_type == "structured")
-  {
-    const int dims = n_coords["values"].number_of_children();
-    if(dims < 2 || dims > 3)
-    {
-      std::cout<<"Bad dims "<(n_coords["values/x"]))
-    {
-      MemoryInterface coords(n_coords);
-      StructuredMesh mesh(mem_space,
-                                            coords,
-                                            dims,
-                                            point_dims);
-      func(mesh,exec);
-    }
-    else if(is_conduit_type(n_coords["values/x"]))
-    {
-      MemoryInterface coords(n_coords);
-      StructuredMesh mesh(mem_space,
-                                            coords,
-                                            dims,
-                                            point_dims);
-      func(mesh,exec);
-    }
-    else
-    {
-      std::cout<<"Bad coordinates type structured\n";
-    }
-  }
-  else
-  {
-    std::cout<<"mesh type not implemented:  "<
-void
-exec_dispatch_mesh(const conduit::Node &n_coords,
-                   const conduit::Node &n_topo,
-                   Function &func)
-{
-
-  const std::string exec_policy = ExecutionManager::execution_policy();
-
-  //std::cout<<"Mesh Exec policy "<
-void
-exec_dispatch_array(Array &array, Function &func)
-{
-  const std::string exec_policy = ExecutionManager::execution_policy();
-
-  //std::cout<<"Array Exec policy "<
-void
-exec_dispatch(Function &func)
-{
-  const std::string exec_policy = ExecutionManager::execution_policy();
-
-  //std::cout<<"Exec only policy "<
 #include 
@@ -261,868 +261,798 @@ logic_op(const bool lhs, const bool rhs, const std::string &op)
   return res;
 }
 
-} // namespace detail
-
-void resolve_symbol_result(flow::Graph &graph,
-                           const conduit::Node *output,
-                           const std::string filter_name)
-{
-  conduit::Node *symbol_table =
-    graph.workspace().registry().fetch("symbol_table");
-  const int num_symbols = symbol_table->number_of_children();
-  for(int i = 0; i < num_symbols; ++i)
-  {
-    conduit::Node &symbol = symbol_table->child(i);
-    if(symbol["filter_name"].as_string() == filter_name)
-    {
-      symbol["value"] = output->fetch("value");
-      break;
-    }
-  }
-}
-//-----------------------------------------------------------------------------
-NullArg::NullArg() : Filter()
-{
-  // empty
-}
-
-//-----------------------------------------------------------------------------
-NullArg::~NullArg()
-{
-  // empty
-}
-
-//-----------------------------------------------------------------------------
-void
-NullArg::declare_interface(Node &i)
-{
-  i["type_name"] = "null_arg";
-  i["port_names"] = DataType::empty();
-  i["output_port"] = "true";
-}
-
-//-----------------------------------------------------------------------------
-bool
-NullArg::verify_params(const conduit::Node ¶ms, conduit::Node &info)
-{
-  info.reset();
-  bool res = true;
-  return res;
-}
-
-//-----------------------------------------------------------------------------
-void
-NullArg::execute()
-{
-  conduit::Node *output = new conduit::Node();
-  set_output(output);
-}
-
-//-----------------------------------------------------------------------------
-Identifier::Identifier() : Filter()
-{
-  // empty
-}
 
-//-----------------------------------------------------------------------------
-Identifier::~Identifier()
-{
-  // empty
-}
-
-//-----------------------------------------------------------------------------
-void
-Identifier::declare_interface(Node &i)
+void get_first_and_last_index(const string &operator_name,
+                              const conduit::Node &history,
+                              const int &entries,
+                              const conduit::Node *n_first_index,
+                              const conduit::Node *n_last_index,
+                              bool absolute,
+                              bool relative,
+                              bool simulation_time,
+                              bool simulation_cycle,
+                              int &first_index,
+                              int &last_index)
 {
-  i["type_name"] = "expr_identifier";
-  i["port_names"] = DataType::empty();
-  i["output_port"] = "true";
-}
 
-//-----------------------------------------------------------------------------
-bool
-Identifier::verify_params(const conduit::Node ¶ms, conduit::Node &info)
-{
-  info.reset();
-  bool res = true;
-  if(!params.has_path("value"))
+  if(absolute || relative)
   {
-    info["errors"].append() = "Missing required string parameter 'value'";
-    res = false;
-  }
-  return res;
-}
+    first_index = (*n_first_index)["value"].to_int32();
+    last_index = (*n_last_index)["value"].to_int32();
 
-//-----------------------------------------------------------------------------
-void
-Identifier::execute()
-{
-  conduit::Node *output = new conduit::Node();
-  std::string i_name = params()["value"].as_string();
+    if(first_index < 0 || last_index < 0)
+    {
+      ASCENT_ERROR(operator_name + ": the first index and last index must both be non-negative integers.");
+    }
 
-  const conduit::Node *const cache =
-      graph().workspace().registry().fetch("cache");
-  if(!cache->has_path(i_name))
-  {
-    ASCENT_ERROR("Unknown expression identifier: '" << i_name << "'");
-  }
+    if(first_index > last_index)
+    {
+      ASCENT_ERROR(operator_name + ": the first index must not be greater than the last index.");
+    }
 
-  const int entries = (*cache)[i_name].number_of_children();
-  if(entries < 1)
-  {
-    ASCENT_ERROR("Expression identifier: needs at least one entry");
+    if(relative) {
+      int relative_first_index = first_index;
+      int relative_last_index = last_index;
+      //when retrieving from m to n cycles ago, where m < n, n will have a lower history index than m
+      first_index = entries - relative_last_index - 1;
+      last_index = entries - relative_first_index - 1;
+      //clamp it to the first cycle
+      if(first_index < 0) {
+        first_index = 0;
+      }
+    }
+    else
+    {
+      //clamp it to the last cycle
+      if(last_index >= entries)
+      {
+        last_index = entries - 1;
+      }
+    }
   }
-  // grab the last one calculated so we have type info
-  (*output) = (*cache)[i_name].child(entries - 1);
-  // we need to keep the name to retrieve the chache
-  // if history is called.
-  (*output)["name"] = i_name;
-
-  resolve_symbol_result(graph(), output, this->name());
-  set_output(output);
-}
-
-//-----------------------------------------------------------------------------
-Boolean::Boolean() : Filter()
-{
-  // empty
-}
-
-//-----------------------------------------------------------------------------
-Boolean::~Boolean()
-{
-  // empty
-}
-
-//-----------------------------------------------------------------------------
-void
-Boolean::declare_interface(Node &i)
-{
-  i["type_name"] = "expr_bool";
-  i["port_names"] = DataType::empty();
-  i["output_port"] = "true";
-}
-
-//-----------------------------------------------------------------------------
-bool
-Boolean::verify_params(const conduit::Node ¶ms, conduit::Node &info)
-{
-  info.reset();
-  bool res = true;
-  if(!params.has_path("value"))
+  else if(simulation_time)
   {
-    info["errors"].append() = "Missing required numeric parameter 'value'";
-    res = false;
-  }
-  return res;
-}
-
-//-----------------------------------------------------------------------------
-void
-Boolean::execute()
-{
-  conduit::Node *output = new conduit::Node();
-  (*output)["value"] = params()["value"].to_uint8();
-  (*output)["type"] = "bool";
-  set_output(output);
-}
-
-//-----------------------------------------------------------------------------
-//-----------------------------------------------------------------------------
-Integer::Integer() : Filter()
-{
-  // empty
-}
-
-//-----------------------------------------------------------------------------
-Integer::~Integer()
-{
-  // empty
-}
-
-//-----------------------------------------------------------------------------
-
-void
-Integer::declare_interface(Node &i)
-{
-  i["type_name"] = "expr_integer";
-  i["port_names"] = DataType::empty();
-  i["output_port"] = "true";
-}
+    double first_time = (*n_first_index)["value"].to_float64();
+    double last_time = (*n_last_index)["value"].to_float64();
 
-//-----------------------------------------------------------------------------
-bool
-Integer::verify_params(const conduit::Node ¶ms, conduit::Node &info)
-{
-  info.reset();
-  bool res = true;
-  if(!params.has_path("value"))
-  {
-    info["errors"].append() = "Missing required numeric parameter 'value'";
-    res = false;
-  }
-  return res;
-}
+    // we might want window relative to the current time, and
+    // if that window is larger than what we currently have,
+    // clamp the values to 0
+    // Another possible solution to this is to specify relative times
+    first_time = std::max(0.0, first_time);
+    last_time = std::max(0.0, last_time);
 
-//-----------------------------------------------------------------------------
-void
-Integer::execute()
-{
-  conduit::Node *output = new conduit::Node();
-  (*output)["value"] = params()["value"].to_int32();
-  (*output)["type"] = "int";
-  set_output(output);
-}
+    if(first_time < 0 || last_time < 0)
+    {
+      ASCENT_ERROR(operator_name + ": the first_absolute_time and last_absolute_time "<<
+                   " must both be non-negative.");
+    }
 
-//-----------------------------------------------------------------------------
-Double::Double() : Filter()
-{
-  // empty
-}
+    if(first_time > last_time)
+    {
+      ASCENT_ERROR(operator_name +
+                   ": the first_absolute_time must not be "
+                   <<"greater than the last_absolute_time.");
+    }
 
-//-----------------------------------------------------------------------------
-Double::~Double()
-{
-  // empty
-}
+    string time_path = "time";
 
-//-----------------------------------------------------------------------------
-void
-Double::declare_interface(Node &i)
-{
-  i["type_name"] = "expr_double";
-  i["port_names"] = DataType::empty();
-  i["output_port"] = "true";
-}
+    double time;
+    last_index = 0;
+    for(int index = 0; index < entries; index++)
+    {
+      if(history.child(index).has_path(time_path))
+      {
+        time = history.child(index)[time_path].to_float64();
+      }
+      else
+      {
+        ASCENT_ERROR(operator_name << ": internal error. missing " << time_path
+                     << " value for time point in retrieval window (for the"
+                     <<" calculation at absolute index: " + to_string(index) + ")." );
+      }
 
-//-----------------------------------------------------------------------------
-bool
-Double::verify_params(const conduit::Node ¶ms, conduit::Node &info)
-{
-  info.reset();
-  bool res = true;
-  if(!params.has_path("value"))
-  {
-    info["errors"].append() = "Missing required numeric parameter 'value'";
-    res = false;
+      // I am not totally sure about this logic. Part of the problem is that we
+      // haven't fully specified what we want this behavior to be.
+      if(first_index == -1 && time >= first_time)
+      {
+        first_index = index;
+      }
+      if(time <= last_time)
+      {
+        last_index = index;
+      }
+      if(time > last_time)
+      {
+        break;
+      }
+    }
+    //clamp it to the last index to at least the first index
+    if(last_index < first_index)
+    {
+      last_index = first_index;
+    }
   }
-  return res;
-}
-
-//-----------------------------------------------------------------------------
-void
-Double::execute()
-{
-  conduit::Node *output = new conduit::Node();
-  (*output)["value"] = params()["value"].to_float64();
-  (*output)["type"] = "double";
-  set_output(output);
-}
-
-//-----------------------------------------------------------------------------
-String::String() : Filter()
-{
-  // empty
-}
-
-//-----------------------------------------------------------------------------
-String::~String()
-{
-  // empty
-}
-
-//-----------------------------------------------------------------------------
-void
-String::declare_interface(Node &i)
-{
-  i["type_name"] = "expr_string";
-  i["port_names"] = DataType::empty();
-  i["output_port"] = "true";
-}
-
-//-----------------------------------------------------------------------------
-bool
-String::verify_params(const conduit::Node ¶ms, conduit::Node &info)
-{
-  info.reset();
-  bool res = true;
-  if(!params.has_path("value"))
+  else if(simulation_cycle)
   {
-    info["errors"].append() = "Missing required string parameter 'value'";
-    res = false;
-  }
-  return res;
-}
-
-//-----------------------------------------------------------------------------
-void
-String::execute()
-{
-  conduit::Node *output = new conduit::Node();
-
-  (*output)["value"] = params()["value"].as_string();
-  (*output)["type"] = "string";
-  set_output(output);
-}
+    long long first_cycle = (*n_first_index)["value"].to_int64();
+    long long last_cycle = (*n_last_index)["value"].to_int64();
 
-//-----------------------------------------------------------------------------
-BinaryOp::BinaryOp() : Filter()
-{
-  // empty
-}
+    if(first_cycle < 0 || last_cycle < 0)
+    {
+      ASCENT_ERROR(operator_name + ": the first_absolute_cycle and last_absolute_cycle must both be non-negative.");
+    }
 
-//-----------------------------------------------------------------------------
-BinaryOp::~BinaryOp()
-{
-  // empty
-}
+    if(first_cycle > last_cycle)
+    {
+      ASCENT_ERROR(operator_name + ": the first_absolute_cycle must not be greater than the last_absolute_cycle.");
+    }
 
-//-----------------------------------------------------------------------------
-void
-BinaryOp::declare_interface(Node &i)
-{
-  i["type_name"] = "expr_binary_op";
-  i["port_names"].append() = "lhs";
-  i["port_names"].append() = "rhs";
-  i["output_port"] = "true";
-}
+    vector child_names = history.child_names();
+    if(child_names.size() != entries)
+    {
+      ASCENT_ERROR(operator_name + ": internal error. number of history entries: "
+                   <= first_cycle)
+      {
+        first_index = index;
+      }
+      else if(cycle > last_cycle)
+      {
+        last_index = index - 1;
+        break;
+      }
+    }
+    //clamp it to the last index
+    if(last_index == -1)
+    {
+      last_index = entries - 1;
+    }
   }
-  return res;
 }
-
-//-----------------------------------------------------------------------------
-void
-BinaryOp::execute()
+
+void set_values_from_history(const string &operator_name,
+                             const conduit::Node &history,
+                             int first_index,
+                             int return_size,
+                             bool return_history_index,
+                             bool return_simulation_time,
+                             bool return_simulation_cycle,
+                             conduit::Node *output)
 {
-  const conduit::Node *n_lhs = input("lhs");
-  const conduit::Node *n_rhs = input("rhs");
 
-  const conduit::Node &lhs = (*n_lhs)["value"];
-  const conduit::Node &rhs = (*n_rhs)["value"];
+  bool gradient = (return_history_index || return_simulation_time || return_simulation_cycle);
 
+  string value_path = "";
+  vector value_paths = {"value", "attrs/value/value"};
+  for(const string &path : value_paths)
+  {
+    if(history.child(first_index).has_path(path))
+    {
+      value_path = path;
+      break;
+    }
+  }
 
 
-  std::string op_str = params()["op_string"].as_string();
-  const std::string l_type = (*n_lhs)["type"].as_string();
-  const std::string r_type = (*n_rhs)["type"].as_string();
+  if(value_path.size() == 0)
+  {
+    ASCENT_ERROR(operator_name + " internal error. first index does not have one of the expected value paths");
+  }
 
-  conduit::Node *output = new conduit::Node();
-  std::stringstream msg;
+  conduit::DataType dtype = history.child(first_index)[value_path].dtype();
 
-  if(detail::is_math(op_str))
+  if(dtype.is_float32())
   {
-    if(detail::is_scalar(l_type) && detail::is_scalar(r_type))
+    float *array = new float[return_size];
+    for(int i = 0; i < return_size; ++i)
     {
-      // promote to double if at least one is a double
-      if(l_type == "double" || r_type == "double")
-      {
-        double d_rhs = rhs.to_float64();
-        double d_lhs = lhs.to_float64();
-        (*output)["value"] = detail::math_op(d_lhs, d_rhs, op_str);
-        (*output)["type"] = "double";
-      }
-      else
-      {
-        int i_rhs = rhs.to_int32();
-        int i_lhs = lhs.to_int32();
-        (*output)["value"] = detail::math_op(i_lhs, i_rhs, op_str);
-        (*output)["type"] = "int";
-      }
+      array[i] = history.child(first_index+i)[value_path].to_float32();
     }
-    else
+    (*output)["value"].set(array, return_size);
+    delete[] array;
+  }
+  else if(dtype.is_float64())
+  {
+    double *array = new double[return_size];
+    for(int i = 0; i < return_size; ++i)
     {
-      if(detail::is_scalar(l_type) != detail::is_scalar(r_type))
-      {
-        msg << "' " << l_type << " " << op_str << " " << r_type << "'";
-        ASCENT_ERROR(
-            "Mixed vector and scalar quantities not implemented / supported: "
-            << msg.str());
-      }
-
-      double res[3];
-      detail::vector_op(lhs.value(), rhs.value(), op_str, res);
-
-      (*output)["value"].set(res, 3);
-      (*output)["type"] = "vector";
+      array[i] = history.child(first_index+i)[value_path].to_float64();
     }
+    (*output)["value"].set(array, return_size);
+    delete[] array;
   }
-  else if(detail::is_logic(op_str))
+  else if(dtype.is_int32())
   {
-
-    bool b_lhs = lhs.to_uint8();
-    bool b_rhs = rhs.to_uint8();
-    (*output)["value"] = detail::logic_op(b_lhs, b_rhs, op_str);
-    (*output)["type"] = "bool";
+    int *array = new int[return_size];
+    for(int i = 0; i < return_size; ++i)
+    {
+      array[i] = history.child(first_index+i)[value_path].to_int32();
+    }
+    (*output)["value"].set(array, return_size);
+    delete[] array;
+  }
+  else if(dtype.is_int64())
+  {
+    long long *array = new long long[return_size];
+    for(int i = 0; i < return_size; ++i)
+    {
+      array[i] = history.child(first_index+i)[value_path].to_int64();
+    }
+    (*output)["value"].set(array, return_size);
+    delete[] array;
   }
   else
   {
-    double d_rhs = rhs.to_float64();
-    double d_lhs = lhs.to_float64();
-
-    (*output)["value"] = detail::comp_op(d_lhs, d_rhs, op_str);
-    (*output)["type"] = "bool";
+    ASCENT_ERROR(operator_name + ": unsupported array type "<< dtype.to_string());
   }
+  (*output)["type"] = "array";
 
-  // std::cout<<" operation "<name());
-  set_output(output);
-}
+  if(gradient)
+  {
+    if(return_history_index)
+    {
+      long long *index_array = new long long[return_size];
+      for(int i = 0; i < return_size-1; ++i)
+      {
+          index_array[i] = 1;
+      }
+      (*output)["time"].set(index_array, return_size-1);
+      delete[] index_array;
+    }
+    else if(return_simulation_time)
+    {
+      double *simulation_time_array = new double[return_size];
+      for(int i = 0; i < return_size-1; ++i)
+      {
+        simulation_time_array[i]
+          = history.child(first_index + i + 1)["time"].to_float64() - history.child(first_index + i)["time"].to_float64();
 
-//-----------------------------------------------------------------------------
-IfExpr::IfExpr() : Filter()
-{
-  // empty
+      }
+      (*output)["time"].set(simulation_time_array, return_size-1);
+      delete[] simulation_time_array;
+    }
+    else if(return_simulation_cycle)
+    {
+      vector child_names = history.child_names();
+      long long *cycle_array = new long long[return_size];
+      for(int i = 0; i < return_size-1; ++i)
+      {
+          cycle_array[i] = stoll(child_names[first_index + i + 1]) - stoll(child_names[first_index + i]);
+      }
+      (*output)["time"].set(cycle_array, return_size-1);
+      delete[] cycle_array;
+    }
+  }
 }
 
-//-----------------------------------------------------------------------------
-IfExpr::~IfExpr()
-{
-  // empty
-}
 
-//-----------------------------------------------------------------------------
-void
-IfExpr::declare_interface(Node &i)
+conduit::Node *
+range_values_helper(const conduit::Node &history,
+                    const conduit::Node *n_first_absolute_index,
+                    const conduit::Node *n_last_absolute_index,
+                    const conduit::Node *n_first_relative_index,
+                    const conduit::Node *n_last_relative_index,
+                    const conduit::Node *n_first_absolute_time,
+                    const conduit::Node *n_last_absolute_time,
+                    const conduit::Node *n_first_absolute_cycle,
+                    const conduit::Node *n_last_absolute_cycle,
+                    const string &operator_name,
+                    const std::string time_units = "")  // 'cycle' 'index' 'time'
 {
-  i["type_name"] = "expr_if";
-  i["port_names"].append() = "condition";
-  i["port_names"].append() = "if";
-  i["port_names"].append() = "else";
-  i["output_port"] = "true";
-}
+  conduit::Node *output = new conduit::Node();
 
-//-----------------------------------------------------------------------------
-bool
-IfExpr::verify_params(const conduit::Node ¶ms, conduit::Node &info)
-{
-  info.reset();
-  bool res = true;
-  return res;
-}
+  bool absolute =
+    (!n_first_absolute_index->dtype().is_empty() || !n_last_absolute_index->dtype().is_empty());
+  bool relative =
+    (!n_first_relative_index->dtype().is_empty() || !n_last_relative_index->dtype().is_empty());
+  bool simulation_time =
+    (!n_first_absolute_time->dtype().is_empty() || !n_last_absolute_time->dtype().is_empty());
+  bool simulation_cycle =
+    (!n_first_absolute_cycle->dtype().is_empty() || !n_last_absolute_cycle->dtype().is_empty());
 
-//-----------------------------------------------------------------------------
-void
-IfExpr::execute()
-{
-  conduit::Node *n_condition = input("condition");
-  conduit::Node *n_if = input("if");
-  conduit::Node *n_else = input("else");
+  int count = absolute + relative + simulation_time + simulation_cycle;
 
-  conduit::Node *output;
-  if((*n_condition)["value"].to_uint8() == 1)
+  if(count == 0)
   {
-    output = n_if;
+    ASCENT_ERROR(
+        operator_name << ": Must specify a selection range, providing either "
+                      <<"1). first_absolute_index and last_absolute_index, "
+                      <<"2). first_relative_index and last_relative_index, :"
+                      <<"3). first_absolute_time and last_absolute_time, or "
+                      <<"4). first_absolute_cycle and last_absolute_cycle.");
   }
-  else
+
+  if(count > 1)
   {
-    output = n_else;
+    ASCENT_ERROR(
+        operator_name <<": Must specify exactly one selection range, providing either "
+                      <<"1). first_absolute_index and last_absolute_index, "
+                      <<"2). first_relative_index and last_relative_index, "
+                      <<"3). first_absolute_time and last_absolute_time, or "
+                      <<"4). first_absolute_cycle and last_absolute_cycle.");
   }
 
-  resolve_symbol_result(graph(), output, this->name());
-  set_output(output);
-}
-
-//-----------------------------------------------------------------------------
-ArrayAccess::ArrayAccess() : Filter()
-{
-  // empty
-}
-
-//-----------------------------------------------------------------------------
-ArrayAccess::~ArrayAccess()
-{
-  // empty
-}
-
-//-----------------------------------------------------------------------------
-void
-ArrayAccess::declare_interface(Node &i)
-{
-  i["type_name"] = "expr_array";
-  i["port_names"].append() = "array";
-  i["port_names"].append() = "index";
-  i["output_port"] = "true";
-}
+  const conduit::Node *n_first_index, *n_last_index;
+  int first_index = -1, last_index = -1;
+  if(absolute)
+  {
+    n_first_index = n_first_absolute_index;
+    n_last_index = n_last_absolute_index;
+  }
+  else if(relative)
+  {
+    n_first_index = n_first_relative_index;
+    n_last_index = n_last_relative_index;
+  }
+  else if(simulation_cycle)
+  {
+    n_first_index = n_first_absolute_cycle;
+    n_last_index = n_last_absolute_cycle;
+  }
+  else if(simulation_time)
+  {
+    n_first_index = n_first_absolute_time;
+    n_last_index = n_last_absolute_time;
+  }
 
-//-----------------------------------------------------------------------------
-bool
-ArrayAccess::verify_params(const conduit::Node ¶ms, conduit::Node &info)
-{
-  info.reset();
-  bool res = true;
-  return res;
-}
+  const int entries = history.number_of_children();
+  if(entries <= 0)
+  {
+    ASCENT_ERROR(
+        operator_name + ": no entries collected for expression.");
+  }
 
-//-----------------------------------------------------------------------------
-void
-ArrayAccess::execute()
-{
-  const conduit::Node *n_array = input("array");
-  const conduit::Node *n_index = input("index");
+  if(!n_first_index->has_path("value"))
+  {
+    ASCENT_ERROR(
+        operator_name + ": internal error. first_index does not have child value");
+  }
+  if(!n_last_index->has_path("value"))
+  {
+    ASCENT_ERROR(
+        operator_name + ": internal error. last_index does not have child value");
+  }
 
-  conduit::Node *output = new conduit::Node();
+  get_first_and_last_index(operator_name,
+                          history,
+                          entries,
+                          n_first_index,
+                          n_last_index,
+                          absolute,
+                          relative,
+                          simulation_time,
+                          simulation_cycle,
+                          first_index,
+                          last_index);
 
-  int index = (*n_index)["value"].as_int32();
-  int length = (*n_array)["value"].dtype().number_of_elements();
-  if(index > length - 1)
+  //the entire range falls outside what has been recorded so far
+  if(first_index < 0 && last_index < 0)
   {
-    ASCENT_ERROR("ArrayAccess: array index out of bounds: [0," << length - 1
-                                                               << "]");
+    return output;
   }
-  const double *arr = (*n_array)["value"].value();
-  (*output)["value"] = arr[index];
-  (*output)["type"] = "double";
 
-  resolve_symbol_result(graph(), output, this->name());
-  set_output(output);
-}
+  const int return_size = last_index - first_index + 1;
 
-//-----------------------------------------------------------------------------
-DotAccess::DotAccess() : Filter()
-{
-  // empty
-}
+  bool return_history_index = time_units == "index";
+  bool return_simulation_time = time_units == "time";
+  bool return_simulation_cycle = time_units == "cycle";
 
-//-----------------------------------------------------------------------------
-DotAccess::~DotAccess()
-{
-  // empty
-}
+  set_values_from_history(operator_name,
+                          history,
+                          first_index,
+                          return_size,
+                          return_history_index,
+                          return_simulation_time,
+                          return_simulation_cycle,
+                          output);
 
-//-----------------------------------------------------------------------------
-void
-DotAccess::declare_interface(Node &i)
-{
-  i["type_name"] = "expr_dot";
-  i["port_names"].append() = "obj";
-  i["output_port"] = "true";
+  return output;
 }
 
-//-----------------------------------------------------------------------------
-bool
-DotAccess::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+
+} // namespace detail
+
+void resolve_symbol_result(flow::Graph &graph,
+                           const conduit::Node *output,
+                           const std::string filter_name)
 {
-  info.reset();
-  bool res = true;
-  if(!params.has_path("name"))
+  conduit::Node *symbol_table =
+    graph.workspace().registry().fetch("symbol_table");
+  const int num_symbols = symbol_table->number_of_children();
+  for(int i = 0; i < num_symbols; ++i)
   {
-    info["errors"].append() = "DotAccess: Missing required parameter 'name'";
-    res = false;
+    conduit::Node &symbol = symbol_table->child(i);
+    if(symbol["filter_name"].as_string() == filter_name)
+    {
+      symbol["value"] = output->fetch("value");
+      break;
+    }
   }
-  return res;
 }
-
-//-----------------------------------------------------------------------------
-void
-DotAccess::execute()
+void binning_interface(const std::string &reduction_var,
+                       const std::string &reduction_op,
+                       const conduit::Node &n_empty_bin_val,
+                       const conduit::Node &n_component,
+                       const conduit::Node &n_axis_list,
+                       conduit::Node &dataset,
+                       conduit::Node &n_binning,
+                       conduit::Node &n_output_axes)
 {
-  conduit::Node *n_obj = input("obj");
-  std::string name = params()["name"].as_string();
-
-  conduit::Node *output = new conduit::Node();
+  std::string component = "";
+  if(!n_component.dtype().is_empty())
+  {
+    component = n_component["value"].as_string();
+  }
 
-  // fills attrs for basic types like vectors
-  detail::fill_attrs(*n_obj);
+  if(!n_axis_list.has_path("type"))
+  {
+    ASCENT_ERROR("Binning: axis list missing object type.");
+  }
+  std::string obj_type = n_axis_list["type"].as_string();
+  if(obj_type != "list")
+  {
+    ASCENT_ERROR("Binning: axis list is not type 'list'."
+                  <<" type is '"<has_path("attrs/" + name))
+  // verify reduction_var
+  if(reduction_var.empty())
   {
-    n_obj->print();
-    std::stringstream ss;
-    if(n_obj->has_path("attrs"))
+    if(reduction_op != "sum" && reduction_op != "pdf")
     {
-      std::string attr_yaml = (*n_obj)["attrs"].to_yaml();
-      if(attr_yaml == "")
-      {
-        ss<<" No known attribtues.";
-      }
-      else
+      ASCENT_ERROR("Binning: reduction_var can only be left empty if "
+                   "reduction_op is 'sum' or 'pdf'.");
+    }
+  }
+  else if(!is_xyz(reduction_var))
+  {
+    if(!has_field(dataset, reduction_var))
+    {
+      std::string known;
+      if(dataset.number_of_children() > 0 )
       {
-        ss<<" Known attributes: "< names = dataset.child(0)["fields"].child_names();
+        std::stringstream ss;
+        ss << "[";
+        for(size_t i = 0; i < names.size(); ++i)
+        {
+          ss << " '" << names[i]<<"'";
+        }
+        ss << "]";
+        known = ss.str();
       }
+      ASCENT_ERROR("Binning: reduction variable '"
+                   << reduction_var
+                   << "' must be a scalar field in the dataset or x/y/z or empty."
+                   << " known = " << known);
     }
-    else
+
+    bool scalar = is_scalar_field(dataset, reduction_var);
+    if(!scalar && component == "")
     {
-      ss<<" No known attributes.";
+      ASCENT_ERROR("Binning: reduction variable '"
+                   << reduction_var <<"'"
+                   << " has multiple components and no 'component' is"
+                   << " specified."
+                   << " known components = "
+                   << possible_components(dataset, reduction_var));
+    }
+    if(scalar && component != "")
+    {
+      ASCENT_ERROR("Binning: reduction variable '"
+                   << reduction_var <<"'"
+                   << " is a scalar(i.e., has not components "
+                   << " but 'component' " << " '"<> bindexes;
+  // n_binning = data_binning(dataset,
+  //                          n_output_axes,
+  //                          reduction_var,
+  //                          reduction_op,
+  //                          empty_bin_val,
+  //                          component,
+  //                          bindexes);
+
+}
 
-    ASCENT_ERROR("'"<name());
-  set_output(output);
-}
+//*****************************************************************************
+// ExprBoolean
+//*****************************************************************************
 
 //-----------------------------------------------------------------------------
-ArrayMin::ArrayMin() : Filter()
+ExprBoolean::ExprBoolean()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-ArrayMin::~ArrayMin()
+ExprBoolean::~ExprBoolean()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-ArrayMin::declare_interface(Node &i)
+ExprBoolean::declare_interface(Node &i)
 {
-  i["type_name"] = "array_min";
-  i["port_names"].append() = "arg1";
+  i["type_name"] = "expr_bool";
+  i["port_names"] = DataType::empty();
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-ArrayMin::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprBoolean::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
+  if(!params.has_path("value"))
+  {
+    info["errors"].append() = "Missing required numeric parameter 'value'";
+    res = false;
+  }
   return res;
 }
 
 //-----------------------------------------------------------------------------
 void
-ArrayMin::execute()
+ExprBoolean::execute()
 {
   conduit::Node *output = new conduit::Node();
-  std::string exec = ExecutionManager::preferred_cpu_policy();
-  (*output)["value"] = array_min((*input("arg1"))["value"], exec)["value"];
-  (*output)["type"] = "double";
-
-  resolve_symbol_result(graph(), output, this->name());
+  (*output)["value"] = params()["value"].to_uint8();
+  (*output)["type"] = "bool";
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprInteger
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-ScalarMin::ScalarMin() : Filter()
+ExprInteger::ExprInteger() : Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-ScalarMin::~ScalarMin()
+ExprInteger::~ExprInteger()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-ScalarMin::declare_interface(Node &i)
+ExprInteger::declare_interface(Node &i)
 {
-  i["type_name"] = "scalar_min";
-  i["port_names"].append() = "arg1";
-  i["port_names"].append() = "arg2";
+  i["type_name"] = "expr_integer";
+  i["port_names"] = DataType::empty();
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-ScalarMin::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprInteger::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
+  if(!params.has_path("value"))
+  {
+    info["errors"].append() = "Missing required numeric parameter 'value'";
+    res = false;
+  }
   return res;
 }
 
 //-----------------------------------------------------------------------------
 void
-ScalarMin::execute()
+ExprInteger::execute()
 {
-  const conduit::Node *arg1 = input("arg1");
-  const conduit::Node *arg2 = input("arg2");
-
   conduit::Node *output = new conduit::Node();
-
-  if((*arg1)["type"].as_string() == "double" ||
-     (*arg2)["type"].as_string() == "double")
-  {
-    double d_rhs = (*arg1)["value"].to_float64();
-    double d_lhs = (*arg2)["value"].to_float64();
-    (*output)["value"] = std::min(d_lhs, d_rhs);
-    (*output)["type"] = "double";
-  }
-  else
-  {
-    int i_rhs = (*arg1)["value"].to_int32();
-    int i_lhs = (*arg2)["value"].to_int32();
-    (*output)["value"] = std::min(i_lhs, i_rhs);
-    (*output)["type"] = "int";
-  }
-
-  resolve_symbol_result(graph(), output, this->name());
+  (*output)["value"] = params()["value"].to_int32();
+  (*output)["type"] = "int";
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprDouble
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-ScalarMax::ScalarMax() : Filter()
+ExprDouble::ExprDouble()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-ScalarMax::~ScalarMax()
+ExprDouble::~ExprDouble()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-ScalarMax::declare_interface(Node &i)
+ExprDouble::declare_interface(Node &i)
 {
-  i["type_name"] = "scalar_max";
-  i["port_names"].append() = "arg1";
-  i["port_names"].append() = "arg2";
+  i["type_name"] = "expr_double";
+  i["port_names"] = DataType::empty();
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-ScalarMax::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprDouble::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
+  if(!params.has_path("value"))
+  {
+    info["errors"].append() = "Missing required numeric parameter 'value'";
+    res = false;
+  }
   return res;
 }
 
 //-----------------------------------------------------------------------------
 void
-ScalarMax::execute()
+ExprDouble::execute()
 {
-
-  const conduit::Node *arg1 = input("arg1");
-  const conduit::Node *arg2 = input("arg2");
-
   conduit::Node *output = new conduit::Node();
-
-  if((*arg1)["type"].as_string() == "double" ||
-     (*arg2)["type"].as_string() == "double")
-  {
-    double d_rhs = (*arg1)["value"].to_float64();
-    double d_lhs = (*arg2)["value"].to_float64();
-    (*output)["value"] = std::max(d_lhs, d_rhs);
-    (*output)["type"] = "double";
-  }
-  else
-  {
-    int i_rhs = (*arg1)["value"].to_int32();
-    int i_lhs = (*arg2)["value"].to_int32();
-    (*output)["value"] = std::max(i_lhs, i_rhs);
-    (*output)["type"] = "int";
-  }
-
-  resolve_symbol_result(graph(), output, this->name());
+  (*output)["value"] = params()["value"].to_float64();
+  (*output)["type"] = "double";
   set_output(output);
 }
 
+
+//*****************************************************************************
+// ExprString
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-FieldMin::FieldMin() : Filter()
+ExprString::ExprString()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-FieldMin::~FieldMin()
+ExprString::~ExprString()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-FieldMin::declare_interface(Node &i)
+ExprString::declare_interface(Node &i)
 {
-  i["type_name"] = "field_min";
-  i["port_names"].append() = "arg1";
+  i["type_name"] = "expr_string";
+  i["port_names"] = DataType::empty();
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-FieldMin::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprString::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
+  if(!params.has_path("value"))
+  {
+    info["errors"].append() = "Missing required string parameter 'value'";
+    res = false;
+  }
   return res;
 }
 
 //-----------------------------------------------------------------------------
 void
-FieldMin::execute()
+ExprString::execute()
 {
-  const conduit::Node *arg1 = input("arg1");
-
-  const std::string field = (*arg1)["value"].as_string();
-
   conduit::Node *output = new conduit::Node();
 
-  DataObject *data_object =
-    graph().workspace().registry().fetch("dataset");
-  const conduit::Node *const dataset = data_object->as_low_order_bp().get();
-
-  if(!is_scalar_field(*dataset, field))
-  {
-    ASCENT_ERROR("FieldMin: field '" << field << "' is not a scalar field");
-  }
-
-  conduit::Node n_min = field_min(*dataset, field);
-
-  (*output)["type"] = "value_position";
-  (*output)["attrs/value/value"] = n_min["value"];
-  (*output)["attrs/value/type"] = "double";
-  (*output)["attrs/position/value"] = n_min["position"];
-  (*output)["attrs/position/type"] = "vector";
-  // information about the element/field
-  (*output)["attrs/element/rank"] = n_min["rank"];
-  (*output)["attrs/element/domain_index"] = n_min["domain_id"];
-  (*output)["attrs/element/index"] = n_min["index"];
-  (*output)["attrs/element/assoc"] = n_min["assoc"];
-
-  resolve_symbol_result(graph(), output, this->name());
+  (*output)["value"] = params()["value"].as_string();
+  (*output)["type"] = "string";
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprNan
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-ArrayMax::ArrayMax() : Filter()
+ExprNan::ExprNan() : Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-ArrayMax::~ArrayMax()
+ExprNan::~ExprNan()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-ArrayMax::declare_interface(Node &i)
+ExprNan::declare_interface(Node &i)
 {
-  i["type_name"] = "array_max";
-  i["port_names"].append() = "arg1";
+  i["type_name"] = "expr_nan";
+  i["port_names"] = DataType::empty();
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-ArrayMax::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprNan::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -1131,41 +1061,44 @@ ArrayMax::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-ArrayMax::execute()
+ExprNan::execute()
 {
   conduit::Node *output = new conduit::Node();
-  std::string exec = ExecutionManager::preferred_cpu_policy();
-  (*output)["value"] = array_max((*input("arg1"))["value"], exec)["value"];
-  (*output)["type"] = "double";
 
-  resolve_symbol_result(graph(), output, this->name());
+  (*output)["type"] = "double";
+  (*output)["value"] = nan("");;
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprNull
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-FieldMax::FieldMax() : Filter()
+ExprNull::ExprNull()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-FieldMax::~FieldMax()
+ExprNull::~ExprNull()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-FieldMax::declare_interface(Node &i)
+ExprNull::declare_interface(Node &i)
 {
-  i["type_name"] = "field_max";
-  i["port_names"].append() = "arg1";
+  i["type_name"] = "expr_null";
+  i["port_names"] = DataType::empty();
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-FieldMax::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprNull::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -1174,801 +1107,678 @@ FieldMax::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-FieldMax::execute()
+ExprNull::execute()
 {
-
-  const conduit::Node *arg1 = input("arg1");
-
-  const std::string field = (*arg1)["value"].as_string();
-
   conduit::Node *output = new conduit::Node();
-
-  DataObject *data_object =
-    graph().workspace().registry().fetch("dataset");
-  const conduit::Node *const dataset = data_object->as_low_order_bp().get();
-
-  if(!is_scalar_field(*dataset, field))
-  {
-    ASCENT_ERROR("FieldMax: field '" << field << "' is not a scalar field");
-  }
-
-  conduit::Node n_max = field_max(*dataset, field);
-
-  (*output)["type"] = "value_position";
-  (*output)["attrs/value/value"] = n_max["value"];
-  (*output)["attrs/value/type"] = "double";
-  (*output)["attrs/position/value"] = n_max["position"];
-  (*output)["attrs/position/type"] = "vector";
-  // information about the element/field
-  (*output)["attrs/element/rank"] = n_max["rank"];
-  (*output)["attrs/element/domain_index"] = n_max["domain_id"];
-  (*output)["attrs/element/index"] = n_max["index"];
-  (*output)["attrs/element/assoc"] = n_max["assoc"];
-
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprIdentifier
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-ArrayAvg::ArrayAvg() : Filter()
+ExprIdentifier::ExprIdentifier()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-ArrayAvg::~ArrayAvg()
+ExprIdentifier::~ExprIdentifier()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-ArrayAvg::declare_interface(Node &i)
+ExprIdentifier::declare_interface(Node &i)
 {
-  i["type_name"] = "array_avg";
-  i["port_names"].append() = "arg1";
+  i["type_name"] = "expr_identifier";
+  i["port_names"] = DataType::empty();
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-ArrayAvg::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprIdentifier::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
+  if(!params.has_path("value"))
+  {
+    info["errors"].append() = "Missing required string parameter 'value'";
+    res = false;
+  }
   return res;
 }
 
 //-----------------------------------------------------------------------------
 void
-ArrayAvg::execute()
+ExprIdentifier::execute()
 {
   conduit::Node *output = new conduit::Node();
-  std::string exec = ExecutionManager::preferred_cpu_policy();
-  conduit::Node sum = array_sum((*input("arg1"))["value"], exec);
-  (*output)["value"] = sum["value"].to_float64() / sum["count"].to_float64();
-  (*output)["type"] = "double";
+  std::string i_name = params()["value"].as_string();
+
+  const conduit::Node *const cache =
+      graph().workspace().registry().fetch("cache");
+  if(!cache->has_path(i_name))
+  {
+    ASCENT_ERROR("Unknown expression identifier: '" << i_name << "'");
+  }
+
+  const int entries = (*cache)[i_name].number_of_children();
+  if(entries < 1)
+  {
+    ASCENT_ERROR("Expression identifier: needs at least one entry");
+  }
+  // grab the last one calculated so we have type info
+  (*output) = (*cache)[i_name].child(entries - 1);
+  // we need to keep the name to retrieve the cache
+  // if history is called.
+  (*output)["name"] = i_name;
 
+  resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprObjectDotAccess
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-ScalarGradient::ScalarGradient() : Filter()
+ExprObjectDotAccess::ExprObjectDotAccess() : Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-ScalarGradient::~ScalarGradient()
+ExprObjectDotAccess::~ExprObjectDotAccess()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-ScalarGradient::declare_interface(Node &i)
+ExprObjectDotAccess::declare_interface(Node &i)
 {
-  i["type_name"] = "scalar_gradient";
-  i["port_names"].append() = "expr_name";
-  i["port_names"].append() = "window_length";
-  i["port_names"].append() = "window_length_unit";
+  i["type_name"] = "expr_dot";
+  i["port_names"].append() = "obj";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-ScalarGradient::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprObjectDotAccess::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
-  return res;
-}
-
-//-----------------------------------------------------------------------------
-void
-ScalarGradient::execute()
-{
-  conduit::Node *output = new conduit::Node();
-  const std::string expr_name  = (*input("expr_name"))["name"].as_string();
-  conduit::Node &n_window_length = *input("window_length");
-  conduit::Node &n_window_length_unit = *input("window_length_unit");
-
-  const conduit::Node *const cache =
-      graph().workspace().registry().fetch("cache");
-
-  if(!cache->has_path(expr_name))
-  {
-    ASCENT_ERROR("ScalarGradient: unknown identifier "<<  expr_name);
-  }
-
-  // handle the optional inputs
-  double window_length = 1;
-  if(!n_window_length.dtype().is_empty())
-  {
-    window_length = n_window_length["value"].to_float64();
-  }
-  if(window_length < 0)
-  {
-     ASCENT_ERROR("ScalarGradient: window_length must non-negative." );
-  }
-
-  string units = "index";
-  if(!n_window_length_unit.dtype().is_empty())
-  {
-    units = n_window_length_unit["value"].as_string();
-  }
-
-  bool execution_points = units == "index";
-  bool time = units == "time";
-  bool cycles = units == "cycle";
-  int total = execution_points + time + cycles;
-
-  if(total == 0 && !n_window_length_unit.dtype().is_empty())
+  if(!params.has_path("name"))
   {
-     ASCENT_ERROR("ScalarGradient: if a ``window_length_unit`` value is provided,"
-                  <<" it must be set to either: 1). \"index\", 2). \"time\", or 3). \"cycle\"." );
+    info["errors"].append() = "DotAccess: Missing required parameter 'name'";
+    res = false;
   }
+  return res;
+}
 
-  if((execution_points || cycles) && window_length < 1) {
-     ASCENT_ERROR("ScalarGradient: window_length must be at least 1 if the window length unit is \"index\" or \"cycle\"." );
-  }
+//-----------------------------------------------------------------------------
+void
+ExprObjectDotAccess::execute()
+{
+  conduit::Node *n_obj = input("obj");
+  std::string name = params()["name"].as_string();
 
-  const conduit::Node &history = (*cache)[expr_name];
+  conduit::Node *output = new conduit::Node();
 
-  const int entries = history.number_of_children();
-  if(entries < 2)
-  {
-    (*output)["value"] = -std::numeric_limits::infinity();
-    (*output)["type"] = "double";
-    set_output(output);
-    return;
-  }
+  // fills attrs for basic types like vectors
+  detail::fill_attrs(*n_obj);
 
-  int first_index = 0, current_index = entries - 1;
-  if(execution_points)
-  {
-    //clamp the first index if the window length has gone too far
-    if(window_length - current_index > 0)
-    {
-      first_index = 0;
-      window_length = current_index;
-    }
-    else
-    {
-      first_index = current_index - window_length;
-    }
-  }
-  else if(time)
+  // TODO test accessing non-existent attribute
+  if(!n_obj->has_path("attrs/" + name))
   {
-   string time_path = "time";
-   if(!history.child(current_index).has_path(time_path))
-    {
-      ASCENT_ERROR("ScalarGradient: interal error. current time point does not have the child " + time_path);
-    }
-    const double current_time = history.child(current_index)[time_path].to_float64();
-    const double first_time = current_time - window_length;
-    double time;
-    for(int index = 0; index < entries; index++)
+    n_obj->print();
+    std::stringstream ss;
+    if(n_obj->has_path("attrs"))
     {
-      if(history.child(index).has_path(time_path))
+      std::string attr_yaml = (*n_obj)["attrs"].to_yaml();
+      if(attr_yaml == "")
       {
-        time = history.child(index)[time_path].to_float64();
+        ss<<" No known attributes.";
       }
       else
       {
-        ASCENT_ERROR("ScalarGradient: a time point in evaluation window (for the calculation at absolute index: " + to_string(index) + ") does not have the child " + time_path );
-      }
-      if(time >= first_time) {
-        first_index = index;
-        //adjust so our window length is accurate (since we may not have performed a calculation at precisely the requested time)
-        window_length = current_time - time;
-        break;
-      }
-    }
-  }
-  else if(cycles)
-  {
-    vector child_names = history.child_names();
-    if(child_names.size() != entries)
-    {
-      ASCENT_ERROR("ScalarGradient: internal error. number of history "
-                   <<"entries: " << to_string(entries)
-                   <<", but number of history child names: "
-                   <= first_cycle)
-      {
-        first_index = index;
-        //adjust so our window length is accurate (since we may not have performed a calculation at precisely the requested time)
-        window_length = current_cycle - cycle;
-        break;
+        ss<<" Known attributes: "< value_paths = {"value", "attrs/value/value"};
-  if(current_index < 0 || current_index >= entries)
-  {
-    ASCENT_ERROR("Scalar gradient: bad current index: "<= entries)
-  {
-    ASCENT_ERROR("Scalar gradient: bad first index: "<name());
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprIf
+//*****************************************************************************
 
 //-----------------------------------------------------------------------------
-ArrayGradient::ArrayGradient() : Filter()
+ExprIf::ExprIf()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-ArrayGradient::~ArrayGradient()
+ExprIf::~ExprIf()
 {
   // empty
 }
 
-
-// -----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
 void
-ArrayGradient::declare_interface(Node &i)
+ExprIf::declare_interface(Node &i)
 {
-  i["type_name"] = "gradient_range";
-  i["port_names"].append() = "expr_name";
-  i["port_names"].append() = "first_absolute_index";
-  i["port_names"].append() = "last_absolute_index";
-  i["port_names"].append() = "first_relative_index";
-  i["port_names"].append() = "last_relative_index";
-  i["port_names"].append() = "first_absolute_time";
-  i["port_names"].append() = "last_absolute_time";
-  i["port_names"].append() = "first_absolute_cycle";
-  i["port_names"].append() = "last_absolute_cycle";
+  i["type_name"] = "expr_if";
+  i["port_names"].append() = "condition";
+  i["port_names"].append() = "if";
+  i["port_names"].append() = "else";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-ArrayGradient::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprIf::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
   return res;
 }
 
-void get_first_and_last_index(const string &operator_name,
-                              const conduit::Node &history,
-                              const int &entries,
-                              const conduit::Node *n_first_index,
-                              const conduit::Node *n_last_index,
-                              bool absolute,
-                              bool relative,
-                              bool simulation_time,
-                              bool simulation_cycle,
-                              int &first_index,
-                              int &last_index)
+//-----------------------------------------------------------------------------
+void
+ExprIf::execute()
 {
+  conduit::Node *n_condition = input("condition");
+  conduit::Node *n_if = input("if");
+  conduit::Node *n_else = input("else");
 
-  if(absolute || relative)
+  conduit::Node *output;
+  if((*n_condition)["value"].to_uint8() == 1)
   {
-    first_index = (*n_first_index)["value"].to_int32();
-    last_index = (*n_last_index)["value"].to_int32();
+    output = n_if;
+  }
+  else
+  {
+    output = n_else;
+  }
 
-    if(first_index < 0 || last_index < 0)
-    {
-      ASCENT_ERROR(operator_name + ": the first index and last index must both be non-negative integers.");
-    }
+  resolve_symbol_result(graph(), output, this->name());
+  set_output(output);
+}
 
-    if(first_index > last_index)
-    {
-      ASCENT_ERROR(operator_name + ": the first index must not be greater than the last index.");
-    }
 
-    if(relative) {
-      int relative_first_index = first_index;
-      int relative_last_index = last_index;
-      //when retrieving from m to n cycles ago, where m < n, n will have a lower history index than m
-      first_index = entries - relative_last_index - 1;
-      last_index = entries - relative_first_index - 1;
-      //clamp it to the first cycle
-      if(first_index < 0) {
-        first_index = 0;
-      }
-    }
-    else
-    {
-      //clamp it to the last cycle
-      if(last_index >= entries)
-      {
-        last_index = entries - 1;
-      }
-    }
-  }
-  else if(simulation_time)
+//*****************************************************************************
+// ExprBinaryOp
+//*****************************************************************************
+
+//-----------------------------------------------------------------------------
+ExprBinaryOp::ExprBinaryOp()
+: Filter()
+{
+  // empty
+}
+
+//-----------------------------------------------------------------------------
+ExprBinaryOp::~ExprBinaryOp()
+{
+  // empty
+}
+
+//-----------------------------------------------------------------------------
+void
+ExprBinaryOp::declare_interface(Node &i)
+{
+  i["type_name"] = "expr_binary_op";
+  i["port_names"].append() = "lhs";
+  i["port_names"].append() = "rhs";
+  i["output_port"] = "true";
+}
+
+//-----------------------------------------------------------------------------
+bool
+ExprBinaryOp::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+{
+  info.reset();
+  bool res = true;
+  if(!params.has_path("op_string"))
   {
-    double first_time = (*n_first_index)["value"].to_float64();
-    double last_time = (*n_last_index)["value"].to_float64();
+    info["errors"].append() = "Missing required string parameter 'op_string'";
+    res = false;
+  }
+  return res;
+}
 
-    // we might want window relative to the current time, and
-    // if that window is larger than what we currently have,
-    // clamp the values to 0
-    // Another possible solution to this is to specify relative times
-    first_time = std::max(0.0, first_time);
-    last_time = std::max(0.0, last_time);
+//-----------------------------------------------------------------------------
+void
+ExprBinaryOp::execute()
+{
+  const conduit::Node *n_lhs = input("lhs");
+  const conduit::Node *n_rhs = input("rhs");
 
-    if(first_time < 0 || last_time < 0)
-    {
-      ASCENT_ERROR(operator_name + ": the first_absolute_time and last_absolute_time "<<
-                   " must both be non-negative.");
-    }
+  const conduit::Node &lhs = (*n_lhs)["value"];
+  const conduit::Node &rhs = (*n_rhs)["value"];
 
-    if(first_time > last_time)
-    {
-      ASCENT_ERROR(operator_name +
-                   ": the first_absolute_time must not be "
-                   <<"greater than the last_absolute_time.");
-    }
+  std::string op_str = params()["op_string"].as_string();
+  const std::string l_type = (*n_lhs)["type"].as_string();
+  const std::string r_type = (*n_rhs)["type"].as_string();
 
-    string time_path = "time";
+  conduit::Node *output = new conduit::Node();
+  std::stringstream msg;
 
-    double time;
-    last_index = 0;
-    for(int index = 0; index < entries; index++)
+  if(detail::is_math(op_str))
+  {
+    if(detail::is_scalar(l_type) && detail::is_scalar(r_type))
     {
-      if(history.child(index).has_path(time_path))
+      // promote to double if at least one is a double
+      if(l_type == "double" || r_type == "double")
       {
-        time = history.child(index)[time_path].to_float64();
+        double d_rhs = rhs.to_float64();
+        double d_lhs = lhs.to_float64();
+        (*output)["value"] = detail::math_op(d_lhs, d_rhs, op_str);
+        (*output)["type"] = "double";
       }
       else
       {
-        ASCENT_ERROR(operator_name << ": internal error. missing " << time_path
-                     << " value for time point in retrieval window (for the"
-                     <<" calculation at absolute index: " + to_string(index) + ")." );
-      }
-
-      // I am not totally sure about this logic. Part of the problem is that we
-      // haven't fully specified what we want this behavior to be.
-      if(first_index == -1 && time >= first_time)
-      {
-        first_index = index;
-      }
-      if(time <= last_time)
-      {
-        last_index = index;
-      }
-      if(time > last_time)
-      {
-        break;
+        int i_rhs = rhs.to_int32();
+        int i_lhs = lhs.to_int32();
+        (*output)["value"] = detail::math_op(i_lhs, i_rhs, op_str);
+        (*output)["type"] = "int";
       }
     }
-    //clamp it to the last index to at least the first index
-    if(last_index < first_index)
+    else
     {
-      last_index = first_index;
+      if(detail::is_scalar(l_type) != detail::is_scalar(r_type))
+      {
+        msg << "' " << l_type << " " << op_str << " " << r_type << "'";
+        ASCENT_ERROR(
+            "Mixed vector and scalar quantities not implemented / supported: "
+            << msg.str());
+      }
+
+      double res[3];
+      detail::vector_op(lhs.value(), rhs.value(), op_str, res);
+
+      (*output)["value"].set(res, 3);
+      (*output)["type"] = "vector";
     }
   }
-  else if(simulation_cycle)
+  else if(detail::is_logic(op_str))
   {
-    long long first_cycle = (*n_first_index)["value"].to_int64();
-    long long last_cycle = (*n_last_index)["value"].to_int64();
 
-    if(first_cycle < 0 || last_cycle < 0)
-    {
-      ASCENT_ERROR(operator_name + ": the first_absolute_cycle and last_absolute_cycle must both be non-negative.");
-    }
+    bool b_lhs = lhs.to_uint8();
+    bool b_rhs = rhs.to_uint8();
+    (*output)["value"] = detail::logic_op(b_lhs, b_rhs, op_str);
+    (*output)["type"] = "bool";
+  }
+  else // comparison
+  {
+    double d_rhs = rhs.to_float64();
+    double d_lhs = lhs.to_float64();
 
-    if(first_cycle > last_cycle)
-    {
-      ASCENT_ERROR(operator_name + ": the first_absolute_cycle must not be greater than the last_absolute_cycle.");
-    }
+    (*output)["value"] = detail::comp_op(d_lhs, d_rhs, op_str);
+    (*output)["type"] = "bool";
+  }
 
-    vector child_names = history.child_names();
-    if(child_names.size() != entries)
-    {
-      ASCENT_ERROR(operator_name + ": internal error. number of history entries: "
-                   <= first_cycle)
-      {
-        first_index = index;
-      }
-      else if(cycle > last_cycle)
-      {
-        last_index = index - 1;
-        break;
-      }
-    }
-    //clamp it to the last index
-    if(last_index == -1)
-    {
-      last_index = entries - 1;
-    }
-  }
+  resolve_symbol_result(graph(), output, this->name());
+  set_output(output);
 }
 
-void set_values_from_history(const string &operator_name,
-                             const conduit::Node &history,
-                             int first_index,
-                             int return_size,
-                             bool return_history_index,
-                             bool return_simulation_time,
-                             bool return_simulation_cycle,
-                             conduit::Node *output)
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//---------------------------------------------------------------------------//
+// Scalar Operations
+//  min, max, abs, exp, log, pow
+//---------------------------------------------------------------------------//
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+//*****************************************************************************
+// ExprScalarMin
+//*****************************************************************************
+
+//-----------------------------------------------------------------------------
+ExprScalarMin::ExprScalarMin() : Filter()
 {
+  // empty
+}
 
-  bool gradient = (return_history_index || return_simulation_time || return_simulation_cycle);
+//-----------------------------------------------------------------------------
+ExprScalarMin::~ExprScalarMin()
+{
+  // empty
+}
 
-  string value_path = "";
-  vector value_paths = {"value", "attrs/value/value"};
-  for(const string &path : value_paths)
-  {
-    if(history.child(first_index).has_path(path))
-    {
-      value_path = path;
-      break;
-    }
-  }
+//-----------------------------------------------------------------------------
+void
+ExprScalarMin::declare_interface(Node &i)
+{
+  i["type_name"] = "expr_scalar_min";
+  i["port_names"].append() = "arg1";
+  i["port_names"].append() = "arg2";
+  i["output_port"] = "true";
+}
 
+//-----------------------------------------------------------------------------
+bool
+ExprScalarMin::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+{
+  info.reset();
+  bool res = true;
+  return res;
+}
 
-  if(value_path.size() == 0)
-  {
-    ASCENT_ERROR("ScalarGradient: interal error. first index does not have one of the expected value paths");
-  }
+//-----------------------------------------------------------------------------
+void
+ExprScalarMin::execute()
+{
+  const conduit::Node *arg1 = input("arg1");
+  const conduit::Node *arg2 = input("arg2");
 
-  conduit::DataType dtype = history.child(first_index)[value_path].dtype();
+  conduit::Node *output = new conduit::Node();
 
-  if(dtype.is_float32())
-  {
-    float *array = new float[return_size];
-    for(int i = 0; i < return_size; ++i)
-    {
-      array[i] = history.child(first_index+i)[value_path].to_float32();
-    }
-    (*output)["value"].set(array, return_size);
-    delete[] array;
-  }
-  else if(dtype.is_float64())
-  {
-    double *array = new double[return_size];
-    for(int i = 0; i < return_size; ++i)
-    {
-      array[i] = history.child(first_index+i)[value_path].to_float64();
-    }
-    (*output)["value"].set(array, return_size);
-    delete[] array;
-  }
-  else if(dtype.is_int32())
-  {
-    int *array = new int[return_size];
-    for(int i = 0; i < return_size; ++i)
-    {
-      array[i] = history.child(first_index+i)[value_path].to_int32();
-    }
-    (*output)["value"].set(array, return_size);
-    delete[] array;
-  }
-  else if(dtype.is_int64())
+  if((*arg1)["type"].as_string() == "double" ||
+     (*arg2)["type"].as_string() == "double")
   {
-    long long *array = new long long[return_size];
-    for(int i = 0; i < return_size; ++i)
-    {
-      array[i] = history.child(first_index+i)[value_path].to_int64();
-    }
-    (*output)["value"].set(array, return_size);
-    delete[] array;
+    double d_rhs = (*arg1)["value"].to_float64();
+    double d_lhs = (*arg2)["value"].to_float64();
+    (*output)["value"] = std::min(d_lhs, d_rhs);
+    (*output)["type"] = "double";
   }
   else
   {
-    ASCENT_ERROR(operator_name + ": unsupported array type "<< dtype.to_string());
+    int i_rhs = (*arg1)["value"].to_int32();
+    int i_lhs = (*arg2)["value"].to_int32();
+    (*output)["value"] = std::min(i_lhs, i_rhs);
+    (*output)["type"] = "int";
   }
-  (*output)["type"] = "array";
 
-  if(gradient)
-  {
-    if(return_history_index)
-    {
-      long long *index_array = new long long[return_size];
-      for(int i = 0; i < return_size-1; ++i)
-      {
-          index_array[i] = 1;
-      }
-      (*output)["time"].set(index_array, return_size-1);
-      delete[] index_array;
-    }
-    else if(return_simulation_time)
-    {
-      double *simulation_time_array = new double[return_size];
-      for(int i = 0; i < return_size-1; ++i)
-      {
-        simulation_time_array[i]
-          = history.child(first_index + i + 1)["time"].to_float64() - history.child(first_index + i)["time"].to_float64();
+  resolve_symbol_result(graph(), output, this->name());
+  set_output(output);
+}
 
-      }
-      (*output)["time"].set(simulation_time_array, return_size-1);
-      delete[] simulation_time_array;
-    }
-    else if(return_simulation_cycle)
-    {
-      vector child_names = history.child_names();
-      long long *cycle_array = new long long[return_size];
-      for(int i = 0; i < return_size-1; ++i)
-      {
-          cycle_array[i] = stoll(child_names[first_index + i + 1]) - stoll(child_names[first_index + i]);
-      }
-      (*output)["time"].set(cycle_array, return_size-1);
-      delete[] cycle_array;
-    }
-  }
+//*****************************************************************************
+// ExprScalarMax
+//*****************************************************************************
+
+//-----------------------------------------------------------------------------
+ExprScalarMax::ExprScalarMax() : Filter()
+{
+  // empty
 }
 
+//-----------------------------------------------------------------------------
+ExprScalarMax::~ExprScalarMax()
+{
+  // empty
+}
 
-conduit::Node *
-range_values_helper(const conduit::Node &history,
-                    const conduit::Node *n_first_absolute_index,
-                    const conduit::Node *n_last_absolute_index,
-                    const conduit::Node *n_first_relative_index,
-                    const conduit::Node *n_last_relative_index,
-                    const conduit::Node *n_first_absolute_time,
-                    const conduit::Node *n_last_absolute_time,
-                    const conduit::Node *n_first_absolute_cycle,
-                    const conduit::Node *n_last_absolute_cycle,
-                    const string &operator_name,
-                    const std::string time_units = "")  // 'cycle' 'index' 'time'
+//-----------------------------------------------------------------------------
+void
+ExprScalarMax::declare_interface(Node &i)
 {
-  conduit::Node *output = new conduit::Node();
+  i["type_name"] = "expr_scalar_max";
+  i["port_names"].append() = "arg1";
+  i["port_names"].append() = "arg2";
+  i["output_port"] = "true";
+}
 
-  bool absolute =
-    (!n_first_absolute_index->dtype().is_empty() || !n_last_absolute_index->dtype().is_empty());
-  bool relative =
-    (!n_first_relative_index->dtype().is_empty() || !n_last_relative_index->dtype().is_empty());
-  bool simulation_time =
-    (!n_first_absolute_time->dtype().is_empty() || !n_last_absolute_time->dtype().is_empty());
-  bool simulation_cycle =
-    (!n_first_absolute_cycle->dtype().is_empty() || !n_last_absolute_cycle->dtype().is_empty());
+//-----------------------------------------------------------------------------
+bool
+ExprScalarMax::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+{
+  info.reset();
+  bool res = true;
+  return res;
+}
 
-  int count = absolute + relative + simulation_time + simulation_cycle;
+//-----------------------------------------------------------------------------
+void
+ExprScalarMax::execute()
+{
 
-  if(count == 0)
-  {
-    ASCENT_ERROR(
-        operator_name << ": Must specify a selection range, providing either "
-                      <<"1). first_absolute_index and last_absolute_index, "
-                      <<"2). first_relative_index and last_relative_index, :"
-                      <<"3). first_absolute_time and last_absolute_time, or "
-                      <<"4). first_absolute_cycle and last_absolute_cycle.");
-  }
+  const conduit::Node *arg1 = input("arg1");
+  const conduit::Node *arg2 = input("arg2");
 
-  if(count > 1)
-  {
-    ASCENT_ERROR(
-        operator_name <<": Must specify exactly one selection range, providing either "
-                      <<"1). first_absolute_index and last_absolute_index, "
-                      <<"2). first_relative_index and last_relative_index, "
-                      <<"3). first_absolute_time and last_absolute_time, or "
-                      <<"4). first_absolute_cycle and last_absolute_cycle.");
-  }
+  conduit::Node *output = new conduit::Node();
 
-  const conduit::Node *n_first_index, *n_last_index;
-  int first_index = -1, last_index = -1;
-  if(absolute)
-  {
-    n_first_index = n_first_absolute_index;
-    n_last_index = n_last_absolute_index;
-  }
-  else if(relative)
-  {
-    n_first_index = n_first_relative_index;
-    n_last_index = n_last_relative_index;
-  }
-  else if(simulation_cycle)
+  if((*arg1)["type"].as_string() == "double" ||
+     (*arg2)["type"].as_string() == "double")
   {
-    n_first_index = n_first_absolute_cycle;
-    n_last_index = n_last_absolute_cycle;
+    double d_rhs = (*arg1)["value"].to_float64();
+    double d_lhs = (*arg2)["value"].to_float64();
+    (*output)["value"] = std::max(d_lhs, d_rhs);
+    (*output)["type"] = "double";
   }
-  else if(simulation_time)
+  else
   {
-    n_first_index = n_first_absolute_time;
-    n_last_index = n_last_absolute_time;
+    int i_rhs = (*arg1)["value"].to_int32();
+    int i_lhs = (*arg2)["value"].to_int32();
+    (*output)["value"] = std::max(i_lhs, i_rhs);
+    (*output)["type"] = "int";
   }
 
-  const int entries = history.number_of_children();
-  if(entries <= 0)
-  {
-    ASCENT_ERROR(
-        operator_name + ": no entries collected for expression.");
-  }
+  resolve_symbol_result(graph(), output, this->name());
+  set_output(output);
+}
 
-  if(!n_first_index->has_path("value"))
-  {
-    ASCENT_ERROR(
-        operator_name + ": internal error. first_index does not have child value");
-  }
-  if(!n_last_index->has_path("value"))
-  {
-    ASCENT_ERROR(
-        operator_name + ": internal error. last_index does not have child value");
-  }
+//*****************************************************************************
+// ExprScalarAbs
+//*****************************************************************************
 
-  get_first_and_last_index(operator_name,
-                          history,
-                          entries,
-                          n_first_index,
-                          n_last_index,
-                          absolute,
-                          relative,
-                          simulation_time,
-                          simulation_cycle,
-                          first_index,
-                          last_index);
+//-----------------------------------------------------------------------------
+ExprScalarAbs::ExprScalarAbs()
+: Filter()
+{
+  // empty
+}
 
-  //the entire range falls outside what has been recorded so far
-  if(first_index < 0 && last_index < 0)
+//-----------------------------------------------------------------------------
+ExprScalarAbs::~ExprScalarAbs()
+{
+  // empty
+}
+
+//-----------------------------------------------------------------------------
+void
+ExprScalarAbs::declare_interface(Node &i)
+{
+  i["type_name"] = "expr_scalar_abs";
+  i["port_names"].append() = "arg1";
+  i["output_port"] = "true";
+}
+
+//-----------------------------------------------------------------------------
+bool
+ExprScalarAbs::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+{
+  info.reset();
+  bool res = true;
+  return res;
+}
+
+//-----------------------------------------------------------------------------
+void
+ExprScalarAbs::execute()
+{
+  const conduit::Node *arg1 = input("arg1");
+
+  if((*arg1)["type"].as_string() == "double")
   {
-    return output;
+    double res = 0.;
+    res = abs((*arg1)["value"].to_float64());
+    conduit::Node *output = new conduit::Node();
+    (*output)["type"] = "double";
+    (*output)["value"] = res;
+
+    resolve_symbol_result(graph(), output, this->name());
+    set_output(output);
   }
+  else
+  {
+    int res = 0;
+    res = abs((*arg1)["value"].to_int32());
+    conduit::Node *output = new conduit::Node();
+    (*output)["type"] = "int";
+    (*output)["value"] = res;
 
-  const int return_size = last_index - first_index + 1;
+    resolve_symbol_result(graph(), output, this->name());
+    set_output(output);
+  }
+}
 
-  bool return_history_index = time_units == "index";
-  bool return_simulation_time = time_units == "time";
-  bool return_simulation_cycle = time_units == "cycle";
 
-  set_values_from_history(operator_name,
-                          history,
-                          first_index,
-                          return_size,
-                          return_history_index,
-                          return_simulation_time,
-                          return_simulation_cycle,
-                          output);
+//*****************************************************************************
+// ExprScalarExp
+//*****************************************************************************
 
-  return output;
+//-----------------------------------------------------------------------------
+ExprScalarExp::ExprScalarExp()
+: Filter()
+{
+  // empty
 }
 
+//-----------------------------------------------------------------------------
+ExprScalarExp::~ExprScalarExp()
+{
+  // empty
+}
 
 //-----------------------------------------------------------------------------
 void
-ArrayGradient::execute()
+ExprScalarExp::declare_interface(Node &i)
 {
-  string operator_name = "ArrayGradient";
+  i["type_name"] = "expr_scalar_exp";
+  i["port_names"].append() = "arg1";
+  i["output_port"] = "true";
+}
 
- const std::string expr_name  = (*input("expr_name"))["name"].as_string();
+//-----------------------------------------------------------------------------
+bool
+ExprScalarExp::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+{
+  info.reset();
+  bool res = true;
+  return res;
+}
 
-  const conduit::Node *const cache =
-      graph().workspace().registry().fetch("cache");
+//-----------------------------------------------------------------------------
+void
+ExprScalarExp::execute()
+{
+  const conduit::Node *arg1 = input("arg1");
 
-  if(!cache->has_path(expr_name))
-  {
-    ASCENT_ERROR(operator_name + ": unknown identifier "<<  expr_name);
-  }
-  const conduit::Node &history = (*cache)[expr_name];
+  double res = 0.;
+  res = exp((*arg1)["value"].to_float64());
+  conduit::Node *output = new conduit::Node();
+  (*output)["type"] = "double";
+  (*output)["value"] = res;
 
-  const conduit::Node *n_first_absolute_index = input("first_absolute_index");
-  const conduit::Node *n_last_absolute_index = input("last_absolute_index");
-  const conduit::Node *n_first_relative_index = input("first_relative_index");
-  const conduit::Node *n_last_relative_index = input("last_relative_index");
-  const conduit::Node *n_first_absolute_time = input("first_absolute_time");
-  const conduit::Node *n_last_absolute_time = input("last_absolute_time");
-  const conduit::Node *n_first_absolute_cycle = input("first_absolute_cycle");
-  const conduit::Node *n_last_absolute_cycle = input("last_absolute_cycle");
+  resolve_symbol_result(graph(), output, this->name());
+  set_output(output);
+}
 
-  conduit::Node *output = range_values_helper(history,
-                                              n_first_absolute_index,
-                                              n_last_absolute_index,
-                                              n_first_relative_index,
-                                              n_last_relative_index,
-                                              n_first_absolute_time,
-                                              n_last_absolute_time,
-                                              n_first_absolute_cycle,
-                                              n_last_absolute_cycle,
-                                              operator_name,
-                                              "time");
+//*****************************************************************************
+// ExprScalarLog
+//*****************************************************************************
 
-  size_t num_array_elems = (*output)["value"].dtype().number_of_elements();
+//-----------------------------------------------------------------------------
+ExprScalarLog::ExprScalarLog()
+: Filter()
+{
+  // empty
+}
 
-  if(num_array_elems < 2)
-  {
-    double neg_inf[1] = {-std::numeric_limits::infinity()};
-    (*output)["value"].set(neg_inf,1);
-    (*output)["type"] = "array";
-    set_output(output);
-    return;
-  }
+//-----------------------------------------------------------------------------
+ExprScalarLog::~ExprScalarLog()
+{
+  // empty
+}
+
+//-----------------------------------------------------------------------------
+void
+ExprScalarLog::declare_interface(Node &i)
+{
+  i["type_name"] = "expr_scalar_log";
+  i["port_names"].append() = "arg1";
+  i["output_port"] = "true";
+}
 
-  conduit::Node gradient = array_gradient((*output)["value"], (*output)["time"]);
+//-----------------------------------------------------------------------------
+bool
+ExprScalarLog::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+{
+  info.reset();
+  bool res = true;
+  return res;
+}
 
+//-----------------------------------------------------------------------------
+void
+ExprScalarLog::execute()
+{
+  const conduit::Node *arg1 = input("arg1");
 
-  (*output)["value"] = gradient["value"];
-  (*output)["type"] = "array";
+  double res = 0.;
+  res = log((*arg1)["value"].to_float64());
+  conduit::Node *output = new conduit::Node();
+  (*output)["type"] = "double";
+  (*output)["value"] = res;
 
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprScalarPow
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-FieldAvg::FieldAvg() : Filter()
+ExprScalarPow::ExprScalarPow() : Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-FieldAvg::~FieldAvg()
+ExprScalarPow::~ExprScalarPow()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-FieldAvg::declare_interface(Node &i)
+ExprScalarPow::declare_interface(Node &i)
 {
-  i["type_name"] = "field_avg";
+  i["type_name"] = "expr_scalar_pow";
   i["port_names"].append() = "arg1";
+  i["port_names"].append() = "arg2";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-FieldAvg::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprScalarPow::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -1977,56 +1787,63 @@ FieldAvg::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-FieldAvg::execute()
+ExprScalarPow::execute()
 {
   const conduit::Node *arg1 = input("arg1");
+  const conduit::Node *arg2 = input("arg2");
 
-  const std::string field = (*arg1)["value"].as_string();
-
+  double res = 0.;
+  double base = (*arg1)["value"].to_float64();
+  double exponent = (*arg2)["value"].to_float64();
+  res = pow(base, exponent);
   conduit::Node *output = new conduit::Node();
-
-  DataObject *data_object =
-    graph().workspace().registry().fetch("dataset");
-  const conduit::Node *const dataset = data_object->as_low_order_bp().get();
-
-  if(!is_scalar_field(*dataset, field))
-  {
-    ASCENT_ERROR("FieldAvg: field '" << field << "' is not a scalar field");
-  }
-
-  conduit::Node n_avg = field_avg(*dataset, field);
-
-  (*output)["value"] = n_avg["value"];
   (*output)["type"] = "double";
+  (*output)["value"] = res;
 
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
 //-----------------------------------------------------------------------------
-Cycle::Cycle() : Filter()
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// Vector Operations
+//   vector, vector_magnitude
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+//*****************************************************************************
+// ExprVector
+//*****************************************************************************
+
+//-----------------------------------------------------------------------------
+ExprVector::ExprVector()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Cycle::~Cycle()
+ExprVector::~ExprVector()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Cycle::declare_interface(Node &i)
+ExprVector::declare_interface(Node &i)
 {
-  i["type_name"] = "cycle";
-  i["port_names"] = DataType::empty();
+  i["type_name"] = "expr_vector";
+  i["port_names"].append() = "arg1";
+  i["port_names"].append() = "arg2";
+  i["port_names"].append() = "arg3";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Cycle::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprVector::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -2035,52 +1852,55 @@ Cycle::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-Cycle::execute()
+ExprVector::execute()
 {
-  conduit::Node *output = new conduit::Node();
+  const conduit::Node *arg1 = input("arg1");
+  const conduit::Node *arg2 = input("arg2");
+  const conduit::Node *arg3 = input("arg3");
 
-  DataObject *data_object =
-    graph().workspace().registry().fetch("dataset");
-  // we are just getting state so we don't care if its high or low
-  // order
-  const conduit::Node *const dataset = data_object->as_node().get();
+  double vec[3] = {0., 0., 0.};
+  vec[0] = (*arg1)["value"].to_float64();
+  vec[1] = (*arg2)["value"].to_float64();
+  vec[2] = (*arg3)["value"].to_float64();
 
-  conduit::Node state = get_state_var(*dataset, "cycle");
-  if(!state.dtype().is_number())
-  {
-    ASCENT_ERROR("Expressions: cycle() is not a number");
-  }
+  conduit::Node *output = new conduit::Node();
+  (*output)["type"] = "vector";
+  (*output)["value"].set(vec, 3);
 
-  (*output)["type"] = "int";
-  (*output)["value"] = state;
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprVectorMagnitude
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-Time::Time() : Filter()
+ExprVectorMagnitude::ExprVectorMagnitude()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Time::~Time()
+ExprVectorMagnitude::~ExprVectorMagnitude()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Time::declare_interface(Node &i)
+ExprVectorMagnitude::declare_interface(Node &i)
 {
-  i["type_name"] = "time";
-  i["port_names"] = DataType::empty();
+  i["type_name"] = "expr_vector_magnitude";
+  i["port_names"].append() = "arg1";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Time::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprVectorMagnitude::verify_params(const conduit::Node ¶ms,
+                                   conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -2089,54 +1909,60 @@ Time::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-Time::execute()
+ExprVectorMagnitude::execute()
 {
-  conduit::Node *output = new conduit::Node();
-
-  DataObject *data_object =
-    graph().workspace().registry().fetch("dataset");
-  // we are just getting state so we don't care if its high or low
-  // order
-  const conduit::Node *const dataset = data_object->as_node().get();
-
-  conduit::Node state = get_state_var(*dataset, "time");
-  if(!state.dtype().is_number())
-  {
-    ASCENT_ERROR("Expressions: time() is not a number");
-  }
+  const conduit::Node *arg1 = input("arg1");
 
+  double res = 0.;
+  const double *vec = (*arg1)["value"].value();
+  res = sqrt(vec[0] * vec[0] + vec[1] * vec[1] + vec[2] * vec[2]);
+  conduit::Node *output = new conduit::Node();
   (*output)["type"] = "double";
-  (*output)["value"] = state;
+  (*output)["value"] = res;
+
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
 //-----------------------------------------------------------------------------
-History::History() : Filter()
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// Array Operations
+//  access, replace, min, max, avg, sum
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+//*****************************************************************************
+// ExprArrayAccess
+//*****************************************************************************
+
+//-----------------------------------------------------------------------------
+ExprArrayAccess::ExprArrayAccess()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-History::~History()
+ExprArrayAccess::~ExprArrayAccess()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-History::declare_interface(Node &i)
+ExprArrayAccess::declare_interface(Node &i)
 {
-  i["type_name"] = "history";
-  i["port_names"].append() = "expr_name";
-  i["port_names"].append() = "absolute_index";
-  i["port_names"].append() = "relative_index";
+  i["type_name"] = "expr_array_access";
+  i["port_names"].append() = "array";
+  i["port_names"].append() = "index";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-History::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprArrayAccess::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -2145,184 +1971,160 @@ History::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-History::execute()
+ExprArrayAccess::execute()
 {
-  conduit::Node *output = new conduit::Node();
-
-  const std::string expr_name  = (*input("expr_name"))["name"].as_string();
-
-  const conduit::Node *const cache =
-      graph().workspace().registry().fetch("cache");
-
-  if(!cache->has_path(expr_name))
-  {
-    ASCENT_ERROR("History: unknown identifier "<<  expr_name);
-  }
-  const conduit::Node &history = (*cache)[expr_name];
-
-  const conduit::Node *n_absolute_index = input("absolute_index");
-  const conduit::Node *n_relative_index = input("relative_index");
-
-
-  if(!n_absolute_index->dtype().is_empty() &&
-     !n_relative_index->dtype().is_empty())
-  {
-    ASCENT_ERROR(
-        "History: Specify only one of relative_index or absolute_index.");
-  }
+  const conduit::Node *n_array = input("array");
+  const conduit::Node *n_index = input("index");
 
+  conduit::Node *output = new conduit::Node();
 
-  const int entries = history.number_of_children();
-  if(!n_relative_index->dtype().is_empty())
-  {
-    int relative_index = (*n_relative_index)["value"].to_int32();
-    if(relative_index >= entries)
-    {
-      // clamp to first if its gone too far
-      relative_index = 0;
-    }
-    if(relative_index < 0)
-    {
-      ASCENT_ERROR("History: relative_index must be a non-negative integer.");
-    }
-    // grab the value from relative_index cycles ago
-    (*output) = history.child(entries - relative_index - 1);
-  }
-  else
+  int index = (*n_index)["value"].as_int32();
+  int length = (*n_array)["value"].dtype().number_of_elements();
+  if(index > length - 1)
   {
-    int absolute_index = 0;
-
-    if(!n_absolute_index->has_path("value"))
-    {
-      ASCENT_ERROR(
-          "History: internal error. absolute index does not have child value");
-    }
-    absolute_index = (*n_absolute_index)["value"].to_int32();
-
-    if(absolute_index >= entries)
-    {
-      ASCENT_ERROR("History: found only " << entries
-                                          << " entries, cannot get entry at "
-                                          << absolute_index);
-    }
-    if(absolute_index < 0)
-    {
-      ASCENT_ERROR("History: absolute_index must be a non-negative integer.");
-    }
-
-    (*output) = history.child(absolute_index);
+    ASCENT_ERROR("ArrayAccess: array index out of bounds: [0," << length - 1
+                                                               << "]");
   }
+  const double *arr = (*n_array)["value"].value();
+  (*output)["value"] = arr[index];
+  (*output)["type"] = "double";
 
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
 
+//*****************************************************************************
+// ExprArrayReplace
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-HistoryRange::HistoryRange() : Filter()
+ExprArrayReplace::ExprArrayReplace()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-HistoryRange::~HistoryRange()
+ExprArrayReplace::~ExprArrayReplace()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-HistoryRange::declare_interface(Node &i)
+ExprArrayReplace::declare_interface(Node &i)
 {
-  i["type_name"] = "history_range";
-  i["port_names"].append() = "expr_name";
-  i["port_names"].append() = "first_absolute_index";
-  i["port_names"].append() = "last_absolute_index";
-  i["port_names"].append() = "first_relative_index";
-  i["port_names"].append() = "last_relative_index";
-  i["port_names"].append() = "first_absolute_time";
-  i["port_names"].append() = "last_absolute_time";
-  i["port_names"].append() = "first_absolute_cycle";
-  i["port_names"].append() = "last_absolute_cycle";
+  i["type_name"] = "expr_array_replace";
+  i["port_names"].append() = "arg1";
+  i["port_names"].append() = "find";
+  i["port_names"].append() = "replace";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-HistoryRange::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprArrayReplace::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
   return res;
 }
 
-
 //-----------------------------------------------------------------------------
 void
-HistoryRange::execute()
+ExprArrayReplace::execute()
 {
-  const string operator_name = "HistoryRange";
-  const std::string expr_name  = (*input("expr_name"))["name"].as_string();
+  const conduit::Node *n_array= input("arg1");
+  const conduit::Node *n_find = input("find");
+  const conduit::Node *n_replace = input("replace");
 
-  const conduit::Node *const cache =
-      graph().workspace().registry().fetch("cache");
+  if(n_array->fetch_existing("type").as_string() != "array")
+  {
+    ASCENT_ERROR("replace is not an array");
+  }
 
-  if(!cache->has_path(expr_name))
+  if(n_find->fetch_existing("type").as_string() != "double")
   {
-    ASCENT_ERROR(operator_name + ": unknown identifier "<<  expr_name);
+    ASCENT_ERROR("'find' is not a double");
   }
-  const conduit::Node &history = (*cache)[expr_name];
 
-  const conduit::Node *n_first_absolute_index = input("first_absolute_index");
-  const conduit::Node *n_last_absolute_index = input("last_absolute_index");
-  const conduit::Node *n_first_relative_index = input("first_relative_index");
-  const conduit::Node *n_last_relative_index = input("last_relative_index");
-  const conduit::Node *n_first_absolute_time = input("first_absolute_time");
-  const conduit::Node *n_last_absolute_time = input("last_absolute_time");
-  const conduit::Node *n_first_absolute_cycle = input("first_absolute_cycle");
-  const conduit::Node *n_last_absolute_cycle = input("last_absolute_cycle");
+  if(n_replace->fetch_existing("type").as_string() != "double")
+  {
+    ASCENT_ERROR("'replace' is not a double");
+  }
+
+  conduit::Node *output = new conduit::Node();
+  // copy the input into the ouptut
+  *output = *n_array;
+  conduit::Node &array = output->fetch_existing("value");
+
+  if(!array.dtype().is_float64())
+  {
+    ASCENT_ERROR("Replace is only implemented for doubles");
+  }
+
+  const int size = array.dtype().number_of_elements();
+  conduit::float64 *ptr =  array.as_float64_ptr();
+  const double find = n_find->fetch_existing("value").to_float64();
+  const double replace = n_replace->fetch_existing("value").to_float64();
+
+  bool find_nan = find != find;
 
-  conduit::Node *output = range_values_helper(history,
-                                              n_first_absolute_index,
-                                              n_last_absolute_index,
-                                              n_first_relative_index,
-                                              n_last_relative_index,
-                                              n_first_absolute_time,
-                                              n_last_absolute_time,
-                                              n_first_absolute_cycle,
-                                              n_last_absolute_cycle,
-                                              operator_name);
+  if( !find_nan)
+  {
+    for(int i = 0; i < size; ++i)
+    {
+      if(ptr[i] == find)
+      {
+        ptr[i] = replace;
+      }
+    }
+  }
+  else
+  {
+    for(int i = 0; i < size; ++i)
+    {
+      if(ptr[i] != ptr[i])
+      {
+        ptr[i] = replace;
+      }
+    }
+  }
 
   set_output(output);
 }
 
 
+//*****************************************************************************
+// ExprArrayReductionMin
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-Vector::Vector() : Filter()
+ExprArrayReductionMin::ExprArrayReductionMin()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Vector::~Vector()
+ExprArrayReductionMin::~ExprArrayReductionMin()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Vector::declare_interface(Node &i)
+ExprArrayReductionMin::declare_interface(Node &i)
 {
-  i["type_name"] = "vector";
+  i["type_name"] = "expr_array_reduction_min";
   i["port_names"].append() = "arg1";
-  i["port_names"].append() = "arg2";
-  i["port_names"].append() = "arg3";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Vector::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprArrayReductionMin::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -2331,49 +2133,46 @@ Vector::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-Vector::execute()
+ExprArrayReductionMin::execute()
 {
-  const conduit::Node *arg1 = input("arg1");
-  const conduit::Node *arg2 = input("arg2");
-  const conduit::Node *arg3 = input("arg3");
-
-  double vec[3] = {0., 0., 0.};
-  vec[0] = (*arg1)["value"].to_float64();
-  vec[1] = (*arg2)["value"].to_float64();
-  vec[2] = (*arg3)["value"].to_float64();
-
   conduit::Node *output = new conduit::Node();
-  (*output)["type"] = "vector";
-  (*output)["value"].set(vec, 3);
+  std::string exec = ExecutionManager::preferred_cpu_policy();
+  (*output)["value"] = array_min((*input("arg1"))["value"], exec)["value"];
+  (*output)["type"] = "double";
 
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprArrayReductionMax
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-Magnitude::Magnitude() : Filter()
+ExprArrayReductionMax::ExprArrayReductionMax()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Magnitude::~Magnitude()
+ExprArrayReductionMax::~ExprArrayReductionMax()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Magnitude::declare_interface(Node &i)
+ExprArrayReductionMax::declare_interface(Node &i)
 {
-  i["type_name"] = "magnitude";
+  i["type_name"] = "expr_array_reduction_max";
   i["port_names"].append() = "arg1";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Magnitude::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprArrayReductionMax::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -2382,45 +2181,46 @@ Magnitude::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-Magnitude::execute()
+ExprArrayReductionMax::execute()
 {
-  const conduit::Node *arg1 = input("arg1");
-
-  double res = 0.;
-  const double *vec = (*arg1)["value"].value();
-  res = sqrt(vec[0] * vec[0] + vec[1] * vec[1] + vec[2] * vec[2]);
   conduit::Node *output = new conduit::Node();
+  std::string exec = ExecutionManager::preferred_cpu_policy();
+  (*output)["value"] = array_max((*input("arg1"))["value"], exec)["value"];
   (*output)["type"] = "double";
-  (*output)["value"] = res;
 
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprArrayReductionAvg
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-Abs::Abs() : Filter()
+ExprArrayReductionAvg::ExprArrayReductionAvg()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Abs::~Abs()
+ExprArrayReductionAvg::~ExprArrayReductionAvg()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Abs::declare_interface(Node &i)
+ExprArrayReductionAvg::declare_interface(Node &i)
 {
-  i["type_name"] = "abs";
+  i["type_name"] = "expr_array_reduction_avg";
   i["port_names"].append() = "arg1";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Abs::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprArrayReductionAvg::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -2429,58 +2229,46 @@ Abs::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-Abs::execute()
+ExprArrayReductionAvg::execute()
 {
-  const conduit::Node *arg1 = input("arg1");
-
-  if((*arg1)["type"].as_string() == "double")
-  {
-    double res = 0.;
-    res = abs((*arg1)["value"].to_float64());
-    conduit::Node *output = new conduit::Node();
-    (*output)["type"] = "double";
-    (*output)["value"] = res;
-
-    resolve_symbol_result(graph(), output, this->name());
-    set_output(output);
-  }
-  else
-  {
-    int res = 0;
-    res = abs((*arg1)["value"].to_int32());
-    conduit::Node *output = new conduit::Node();
-    (*output)["type"] = "int";
-    (*output)["value"] = res;
+  conduit::Node *output = new conduit::Node();
+  std::string exec = ExecutionManager::preferred_cpu_policy();
+  conduit::Node sum = array_sum((*input("arg1"))["value"], exec);
+  (*output)["value"] = sum["value"].to_float64() / sum["count"].to_float64();
+  (*output)["type"] = "double";
 
-    resolve_symbol_result(graph(), output, this->name());
-    set_output(output);
-  }
+  set_output(output);
 }
 
+//*****************************************************************************
+// ExprArrayReductionAvg
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-Exp::Exp() : Filter()
+ExprArrayReductionSum::ExprArrayReductionSum()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Exp::~Exp()
+ExprArrayReductionSum::~ExprArrayReductionSum()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Exp::declare_interface(Node &i)
+ExprArrayReductionSum::declare_interface(Node &i)
 {
-  i["type_name"] = "exp";
+  i["type_name"] = "expr_array_reduction_sum";
   i["port_names"].append() = "arg1";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Exp::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprArrayReductionSum::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -2489,91 +2277,57 @@ Exp::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-Exp::execute()
+ExprArrayReductionSum::execute()
 {
-  const conduit::Node *arg1 = input("arg1");
-
-  double res = 0.;
-  res = exp((*arg1)["value"].to_float64());
   conduit::Node *output = new conduit::Node();
+  std::string exec = ExecutionManager::preferred_cpu_policy();
+  (*output)["value"] = array_sum((*input("arg1"))["value"], exec)["value"];
   (*output)["type"] = "double";
-  (*output)["value"] = res;
 
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
 //-----------------------------------------------------------------------------
-Log::Log() : Filter()
-{
-  // empty
-}
-
 //-----------------------------------------------------------------------------
-Log::~Log()
-{
-  // empty
-}
-
 //-----------------------------------------------------------------------------
-void
-Log::declare_interface(Node &i)
-{
-  i["type_name"] = "log";
-  i["port_names"].append() = "arg1";
-  i["output_port"] = "true";
-}
-
+// History Operations
+//  history, history_range, history_gradient, history_range_gradient
+//-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
-bool
-Log::verify_params(const conduit::Node ¶ms, conduit::Node &info)
-{
-  info.reset();
-  bool res = true;
-  return res;
-}
-
 //-----------------------------------------------------------------------------
-void
-Log::execute()
-{
-  const conduit::Node *arg1 = input("arg1");
-
-  double res = 0.;
-  res = log((*arg1)["value"].to_float64());
-  conduit::Node *output = new conduit::Node();
-  (*output)["type"] = "double";
-  (*output)["value"] = res;
 
-  resolve_symbol_result(graph(), output, this->name());
-  set_output(output);
-}
+//*****************************************************************************
+// ExprHistory
+//*****************************************************************************
 
 //-----------------------------------------------------------------------------
-Pow::Pow() : Filter()
+ExprHistory::ExprHistory()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Pow::~Pow()
+ExprHistory::~ExprHistory()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Pow::declare_interface(Node &i)
+ExprHistory::declare_interface(Node &i)
 {
-  i["type_name"] = "pow";
-  i["port_names"].append() = "arg1";
-  i["port_names"].append() = "arg2";
+  i["type_name"] = "expr_history";
+  i["port_names"].append() = "expr_name";
+  i["port_names"].append() = "absolute_index";
+  i["port_names"].append() = "relative_index";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Pow::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprHistory::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -2582,171 +2336,192 @@ Pow::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-Pow::execute()
+ExprHistory::execute()
 {
-  const conduit::Node *arg1 = input("arg1");
-  const conduit::Node *arg2 = input("arg2");
-
-  double res = 0.;
-  double base = (*arg1)["value"].to_float64();
-  double exponent = (*arg2)["value"].to_float64();
-  res = pow(base, exponent);
   conduit::Node *output = new conduit::Node();
-  (*output)["type"] = "double";
-  (*output)["value"] = res;
+
+  const std::string expr_name  = (*input("expr_name"))["name"].as_string();
+
+  const conduit::Node *const cache =
+      graph().workspace().registry().fetch("cache");
+
+  if(!cache->has_path(expr_name))
+  {
+    ASCENT_ERROR("History: unknown identifier "<<  expr_name);
+  }
+  const conduit::Node &history = (*cache)[expr_name];
+
+  const conduit::Node *n_absolute_index = input("absolute_index");
+  const conduit::Node *n_relative_index = input("relative_index");
+
+
+  if(!n_absolute_index->dtype().is_empty() &&
+     !n_relative_index->dtype().is_empty())
+  {
+    ASCENT_ERROR(
+        "History: Specify only one of relative_index or absolute_index.");
+  }
+
+
+  const int entries = history.number_of_children();
+  if(!n_relative_index->dtype().is_empty())
+  {
+    int relative_index = (*n_relative_index)["value"].to_int32();
+    if(relative_index >= entries)
+    {
+      // clamp to first if its gone too far
+      relative_index = 0;
+    }
+    if(relative_index < 0)
+    {
+      ASCENT_ERROR("History: relative_index must be a non-negative integer.");
+    }
+    // grab the value from relative_index cycles ago
+    (*output) = history.child(entries - relative_index - 1);
+  }
+  else
+  {
+    int absolute_index = 0;
+
+    if(!n_absolute_index->has_path("value"))
+    {
+      ASCENT_ERROR(
+          "History: internal error. absolute index does not have child value");
+    }
+    absolute_index = (*n_absolute_index)["value"].to_int32();
+
+    if(absolute_index >= entries)
+    {
+      ASCENT_ERROR("History: found only " << entries
+                                          << " entries, cannot get entry at "
+                                          << absolute_index);
+    }
+    if(absolute_index < 0)
+    {
+      ASCENT_ERROR("History: absolute_index must be a non-negative integer.");
+    }
+
+    (*output) = history.child(absolute_index);
+  }
 
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprHistoryRange
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-Field::Field() : Filter()
+ExprHistoryRange::ExprHistoryRange()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Field::~Field()
+ExprHistoryRange::~ExprHistoryRange()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Field::declare_interface(Node &i)
+ExprHistoryRange::declare_interface(Node &i)
 {
-  i["type_name"] = "field";
-  i["port_names"].append() = "field_name";
-  i["port_names"].append() = "component";
+  i["type_name"] = "expr_history_range";
+  i["port_names"].append() = "expr_name";
+  i["port_names"].append() = "first_absolute_index";
+  i["port_names"].append() = "last_absolute_index";
+  i["port_names"].append() = "first_relative_index";
+  i["port_names"].append() = "last_relative_index";
+  i["port_names"].append() = "first_absolute_time";
+  i["port_names"].append() = "last_absolute_time";
+  i["port_names"].append() = "first_absolute_cycle";
+  i["port_names"].append() = "last_absolute_cycle";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Field::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprHistoryRange::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
-  return res;
-}
-
-//-----------------------------------------------------------------------------
-void
-Field::execute()
-{
-  const conduit::Node *n_field_name = input("field_name");
-  std::string field_name = (*n_field_name)["value"].as_string();
-
-  // optional parameters
-  const conduit::Node *n_component = input("component");
-
-  if(!graph().workspace().registry().has_entry("dataset"))
-  {
-    ASCENT_ERROR("Field: Missing dataset");
-  }
-
-  DataObject *data_object =
-    graph().workspace().registry().fetch("dataset");
-  const conduit::Node *const dataset = data_object->as_low_order_bp().get();
-
-  if(!has_field(*dataset, field_name))
-  {
-    std::string known;
-    if(dataset->number_of_children() > 0 )
-    {
-      std::vector names = dataset->child(0)["fields"].child_names();
-      std::stringstream ss;
-      ss << "[";
-      for(size_t i = 0; i < names.size(); ++i)
-      {
-        ss << " '" << names[i]<<"'";
-      }
-      ss << "]";
-      known = ss.str();
-    }
-    ASCENT_ERROR("Field: dataset does not contain field '"
-                 << field_name << "'"
-                 << " known = " << known);
-  }
-
-  std::string component;
-  if(!n_component->dtype().is_empty())
-  {
-    component = (*n_component)["value"].as_string();
-    if(!has_component(*dataset, field_name, component))
-    {
-      ASCENT_ERROR("Field variable '"
-                   << field_name << "'"
-                   << " does not have component '" << component << "'."
-                   << " known components = "
-                   << possible_components(*dataset, field_name));
-    }
-  }
-
-  // at this point, we know that the field exists.
-  // If the the field has only one component then we
-  // don't require that the name be provide, but the
-  // code will need the name.
+  return res;
+}
 
 
-  // if the field only has one component use that
-  if(component.empty())
-  {
+//-----------------------------------------------------------------------------
+void
+ExprHistoryRange::execute()
+{
+  const string operator_name = "HistoryRange";
+  const std::string expr_name  = (*input("expr_name"))["name"].as_string();
 
-    int num_comps = num_components(*dataset, field_name);
-    if(num_comps == 1)
-    {
-      const int comp_idx = 0;
-      component = component_name(*dataset, field_name, comp_idx);
-    }
-    else if(num_comps == 0)
-    {
-      // default name for empty path
-      component = "";
-    }
-  }
+  const conduit::Node *const cache =
+      graph().workspace().registry().fetch("cache");
 
-  conduit::Node *output = new conduit::Node();
-  (*output)["value"] = field_name;
-  if(!component.empty())
+  if(!cache->has_path(expr_name))
   {
-    (*output)["component"] = component;
+    ASCENT_ERROR(operator_name + ": unknown identifier "<<  expr_name);
   }
-  (*output)["type"] = "field";
+  const conduit::Node &history = (*cache)[expr_name];
+
+  const conduit::Node *n_first_absolute_index = input("first_absolute_index");
+  const conduit::Node *n_last_absolute_index  = input("last_absolute_index");
+  const conduit::Node *n_first_relative_index = input("first_relative_index");
+  const conduit::Node *n_last_relative_index  = input("last_relative_index");
+  const conduit::Node *n_first_absolute_time  = input("first_absolute_time");
+  const conduit::Node *n_last_absolute_time   = input("last_absolute_time");
+  const conduit::Node *n_first_absolute_cycle = input("first_absolute_cycle");
+  const conduit::Node *n_last_absolute_cycle  = input("last_absolute_cycle");
+
+  conduit::Node *output = detail::range_values_helper(history,
+                                                      n_first_absolute_index,
+                                                      n_last_absolute_index,
+                                                      n_first_relative_index,
+                                                      n_last_relative_index,
+                                                      n_first_absolute_time,
+                                                      n_last_absolute_time,
+                                                      n_first_absolute_cycle,
+                                                      n_last_absolute_cycle,
+                                                      operator_name);
 
-  resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprHistoryGradient
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-Axis::Axis() : Filter()
+ExprHistoryGradient::ExprHistoryGradient()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Axis::~Axis()
+ExprHistoryGradient::~ExprHistoryGradient()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Axis::declare_interface(Node &i)
+ExprHistoryGradient::declare_interface(Node &i)
 {
-  i["type_name"] = "axis";
-  i["port_names"].append() = "name";
-  i["port_names"].append() = "min_val";
-  i["port_names"].append() = "max_val";
-  i["port_names"].append() = "num_bins";
-  i["port_names"].append() = "bins";
-  i["port_names"].append() = "clamp";
+  i["type_name"] = "expr_history_gradient";
+  i["port_names"].append() = "expr_name";
+  i["port_names"].append() = "window_length";
+  i["port_names"].append() = "window_length_unit";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Axis::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprHistoryGradient::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -2755,497 +2530,424 @@ Axis::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-Axis::execute()
+ExprHistoryGradient::execute()
 {
-  const std::string name = (*input("name"))["value"].as_string();
-  // uniform binning
-  const conduit::Node *n_min = input("min_val");
-  const conduit::Node *n_max = input("max_val");
-  const conduit::Node *n_num_bins = input("num_bins");
-  // rectilinear binning
-  const conduit::Node *n_bins_list_obj = input("bins");
-  // clamp
-  const conduit::Node *n_clamp = input("clamp");
+  conduit::Node *output = new conduit::Node();
+  const std::string expr_name  = (*input("expr_name"))["name"].as_string();
+  conduit::Node &n_window_length = *input("window_length");
+  conduit::Node &n_window_length_unit = *input("window_length_unit");
 
-  if(!graph().workspace().registry().has_entry("dataset"))
+  const conduit::Node *const cache =
+      graph().workspace().registry().fetch("cache");
+
+  if(!cache->has_path(expr_name))
   {
-    ASCENT_ERROR("Field: Missing dataset");
+    ASCENT_ERROR("ScalarGradient: unknown identifier "<<  expr_name);
   }
 
-  DataObject *data_object =
-    graph().workspace().registry().fetch("dataset");
-  const conduit::Node *const dataset = data_object->as_low_order_bp().get();
+  // handle the optional inputs
+  double window_length = 1;
+  if(!n_window_length.dtype().is_empty())
+  {
+    window_length = n_window_length["value"].to_float64();
+  }
+  if(window_length < 0)
+  {
+     ASCENT_ERROR("ScalarGradient: window_length must non-negative." );
+  }
 
-  if(!is_scalar_field(*dataset, name) && !is_xyz(name))
+  string units = "index";
+  if(!n_window_length_unit.dtype().is_empty())
   {
-    std::string known;
-    if(dataset->number_of_children() > 0 )
-    {
-      std::vector names = dataset->child(0)["fields"].child_names();
-      std::stringstream ss;
-      ss << "[";
-      for(size_t i = 0; i < names.size(); ++i)
-      {
-        ss << " '" << names[i]<<"'";
-      }
-      ss << "]";
-      known = ss.str();
-    }
+    units = n_window_length_unit["value"].as_string();
+  }
 
-    ASCENT_ERROR("Axis: Axes must be scalar fields or x/y/z. Dataset does not "
-                 "contain scalar field '"
-                 << name << "'. Possible field names "<dtype().is_empty())
+  if((execution_points || cycles) && window_length < 1) {
+     ASCENT_ERROR("HistoryGradient: window_length must be at least 1 if the window length unit is \"index\" or \"cycle\"." );
+  }
+
+  const conduit::Node &history = (*cache)[expr_name];
+
+  const int entries = history.number_of_children();
+  if(entries < 2)
   {
-    const conduit::Node &n_bins_list = (*n_bins_list_obj)["value"];
-    // ensure none of the uniform binning arguments are passed
-    if(!n_min->dtype().is_empty() || !n_max->dtype().is_empty() ||
-       !n_num_bins->dtype().is_empty())
+    (*output)["value"] = -std::numeric_limits::infinity();
+    (*output)["type"] = "double";
+    set_output(output);
+    return;
+  }
+
+  int first_index = 0, current_index = entries - 1;
+  if(execution_points)
+  {
+    //clamp the first index if the window length has gone too far
+    if(window_length - current_index > 0)
     {
-      ASCENT_ERROR("Axis: Only pass in arguments for uniform or rectilinear "
-                   "binning, not both.");
+      first_index = 0;
+      window_length = current_index;
     }
-
-    int bins_len = n_bins_list.number_of_children();
-
-    if(bins_len < 2)
+    else
     {
-      ASCENT_ERROR("Axis: bins must have at least 2 items.");
+      first_index = current_index - window_length;
     }
-
-    output = new conduit::Node();
-    (*output)["value/" + name + "/bins"].set(
-        conduit::DataType::c_double(bins_len));
-    double *bins = (*output)["value/" + name + "/bins"].value();
-
-    for(int i = 0; i < bins_len; ++i)
+  }
+  else if(time)
+  {
+   string time_path = "time";
+   if(!history.child(current_index).has_path(time_path))
     {
-      const conduit::Node &bin = n_bins_list.child(i);
-      if(!detail::is_scalar(bin["type"].as_string()))
+      ASCENT_ERROR("HistoryGradient: internal error. current time point does not have the child " + time_path);
+    }
+    const double current_time = history.child(current_index)[time_path].to_float64();
+    const double first_time = current_time - window_length;
+    double time;
+    for(int index = 0; index < entries; index++)
+    {
+      if(history.child(index).has_path(time_path))
       {
-        delete output;
-        ASCENT_ERROR("Axis: bins must be a list of scalars.");
+        time = history.child(index)[time_path].to_float64();
       }
-      bins[i] = bin["value"].to_float64();
-      if(i != 0 && bins[i - 1] >= bins[i])
+      else
       {
-        delete output;
-        ASCENT_ERROR("Axis: bins of strictly increasing scalars.");
+        ASCENT_ERROR("HistoryGradient: a time point in evaluation window (for the calculation at absolute index: " + to_string(index) + ") does not have the child " + time_path );
+      }
+      if(time >= first_time) {
+        first_index = index;
+        //adjust so our window length is accurate (since we may not have performed a calculation at precisely the requested time)
+        window_length = current_time - time;
+        break;
       }
     }
   }
-  else
+  else if(cycles)
   {
-    output = new conduit::Node();
-
-    // Normally, we would do all the error checking here/ determined
-    // the mins and maxs, but there are some issues. Since we are
-    // merely an axis , which is part of data binning, we are not
-    // aware of the field that the binning is on. Thus, we can't
-    // automatically figure out the spatial min/max since
-    // we don't know the topoloy. Thus we will defer the error
-    // checking to the actual binning code.
-    double min_val;
-    bool min_found = false;
-    if(!n_min->dtype().is_empty())
+    vector child_names = history.child_names();
+    if(child_names.size() != entries)
     {
-      min_val = (*n_min)["value"].to_float64();
-      (*output)["value/" + name + "/min_val"] = min_val;
-      min_found = true;
+      ASCENT_ERROR("HistoryGradient: internal error. number of history "
+                   <<"entries: " << to_string(entries)
+                   <<", but number of history child names: "
+                   <dtype().is_empty())
+    unsigned long long cycle;
+    for(int index = 0; index < entries; index++)
     {
-      max_val = (*n_max)["value"].to_float64();
-      max_found = true;
-      (*output)["value/" + name + "/max_val"] = max_val;
+      cycle = stoull(child_names[index]);
+      if(cycle >= first_cycle)
+      {
+        first_index = index;
+        //adjust so our window length is accurate (since we may not have performed a calculation at precisely the requested time)
+        window_length = current_cycle - cycle;
+        break;
+      }
     }
+  }
 
-    // default num bins
-    (*output)["value/" + name + "/num_bins"] = 256;
-
-    if(!n_num_bins->dtype().is_empty())
+  string value_path = "";
+  vector value_paths = {"value", "attrs/value/value"};
+  if(current_index < 0 || current_index >= entries)
+  {
+    ASCENT_ERROR("HistoryGradient: bad current index: "<= max_val)
-    {
-      delete output;
-      ASCENT_ERROR("Axis: axis with name '"
-                   << name << "': min_val (" << min_val
-                   << ") must be smaller than max_val (" << max_val << ")");
-    }
+  if(value_path.size() == 0)
+  {
+    ASCENT_ERROR("HistoryGradient: internal error. current index does not "
+                  <<"have one of the expected value paths");
   }
 
-  (*output)["value/" + name + "/clamp"] = 0;
-  if(!n_clamp->dtype().is_empty())
+  if(first_index < 0 || first_index >= entries)
   {
-    (*output)["value/" + name + "/clamp"] = (*n_clamp)["value"].to_int32();
+    ASCENT_ERROR("HistoryGradient: bad first index: "<(output);
 }
 
+
 //-----------------------------------------------------------------------------
-Histogram::Histogram() : Filter()
+ExprHistoryGradientRange::ExprHistoryGradientRange()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Histogram::~Histogram()
+ExprHistoryGradientRange::~ExprHistoryGradientRange()
 {
   // empty
 }
 
-//-----------------------------------------------------------------------------
+
+// -----------------------------------------------------------------------------
 void
-Histogram::declare_interface(Node &i)
+ExprHistoryGradientRange::declare_interface(Node &i)
 {
-  i["type_name"] = "histogram";
-  i["port_names"].append() = "arg1";
-  i["port_names"].append() = "num_bins";
-  i["port_names"].append() = "min_val";
-  i["port_names"].append() = "max_val";
+  i["type_name"] = "expr_history_gradient_range";
+  i["port_names"].append() = "expr_name";
+  i["port_names"].append() = "first_absolute_index";
+  i["port_names"].append() = "last_absolute_index";
+  i["port_names"].append() = "first_relative_index";
+  i["port_names"].append() = "last_relative_index";
+  i["port_names"].append() = "first_absolute_time";
+  i["port_names"].append() = "last_absolute_time";
+  i["port_names"].append() = "first_absolute_cycle";
+  i["port_names"].append() = "last_absolute_cycle";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Histogram::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprHistoryGradientRange::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
   return res;
 }
 
+
 //-----------------------------------------------------------------------------
 void
-Histogram::execute()
+ExprHistoryGradientRange::execute()
 {
-  const conduit::Node *arg1 = input("arg1");
-  // optional inputs
-  const conduit::Node *n_bins = input("num_bins");
-  const conduit::Node *n_max = input("max_val");
-  const conduit::Node *n_min = input("min_val");
+  string operator_name = "HistoryGradientRange";
 
-  const std::string field = (*arg1)["value"].as_string();
+  const std::string expr_name  = (*input("expr_name"))["name"].as_string();
 
-  DataObject *data_object =
-    graph().workspace().registry().fetch("dataset");
-  const conduit::Node *const dataset = data_object->as_low_order_bp().get();
+  const conduit::Node *const cache =
+      graph().workspace().registry().fetch("cache");
 
-  if(!is_scalar_field(*dataset, field))
+  if(!cache->has_path(expr_name))
   {
-    ASCENT_ERROR("Histogram: axis for histogram must be a scalar field. "
-                 "Invalid axis field: '"
-                 << field << "'.");
+    ASCENT_ERROR(operator_name + ": unknown identifier "<<  expr_name);
   }
+  const conduit::Node &history = (*cache)[expr_name];
 
-  // handle the optional inputs
-  int num_bins = 256;
-  if(!n_bins->dtype().is_empty())
-  {
-    num_bins = (*n_bins)["value"].as_int32();
-  }
+  const conduit::Node *n_first_absolute_index = input("first_absolute_index");
+  const conduit::Node *n_last_absolute_index = input("last_absolute_index");
+  const conduit::Node *n_first_relative_index = input("first_relative_index");
+  const conduit::Node *n_last_relative_index = input("last_relative_index");
+  const conduit::Node *n_first_absolute_time = input("first_absolute_time");
+  const conduit::Node *n_last_absolute_time = input("last_absolute_time");
+  const conduit::Node *n_first_absolute_cycle = input("first_absolute_cycle");
+  const conduit::Node *n_last_absolute_cycle = input("last_absolute_cycle");
 
-  double min_val;
-  double max_val;
+  conduit::Node *output = detail::range_values_helper(history,
+                                                      n_first_absolute_index,
+                                                      n_last_absolute_index,
+                                                      n_first_relative_index,
+                                                      n_last_relative_index,
+                                                      n_first_absolute_time,
+                                                      n_last_absolute_time,
+                                                      n_first_absolute_cycle,
+                                                      n_last_absolute_cycle,
+                                                      operator_name,
+                                                      "time");
 
-  if(!n_max->dtype().is_empty())
-  {
-    max_val = (*n_max)["value"].to_float64();
-  }
-  else
-  {
-    max_val = field_max(*dataset, field)["value"].to_float64();
-  }
+  size_t num_array_elems = (*output)["value"].dtype().number_of_elements();
 
-  if(!n_min->dtype().is_empty())
-  {
-    min_val = (*n_min)["value"].to_float64();
-  }
-  else
+  if(num_array_elems < 2)
   {
-    min_val = field_min(*dataset, field)["value"].to_float64();
+    double neg_inf[1] = {-std::numeric_limits::infinity()};
+    (*output)["value"].set(neg_inf,1);
+    (*output)["type"] = "array";
+    set_output(output);
+    return;
   }
 
-  if(min_val >= max_val)
-  {
-    ASCENT_ERROR("Histogram: min value ("
-                 << min_val << ") must be smaller than max (" << max_val
-                 << ")");
-  }
+  conduit::Node gradient = history_gradient_range((*output)["value"], (*output)["time"]);
 
-  conduit::Node *output = new conduit::Node();
-  (*output)["type"] = "histogram";
-  (*output)["attrs/value/value"] =
-      field_histogram(*dataset, field, min_val, max_val, num_bins)["value"];
-  (*output)["attrs/value/type"] = "array";
-  (*output)["attrs/min_val/value"] = min_val;
-  (*output)["attrs/min_val/type"] = "double";
-  (*output)["attrs/max_val/value"] = max_val;
-  (*output)["attrs/max_val/type"] = "double";
-  (*output)["attrs/num_bins/value"] = num_bins;
-  (*output)["attrs/num_bins/type"] = "int";
-  (*output)["attrs/clamp/value"] = true;
-  (*output)["attrs/clamp/type"] = "bool";
+
+  (*output)["value"] = gradient["value"];
+  (*output)["type"] = "array";
 
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
 //-----------------------------------------------------------------------------
-Binning::Binning() : Filter()
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// Histogram Operations
+// histogram, entropy, pdf, cdf, quantile, bin_by_value, bin_by_index
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+//*****************************************************************************
+// ExprHistogram
+//*****************************************************************************
+
+//-----------------------------------------------------------------------------
+ExprHistogram::ExprHistogram()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Binning::~Binning()
+ExprHistogram::~ExprHistogram()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Binning::declare_interface(Node &i)
+ExprHistogram::declare_interface(Node &i)
 {
-  i["type_name"] = "binning";
-  i["port_names"].append() = "reduction_var";
-  i["port_names"].append() = "reduction_op";
-  i["port_names"].append() = "bin_axes";
-  i["port_names"].append() = "empty_bin_val";
-  i["port_names"].append() = "component";
+  i["type_name"] = "expr_histogram";
+  i["port_names"].append() = "arg1";
+  i["port_names"].append() = "num_bins";
+  i["port_names"].append() = "min_val";
+  i["port_names"].append() = "max_val";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Binning::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprHistogram::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
   return res;
 }
 
-void binning_interface(const std::string &reduction_var,
-                       const std::string &reduction_op,
-                       const conduit::Node &n_empty_bin_val,
-                       const conduit::Node &n_component,
-                       const conduit::Node &n_axis_list,
-                       conduit::Node &dataset,
-                       conduit::Node &n_binning,
-                       conduit::Node &n_output_axes)
-{
-  std::string component = "";
-  if(!n_component.dtype().is_empty())
-  {
-    component = n_component["value"].as_string();
-  }
-
-  if(!n_axis_list.has_path("type"))
-  {
-    ASCENT_ERROR("Binning: axis list missing object type.");
-  }
-  std::string obj_type = n_axis_list["type"].as_string();
-  if(obj_type != "list")
-  {
-    ASCENT_ERROR("Binning: axis list is not type 'list'."
-                  <<" type is '"< 0 )
-      {
-        std::vector names = dataset.child(0)["fields"].child_names();
-        std::stringstream ss;
-        ss << "[";
-        for(size_t i = 0; i < names.size(); ++i)
-        {
-          ss << " '" << names[i]<<"'";
-        }
-        ss << "]";
-        known = ss.str();
-      }
-      ASCENT_ERROR("Binning: reduction variable '"
-                   << reduction_var
-                   << "' must be a scalar field in the dataset or x/y/z or empty."
-                   << " known = " << known);
-    }
-
-    bool scalar = is_scalar_field(dataset, reduction_var);
-    if(!scalar && component == "")
-    {
-      ASCENT_ERROR("Binning: reduction variable '"
-                   << reduction_var <<"'"
-                   << " has multiple components and no 'component' is"
-                   << " specified."
-                   << " known components = "
-                   << possible_components(dataset, reduction_var));
-    }
-    if(scalar && component != "")
-    {
-      ASCENT_ERROR("Binning: reduction variable '"
-                   << reduction_var <<"'"
-                   << " is a scalar(i.e., has not components "
-                   << " but 'component' " << " '"<> bindexes;
-  // n_binning = data_binning(dataset,
-  //                          n_output_axes,
-  //                          reduction_var,
-  //                          reduction_op,
-  //                          empty_bin_val,
-  //                          component,
-  //                          bindexes);
-
-}
 //-----------------------------------------------------------------------------
 void
-Binning::execute()
+ExprHistogram::execute()
 {
+  const conduit::Node *arg1 = input("arg1");
+  // optional inputs
+  const conduit::Node *n_bins = input("num_bins");
+  const conduit::Node *n_max = input("max_val");
+  const conduit::Node *n_min = input("min_val");
+
+  const std::string field = (*arg1)["value"].as_string();
+
   DataObject *data_object =
     graph().workspace().registry().fetch("dataset");
+  const conduit::Node *const dataset = data_object->as_low_order_bp().get();
 
-  conduit::Node *dataset = data_object->as_low_order_bp().get();
+  if(!is_scalar_field(*dataset, field))
+  {
+    ASCENT_ERROR("Histogram: axis for histogram must be a scalar field. "
+                 "Invalid axis field: '"
+                 << field << "'.");
+  }
 
-  const std::string reduction_var =
-      (*input("reduction_var"))["value"].as_string();
-  const std::string reduction_op =
-      (*input("reduction_op"))["value"].as_string();
-  const conduit::Node *n_axes_list = input("bin_axes");
-  // optional arguments
-  const conduit::Node *n_empty_bin_val = input("empty_bin_val");
-  const conduit::Node *n_component = input("component");
+  // handle the optional inputs
+  int num_bins = 256;
+  if(!n_bins->dtype().is_empty())
+  {
+    num_bins = (*n_bins)["value"].as_int32();
+  }
 
-  conduit::Node n_binning;
-  conduit::Node n_bin_axes;
+  double min_val;
+  double max_val;
 
-  binning_interface(reduction_var,
-                    reduction_op,
-                    *n_empty_bin_val,
-                    *n_component,
-                    *n_axes_list,
-                    *dataset,
-                    n_binning,
-                    n_bin_axes);
+  if(!n_max->dtype().is_empty())
+  {
+    max_val = (*n_max)["value"].to_float64();
+  }
+  else
+  {
+    max_val = field_max(*dataset, field)["value"].to_float64();
+  }
+
+  if(!n_min->dtype().is_empty())
+  {
+    min_val = (*n_min)["value"].to_float64();
+  }
+  else
+  {
+    min_val = field_min(*dataset, field)["value"].to_float64();
+  }
 
+  if(min_val >= max_val)
+  {
+    ASCENT_ERROR("Histogram: min value ("
+                 << min_val << ") must be smaller than max (" << max_val
+                 << ")");
+  }
 
   conduit::Node *output = new conduit::Node();
-  (*output)["type"] = "binning";
-  (*output)["attrs/value/value"] = n_binning["value"];
+  (*output)["type"] = "histogram";
+  (*output)["attrs/value/value"] =
+      field_histogram(*dataset, field, min_val, max_val, num_bins)["value"];
   (*output)["attrs/value/type"] = "array";
-  (*output)["attrs/reduction_var/value"] = reduction_var;
-  (*output)["attrs/reduction_var/type"] = "string";
-  (*output)["attrs/reduction_op/value"] = reduction_op;
-  (*output)["attrs/reduction_op/type"] = "string";
-  (*output)["attrs/bin_axes/value"] = n_bin_axes;
-  //(*output)["attrs/bin_axes/type"] = "list";
-  (*output)["attrs/association/value"] = n_binning["association"];
-  (*output)["attrs/association/type"] = "string";
+  (*output)["attrs/min_val/value"] = min_val;
+  (*output)["attrs/min_val/type"] = "double";
+  (*output)["attrs/max_val/value"] = max_val;
+  (*output)["attrs/max_val/type"] = "double";
+  (*output)["attrs/num_bins/value"] = num_bins;
+  (*output)["attrs/num_bins/type"] = "int";
+  (*output)["attrs/clamp/value"] = true;
+  (*output)["attrs/clamp/type"] = "bool";
 
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
-
 }
 
+//*****************************************************************************
+// ExprHistogramEntropy
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-Entropy::Entropy() : Filter()
+ExprHistogramEntropy::ExprHistogramEntropy()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Entropy::~Entropy()
+ExprHistogramEntropy::~ExprHistogramEntropy()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Entropy::declare_interface(Node &i)
+ExprHistogramEntropy::declare_interface(Node &i)
 {
-  i["type_name"] = "entropy";
+  i["type_name"] = "expr_histogram_entropy";
   i["port_names"].append() = "hist";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Entropy::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprHistogramEntropy::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -3254,7 +2956,7 @@ Entropy::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-Entropy::execute()
+ExprHistogramEntropy::execute()
 {
   const conduit::Node *hist = input("hist");
 
@@ -3271,30 +2973,34 @@ Entropy::execute()
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprHistogramPDF
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-Pdf::Pdf() : Filter()
+ExprHistogramPDF::ExprHistogramPDF() : Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Pdf::~Pdf()
+ExprHistogramPDF::~ExprHistogramPDF()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Pdf::declare_interface(Node &i)
+ExprHistogramPDF::declare_interface(Node &i)
 {
-  i["type_name"] = "pdf";
+  i["type_name"] = "expr_histogram_pdf";
   i["port_names"].append() = "hist";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Pdf::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprHistogramPDF::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -3303,7 +3009,7 @@ Pdf::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-Pdf::execute()
+ExprHistogramPDF::execute()
 {
   const conduit::Node *hist = input("hist");
 
@@ -3319,30 +3025,34 @@ Pdf::execute()
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprHistogramCDF
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-Cdf::Cdf() : Filter()
+ExprHistogramCDF::ExprHistogramCDF() : Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Cdf::~Cdf()
+ExprHistogramCDF::~ExprHistogramCDF()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Cdf::declare_interface(Node &i)
+ExprHistogramCDF::declare_interface(Node &i)
 {
-  i["type_name"] = "cdf";
+  i["type_name"] = "expr_histogram_cdf";
   i["port_names"].append() = "hist";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Cdf::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprHistogramCDF::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -3351,48 +3061,265 @@ Cdf::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-Cdf::execute()
+ExprHistogramCDF::execute()
 {
   const conduit::Node *hist = input("hist");
 
   conduit::Node *output = new conduit::Node();
-  (*output)["type"] = "histogram";
-  (*output)["attrs/value/value"] = histogram_cdf(*hist)["value"];
-  (*output)["attrs/value/type"] = "array";
-  (*output)["attrs/min_val"] = (*hist)["attrs/min_val"];
-  (*output)["attrs/max_val"] = (*hist)["attrs/max_val"];
-  (*output)["attrs/num_bins"] = (*hist)["attrs/num_bins"];
+  (*output)["type"] = "histogram";
+  (*output)["attrs/value/value"] = histogram_cdf(*hist)["value"];
+  (*output)["attrs/value/type"] = "array";
+  (*output)["attrs/min_val"] = (*hist)["attrs/min_val"];
+  (*output)["attrs/max_val"] = (*hist)["attrs/max_val"];
+  (*output)["attrs/num_bins"] = (*hist)["attrs/num_bins"];
+
+  resolve_symbol_result(graph(), output, this->name());
+  set_output(output);
+}
+
+//*****************************************************************************
+// ExprHistogramCDFQuantile
+//*****************************************************************************
+
+//-----------------------------------------------------------------------------
+ExprHistogramCDFQuantile::ExprHistogramCDFQuantile()
+: Filter()
+{
+  // empty
+}
+
+//-----------------------------------------------------------------------------
+ExprHistogramCDFQuantile::~ExprHistogramCDFQuantile()
+{
+  // empty
+}
+
+//-----------------------------------------------------------------------------
+void
+ExprHistogramCDFQuantile::declare_interface(Node &i)
+{
+  i["type_name"] = "expr_histogram_cdf_quantile";
+  i["port_names"].append() = "cdf";
+  i["port_names"].append() = "q";
+  i["port_names"].append() = "interpolation";
+  i["output_port"] = "true";
+}
+
+//-----------------------------------------------------------------------------
+bool
+ExprHistogramCDFQuantile::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+{
+  info.reset();
+  bool res = true;
+  return res;
+}
+
+//-----------------------------------------------------------------------------
+void
+ExprHistogramCDFQuantile::execute()
+{
+  const conduit::Node *n_cdf = input("cdf");
+  const conduit::Node *n_val = input("q");
+  // optional inputs
+  const conduit::Node *n_interpolation = input("interpolation");
+
+  const double val = (*n_val)["value"].as_float64();
+
+  if(val < 0 || val > 1)
+  {
+    ASCENT_ERROR("Quantile: val must be between 0 and 1");
+  }
+
+  // handle the optional inputs
+  std::string interpolation = "linear";
+  if(!n_interpolation->dtype().is_empty())
+  {
+    interpolation = (*n_interpolation)["value"].as_string();
+    if(interpolation != "linear" && interpolation != "lower" &&
+       interpolation != "higher" && interpolation != "midpoint" &&
+       interpolation != "nearest")
+    {
+      ASCENT_ERROR("Known interpolation types are: linear, lower, higher, "
+                   "midpoint, nearest");
+    }
+  }
+
+  conduit::Node *output = new conduit::Node();
+  (*output)["value"] = quantile(*n_cdf, val, interpolation)["value"];
+  (*output)["type"] = "double";
+
+  resolve_symbol_result(graph(), output, this->name());
+  set_output(output);
+}
+
+
+//*****************************************************************************
+// ExprHistogramBinByIndex
+//*****************************************************************************
+
+//-----------------------------------------------------------------------------
+ExprHistogramBinByIndex::ExprHistogramBinByIndex()
+: Filter()
+{
+  // empty
+}
+
+//-----------------------------------------------------------------------------
+ExprHistogramBinByIndex::~ExprHistogramBinByIndex()
+{
+  // empty
+}
+
+//-----------------------------------------------------------------------------
+void
+ExprHistogramBinByIndex::declare_interface(Node &i)
+{
+  i["type_name"] = "expr_histogram_bin_by_index";
+  i["port_names"].append() = "hist";
+  i["port_names"].append() = "bin";
+  i["output_port"] = "true";
+}
+
+//-----------------------------------------------------------------------------
+bool
+ExprHistogramBinByIndex::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+{
+  info.reset();
+  bool res = true;
+  return res;
+}
+
+//-----------------------------------------------------------------------------
+void
+ExprHistogramBinByIndex::execute()
+{
+  const conduit::Node *n_bin = input("bin");
+  const conduit::Node *n_hist = input("hist");
+
+  int num_bins = (*n_hist)["attrs/num_bins/value"].as_int32();
+  int bin = (*n_bin)["value"].as_int32();
+
+  if(bin < 0 || bin > num_bins - 1)
+  {
+    ASCENT_ERROR("BinByIndex: bin index must be within the bounds of hist [0, "
+                 << num_bins - 1 << "]");
+  }
+
+  conduit::Node *output = new conduit::Node();
+  const double *bins = (*n_hist)["attrs/value/value"].value();
+  (*output)["value"] = bins[bin];
+  (*output)["type"] = "double";
+
+  resolve_symbol_result(graph(), output, this->name());
+  set_output(output);
+}
+
+//*****************************************************************************
+// ExprHistogramBinByValue
+//*****************************************************************************
+
+//-----------------------------------------------------------------------------
+ExprHistogramBinByValue::ExprHistogramBinByValue()
+: Filter()
+{
+  // empty
+}
+
+//-----------------------------------------------------------------------------
+ExprHistogramBinByValue::~ExprHistogramBinByValue()
+{
+  // empty
+}
+
+//-----------------------------------------------------------------------------
+void
+ExprHistogramBinByValue::declare_interface(Node &i)
+{
+  i["type_name"] = "expr_histogram_bin_by_value";
+  i["port_names"].append() = "hist";
+  i["port_names"].append() = "val";
+  i["output_port"] = "true";
+}
+
+//-----------------------------------------------------------------------------
+bool
+ExprHistogramBinByValue::verify_params(const conduit::Node ¶ms,
+                                       conduit::Node &info)
+{
+  info.reset();
+  bool res = true;
+  return res;
+}
+
+//-----------------------------------------------------------------------------
+void
+ExprHistogramBinByValue::execute()
+{
+  const conduit::Node *n_val = input("val");
+  const conduit::Node *n_hist = input("hist");
+
+  double val = (*n_val)["value"].to_float64();
+  double min_val = (*n_hist)["attrs/min_val/value"].to_float64();
+  double max_val = (*n_hist)["attrs/max_val/value"].to_float64();
+  int num_bins = (*n_hist)["attrs/num_bins/value"].as_int32();
+
+  if(val < min_val || val > max_val)
+  {
+    ASCENT_ERROR("BinByValue: val must within the bounds of hist ["
+                 << min_val << ", " << max_val << "]");
+  }
+
+  const double inv_delta = num_bins / (max_val - min_val);
+  int bin = static_cast((val - min_val) * inv_delta);
+
+  conduit::Node *output = new conduit::Node();
+  const double *bins = (*n_hist)["attrs/value/value"].value();
+  (*output)["value"] = bins[bin];
+  (*output)["type"] = "double";
 
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// Mesh Operations
+// cycle, time, field, topology, bounds, lineout
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+//*****************************************************************************
+// ExprMeshCycle
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-Quantile::Quantile() : Filter()
+ExprMeshCycle::ExprMeshCycle()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Quantile::~Quantile()
+ExprMeshCycle::~ExprMeshCycle()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Quantile::declare_interface(Node &i)
+ExprMeshCycle::declare_interface(Node &i)
 {
-  i["type_name"] = "quantile";
-  i["port_names"].append() = "cdf";
-  i["port_names"].append() = "q";
-  i["port_names"].append() = "interpolation";
+  i["type_name"] = "expr_mesh_cycle";
+  i["port_names"] = DataType::empty();
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Quantile::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprMeshCycle::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -3401,67 +3328,56 @@ Quantile::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-Quantile::execute()
+ExprMeshCycle::execute()
 {
-  const conduit::Node *n_cdf = input("cdf");
-  const conduit::Node *n_val = input("q");
-  // optional inputs
-  const conduit::Node *n_interpolation = input("interpolation");
-
-  const double val = (*n_val)["value"].as_float64();
+  conduit::Node *output = new conduit::Node();
 
-  if(val < 0 || val > 1)
-  {
-    ASCENT_ERROR("Quantile: val must be between 0 and 1");
-  }
+  DataObject *data_object =
+    graph().workspace().registry().fetch("dataset");
+  // we are just getting state so we don't care if its high or low
+  // order
+  const conduit::Node *const dataset = data_object->as_node().get();
 
-  // handle the optional inputs
-  std::string interpolation = "linear";
-  if(!n_interpolation->dtype().is_empty())
+  conduit::Node state = get_state_var(*dataset, "cycle");
+  if(!state.dtype().is_number())
   {
-    interpolation = (*n_interpolation)["value"].as_string();
-    if(interpolation != "linear" && interpolation != "lower" &&
-       interpolation != "higher" && interpolation != "midpoint" &&
-       interpolation != "nearest")
-    {
-      ASCENT_ERROR("Known interpolation types are: linear, lower, higher, "
-                   "midpoint, nearest");
-    }
+    ASCENT_ERROR("Expressions: cycle() is not a number");
   }
 
-  conduit::Node *output = new conduit::Node();
-  (*output)["value"] = quantile(*n_cdf, val, interpolation)["value"];
-  (*output)["type"] = "double";
-
+  (*output)["type"] = "int";
+  (*output)["value"] = state;
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprMeshTime
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-BinByIndex::BinByIndex() : Filter()
+ExprMeshTime::ExprMeshTime() : Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-BinByIndex::~BinByIndex()
+ExprMeshTime::~ExprMeshTime()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-BinByIndex::declare_interface(Node &i)
+ExprMeshTime::declare_interface(Node &i)
 {
-  i["type_name"] = "bin_by_index";
-  i["port_names"].append() = "hist";
-  i["port_names"].append() = "bin";
+  i["type_name"] = "expr_mesh_time";
+  i["port_names"] = DataType::empty();
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-BinByIndex::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprMeshTime::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -3470,54 +3386,58 @@ BinByIndex::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-BinByIndex::execute()
+ExprMeshTime::execute()
 {
-  const conduit::Node *n_bin = input("bin");
-  const conduit::Node *n_hist = input("hist");
+  conduit::Node *output = new conduit::Node();
 
-  int num_bins = (*n_hist)["attrs/num_bins/value"].as_int32();
-  int bin = (*n_bin)["value"].as_int32();
+  DataObject *data_object =
+    graph().workspace().registry().fetch("dataset");
+  // we are just getting state so we don't care if its high or low
+  // order
+  const conduit::Node *const dataset = data_object->as_node().get();
 
-  if(bin < 0 || bin > num_bins - 1)
+  conduit::Node state = get_state_var(*dataset, "time");
+  if(!state.dtype().is_number())
   {
-    ASCENT_ERROR("BinByIndex: bin index must be within the bounds of hist [0, "
-                 << num_bins - 1 << "]");
+    ASCENT_ERROR("Expressions: time() is not a number");
   }
 
-  conduit::Node *output = new conduit::Node();
-  const double *bins = (*n_hist)["attrs/value/value"].value();
-  (*output)["value"] = bins[bin];
   (*output)["type"] = "double";
-
+  (*output)["value"] = state;
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprMeshField
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-BinByValue::BinByValue() : Filter()
+ExprMeshField::ExprMeshField()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-BinByValue::~BinByValue()
+ExprMeshField::~ExprMeshField()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-BinByValue::declare_interface(Node &i)
+ExprMeshField::declare_interface(Node &i)
 {
-  i["type_name"] = "bin_by_value";
-  i["port_names"].append() = "hist";
-  i["port_names"].append() = "val";
+  i["type_name"] = "expr_mesh_field";
+  i["port_names"].append() = "field_name";
+  i["port_names"].append() = "component";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-BinByValue::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprMeshField::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -3526,58 +3446,120 @@ BinByValue::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-BinByValue::execute()
+ExprMeshField::execute()
 {
-  const conduit::Node *n_val = input("val");
-  const conduit::Node *n_hist = input("hist");
+  const conduit::Node *n_field_name = input("field_name");
+  std::string field_name = (*n_field_name)["value"].as_string();
 
-  double val = (*n_val)["value"].to_float64();
-  double min_val = (*n_hist)["attrs/min_val/value"].to_float64();
-  double max_val = (*n_hist)["attrs/max_val/value"].to_float64();
-  int num_bins = (*n_hist)["attrs/num_bins/value"].as_int32();
+  // optional parameters
+  const conduit::Node *n_component = input("component");
 
-  if(val < min_val || val > max_val)
+  if(!graph().workspace().registry().has_entry("dataset"))
   {
-    ASCENT_ERROR("BinByValue: val must within the bounds of hist ["
-                 << min_val << ", " << max_val << "]");
+    ASCENT_ERROR("Field: Missing dataset");
   }
 
-  const double inv_delta = num_bins / (max_val - min_val);
-  int bin = static_cast((val - min_val) * inv_delta);
+  DataObject *data_object =
+    graph().workspace().registry().fetch("dataset");
+  const conduit::Node *const dataset = data_object->as_low_order_bp().get();
+
+  if(!has_field(*dataset, field_name))
+  {
+    std::string known;
+    if(dataset->number_of_children() > 0 )
+    {
+      std::vector names = dataset->child(0)["fields"].child_names();
+      std::stringstream ss;
+      ss << "[";
+      for(size_t i = 0; i < names.size(); ++i)
+      {
+        ss << " '" << names[i]<<"'";
+      }
+      ss << "]";
+      known = ss.str();
+    }
+    ASCENT_ERROR("Field: dataset does not contain field '"
+                 << field_name << "'"
+                 << " known = " << known);
+  }
+
+  std::string component;
+  if(!n_component->dtype().is_empty())
+  {
+    component = (*n_component)["value"].as_string();
+    if(!has_component(*dataset, field_name, component))
+    {
+      ASCENT_ERROR("Field variable '"
+                   << field_name << "'"
+                   << " does not have component '" << component << "'."
+                   << " known components = "
+                   << possible_components(*dataset, field_name));
+    }
+  }
+
+  // at this point, we know that the field exists.
+  // If the the field has only one component then we
+  // don't require that the name be provide, but the
+  // code will need the name.
+
+
+  // if the field only has one component use that
+  if(component.empty())
+  {
+
+    int num_comps = num_components(*dataset, field_name);
+    if(num_comps == 1)
+    {
+      const int comp_idx = 0;
+      component = component_name(*dataset, field_name, comp_idx);
+    }
+    else if(num_comps == 0)
+    {
+      // default name for empty path
+      component = "";
+    }
+  }
 
   conduit::Node *output = new conduit::Node();
-  const double *bins = (*n_hist)["attrs/value/value"].value();
-  (*output)["value"] = bins[bin];
-  (*output)["type"] = "double";
+  (*output)["value"] = field_name;
+  if(!component.empty())
+  {
+    (*output)["component"] = component;
+  }
+  (*output)["type"] = "field";
 
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprMeshTopology
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-FieldSum::FieldSum() : Filter()
+ExprMeshTopology::ExprMeshTopology() : Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-FieldSum::~FieldSum()
+ExprMeshTopology::~ExprMeshTopology()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-FieldSum::declare_interface(Node &i)
+ExprMeshTopology::declare_interface(Node &i)
 {
-  i["type_name"] = "field_sum";
+  i["type_name"] = "expr_mesh_topology";
   i["port_names"].append() = "arg1";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-FieldSum::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprMeshTopology::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -3586,46 +3568,71 @@ FieldSum::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-FieldSum::execute()
+ExprMeshTopology::execute()
 {
-  std::string field = (*input("arg1"))["value"].as_string();
+  const conduit::Node *arg1 = input("arg1");
+
+  const std::string topo = (*arg1)["value"].as_string();
+
+  if(!graph().workspace().registry().has_entry("dataset"))
+  {
+    ASCENT_ERROR("Topology: Missing dataset");
+  }
 
   DataObject *data_object =
     graph().workspace().registry().fetch("dataset");
   const conduit::Node *const dataset = data_object->as_low_order_bp().get();
 
+  if(!has_topology(*dataset, topo))
+  {
+    std::set names = topology_names(*dataset);
+    std::stringstream msg;
+    msg<<"Unknown topology: '"<name());
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprMeshBounds
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-FieldNanCount::FieldNanCount() : Filter()
+ExprMeshBounds::ExprMeshBounds()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-FieldNanCount::~FieldNanCount()
+ExprMeshBounds::~ExprMeshBounds()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-FieldNanCount::declare_interface(Node &i)
+ExprMeshBounds::declare_interface(Node &i)
 {
-  i["type_name"] = "field_nan_count";
-  i["port_names"].append() = "arg1";
+  i["type_name"] = "expr_mesh_bounds";
+  i["port_names"].append() = "topology";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-FieldNanCount::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprMeshBounds::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -3634,46 +3641,96 @@ FieldNanCount::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-FieldNanCount::execute()
+ExprMeshBounds::execute()
 {
-  std::string field = (*input("arg1"))["value"].as_string();
+  conduit::Node &n_topology = *input("topology");
+  conduit::Node *output = new conduit::Node();
 
   DataObject *data_object =
     graph().workspace().registry().fetch("dataset");
-  conduit::Node *dataset = data_object->as_low_order_bp().get();
+  const conduit::Node *const dataset = data_object->as_low_order_bp().get();
 
-  conduit::Node *output = new conduit::Node();
-  (*output)["value"] = field_nan_count(*dataset, field)["value"];
-  (*output)["type"] = "double";
+  std::set topos;
+
+  if(!n_topology.dtype().is_empty())
+  {
+    std::string topo = n_topology["value"].as_string();
+    if(!has_topology(*dataset, topo))
+    {
+      std::set names = topology_names(*dataset);
+      std::stringstream msg;
+      msg<<"Unknown topology: '"<::infinity();
+  double min_vec[3] = {inf, inf, inf};
+  double max_vec[3] = {-inf, -inf, -inf};
+  for(auto &topo_name : topos)
+  {
+    conduit::Node n_aabb = global_bounds(*dataset, topo_name);
+    double *t_min = n_aabb["min_coords"].as_float64_ptr();
+    double *t_max = n_aabb["max_coords"].as_float64_ptr();
+    for(int i = 0; i < 3; ++i)
+    {
+      min_vec[i] = std::min(t_min[i],min_vec[i]);
+      max_vec[i] = std::max(t_max[i],max_vec[i]);
+    }
+  }
+
+  (*output)["type"] = "aabb";
+  (*output)["attrs/min/value"].set(min_vec, 3);
+  (*output)["attrs/min/type"] = "vector";
+  (*output)["attrs/max/value"].set(max_vec, 3);
+  (*output)["attrs/max/type"] = "vector";
 
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprMeshLineout
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-FieldInfCount::FieldInfCount() : Filter()
+ExprMeshLineout::ExprMeshLineout() : Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-FieldInfCount::~FieldInfCount()
+ExprMeshLineout::~ExprMeshLineout()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-FieldInfCount::declare_interface(Node &i)
+ExprMeshLineout::declare_interface(Node &i)
 {
-  i["type_name"] = "field_inf_count";
-  i["port_names"].append() = "arg1";
+  i["type_name"] = "expr_mesh_lineout";
+  i["port_names"].append() = "samples";
+  i["port_names"].append() = "start";
+  i["port_names"].append() = "end";
+  i["port_names"].append() = "fields";
+  i["port_names"].append() = "empty_val";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-FieldInfCount::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprMeshLineout::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -3682,46 +3739,168 @@ FieldInfCount::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-FieldInfCount::execute()
+ExprMeshLineout::execute()
 {
-  std::string field = (*input("arg1"))["value"].as_string();
+
+#if defined(ASCENT_DRAY_ENABLED)
+  conduit::Node &n_samples = *input("samples");
+  int32 samples = n_samples["value"].to_int32();;
+  if(samples < 1)
+  {
+    ASCENT_ERROR("Lineout: samples must be greater than zero: '"<("start");
+  double *p_start = n_start["value"].as_float64_ptr();
+
+  dray::Vec start;
+  start[0] = static_cast(p_start[0]);
+  start[1] = static_cast(p_start[1]);
+  start[2] = static_cast(p_start[2]);
+
+  conduit::Node &n_end= *input("end");
+  double *p_end = n_end["value"].as_float64_ptr();
+
+  dray::Vec end;
+  end[0] = static_cast(p_end[0]);
+  end[1] = static_cast(p_end[1]);
+  end[2] = static_cast(p_end[2]);
+
+  conduit::Node *output = new conduit::Node();
 
   DataObject *data_object =
     graph().workspace().registry().fetch("dataset");
-  conduit::Node *dataset = data_object->as_low_order_bp().get();
+  dray::Collection * collection = data_object->as_dray_collection().get();
 
-  conduit::Node *output = new conduit::Node();
-  (*output)["value"] = field_inf_count(*dataset, field)["value"];
-  (*output)["type"] = "double";
+  dray::Lineout lineout;
+
+  lineout.samples(samples);
+
+  conduit::Node &n_empty_val = *input("empty_val");
+  if(!n_empty_val.dtype().is_empty())
+  {
+    double empty_val = n_empty_val["value"].to_float64();
+    lineout.empty_val(empty_val);
+  }
+
+  // figure out the number of fields we will use
+  conduit::Node &n_fields = (*input("fields"))["value"];
+  const int num_fields = n_fields.number_of_children();
+  if(num_fields > 0)
+  {
+    for(int i = 0; i < num_fields; ++i)
+    {
+      const conduit::Node &n_field = n_fields.child(i);
+      if(n_field["type"].as_string() != "string")
+      {
+        ASCENT_ERROR("Lineout: field list item is not a string");
+      }
+
+      lineout.add_var(n_field["value"].as_string());
+    }
+  }
+  else
+  {
+    std::set field_names;
+    // use all fields
+    for(int i = 0; i < collection->size(); ++i)
+    {
+      dray::DataSet dset = collection->domain(i);
+      std::vector d_names = dset.fields();
+      for(int n = 0; n < d_names.size(); ++n)
+      {
+        field_names.insert(d_names[n]);
+      }
+    }
+    gather_strings(field_names);
+  }
+
+  lineout.add_line(start, end);
+
+  dray::Lineout::Result res = lineout.execute(*collection);
+  (*output)["type"] = "lineout";
+  (*output)["attrs/empty_value/value"] = double(res.m_empty_val);
+  (*output)["attrs/empty_value/type"] = "double";
+  (*output)["attrs/samples/value"] = int(res.m_points_per_line);
+  (*output)["attrs/samples/type"] = "int";
+  // we only have one line so the size of points is the size of everything
+  const int size = res.m_points.size();
+  (*output)["attrs/coordinates/x/value"] = conduit::DataType::float64(size);
+  (*output)["attrs/coordinates/x/type"] = "array";
+  (*output)["attrs/coordinates/y/value"] = conduit::DataType::float64(size);
+  (*output)["attrs/coordinates/y/type"] = "array";
+  (*output)["attrs/coordinates/z/value"] = conduit::DataType::float64(size);
+  (*output)["attrs/coordinates/z/type"] = "array";
+  float64_array x = (*output)["attrs/coordinates/x/value"].value();
+  float64_array y = (*output)["attrs/coordinates/y/value"].value();
+  float64_array z = (*output)["attrs/coordinates/z/value"].value();
+  for(int i = 0; i < size; ++i)
+  {
+    dray::Vec p = res.m_points.get_value(i);
+    x[i] = static_cast(p[0]);
+    y[i] = static_cast(p[1]);
+    z[i] = static_cast(p[2]);
+  }
+
+  const int var_size = res.m_vars.size();
+  for(int v = 0; v < var_size; ++v)
+  {
+    std::string var = res.m_vars[v];
+    (*output)["attrs/vars/"+var+"/value"] = conduit::DataType::float64(size);
+    (*output)["attrs/vars/"+var+"/type"] = "array";
+    float64_array var_array = (*output)["attrs/vars/"+var+"/value"].value();
+    for(int i = 0; i < size; ++i)
+    {
+      var_array[i] = static_cast(res.m_values[v].get_value(i));
+    }
+  }
 
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
+  
+#else
+  ASCENT_ERROR("Lineout only supported when Devil Ray is built");
+#endif
 }
 
 //-----------------------------------------------------------------------------
-ArraySum::ArraySum() : Filter()
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// Mesh Field Operations
+//  min reduce, max reduce, avg reduce, sum reduce, nan count, inf count
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+//*****************************************************************************
+// ExprMeshFieldReductionMin
+//*****************************************************************************
+
+//-----------------------------------------------------------------------------
+ExprMeshFieldReductionMin::ExprMeshFieldReductionMin()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-ArraySum::~ArraySum()
+ExprMeshFieldReductionMin::~ExprMeshFieldReductionMin()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-ArraySum::declare_interface(Node &i)
+ExprMeshFieldReductionMin::declare_interface(Node &i)
 {
-  i["type_name"] = "array_sum";
+  i["type_name"] = "expr_mesh_field_reduction_min";
   i["port_names"].append() = "arg1";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-ArraySum::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprMeshFieldReductionMin::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -3730,45 +3909,71 @@ ArraySum::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-ArraySum::execute()
+ExprMeshFieldReductionMin::execute()
 {
+  const conduit::Node *arg1 = input("arg1");
+
+  const std::string field = (*arg1)["value"].as_string();
+
   conduit::Node *output = new conduit::Node();
-  std::string exec = ExecutionManager::preferred_cpu_policy();
-  (*output)["value"] = array_sum((*input("arg1"))["value"], exec)["value"];
-  (*output)["type"] = "double";
+
+  DataObject *data_object =
+    graph().workspace().registry().fetch("dataset");
+  const conduit::Node *const dataset = data_object->as_low_order_bp().get();
+
+  if(!is_scalar_field(*dataset, field))
+  {
+    ASCENT_ERROR("ExprFieldReductionMin: field '"
+                 << field << "' is not a scalar field");
+  }
+
+  // TODO
+  conduit::Node n_min = field_min(*dataset, field);
+
+  (*output)["type"] = "value_position";
+  (*output)["attrs/value/value"] = n_min["value"];
+  (*output)["attrs/value/type"] = "double";
+  (*output)["attrs/position/value"] = n_min["position"];
+  (*output)["attrs/position/type"] = "vector";
+  // information about the element/field
+  (*output)["attrs/element/rank"] = n_min["rank"];
+  (*output)["attrs/element/domain_index"] = n_min["domain_id"];
+  (*output)["attrs/element/index"] = n_min["index"];
+  (*output)["attrs/element/assoc"] = n_min["assoc"];
 
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
+
+//*****************************************************************************
+// ExprMeshFieldReductionMax
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-PointAndAxis::PointAndAxis() : Filter()
+ExprMeshFieldReductionMax::ExprMeshFieldReductionMax()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-PointAndAxis::~PointAndAxis()
+ExprMeshFieldReductionMax::~ExprMeshFieldReductionMax()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-PointAndAxis::declare_interface(Node &i)
+ExprMeshFieldReductionMax::declare_interface(Node &i)
 {
-  i["type_name"] = "point_and_axis";
-  i["port_names"].append() = "binning";
-  i["port_names"].append() = "axis";
-  i["port_names"].append() = "threshold";
-  i["port_names"].append() = "point";
-  i["port_names"].append() = "miss_value";
-  i["port_names"].append() = "direction";
+  i["type_name"] = "expr_mesh_field_reduction_max";
+  i["port_names"].append() = "arg1";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-PointAndAxis::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprMeshFieldReductionMax::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -3777,129 +3982,69 @@ PointAndAxis::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-PointAndAxis::execute()
+ExprMeshFieldReductionMax::execute()
 {
-  conduit::Node &in_binning = *input("binning");
-  conduit::Node &in_axis =  *input("axis");
-  conduit::Node &in_threshold =  *input("threshold");
-  conduit::Node &in_point =  *input("point");
-  conduit::Node &n_miss_val =  *input("miss_value");
-  conduit::Node &n_dir =  *input("direction");
-  conduit::Node *output = new conduit::Node();
-
-  const int num_axes = in_binning["attrs/bin_axes"].number_of_children();
-  if(num_axes > 1)
-  {
-    ASCENT_ERROR("point_and_axis: only one axis is implemented");
-  }
-
-  int direction = 1;
-  if(!n_dir.dtype().is_empty())
-  {
-    direction = n_dir["value"].to_int32();
-    if(direction != 1 && direction != -1)
-    {
-      ASCENT_ERROR("point_and_axis: invalid direction `"<::max();
-  int index = -1;
-  for(int i = 0; i < num_bins; ++i)
-  {
-    double val = bins[i];
-    if(val > threshold)
-    {
-      double left = min_val + double(i) * bin_size;
-      double right = min_val + double(i+1) * bin_size;
-      double center = left + (right-left) / 2.0;
-      double dist = center - point;
-      // skip if distance is behind
-      bool behind = dist * double(direction) < 0;
-
-      if(!behind && dist < min_dist)
-      {
-        min_dist = dist;
-        index = i;
-      }
-    }
-  }
-
-  double bin_value = std::numeric_limits::quiet_NaN();
-
-  if(!n_miss_val.dtype().is_empty())
-  {
-    bin_value = n_miss_val["value"].to_float64();
-  }
 
-  // init with miss
-  double bin_min = bin_value;
-  double bin_max = bin_value;
-  double bin_center = bin_value;
+  const conduit::Node *arg1 = input("arg1");
 
-  if(index != -1)
-  {
-    bin_value = bins[index];
-    bin_min = min_val + double(index) * bin_size;
-    bin_max = min_val + double(index+1) * bin_size;
-    bin_center = bin_min + (bin_max-bin_min) / 2.0;
-  }
+  const std::string field = (*arg1)["value"].as_string();
 
-  (*output)["type"] = "bin";
+  conduit::Node *output = new conduit::Node();
 
-  (*output)["attrs/value/value"] = bin_value;
-  (*output)["attrs/value/type"] = "double";
+  DataObject *data_object =
+    graph().workspace().registry().fetch("dataset");
+  const conduit::Node *const dataset = data_object->as_low_order_bp().get();
 
-  (*output)["attrs/min/value"] = bin_min;
-  (*output)["attrs/min/type"] = "double";
+  if(!is_scalar_field(*dataset, field))
+  {
+    ASCENT_ERROR("FieldMax: field '" << field << "' is not a scalar field");
+  }
 
-  (*output)["attrs/max/value"] = bin_max;
-  (*output)["attrs/max/type"] = "double";
+  conduit::Node n_max = field_max(*dataset, field);
 
-  (*output)["attrs/center/value"] = bin_center;
-  (*output)["attrs/center/type"] = "double";
+  (*output)["type"] = "value_position";
+  (*output)["attrs/value/value"] = n_max["value"];
+  (*output)["attrs/value/type"] = "double";
+  (*output)["attrs/position/value"] = n_max["position"];
+  (*output)["attrs/position/type"] = "vector";
+  // information about the element/field
+  (*output)["attrs/element/rank"] = n_max["rank"];
+  (*output)["attrs/element/domain_index"] = n_max["domain_id"];
+  (*output)["attrs/element/index"] = n_max["index"];
+  (*output)["attrs/element/assoc"] = n_max["assoc"];
 
-  resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprMeshFieldReductionAvg
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-MaxFromPoint::MaxFromPoint() : Filter()
+ExprMeshFieldReductionAvg::ExprMeshFieldReductionAvg()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-MaxFromPoint::~MaxFromPoint()
+ExprMeshFieldReductionAvg::~ExprMeshFieldReductionAvg()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-MaxFromPoint::declare_interface(Node &i)
+ExprMeshFieldReductionAvg::declare_interface(Node &i)
 {
-  i["type_name"] = "max_from_point";
-  i["port_names"].append() = "binning";
-  i["port_names"].append() = "axis";
-  i["port_names"].append() = "point";
+  i["type_name"] = "expr_mesh_field_reduction_avg";
+  i["port_names"].append() = "arg1";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-MaxFromPoint::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprMeshFieldReductionAvg::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -3908,106 +4053,60 @@ MaxFromPoint::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-MaxFromPoint::execute()
+ExprMeshFieldReductionAvg::execute()
 {
-  conduit::Node &in_binning = *input("binning");
-  conduit::Node &in_axis =  *input("axis");
-  conduit::Node &in_point =  *input("point");
-  conduit::Node *output = new conduit::Node();
-
-  const int num_axes = in_binning["attrs/bin_axes"].number_of_children();
-  if(num_axes > 1)
-  {
-    ASCENT_ERROR("max_from_point: only one axis is implemented");
-  }
-
-  const double point = in_point["value"].to_float64();
+  const conduit::Node *arg1 = input("arg1");
 
-  const conduit::Node &axis = in_binning["attrs/bin_axes/value"].child(0);
-  const int num_bins = axis["num_bins"].to_int32();
-  const double min_val = axis["min_val"].to_float64();
-  const double max_val = axis["max_val"].to_float64();
-  const double bin_size = (max_val - min_val) / double(num_bins);
+  const std::string field = (*arg1)["value"].as_string();
 
-  double *bins = in_binning["attrs/value/value"].value();
-  double max_bin_val = std::numeric_limits::lowest();
-  double dist_value = 0;
-  double min_dist = std::numeric_limits::max();
-  int index = -1;
-  for(int i = 0; i < num_bins; ++i)
-  {
-    double val = bins[i];
-    if(val >= max_bin_val)
-    {
-      double left = min_val + double(i) * bin_size;
-      double right = min_val + double(i+1) * bin_size;
-      double center = left + (right-left) / 2.0;
-      double dist = fabs(center - point);
-      if(val > max_bin_val ||
-         ((dist < min_dist) && val == max_bin_val))
-      {
-        min_dist = dist;
-        max_bin_val = val;
-        dist_value = center - point;
-        index = i;
-      }
-    }
-  }
+  conduit::Node *output = new conduit::Node();
 
-  double loc[3] = {0.0, 0.0, 0.0};
-  std::string axis_str = in_axis["value"].as_string();
+  DataObject *data_object =
+    graph().workspace().registry().fetch("dataset");
+  const conduit::Node *const dataset = data_object->as_low_order_bp().get();
 
-  if(axis_str == "z")
-  {
-    loc[2] = dist_value;
-  }
-  else if (axis_str == "y")
-  {
-    loc[1] = dist_value;
-  }
-  else
+  if(!is_scalar_field(*dataset, field))
   {
-    loc[0] = dist_value;
+    ASCENT_ERROR("FieldAvg: field '" << field << "' is not a scalar field");
   }
 
-  (*output)["type"] = "value_position";
-  (*output)["attrs/value/value"] = max_bin_val;
-  (*output)["attrs/value/type"] = "double";
-  (*output)["attrs/position/value"].set(loc,3);
-  (*output)["attrs/position/type"] = "vector";
+  conduit::Node n_avg = field_avg(*dataset, field);
 
-  (*output)["value"] = min_dist;
+  (*output)["value"] = n_avg["value"];
   (*output)["type"] = "double";
 
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprMeshFieldReductionSum
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-Bin::Bin() : Filter()
+ExprMeshFieldReductionSum::ExprMeshFieldReductionSum() : Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Bin::~Bin()
+ExprMeshFieldReductionSum::~ExprMeshFieldReductionSum()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Bin::declare_interface(Node &i)
+ExprMeshFieldReductionSum::declare_interface(Node &i)
 {
-  i["type_name"] = "bin";
-  i["port_names"].append() = "binning";
-  i["port_names"].append() = "index";
+  i["type_name"] = "expr_mesh_field_reduction_sum";
+  i["port_names"].append() = "arg1";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Bin::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprMeshFieldReductionSum::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -4016,85 +4115,103 @@ Bin::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-Bin::execute()
+ExprMeshFieldReductionSum::execute()
 {
-  conduit::Node &in_binning = *input("binning");
-  conduit::Node &in_index =  *input("index");
-  conduit::Node *output = new conduit::Node();
+  std::string field = (*input("arg1"))["value"].as_string();
 
-  const int num_axes = in_binning["attrs/bin_axes"].number_of_children();
-  if(num_axes > 1)
-  {
-    ASCENT_ERROR("bin: only one axis is implemented");
-  }
+  DataObject *data_object =
+    graph().workspace().registry().fetch("dataset");
+  const conduit::Node *const dataset = data_object->as_low_order_bp().get();
 
-  int bindex = in_index["value"].to_int32();
+  conduit::Node *output = new conduit::Node();
+  (*output)["value"] = field_sum(*dataset, field)["value"];
+  (*output)["type"] = "double";
 
-  const conduit::Node &axis = in_binning["attrs/bin_axes/value"].child(0);
-  const int num_bins = axis["num_bins"].to_int32();
+  resolve_symbol_result(graph(), output, this->name());
+  set_output(output);
+}
 
-  if(bindex < 0 || bindex >= num_bins)
-  {
-    ASCENT_ERROR("bin: invalid bin "<("arg1"))["value"].as_string();
 
-  (*output)["attrs/max/value"] = right;
-  (*output)["attrs/max/type"] = "double";
+  DataObject *data_object =
+    graph().workspace().registry().fetch("dataset");
+  conduit::Node *dataset = data_object->as_low_order_bp().get();
 
-  (*output)["attrs/center/value"] = center;
-  (*output)["attrs/center/type"] = "double";
+  conduit::Node *output = new conduit::Node();
+  (*output)["value"] = field_nan_count(*dataset, field)["value"];
+  (*output)["type"] = "double";
 
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprMeshFieldReductionInfCount
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-Lineout::Lineout() : Filter()
+ExprMeshFieldReductionInfCount::ExprMeshFieldReductionInfCount()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Lineout::~Lineout()
+ExprMeshFieldReductionInfCount::~ExprMeshFieldReductionInfCount()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Lineout::declare_interface(Node &i)
+ExprMeshFieldReductionInfCount::declare_interface(Node &i)
 {
-  i["type_name"] = "lineout";
-  i["port_names"].append() = "samples";
-  i["port_names"].append() = "start";
-  i["port_names"].append() = "end";
-  i["port_names"].append() = "fields";
-  i["port_names"].append() = "empty_val";
+  i["type_name"] = "expr_mesh_field_reduction_inf_count";
+  i["port_names"].append() = "arg1";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Lineout::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprMeshFieldReductionInfCount::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -4103,156 +4220,154 @@ Lineout::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-Lineout::execute()
+ExprMeshFieldReductionInfCount::execute()
 {
+  std::string field = (*input("arg1"))["value"].as_string();
 
-#if defined(ASCENT_DRAY_ENABLED)
-  conduit::Node &n_samples = *input("samples");
-  int32 samples = n_samples["value"].to_int32();;
-  if(samples < 1)
-  {
-    ASCENT_ERROR("Lineout: samples must be greater than zero: '"<("start");
-  double *p_start = n_start["value"].as_float64_ptr();
-
-  dray::Vec start;
-  start[0] = static_cast(p_start[0]);
-  start[1] = static_cast(p_start[1]);
-  start[2] = static_cast(p_start[2]);
+  DataObject *data_object =
+    graph().workspace().registry().fetch("dataset");
+  conduit::Node *dataset = data_object->as_low_order_bp().get();
 
-  conduit::Node &n_end= *input("end");
-  double *p_end = n_end["value"].as_float64_ptr();
+  conduit::Node *output = new conduit::Node();
+  (*output)["value"] = field_inf_count(*dataset, field)["value"];
+  (*output)["type"] = "double";
 
-  dray::Vec end;
-  end[0] = static_cast(p_end[0]);
-  end[1] = static_cast(p_end[1]);
-  end[2] = static_cast(p_end[2]);
+  resolve_symbol_result(graph(), output, this->name());
+  set_output(output);
+}
 
-  conduit::Node *output = new conduit::Node();
 
-  DataObject *data_object =
-    graph().workspace().registry().fetch("dataset");
-  dray::Collection * collection = data_object->as_dray_collection().get();
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// Binning Operations
+//  binning, binning_axis, bin_by_index, point_and_axis, max_from_point
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
 
-  dray::Lineout lineout;
+//*****************************************************************************
+// ExprMeshBinning
+//*****************************************************************************
 
-  lineout.samples(samples);
+//-----------------------------------------------------------------------------
+ExprMeshBinning::ExprMeshBinning()
+: Filter()
+{
+  // empty
+}
 
-  conduit::Node &n_empty_val = *input("empty_val");
-  if(!n_empty_val.dtype().is_empty())
-  {
-    double empty_val = n_empty_val["value"].to_float64();
-    lineout.empty_val(empty_val);
-  }
+//-----------------------------------------------------------------------------
+ExprMeshBinning::~ExprMeshBinning()
+{
+  // empty
+}
 
-  // figure out the number of fields we will use
-  conduit::Node &n_fields = (*input("fields"))["value"];
-  const int num_fields = n_fields.number_of_children();
-  if(num_fields > 0)
-  {
-    for(int i = 0; i < num_fields; ++i)
-    {
-      const conduit::Node &n_field = n_fields.child(i);
-      if(n_field["type"].as_string() != "string")
-      {
-        ASCENT_ERROR("Lineout: field list item is not a string");
-      }
+//-----------------------------------------------------------------------------
+void
+ExprMeshBinning::declare_interface(Node &i)
+{
+  i["type_name"] = "expr_mesh_binning";
+  i["port_names"].append() = "reduction_var";
+  i["port_names"].append() = "reduction_op";
+  i["port_names"].append() = "bin_axes";
+  i["port_names"].append() = "empty_bin_val";
+  i["port_names"].append() = "component";
+  i["output_port"] = "true";
+}
 
-      lineout.add_var(n_field["value"].as_string());
-    }
-  }
-  else
-  {
-    std::set field_names;
-    // use all fields
-    for(int i = 0; i < collection->size(); ++i)
-    {
-      dray::DataSet dset = collection->domain(i);
-      std::vector d_names = dset.fields();
-      for(int n = 0; n < d_names.size(); ++n)
-      {
-        field_names.insert(d_names[n]);
-      }
-    }
-    gather_strings(field_names);
-  }
+//-----------------------------------------------------------------------------
+bool
+ExprMeshBinning::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+{
+  info.reset();
+  bool res = true;
+  return res;
+}
 
+//-----------------------------------------------------------------------------
+void
+ExprMeshBinning::execute()
+{
+  DataObject *data_object =
+    graph().workspace().registry().fetch("dataset");
 
+  conduit::Node *dataset = data_object->as_low_order_bp().get();
 
-  lineout.add_line(start, end);
+  const std::string reduction_var =
+      (*input("reduction_var"))["value"].as_string();
+  const std::string reduction_op =
+      (*input("reduction_op"))["value"].as_string();
+  const conduit::Node *n_axes_list = input("bin_axes");
+  // optional arguments
+  const conduit::Node *n_empty_bin_val = input("empty_bin_val");
+  const conduit::Node *n_component = input("component");
 
-  dray::Lineout::Result res = lineout.execute(*collection);
-  (*output)["type"] = "lineout";
-  (*output)["attrs/empty_value/value"] = double(res.m_empty_val);
-  (*output)["attrs/empty_value/type"] = "double";
-  (*output)["attrs/samples/value"] = int(res.m_points_per_line);
-  (*output)["attrs/samples/type"] = "int";
-  // we only have one line so the size of points is the size of everything
-  const int size = res.m_points.size();
-  (*output)["attrs/coordinates/x/value"] = conduit::DataType::float64(size);
-  (*output)["attrs/coordinates/x/type"] = "array";
-  (*output)["attrs/coordinates/y/value"] = conduit::DataType::float64(size);
-  (*output)["attrs/coordinates/y/type"] = "array";
-  (*output)["attrs/coordinates/z/value"] = conduit::DataType::float64(size);
-  (*output)["attrs/coordinates/z/type"] = "array";
-  float64_array x = (*output)["attrs/coordinates/x/value"].value();
-  float64_array y = (*output)["attrs/coordinates/y/value"].value();
-  float64_array z = (*output)["attrs/coordinates/z/value"].value();
-  for(int i = 0; i < size; ++i)
-  {
-    dray::Vec p = res.m_points.get_value(i);
-    x[i] = static_cast(p[0]);
-    y[i] = static_cast(p[1]);
-    z[i] = static_cast(p[2]);
-  }
+  conduit::Node n_binning;
+  conduit::Node n_bin_axes;
 
-  const int var_size = res.m_vars.size();
-  for(int v = 0; v < var_size; ++v)
-  {
-    std::string var = res.m_vars[v];
-    (*output)["attrs/vars/"+var+"/value"] = conduit::DataType::float64(size);
-    (*output)["attrs/vars/"+var+"/type"] = "array";
-    float64_array var_array = (*output)["attrs/vars/"+var+"/value"].value();
-    for(int i = 0; i < size; ++i)
-    {
-      var_array[i] = static_cast(res.m_values[v].get_value(i));
-    }
-  }
+  binning_interface(reduction_var,
+                    reduction_op,
+                    *n_empty_bin_val,
+                    *n_component,
+                    *n_axes_list,
+                    *dataset,
+                    n_binning,
+                    n_bin_axes);
+
+  conduit::Node *output = new conduit::Node();
+  (*output)["type"] = "binning";
+  (*output)["attrs/value/value"] = n_binning["value"];
+  (*output)["attrs/value/type"] = "array";
+  (*output)["attrs/reduction_var/value"] = reduction_var;
+  (*output)["attrs/reduction_var/type"] = "string";
+  (*output)["attrs/reduction_op/value"] = reduction_op;
+  (*output)["attrs/reduction_op/type"] = "string";
+  (*output)["attrs/bin_axes/value"] = n_bin_axes;
+  //(*output)["attrs/bin_axes/type"] = "list";
+  (*output)["attrs/association/value"] = n_binning["association"];
+  (*output)["attrs/association/type"] = "string";
 
   resolve_symbol_result(graph(), output, this->name());
   set_output(output);
-  
-#else
-  ASCENT_ERROR("Lineout only supported when Devil Ray is built");
-#endif
+
 }
 
+//*****************************************************************************
+// ExprMeshBinningAxis
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-Bounds::Bounds() : Filter()
+ExprMeshBinningAxis::ExprMeshBinningAxis()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Bounds::~Bounds()
+ExprMeshBinningAxis::~ExprMeshBinningAxis()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Bounds::declare_interface(Node &i)
+ExprMeshBinningAxis::declare_interface(Node &i)
 {
-  i["type_name"] = "bounds";
-  i["port_names"].append() = "topology";
+  i["type_name"] = "expr_mesh_binning_axis";
+  i["port_names"].append() = "name";
+  i["port_names"].append() = "min_val";
+  i["port_names"].append() = "max_val";
+  i["port_names"].append() = "num_bins";
+  i["port_names"].append() = "bins";
+  i["port_names"].append() = "clamp";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Bounds::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprMeshBinningAxis::verify_params(const conduit::Node ¶ms,
+                                   conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -4261,88 +4376,178 @@ Bounds::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-Bounds::execute()
+ExprMeshBinningAxis::execute()
 {
-  conduit::Node &n_topology = *input("topology");
-  conduit::Node *output = new conduit::Node();
+  const std::string name = (*input("name"))["value"].as_string();
+  // uniform binning
+  const conduit::Node *n_min = input("min_val");
+  const conduit::Node *n_max = input("max_val");
+  const conduit::Node *n_num_bins = input("num_bins");
+  // rectilinear binning
+  const conduit::Node *n_bins_list_obj = input("bins");
+  // clamp
+  const conduit::Node *n_clamp = input("clamp");
+
+  if(!graph().workspace().registry().has_entry("dataset"))
+  {
+    ASCENT_ERROR("Axis: Missing dataset");
+  }
 
   DataObject *data_object =
     graph().workspace().registry().fetch("dataset");
   const conduit::Node *const dataset = data_object->as_low_order_bp().get();
 
-  std::set topos;
+  if(!is_scalar_field(*dataset, name) && !is_xyz(name))
+  {
+    std::string known;
+    if(dataset->number_of_children() > 0 )
+    {
+      std::vector names = dataset->child(0)["fields"].child_names();
+      std::stringstream ss;
+      ss << "[";
+      for(size_t i = 0; i < names.size(); ++i)
+      {
+        ss << " '" << names[i]<<"'";
+      }
+      ss << "]";
+      known = ss.str();
+    }
 
-  if(!n_topology.dtype().is_empty())
+    ASCENT_ERROR("Binning Axis: Axes must be scalar fields or x/y/z. Dataset does not "
+                 "contain scalar field '"
+                 << name << "'. Possible field names "<dtype().is_empty())
   {
-    std::string topo = n_topology["value"].as_string();
-    if(!has_topology(*dataset, topo))
+    const conduit::Node &n_bins_list = (*n_bins_list_obj)["value"];
+    // ensure none of the uniform binning arguments are passed
+    if(!n_min->dtype().is_empty() || !n_max->dtype().is_empty() ||
+       !n_num_bins->dtype().is_empty())
     {
-      std::set names = topology_names(*dataset);
-      std::stringstream msg;
-      msg<<"Unknown topology: '"<= bins[i])
+      {
+        delete output;
+        ASCENT_ERROR("Binning Axis: bin extents must be strictly increasing scalars.");
       }
-      msg<<" ]";
-      ASCENT_ERROR(msg.str());
     }
-    topos.insert(topo);
   }
   else
   {
-    topos = topology_names(*dataset);
-  }
+    output = new conduit::Node();
 
-  double inf = std::numeric_limits::infinity();
-  double min_vec[3] = {inf, inf, inf};
-  double max_vec[3] = {-inf, -inf, -inf};
-  for(auto &topo_name : topos)
-  {
-    conduit::Node n_aabb = global_bounds(*dataset, topo_name);
-    double *t_min = n_aabb["min_coords"].as_float64_ptr();
-    double *t_max = n_aabb["max_coords"].as_float64_ptr();
-    for(int i = 0; i < 3; ++i)
+    // Normally, we would do all the error checking here/ determined
+    // the mins and maxs, but there are some issues. Since we are
+    // merely an axis , which is part of data binning, we are not
+    // aware of the field that the binning is on. Thus, we can't
+    // automatically figure out the spatial min/max since
+    // we don't know the topoloy. Thus we will defer the error
+    // checking to the actual binning code.
+    double min_val;
+    bool min_found = false;
+    if(!n_min->dtype().is_empty())
     {
-      min_vec[i] = std::min(t_min[i],min_vec[i]);
-      max_vec[i] = std::max(t_max[i],max_vec[i]);
+      min_val = (*n_min)["value"].to_float64();
+      (*output)["value/" + name + "/min_val"] = min_val;
+      min_found = true;
+    }
+
+    double max_val;
+    bool max_found = false;
+    if(!n_max->dtype().is_empty())
+    {
+      max_val = (*n_max)["value"].to_float64();
+      max_found = true;
+      (*output)["value/" + name + "/max_val"] = max_val;
+    }
+
+    // default num bins
+    (*output)["value/" + name + "/num_bins"] = 256;
+
+    if(!n_num_bins->dtype().is_empty())
+    {
+      (*output)["value/" + name + "/num_bins"] =
+          (*n_num_bins)["value"].to_int32();
+    }
+
+    if(min_found && max_found && min_val >= max_val)
+    {
+      delete output;
+      ASCENT_ERROR("Binning Axis: axis with name '"
+                   << name << "': min_val (" << min_val
+                   << ") must be smaller than max_val (" << max_val << ")");
     }
   }
 
-  (*output)["type"] = "aabb";
-  (*output)["attrs/min/value"].set(min_vec, 3);
-  (*output)["attrs/min/type"] = "vector";
-  (*output)["attrs/max/value"].set(max_vec, 3);
-  (*output)["attrs/max/type"] = "vector";
+  (*output)["value/" + name + "/clamp"] = 0;
+  if(!n_clamp->dtype().is_empty())
+  {
+    (*output)["value/" + name + "/clamp"] = (*n_clamp)["value"].to_int32();
+  }
 
-  resolve_symbol_result(graph(), output, this->name());
+  (*output)["value/" + name];
+  (*output)["type"] = "axis";
   set_output(output);
 }
 
+
+//*****************************************************************************
+// ExprMeshBinningBinByIndex
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-Topo::Topo() : Filter()
+ExprMeshBinningBinByIndex::ExprMeshBinningBinByIndex()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Topo::~Topo()
+ExprMeshBinningBinByIndex::~ExprMeshBinningBinByIndex()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Topo::declare_interface(Node &i)
+ExprMeshBinningBinByIndex::declare_interface(Node &i)
 {
-  i["type_name"] = "topo";
-  i["port_names"].append() = "arg1";
+  i["type_name"] = "expr_mesh_binning_bin_by_index";
+  i["port_names"].append() = "binning";
+  i["port_names"].append() = "index";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Topo::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprMeshBinningBinByIndex::verify_params(const conduit::Node ¶ms,
+                                         conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -4351,68 +4556,92 @@ Topo::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-Topo::execute()
+ExprMeshBinningBinByIndex::execute()
 {
-  const conduit::Node *arg1 = input("arg1");
-
-  const std::string topo = (*arg1)["value"].as_string();
+  conduit::Node &in_binning = *input("binning");
+  conduit::Node &in_index =  *input("index");
+  conduit::Node *output = new conduit::Node();
 
-  if(!graph().workspace().registry().has_entry("dataset"))
+  const int num_axes = in_binning["attrs/bin_axes"].number_of_children();
+  if(num_axes > 1)
   {
-    ASCENT_ERROR("Topo: Missing dataset");
+    ASCENT_ERROR("bin: only one axis is implemented");
   }
 
-  DataObject *data_object =
-    graph().workspace().registry().fetch("dataset");
-  const conduit::Node *const dataset = data_object->as_low_order_bp().get();
+  int bindex = in_index["value"].to_int32();
 
-  if(!has_topology(*dataset, topo))
+  const conduit::Node &axis = in_binning["attrs/bin_axes/value"].child(0);
+  const int num_bins = axis["num_bins"].to_int32();
+
+  if(bindex < 0 || bindex >= num_bins)
   {
-    std::set names = topology_names(*dataset);
-    std::stringstream msg;
-    msg<<"Unknown topology: '"<name());
   set_output(output);
 }
 
-//-----------------------------------------------------------------------------
+//*****************************************************************************
+// ExprMeshBinningPointAndAxis
+//*****************************************************************************
 
 //-----------------------------------------------------------------------------
-Nan::Nan() : Filter()
+ExprMeshBinningPointAndAxis::ExprMeshBinningPointAndAxis()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Nan::~Nan()
+ExprMeshBinningPointAndAxis::~ExprMeshBinningPointAndAxis()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Nan::declare_interface(Node &i)
+ExprMeshBinningPointAndAxis::declare_interface(Node &i)
 {
-  i["type_name"] = "nan";
-  i["port_names"] = DataType::empty();
+  i["type_name"] = "expr_mesh_binning_point_and_axis";
+  i["port_names"].append() = "binning";
+  i["port_names"].append() = "axis";
+  i["port_names"].append() = "threshold";
+  i["port_names"].append() = "point";
+  i["port_names"].append() = "miss_value";
+  i["port_names"].append() = "direction";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Nan::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprMeshBinningPointAndAxis::verify_params(const conduit::Node ¶ms,
+                                           conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -4421,41 +4650,135 @@ Nan::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-Nan::execute()
+ExprMeshBinningPointAndAxis::execute()
 {
+  conduit::Node &in_binning = *input("binning");
+  conduit::Node &in_axis =  *input("axis");
+  conduit::Node &in_threshold =  *input("threshold");
+  conduit::Node &in_point =  *input("point");
+  conduit::Node &n_miss_val =  *input("miss_value");
+  conduit::Node &n_dir =  *input("direction");
   conduit::Node *output = new conduit::Node();
 
-  (*output)["type"] = "double";
-  (*output)["value"] = nan("");;
+  const int num_axes = in_binning["attrs/bin_axes"].number_of_children();
+  if(num_axes > 1)
+  {
+    ASCENT_ERROR("point_and_axis: only one axis is implemented");
+  }
+
+  int direction = 1;
+  if(!n_dir.dtype().is_empty())
+  {
+    direction = n_dir["value"].to_int32();
+    if(direction != 1 && direction != -1)
+    {
+      ASCENT_ERROR("point_and_axis: invalid direction `"<::max();
+  int index = -1;
+  for(int i = 0; i < num_bins; ++i)
+  {
+    double val = bins[i];
+    if(val > threshold)
+    {
+      double left = min_val + double(i) * bin_size;
+      double right = min_val + double(i+1) * bin_size;
+      double center = left + (right-left) / 2.0;
+      double dist = center - point;
+      // skip if distance is behind
+      bool behind = dist * double(direction) < 0;
+
+      if(!behind && dist < min_dist)
+      {
+        min_dist = dist;
+        index = i;
+      }
+    }
+  }
+
+  double bin_value = std::numeric_limits::quiet_NaN();
+
+  if(!n_miss_val.dtype().is_empty())
+  {
+    bin_value = n_miss_val["value"].to_float64();
+  }
+
+  // init with miss
+  double bin_min = bin_value;
+  double bin_max = bin_value;
+  double bin_center = bin_value;
+
+  if(index != -1)
+  {
+    bin_value = bins[index];
+    bin_min = min_val + double(index) * bin_size;
+    bin_max = min_val + double(index+1) * bin_size;
+    bin_center = bin_min + (bin_max-bin_min) / 2.0;
+  }
+
+  (*output)["type"] = "bin";
+
+  (*output)["attrs/value/value"] = bin_value;
+  (*output)["attrs/value/type"] = "double";
+
+  (*output)["attrs/min/value"] = bin_min;
+  (*output)["attrs/min/type"] = "double";
+
+  (*output)["attrs/max/value"] = bin_max;
+  (*output)["attrs/max/type"] = "double";
+
+  (*output)["attrs/center/value"] = bin_center;
+  (*output)["attrs/center/type"] = "double";
+
+  resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
+//*****************************************************************************
+// ExprMeshBinningMaxFromPoint
+//*****************************************************************************
+
 //-----------------------------------------------------------------------------
-Replace::Replace() : Filter()
+ExprMeshBinningMaxFromPoint::ExprMeshBinningMaxFromPoint()
+: Filter()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
-Replace::~Replace()
+ExprMeshBinningMaxFromPoint::~ExprMeshBinningMaxFromPoint()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-Replace::declare_interface(Node &i)
+ExprMeshBinningMaxFromPoint::declare_interface(Node &i)
 {
-  i["type_name"] = "replace";
-  i["port_names"].append() = "arg1";
-  i["port_names"].append() = "find";
-  i["port_names"].append() = "replace";
+  i["type_name"] = "expr_mesh_binning_max_from_point";
+  i["port_names"].append() = "binning";
+  i["port_names"].append() = "axis";
+  i["port_names"].append() = "point";
   i["output_port"] = "true";
 }
 
 //-----------------------------------------------------------------------------
 bool
-Replace::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprMeshBinningMaxFromPoint::verify_params(const conduit::Node ¶ms,
+                                           conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -4464,69 +4787,83 @@ Replace::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-Replace::execute()
+ExprMeshBinningMaxFromPoint::execute()
 {
-  const conduit::Node *n_array= input("arg1");
-  const conduit::Node *n_find = input("find");
-  const conduit::Node *n_replace = input("replace");
+  conduit::Node &in_binning = *input("binning");
+  conduit::Node &in_axis    = *input("axis");
+  conduit::Node &in_point   = *input("point");
+  conduit::Node *output     = new conduit::Node();
 
-  if(n_array->fetch_existing("type").as_string() != "array")
+  const int num_axes = in_binning["attrs/bin_axes"].number_of_children();
+  if(num_axes > 1)
   {
-    ASCENT_ERROR("replace is not an array");
+    ASCENT_ERROR("max_from_point: only one axis is implemented");
   }
 
-  if(n_find->fetch_existing("type").as_string() != "double")
-  {
-    ASCENT_ERROR("'find' is not a double");
-  }
+  const double point = in_point["value"].to_float64();
 
-  if(n_replace->fetch_existing("type").as_string() != "double")
+  const conduit::Node &axis = in_binning["attrs/bin_axes/value"].child(0);
+  const int num_bins = axis["num_bins"].to_int32();
+  const double min_val = axis["min_val"].to_float64();
+  const double max_val = axis["max_val"].to_float64();
+  const double bin_size = (max_val - min_val) / double(num_bins);
+
+  double *bins = in_binning["attrs/value/value"].value();
+  double max_bin_val = std::numeric_limits::lowest();
+  double dist_value = 0;
+  double min_dist = std::numeric_limits::max();
+  int index = -1;
+  for(int i = 0; i < num_bins; ++i)
   {
-    ASCENT_ERROR("'replace' is not a double");
+    double val = bins[i];
+    if(val >= max_bin_val)
+    {
+      double left = min_val + double(i) * bin_size;
+      double right = min_val + double(i+1) * bin_size;
+      double center = left + (right-left) / 2.0;
+      double dist = fabs(center - point);
+      if(val > max_bin_val ||
+         ((dist < min_dist) && val == max_bin_val))
+      {
+        min_dist = dist;
+        max_bin_val = val;
+        dist_value = center - point;
+        index = i;
+      }
+    }
   }
 
-  conduit::Node *output = new conduit::Node();
-  // copy the input into the ouptut
-  *output = *n_array;
-  conduit::Node &array = output->fetch_existing("value");
+  double loc[3] = {0.0, 0.0, 0.0};
+  std::string axis_str = in_axis["value"].as_string();
 
-  if(!array.dtype().is_float64())
+  if(axis_str == "z")
   {
-    ASCENT_ERROR("Replace is only implemented for doubles");
+    loc[2] = dist_value;
   }
-
-  const int size = array.dtype().number_of_elements();
-  conduit::float64 *ptr =  array.as_float64_ptr();
-  const double find = n_find->fetch_existing("value").to_float64();
-  const double replace = n_replace->fetch_existing("value").to_float64();
-
-  bool find_nan = find != find;
-
-  if( !find_nan)
+  else if (axis_str == "y")
   {
-    for(int i = 0; i < size; ++i)
-    {
-      if(ptr[i] == find)
-      {
-        ptr[i] = replace;
-      }
-    }
+    loc[1] = dist_value;
   }
   else
   {
-    for(int i = 0; i < size; ++i)
-    {
-      if(ptr[i] != ptr[i])
-      {
-        ptr[i] = replace;
-      }
-    }
+    loc[0] = dist_value;
   }
 
+  (*output)["type"] = "value_position";
+  (*output)["attrs/value/value"] = max_bin_val;
+  (*output)["attrs/value/type"] = "double";
+  (*output)["attrs/position/value"].set(loc,3);
+  (*output)["attrs/position/type"] = "vector";
+
+  (*output)["value"] = min_dist;
+  (*output)["type"] = "double";
+
+  resolve_symbol_result(graph(), output, this->name());
   set_output(output);
 }
 
 
+//-----------------------------------------------------------------------------
 };
 //-----------------------------------------------------------------------------
 // -- end ascent::runtime::expressions --
diff --git a/src/libs/ascent/runtimes/expressions/ascent_expression_filters.hpp b/src/libs/ascent/runtimes/expressions/ascent_expression_filters.hpp
index b568d1873..861ffb7b6 100644
--- a/src/libs/ascent/runtimes/expressions/ascent_expression_filters.hpp
+++ b/src/libs/ascent/runtimes/expressions/ascent_expression_filters.hpp
@@ -64,577 +64,703 @@ void binning_interface(const std::string &reduction_var,
 //-----------------------------------------------------------------------------
 
 //-----------------------------------------------------------------------------
-class NullArg : public ::flow::Filter
+// Base Language Components
+// boolean, integer, double, string, nan, null, identifier, dot access, 
+// if (conditional), binary operations (math, logical, etc)
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+class ExprBoolean : public ::flow::Filter
 {
 public:
-  NullArg();
-  ~NullArg();
+  ExprBoolean();
+  ~ExprBoolean();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Identifier : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprInteger : public ::flow::Filter
 {
 public:
-  Identifier();
-  ~Identifier();
+  ExprInteger();
+  ~ExprInteger();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class History : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprDouble : public ::flow::Filter
 {
 public:
-  History();
-  ~History();
+  ExprDouble();
+  ~ExprDouble();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class HistoryRange : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprString : public ::flow::Filter
 {
 public:
-  HistoryRange();
-  ~HistoryRange();
+  ExprString();
+  ~ExprString();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Boolean : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprNan : public ::flow::Filter
 {
 public:
-  Boolean();
-  ~Boolean();
+  ExprNan();
+  ~ExprNan();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Integer : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprNull : public ::flow::Filter
 {
 public:
-  Integer();
-  ~Integer();
+  ExprNull();
+  ~ExprNull();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Double : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprIdentifier : public ::flow::Filter
 {
 public:
-  Double();
-  ~Double();
+  ExprIdentifier();
+  ~ExprIdentifier();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class String : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprObjectDotAccess : public ::flow::Filter
 {
 public:
-  String();
-  ~String();
+  ExprObjectDotAccess();
+  ~ExprObjectDotAccess();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class BinaryOp : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprIf : public ::flow::Filter
 {
 public:
-  BinaryOp();
-  ~BinaryOp();
+  ExprIf();
+  ~ExprIf();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Cycle : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprBinaryOp : public ::flow::Filter
 {
 public:
-  Cycle();
-  ~Cycle();
+  ExprBinaryOp();
+  ~ExprBinaryOp();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Time : public ::flow::Filter
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//---------------------------------------------------------------------------//
+// Scalar Operations
+//  min, max, abs, exp, log, pow
+//---------------------------------------------------------------------------//
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+class ExprScalarMin : public ::flow::Filter
 {
 public:
-  Time();
-  ~Time();
+  ExprScalarMin();
+  ~ExprScalarMin();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class ScalarMax : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprScalarMax : public ::flow::Filter
 {
 public:
-  ScalarMax();
-  ~ScalarMax();
+  ExprScalarMax();
+  ~ExprScalarMax();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class ScalarMin : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprScalarAbs : public ::flow::Filter
 {
 public:
-  ScalarMin();
-  ~ScalarMin();
+  ExprScalarAbs();
+  ~ExprScalarAbs();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class ScalarGradient : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprScalarExp : public ::flow::Filter
 {
 public:
-  ScalarGradient();
-  ~ScalarGradient();
+  ExprScalarExp();
+  ~ExprScalarExp();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class ArrayMax : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprScalarLog : public ::flow::Filter
 {
 public:
-  ArrayMax();
-  ~ArrayMax();
+  ExprScalarLog();
+  ~ExprScalarLog();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-
-class ArrayMin : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprScalarPow : public ::flow::Filter
 {
 public:
-  ArrayMin();
-  ~ArrayMin();
+  ExprScalarPow();
+  ~ExprScalarPow();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class ArrayAvg : public ::flow::Filter
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// Vector Operations
+//   vector, vector_magnitude
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+class ExprVector : public ::flow::Filter
 {
 public:
-  ArrayAvg();
-  ~ArrayAvg();
+  ExprVector();
+  ~ExprVector();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class ArrayGradient : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprVectorMagnitude : public ::flow::Filter
 {
 public:
-  ArrayGradient();
-  ~ArrayGradient();
+  ExprVectorMagnitude();
+  ~ExprVectorMagnitude();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class FieldMax : public ::flow::Filter
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// Array Operations
+//  access, replace, max, min, avg, sum
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+class ExprArrayAccess : public ::flow::Filter
 {
 public:
-  FieldMax();
-  ~FieldMax();
+  ExprArrayAccess();
+  ~ExprArrayAccess();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class FieldMin : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprArrayReplace : public ::flow::Filter
 {
 public:
-  FieldMin();
-  ~FieldMin();
+  ExprArrayReplace();
+  ~ExprArrayReplace();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class FieldAvg : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprArrayReductionMin : public ::flow::Filter
 {
 public:
-  FieldAvg();
-  ~FieldAvg();
+  ExprArrayReductionMin();
+  ~ExprArrayReductionMin();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-
-
-class FieldSum : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprArrayReductionMax : public ::flow::Filter
 {
 public:
-  FieldSum();
-  ~FieldSum();
+  ExprArrayReductionMax();
+  ~ExprArrayReductionMax();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class ArraySum : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprArrayReductionAvg : public ::flow::Filter
 {
 public:
-  ArraySum();
-  ~ArraySum();
+  ExprArrayReductionAvg();
+  ~ExprArrayReductionAvg();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class FieldNanCount : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprArrayReductionSum : public ::flow::Filter
 {
 public:
-  FieldNanCount();
-  ~FieldNanCount();
+  ExprArrayReductionSum();
+  ~ExprArrayReductionSum();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class FieldInfCount : public ::flow::Filter
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// History Operations
+//  history, history_range, history_gradient, history_range_gradient
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+class ExprHistory: public ::flow::Filter
 {
 public:
-  FieldInfCount();
-  ~FieldInfCount();
+  ExprHistory();
+  ~ExprHistory();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Vector : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprHistoryRange : public ::flow::Filter
 {
 public:
-  Vector();
-  ~Vector();
+  ExprHistoryRange();
+  ~ExprHistoryRange();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Magnitude : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprHistoryGradient : public ::flow::Filter
 {
 public:
-  Magnitude();
-  ~Magnitude();
+  ExprHistoryGradient();
+  ~ExprHistoryGradient();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Abs : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprHistoryGradientRange : public ::flow::Filter
 {
 public:
-  Abs();
-  ~Abs();
+  ExprHistoryGradientRange();
+  ~ExprHistoryGradientRange();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// Histogram Operations
+// histogram, entropy, pdf, cdf, quantile, bin_by_value, bin_by_index
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
 
-class Exp : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprHistogram : public ::flow::Filter
 {
 public:
-  Exp();
-  ~Exp();
+  ExprHistogram();
+  ~ExprHistogram();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Log : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprHistogramEntropy : public ::flow::Filter
 {
 public:
-  Log();
-  ~Log();
+  ExprHistogramEntropy();
+  ~ExprHistogramEntropy();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Pow : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprHistogramPDF : public ::flow::Filter
 {
 public:
-  Pow();
-  ~Pow();
+  ExprHistogramPDF();
+  ~ExprHistogramPDF();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Axis : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprHistogramCDF : public ::flow::Filter
 {
 public:
-  Axis();
-  ~Axis();
+  ExprHistogramCDF();
+  ~ExprHistogramCDF();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Histogram : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class  ExprHistogramCDFQuantile : public ::flow::Filter
 {
 public:
-  Histogram();
-  ~Histogram();
+  ExprHistogramCDFQuantile();
+  ~ExprHistogramCDFQuantile();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Binning : public ::flow::Filter
+
+//-----------------------------------------------------------------------------
+class ExprHistogramBinByIndex : public ::flow::Filter
 {
 public:
-  Binning();
-  ~Binning();
+  ExprHistogramBinByIndex();
+  ~ExprHistogramBinByIndex();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Entropy : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprHistogramBinByValue : public ::flow::Filter
 {
 public:
-  Entropy();
-  ~Entropy();
+  ExprHistogramBinByValue();
+  ~ExprHistogramBinByValue();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Pdf : public ::flow::Filter
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// Mesh Operations
+// cycle, time, field, topology, bounds, lineout
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+class ExprMeshCycle : public ::flow::Filter
 {
 public:
-  Pdf();
-  ~Pdf();
+  ExprMeshCycle();
+  ~ExprMeshCycle();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Cdf : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprMeshTime : public ::flow::Filter
 {
 public:
-  Cdf();
-  ~Cdf();
+  ExprMeshTime();
+  ~ExprMeshTime();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class IfExpr : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprMeshField : public ::flow::Filter
 {
 public:
-  IfExpr();
-  ~IfExpr();
+  ExprMeshField();
+  ~ExprMeshField();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Field : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprMeshTopology : public ::flow::Filter
 {
 public:
-  Field();
-  ~Field();
+  ExprMeshTopology();
+  ~ExprMeshTopology();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Topo : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprMeshBounds : public ::flow::Filter
 {
 public:
-  Topo();
-  ~Topo();
+  ExprMeshBounds();
+  ~ExprMeshBounds();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class BinByIndex : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprMeshLineout : public ::flow::Filter
 {
 public:
-  BinByIndex();
-  ~BinByIndex();
+  ExprMeshLineout();
+  ~ExprMeshLineout();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class BinByValue : public ::flow::Filter
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// Mesh Field Operations
+//  min reduce, max reduce, avg reduce, sum reduce, nan count, inf count
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+class ExprMeshFieldReductionMin : public ::flow::Filter
 {
 public:
-  BinByValue();
-  ~BinByValue();
+  ExprMeshFieldReductionMin();
+  ~ExprMeshFieldReductionMin();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class ArrayAccess : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprMeshFieldReductionMax : public ::flow::Filter
 {
 public:
-  ArrayAccess();
-  ~ArrayAccess();
+  ExprMeshFieldReductionMax();
+  ~ExprMeshFieldReductionMax();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class DotAccess : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprMeshFieldReductionAvg : public ::flow::Filter
 {
 public:
-  DotAccess();
-  ~DotAccess();
+  ExprMeshFieldReductionAvg();
+  ~ExprMeshFieldReductionAvg();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-
-class Quantile : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprMeshFieldReductionSum : public ::flow::Filter
 {
 public:
-  Quantile();
-  ~Quantile();
+  ExprMeshFieldReductionSum();
+  ~ExprMeshFieldReductionSum();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class PointAndAxis : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class  ExprMeshFieldReductionNanCount : public ::flow::Filter
 {
 public:
-  PointAndAxis();
-  ~PointAndAxis();
+  ExprMeshFieldReductionNanCount();
+  ~ExprMeshFieldReductionNanCount();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class MaxFromPoint : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprMeshFieldReductionInfCount : public ::flow::Filter
 {
 public:
-  MaxFromPoint();
-  ~MaxFromPoint();
+  ExprMeshFieldReductionInfCount();
+  ~ExprMeshFieldReductionInfCount();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Bin : public ::flow::Filter
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// Binning Operations
+//  binning, binning_axis, bin_by_index, point_and_axis, max_from_point
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+class ExprMeshBinning : public ::flow::Filter
 {
 public:
-  Bin();
-  ~Bin();
+  ExprMeshBinning();
+  ~ExprMeshBinning();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Bounds : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprMeshBinningAxis : public ::flow::Filter
 {
 public:
-  Bounds();
-  ~Bounds();
+  ExprMeshBinningAxis();
+  ~ExprMeshBinningAxis();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Lineout : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprMeshBinningBinByIndex: public ::flow::Filter
 {
 public:
-  Lineout();
-  ~Lineout();
+  ExprMeshBinningBinByIndex();
+  ~ExprMeshBinningBinByIndex();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Nan : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprMeshBinningPointAndAxis : public ::flow::Filter
 {
 public:
-  Nan();
-  ~Nan();
+  ExprMeshBinningPointAndAxis();
+  ~ExprMeshBinningPointAndAxis();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 };
 
-class Replace : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprMeshBinningMaxFromPoint : public ::flow::Filter
 {
 public:
-  Replace();
-  ~Replace();
+  ExprMeshBinningMaxFromPoint();
+  ~ExprMeshBinningMaxFromPoint();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
diff --git a/src/libs/ascent/runtimes/expressions/ascent_expression_jit_filters.cpp b/src/libs/ascent/runtimes/expressions/ascent_expression_jit_filters.cpp
index 5414c6956..b435f7321 100644
--- a/src/libs/ascent/runtimes/expressions/ascent_expression_jit_filters.cpp
+++ b/src/libs/ascent/runtimes/expressions/ascent_expression_jit_filters.cpp
@@ -39,60 +39,12 @@ namespace runtime
 //-----------------------------------------------------------------------------
 namespace expressions
 {
-
+    
 //-----------------------------------------------------------------------------
-JitFilter::JitFilter(
-    const int num_inputs,
-    const std::shared_ptr exec_policy)
-    : Filter(), num_inputs(num_inputs), exec_policy(exec_policy)
-{
-}
-
+// -- begin ascent::runtime::expressions::detail --
 //-----------------------------------------------------------------------------
-JitFilter::~JitFilter()
+namespace detail
 {
-  // empty
-}
-
-//-----------------------------------------------------------------------------
-void
-JitFilter::declare_interface(Node &i)
-{
-  stringstream ss;
-  ss << "jit_filter_" << num_inputs << "_" << exec_policy->get_name();
-  i["type_name"] = ss.str();
-  for(int inp_num = 0; inp_num < num_inputs; ++inp_num)
-  {
-    std::stringstream ss;
-    ss << "arg" << inp_num;
-    i["port_names"].append() = ss.str();
-  }
-  i["output_port"] = "true";
-}
-
-//-----------------------------------------------------------------------------
-bool
-JitFilter::verify_params(const conduit::Node ¶ms, conduit::Node &info)
-{
-  info.reset();
-  bool res = filters::check_string("func", params, info, true);
-  res &= filters::check_string("filter_name", params, info, true);
-  if(!params.has_path("inputs"))
-  {
-    info["errors"].append() = "Missing required JitFilter parameter 'inputs'";
-    res = false;
-  }
-  else if(params["inputs"].number_of_children() != num_inputs)
-  {
-    stringstream ss;
-    ss << "Expected parameter 'inputs' to have " << num_inputs
-       << " inputs but it has " << params["inputs"].number_of_children()
-       << " inputs.";
-    info["errors"].append() = ss.str();
-    res = false;
-  }
-  return res;
-}
 
 //-----------------------------------------------------------------------------
 std::string
@@ -131,6 +83,7 @@ fused_kernel_type(const std::vector kernel_types)
   return ss.str();
 }
 
+//-----------------------------------------------------------------------------
 void
 topo_to_jitable(const std::string &topology,
                 const conduit::Node &dataset,
@@ -148,7 +101,73 @@ topo_to_jitable(const std::string &topology,
   }
   jitable.topology = topology;
 }
+}
+//-----------------------------------------------------------------------------
+// -- end ascent::runtime::expressions::detail --
+//-----------------------------------------------------------------------------
+
+//******************************************************************************
+// ExprJitFilter
+//******************************************************************************
+
+//-----------------------------------------------------------------------------
+ExprJitFilter::ExprJitFilter(
+    const int num_inputs,
+    const std::shared_ptr exec_policy)
+: Filter(),
+  num_inputs(num_inputs),
+  exec_policy(exec_policy)
+{
+}
+
+//-----------------------------------------------------------------------------
+ExprJitFilter::~ExprJitFilter()
+{
+  // empty
+}
+
+//-----------------------------------------------------------------------------
+void
+ExprJitFilter::declare_interface(Node &i)
+{
+  stringstream ss;
+  ss << "expr_jit_filter_" << num_inputs << "_" << exec_policy->get_name();
+  i["type_name"] = ss.str();
+  for(int inp_num = 0; inp_num < num_inputs; ++inp_num)
+  {
+    std::stringstream ss;
+    ss << "arg" << inp_num;
+    i["port_names"].append() = ss.str();
+  }
+  i["output_port"] = "true";
+}
 
+//-----------------------------------------------------------------------------
+bool
+ExprJitFilter::verify_params(const conduit::Node ¶ms,
+                             conduit::Node &info)
+{
+  info.reset();
+  bool res = filters::check_string("func", params, info, true);
+  res &= filters::check_string("filter_name", params, info, true);
+  if(!params.has_path("inputs"))
+  {
+    info["errors"].append() = "Missing required parameter 'inputs'";
+    res = false;
+  }
+  else if(params["inputs"].number_of_children() != num_inputs)
+  {
+    stringstream ss;
+    ss << "Expected parameter 'inputs' to have " << num_inputs
+       << " inputs but it has " << params["inputs"].number_of_children()
+       << " inputs.";
+    info["errors"].append() = ss.str();
+    res = false;
+  }
+  return res;
+}
+
+//-----------------------------------------------------------------------------
 // each jitable has kernels and dom_info
 // dom_info holds number of entries, kernel_type, and args for the dom
 // kernel_type maps to a kernel in kernels
@@ -158,8 +177,9 @@ topo_to_jitable(const std::string &topology,
 // kernel_body: code that we already generated but aren't touching (i.e. past
 // for-loops). for_body gets wrapped in a for-loop and added to kernel_body when
 // we need to generate an temporary field.
+//-----------------------------------------------------------------------------
 void
-JitFilter::execute()
+ExprJitFilter::execute()
 {
   // There are a lot of possible code paths that each rank/domain could
   // follow. All JIT code should not contain any MPI calls, but things
@@ -213,11 +233,13 @@ JitFilter::execute()
         Jitable &jitable = new_jitables.back();
         input_jitables.push_back(&jitable);
 
-        if(type == "topo")
+        if(type == "topology")
         {
           // topo is special because it can build different kernels for each
           // domain (kernel types)
-          topo_to_jitable((*inp)["value"].as_string(), *dataset, jitable);
+          detail::topo_to_jitable((*inp)["value"].as_string(),
+                                  *dataset,
+                                  jitable);
           jitable.obj = *inp;
         }
         else
@@ -234,7 +256,7 @@ JitFilter::execute()
 
           if(type == "int" || type == "double" || type == "bool")
           {
-            // force everthing to a double
+            // force everything to a double
             for(int i = 0; i < num_domains; ++i)
             {
               jitable.dom_info.child(i)["args/" + input_fname] = (*inp)["value"];
@@ -451,15 +473,17 @@ JitFilter::execute()
     // some functions need to pack the topology but don't take it in as an
     // argument. hack: add a new input jitable to the end with the topology and
     // fuse it
-    if(func == "gradient" || func == "curl" || func == "recenter" ||
-       (func == "binning_value" && !inputs.has_path("topo")))
+    if(func == "expr_jit_mesh_field_gradient" ||
+       func == "expr_jit_mesh_field_curl"     ||
+       func == "expr_jit_mesh_field_recenter" ||
+       (func == "expr_jit_mesh_binning_value" && !inputs.has_path("topo")))
     {
       new_jitables.emplace_back(num_domains);
       Jitable &jitable = new_jitables.back();
       input_jitables.push_back(&jitable);
 
       std::string topology;
-      if(func == "binning_value")
+      if(func == "expr_jit_mesh_binning_value")
       {
         // if a topology wasn't passed in get the one associated with the binning
         const int binning_port = inputs["binning/port"].to_int32();
@@ -482,7 +506,7 @@ JitFilter::execute()
       {
         topology = out_jitable->topology;
       }
-      topo_to_jitable(topology, *dataset, jitable);
+      detail::topo_to_jitable(topology, *dataset, jitable);
 
       out_jitable->fuse_vars(jitable);
     }
@@ -494,15 +518,6 @@ JitFilter::execute()
     }
     else
     {
-      // These are functions that can just be called in OCCA
-      // filter_name from the function signature : function name in OCCA
-      std::map builtin_funcs = {
-          {"field_field_max", "max"},
-          {"field_sin", "sin"},
-          {"field_sqrt", "sqrt"},
-          {"field_sqrt", "pow"},
-          {"field_abs", "abs"}};
-      const auto builtin_func_it = builtin_funcs.find(func);
       // fuse kernels
       std::unordered_set fused_kernel_types;
       for(int dom_idx = 0; dom_idx < num_domains; ++dom_idx)
@@ -518,7 +533,7 @@ JitFilter::execute()
           input_kernel_types.push_back(kernel_type);
           input_kernels.push_back(&(input_jitable->kernels.at(kernel_type)));
         }
-        const std::string out_kernel_type = fused_kernel_type(input_kernel_types);
+        const std::string out_kernel_type = detail::fused_kernel_type(input_kernel_types);
         (*out_jitable).dom_info.child(dom_idx)["kernel_type"] = out_kernel_type;
         Kernel &out_kernel = out_jitable->kernels[out_kernel_type];
         const bool not_fused =
@@ -535,59 +550,83 @@ JitFilter::execute()
                                         *out_jitable,
                                         out_kernel);
 
-        if(func == "binary_op")
+        if(func == "expr_jit_binary_op")
         {
           jitable_functions.binary_op();
         }
-        else if(builtin_func_it != builtin_funcs.cend())
+        // ---------------------------------------------------------------------
+        // These cases are functions that can just be called in OCCA
+        // Map filter_name from the function signature to function name in OCCA
+        // ---------------------------------------------------------------------
+        else if(func == "expr_jit_mesh_field_min")
+        {
+            jitable_functions.builtin_functions("min");
+        }
+        else if(func == "expr_jit_mesh_field_max")
+        {
+            jitable_functions.builtin_functions("max");
+        }
+        else if(func == "expr_jit_mesh_field_sin")
+        {
+            jitable_functions.builtin_functions("sin");
+        }
+        else if(func == "expr_jit_mesh_field_sqrt")
+        {
+            jitable_functions.builtin_functions("sqrt");
+        }
+        else if(func == "expr_jit_mesh_field_pow")
+        {
+            jitable_functions.builtin_functions("pow");
+        }
+        else if(func == "expr_jit_mesh_field_abs")
+        {
+            jitable_functions.builtin_functions("abs");
+        }
+        else if(func == "expr_jit_rand")
         {
-          jitable_functions.builtin_functions(builtin_func_it->second);
+          jitable_functions.rand();
         }
-        else if(func == "expr_dot")
+        else if(func == "expr_jit_dot")
         {
           jitable_functions.expr_dot();
         }
-        else if(func == "expr_if")
+        else if(func == "expr_jit_if")
         {
           jitable_functions.expr_if();
         }
-        else if(func == "derived_field")
+        else if(func == "expr_jit_mesh_field_constant")
         {
-          jitable_functions.derived_field();
+          jitable_functions.constant_field();
         }
-        else if(func == "vector")
+        else if(func == "expr_jit_mesh_field_vector_compose")
         {
           jitable_functions.vector();
         }
-        else if(func == "magnitude")
+        else if(func == "expr_jit_vector_magnitude")
         {
           jitable_functions.magnitude();
         }
-        else if(func == "gradient")
+        else if(func == "expr_jit_mesh_field_gradient")
         {
           jitable_functions.gradient();
         }
-        else if(func == "curl")
+        else if(func == "expr_jit_mesh_field_curl")
         {
           jitable_functions.curl();
         }
-        else if(func == "binning_value")
+        else if(func == "expr_jit_mesh_binning_paint_binning")
         {
           const int binning_port = inputs["binning/port"].to_int32();
           const conduit::Node &binning = *input(binning_port);
           jitable_functions.binning_value(binning);
         }
-        else if(func == "rand")
-        {
-          jitable_functions.rand();
-        }
-        else if(func == "recenter")
+        else if(func == "expr_jit_mesh_field_recenter")
         {
           jitable_functions.recenter();
         }
         else
         {
-          ASCENT_ERROR("JitFilter: Unknown func: '" << func << "'");
+          ASCENT_ERROR("ExprJitFilter: Unknown func: '" << func << "'");
         }
         fused_kernel_types.insert(out_kernel_type);
       }
@@ -598,11 +637,13 @@ JitFilter::execute()
       std::string field_name;
       if(params().has_path("field_name"))
       {
+        // perm name for the new node
         field_name = params()["field_name"].as_string();
       }
       else
       {
         field_name = filter_name;
+        // mark this for cleanup
         (*remove)["fields/" + filter_name];
       }
 
@@ -631,7 +672,7 @@ JitFilter::execute()
   }
   catch(...)
   {
-    errors.append() = "Unknown error occured in JIT";
+    errors.append() = "Unknown error occurred in JIT";
   }
 
   bool error = errors.number_of_children() > 0;
@@ -653,56 +694,69 @@ JitFilter::execute()
   }
 }
 //-----------------------------------------------------------------------------
-class JitFilterFactoryFunctor
+class ExprJitFilterFactoryFunctor
 {
 public:
+  //---------------------------------------------------------------------------
   static void
-  set(const int num_inputs_,
-      const std::shared_ptr exec_policy_)
+  set(const int num_inputs,
+      const std::shared_ptr exec_policy)
   {
-    num_inputs = num_inputs_;
-    exec_policy = exec_policy_;
+    // set static members
+    m_num_inputs  = num_inputs;
+    m_exec_policy = exec_policy;
   }
+
+  //---------------------------------------------------------------------------
   static Filter *
-  JitFilterFactory(const std::string &filter_type_name)
+  JitFilterFactoryFunctor(const std::string &filter_type_name)
   {
-    return new JitFilter(num_inputs, exec_policy);
+    // gen generic jit filter with # inputs and exec polic
+    return new ExprJitFilter(m_num_inputs, m_exec_policy);
   }
 
 private:
-  static int num_inputs;
-  static std::shared_ptr exec_policy;
+  static int                                       m_num_inputs;
+  static std::shared_ptr m_exec_policy;
 };
 
-// apparently I have to do this for the linker to be happy
-int JitFilterFactoryFunctor::num_inputs;
-std::shared_ptr JitFilterFactoryFunctor::exec_policy;
+//-----------------------------------------------------------------------------
+// declare ExprJitFilterFactoryFunctor static members
+int ExprJitFilterFactoryFunctor::m_num_inputs;
+std::shared_ptr ExprJitFilterFactoryFunctor::m_exec_policy;
+
 
+//-----------------------------------------------------------------------------
 std::string
 register_jit_filter(flow::Workspace &w,
                     const int num_inputs,
                     const std::shared_ptr exec_policy)
 {
-  JitFilterFactoryFunctor::set(num_inputs, exec_policy);
+  ExprJitFilterFactoryFunctor::set(num_inputs, exec_policy);
   std::stringstream ss;
-  ss << "jit_filter_" << num_inputs << "_" << exec_policy->get_name();
+  ss << "expr_jit_filter_" << num_inputs << "_" << exec_policy->get_name();
   if(!w.supports_filter_type(ss.str()))
   {
     flow::Workspace::register_filter_type(
-        ss.str(), JitFilterFactoryFunctor::JitFilterFactory);
+        ss.str(), ExprJitFilterFactoryFunctor::JitFilterFactoryFunctor);
   }
   return ss.str();
 }
 
+//******************************************************************************
+// ExprExpressionList
+//******************************************************************************
+
 //-----------------------------------------------------------------------------
-ExpressionList::ExpressionList(int num_inputs)
+ExprExpressionList::ExprExpressionList(int num_inputs)
   : Filter(),
     m_num_inputs(num_inputs)
 {
   // empty
 }
 
-ExpressionList::ExpressionList()
+//-----------------------------------------------------------------------------
+ExprExpressionList::ExprExpressionList()
   : Filter(),
     m_num_inputs(256)
 {
@@ -710,21 +764,21 @@ ExpressionList::ExpressionList()
 }
 
 //-----------------------------------------------------------------------------
-ExpressionList::~ExpressionList()
+ExprExpressionList::~ExprExpressionList()
 {
   // empty
 }
 
 //-----------------------------------------------------------------------------
 void
-ExpressionList::declare_interface(Node &i)
+ExprExpressionList::declare_interface(Node &i)
 {
-  i["type_name"] = "expr_list";
+  i["type_name"] = "expr_expr_list";
   // We can't have an arbitrary number of input ports so we choose 256
   for(int item_num = 0; item_num < m_num_inputs; ++item_num)
   {
     std::stringstream ss;
-    ss << "item" << item_num;
+    ss << "item_" << item_num;
     i["port_names"].append() = ss.str();
   }
   i["output_port"] = "true";
@@ -732,7 +786,7 @@ ExpressionList::declare_interface(Node &i)
 
 //-----------------------------------------------------------------------------
 bool
-ExpressionList::verify_params(const conduit::Node ¶ms, conduit::Node &info)
+ExprExpressionList::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 {
   info.reset();
   bool res = true;
@@ -741,7 +795,7 @@ ExpressionList::verify_params(const conduit::Node ¶ms, conduit::Node &info)
 
 //-----------------------------------------------------------------------------
 void
-ExpressionList::execute()
+ExprExpressionList::execute()
 {
   conduit::Node *output = new conduit::Node();
 
@@ -749,13 +803,12 @@ ExpressionList::execute()
   for(int item_num = 0; item_num < m_num_inputs; ++item_num)
   {
     std::stringstream ss;
-    ss << "item" << item_num;
+    ss << "item_" << item_num;
     const conduit::Node *n_item = input(ss.str());
     if(n_item->dtype().is_empty())
     {
       break;
     }
-    //output->append() = *n_item;
     value.append() = *n_item;
   }
   (*output)["type"] = "list";
@@ -764,25 +817,25 @@ ExpressionList::execute()
 
 //-----------------------------------------------------------------------------
 Filter *
-ExpressionListFilterFactoryMethod(const std::string &filter_type_name)
+ExprExpressionListFilterFactoryMethod(const std::string &filter_type_name)
 {
-  // "expr_list_" is 10 characters long
-  const std::string num_inputs_str =
-      filter_type_name.substr(10, filter_type_name.size() - 10);
+  size_t prefix_size = std::char_traits::length("expr_expr_list_");
+  const std::string num_inputs_str = filter_type_name.substr(prefix_size,
+                                         filter_type_name.size() - prefix_size);
   const int num_inputs = std::stoi(num_inputs_str);
-  return new ExpressionList(num_inputs);
+  return new ExprExpressionList(num_inputs);
 }
-//-----------------------------------------------------------------------------
 
+//-----------------------------------------------------------------------------
 std::string
 register_expression_list_filter(flow::Workspace &w, const int num_inputs)
 {
   std::stringstream ss;
-  ss << "expr_list_" << num_inputs;
+  ss << "expr_expr_list_" << num_inputs;
   if(!w.supports_filter_type(ss.str()))
   {
     flow::Workspace::register_filter_type(ss.str(),
-                                          ExpressionListFilterFactoryMethod);
+                                         ExprExpressionListFilterFactoryMethod);
   }
   return ss.str();
 }
diff --git a/src/libs/ascent/runtimes/expressions/ascent_expression_jit_filters.hpp b/src/libs/ascent/runtimes/expressions/ascent_expression_jit_filters.hpp
index d5d57f46c..4b9c9a38f 100644
--- a/src/libs/ascent/runtimes/expressions/ascent_expression_jit_filters.hpp
+++ b/src/libs/ascent/runtimes/expressions/ascent_expression_jit_filters.hpp
@@ -30,12 +30,13 @@ namespace runtime
 namespace expressions
 {
 
-class JitFilter : public ::flow::Filter
+//-----------------------------------------------------------------------------
+class ExprJitFilter : public ::flow::Filter
 {
 public:
-  JitFilter(const int num_inputs,
+  ExprJitFilter(const int num_inputs,
             const std::shared_ptr exec_policy);
-  ~JitFilter();
+  ~ExprJitFilter();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
@@ -46,23 +47,26 @@ class JitFilter : public ::flow::Filter
   const std::shared_ptr exec_policy;
 };
 
-class ExpressionList : public ::flow::Filter
+//-----------------------------------------------------------------------------
+// TODO: IS THIS JUST FOR JIT,  OR GENERAL SUPPORT?
+//-----------------------------------------------------------------------------
+class ExprExpressionList : public ::flow::Filter
 {
-protected:
-  int m_num_inputs;
 public:
-  ExpressionList();
-  ExpressionList(int num_inputs);
-  ~ExpressionList();
+  ExprExpressionList();
+  ExprExpressionList(int num_inputs);
+  ~ExprExpressionList();
 
   virtual void declare_interface(conduit::Node &i);
   virtual bool verify_params(const conduit::Node ¶ms, conduit::Node &info);
   virtual void execute();
 
-private:
-  int num_inputs;
+protected:
+  int m_num_inputs;
+
 };
 
+//-----------------------------------------------------------------------------
 // register a JitFilter with the correct number of inputs and execution policy
 // or return its type_name if it exists
 std::string register_jit_filter(
@@ -70,6 +74,7 @@ std::string register_jit_filter(
     const int num_inputs,
     const std::shared_ptr exec_policy);
 
+//-----------------------------------------------------------------------------
 std::string register_expression_list_filter(flow::Workspace &w,
                                             const int num_inputs);
 };
diff --git a/src/libs/ascent/runtimes/expressions/ascent_expressions_ast.cpp b/src/libs/ascent/runtimes/expressions/ascent_expressions_ast.cpp
index a784a1018..7505414cb 100644
--- a/src/libs/ascent/runtimes/expressions/ascent_expressions_ast.cpp
+++ b/src/libs/ascent/runtimes/expressions/ascent_expressions_ast.cpp
@@ -23,11 +23,7 @@
 namespace detail
 {
 
-void cast_to_value()
-{
-
-}
-
+//-----------------------------------------------------------------------------
 std::string
 strip_single_quotes(const std::string str)
 {
@@ -41,6 +37,7 @@ strip_single_quotes(const std::string str)
   return stripped;
 }
 
+//-----------------------------------------------------------------------------
 std::string
 print_match_error(const std::string &fname,
                   const std::vector &pos_arg_nodes,
@@ -122,7 +119,7 @@ is_field_type(const std::string &type)
 } // namespace detail
 
 //-----------------------------------------------------------------------------
-// -- Accept Methods
+// -- Accept Methods --
 //-----------------------------------------------------------------------------
 //{{{
 void
@@ -402,13 +399,15 @@ void
 BuildGraphVisitor::visit(const ASTExpression &expr)
 {
   // placeholder to make binary op work with "not"
-  if(!w.graph().has_filter("bop_placeholder"))
+  if(!w.graph().has_filter("expr_binary_op_placeholder"))
   {
     conduit::Node placeholder_params;
     placeholder_params["value"] = true;
-    w.graph().add_filter("expr_bool", "bop_placeholder", placeholder_params);
+    w.graph().add_filter("expr_bool",
+                         "expr_binary_op_placeholder",
+                         placeholder_params);
   }
-  output["filter_name"] = "bop_placeholder";
+  output["filter_name"] = "expr_binary_op_placeholder";
   output["type"] = "bool";
 }
 
@@ -416,9 +415,9 @@ BuildGraphVisitor::visit(const ASTExpression &expr)
 void
 BuildGraphVisitor::visit(const ASTInteger &expr)
 {
-  // create a unique name for each expression so we can reuse subexpressions
+  // create a unique name for each ast leaf so we can reuse subexpressions
   std::stringstream ss;
-  ss << "integer_" << expr.m_value;
+  ss << "expr_integer_" << expr.m_value;
   const std::string verbose_name = ss.str();
   if(subexpr_cache.has_path(verbose_name))
   {
@@ -434,7 +433,7 @@ BuildGraphVisitor::visit(const ASTInteger &expr)
   else
   {
     std::stringstream ss;
-    ss << "integer_" << ast_counter++;
+    ss << "expr_integer_" << ast_counter++;
     name = ss.str();
   }
 
@@ -451,8 +450,9 @@ BuildGraphVisitor::visit(const ASTInteger &expr)
 void
 BuildGraphVisitor::visit(const ASTDouble &expr)
 {
+  // create a unique name for each ast leaf so we can reuse subexpressions
   std::stringstream ss;
-  ss << "double_" << expr.m_value;
+  ss << "expr_double_" << expr.m_value;
   const std::string verbose_name = ss.str();
   if(subexpr_cache.has_path(verbose_name))
   {
@@ -468,7 +468,7 @@ BuildGraphVisitor::visit(const ASTDouble &expr)
   else
   {
     std::stringstream ss;
-    ss << "double_" << ast_counter++;
+    ss << "expr_double_" << ast_counter++;
     name = ss.str();
   }
 
@@ -495,7 +495,7 @@ BuildGraphVisitor::visit(const ASTIdentifier &expr)
 
   // look in the cache
   std::stringstream ss;
-  ss << "ident_" << expr.m_name;
+  ss << "expr_ident_" << expr.m_name;
   const std::string name = ss.str();
   if(subexpr_cache.has_path(name))
   {
@@ -716,7 +716,7 @@ BuildGraphVisitor::visit(const ASTMethodCall &call)
     if(func.has_path("jitable"))
     {
       // jit case
-      ss << "jit_method_" << func["filter_name"].as_string() << "(";
+      ss << "expr_jit_method_" << func["filter_name"].as_string() << "(";
       bool first = true;
       for(auto const &arg : args_map)
       {
@@ -741,7 +741,7 @@ BuildGraphVisitor::visit(const ASTMethodCall &call)
       else
       {
         std::stringstream ss;
-        ss << "jit_method_" << ast_counter++ << "_"
+        ss << "expr_jit_method_" << ast_counter++ << "_"
            << func["filter_name"].as_string();
 
         name = ss.str();
@@ -778,7 +778,7 @@ BuildGraphVisitor::visit(const ASTMethodCall &call)
     else
     {
       // non-jit case
-      ss << "method_" << func["filter_name"].as_string() << "(";
+      ss << "expr_method_" << func["filter_name"].as_string() << "(";
       bool first = true;
       for(auto const &arg : args_map)
       {
@@ -803,7 +803,7 @@ BuildGraphVisitor::visit(const ASTMethodCall &call)
       else
       {
         std::stringstream ss;
-        ss << "method_" << ast_counter++ << "_"
+        ss << "expr_method_" << ast_counter++ << "_"
            << func["filter_name"].as_string();
         name = ss.str();
       }
@@ -814,7 +814,7 @@ BuildGraphVisitor::visit(const ASTMethodCall &call)
         if(!w.graph().has_filter("null_arg"))
         {
           conduit::Node null_params;
-          w.graph().add_filter("null_arg", "null_arg", null_params);
+          w.graph().add_filter("expr_null", "null_arg", null_params);
         }
       }
 
@@ -874,7 +874,7 @@ BuildGraphVisitor::visit(const ASTMethodCall &call)
     if(output_type == "anytype")
     {
       // the history function's return type is the type of its first argument
-      if(func["filter_name"].as_string() == "history")
+      if(func["filter_name"].as_string() == "expr_history")
       {
         output_type = (*args_map["expr_name"])["type"].as_string();
       }
@@ -950,7 +950,7 @@ BuildGraphVisitor::visit(const ASTIfExpr &expr)
   if(output_type == "jitable")
   {
     std::stringstream ss;
-    ss << "jit_if_" << n_condition["filter_name"].as_string() << "_then_"
+    ss << "expr_jit_if_" << n_condition["filter_name"].as_string() << "_then_"
        << n_if["filter_name"].as_string() << "_else_"
        << n_else["filter_name"].as_string();
     verbose_name = ss.str();
@@ -966,7 +966,7 @@ BuildGraphVisitor::visit(const ASTIfExpr &expr)
     else
     {
       std::stringstream ss;
-      ss << "jit_if_" << ast_counter++;
+      ss << "expr_jit_if_" << ast_counter++;
       name = ss.str();
     }
     conduit::Node params;
@@ -1057,7 +1057,7 @@ BuildGraphVisitor::visit(const ASTBinaryOp &expr)
 
   std::stringstream ss;
   // flow doesn't like it when we have a / in the filter name
-  ss << "binary_op"
+  ss << "expr_binary_op"
      << "(" << l_in["filter_name"].as_string()
      << (op_str == "/" ? "div" : op_str) << r_in["filter_name"].as_string()
      << ")";
@@ -1074,7 +1074,7 @@ BuildGraphVisitor::visit(const ASTBinaryOp &expr)
   else
   {
     std::stringstream ss;
-    ss << "binary_op_" << ast_counter++;
+    ss << "expr_binary_op_" << ast_counter++;
     name = ss.str();
   }
 
@@ -1085,6 +1085,9 @@ BuildGraphVisitor::visit(const ASTBinaryOp &expr)
   std::string output_type;
   if(detail::is_math(op_str))
   {
+    // TODO
+    // this mapping means any field ops only map to jit
+    // we need to control this better
     if((detail::is_scalar(l_type) && detail::is_field_type(r_type)) ||
        (detail::is_scalar(r_type) && detail::is_field_type(l_type)) ||
        (detail::is_field_type(l_type) && detail::is_field_type(r_type)))
@@ -1155,9 +1158,8 @@ BuildGraphVisitor::visit(const ASTBinaryOp &expr)
 
   if(output_type == "jitable")
   {
-
     conduit::Node params;
-    params["func"] = "binary_op";
+    params["func"] = "expr_jit_binary_op";
     params["filter_name"] = name;
     params["op_string"] = op_str;
     conduit::Node &l_param = params["inputs/lhs"];
@@ -1198,7 +1200,7 @@ BuildGraphVisitor::visit(const ASTString &expr)
   std::string stripped = detail::strip_single_quotes(expr.m_name);
 
   std::stringstream ss;
-  ss << "string_" << stripped;
+  ss << "expr_string_" << stripped;
   const std::string name = ss.str();
   if(subexpr_cache.has_path(name))
   {
@@ -1229,7 +1231,7 @@ BuildGraphVisitor::visit(const ASTBoolean &expr)
   }
 
   std::stringstream ss;
-  ss << "bool_" << value;
+  ss << "expr_bool_" << value;
   const std::string name = ss.str();
   if(subexpr_cache.has_path(name))
   {
@@ -1256,7 +1258,7 @@ BuildGraphVisitor::visit(const ASTArrayAccess &expr)
   conduit::Node n_index = output;
 
   std::stringstream ss;
-  ss << "array_access_" << n_array["filter_name"].as_string() << "["
+  ss << "expr_array_access_" << n_array["filter_name"].as_string() << "["
      << n_index["filter_name"].as_string() << "]";
   const std::string name = ss.str();
   if(subexpr_cache.has_path(name))
@@ -1278,7 +1280,7 @@ BuildGraphVisitor::visit(const ASTArrayAccess &expr)
     ASCENT_ERROR("Cannot get index of non-array type: " << obj_type);
   }
 
-  w.graph().add_filter("expr_array", name, params);
+  w.graph().add_filter("expr_array_access", name, params);
 
   // src, dest, port
   w.graph().connect(n_array["filter_name"].as_string(), name, "array");
@@ -1295,18 +1297,19 @@ void
 BuildGraphVisitor::visit(const ASTDotAccess &expr)
 {
   expr.obj->accept(this);
-  const conduit::Node input_obj = output;
 
+  // input is broadly an expr name "object"
+  const conduit::Node input_obj = output;
   std::string obj_type = input_obj["type"].as_string();
 
-  // load the object table
+  // load the object table to find what type of object
   if(!w.registry().has_entry("object_table"))
   {
     ASCENT_ERROR("Missing object table");
   }
   conduit::Node *o_table = w.registry().fetch("object_table");
 
-  // get the object
+  // get the object's attribute type def
   if(!o_table->has_path(obj_type))
   {
     ASCENT_ERROR("Cannot get attribute of non-object type: '"
@@ -1314,7 +1317,7 @@ BuildGraphVisitor::visit(const ASTDotAccess &expr)
   }
   const conduit::Node &o_table_obj = (*o_table)[obj_type];
 
-  // resolve attribute type
+  // check if the attribute name ask for exists
   std::string path = "attrs/" + expr.name + "/type";
   if(!o_table_obj.has_path(path))
   {
@@ -1324,7 +1327,7 @@ BuildGraphVisitor::visit(const ASTDotAccess &expr)
       std::string attr_yaml = o_table_obj["attrs"].to_yaml();
       if(attr_yaml == "")
       {
-        ss << " No know attribtues.";
+        ss << " No known attributes.";
       }
       else
       {
@@ -1342,10 +1345,12 @@ BuildGraphVisitor::visit(const ASTDotAccess &expr)
 
   std::string f_name;
   std::string verbose_name;
+
+  // identify and map to jit case
   if(o_table->has_path(expr.name + "/jitable") || output_type == "jitable")
   {
     std::stringstream ss;
-    ss << "jit_dot_(" << input_obj["filter_name"].as_string() << ")__"
+    ss << "expr_jit_dot_(" << input_obj["filter_name"].as_string() << ")__"
        << expr.name;
     verbose_name = ss.str();
     if(subexpr_cache.has_path(verbose_name))
@@ -1360,7 +1365,7 @@ BuildGraphVisitor::visit(const ASTDotAccess &expr)
     else
     {
       std::stringstream ss;
-      ss << "jit_dot_" << ast_counter++ << "__" << expr.name;
+      ss << "expr_jit_dot_" << ast_counter++ << "__" << expr.name;
       f_name = ss.str();
     }
 
@@ -1369,8 +1374,9 @@ BuildGraphVisitor::visit(const ASTDotAccess &expr)
     {
       jit_filter_obj["type"] = "jitable";
     }
+
     conduit::Node params;
-    params["func"] = "expr_dot";
+    params["func"] = "expr_jit_dot";
     params["filter_name"] = f_name;
     params["inputs/obj"] = jit_filter_obj;
     params["inputs/obj/port"] = 0;
@@ -1380,10 +1386,10 @@ BuildGraphVisitor::visit(const ASTDotAccess &expr)
     // src, dest, port
     w.graph().connect(input_obj["filter_name"].as_string(), f_name, 0);
   }
-  else
+  else // non jit case
   {
     std::stringstream ss;
-    ss << "dot_(" << input_obj["filter_name"].as_string() << ")__" << expr.name;
+    ss << "expr_dot_(" << input_obj["filter_name"].as_string() << ")__" << expr.name;
     verbose_name = ss.str();
     if(subexpr_cache.has_path(verbose_name))
     {
@@ -1397,7 +1403,7 @@ BuildGraphVisitor::visit(const ASTDotAccess &expr)
     else
     {
       std::stringstream ss;
-      ss << "dot_" << ast_counter++ << "__" << expr.name;
+      ss << "expr_dot_" << ast_counter++ << "__" << expr.name;
       f_name = ss.str();
     }
 
@@ -1421,7 +1427,7 @@ BuildGraphVisitor::visit(const ASTExpressionList &list)
   const size_t list_size = list.exprs.size();
 
   std::stringstream ss;
-  ss << "list_[";
+  ss << "expr_list_[";
   std::vector items;
   for(size_t i = 0; i < list_size; ++i)
   {
@@ -1447,7 +1453,7 @@ BuildGraphVisitor::visit(const ASTExpressionList &list)
   else
   {
     std::stringstream ss;
-    ss << "list_" << ast_counter++;
+    ss << "expr_list_" << ast_counter++;
     name = ss.str();
   }
 
diff --git a/src/libs/ascent/runtimes/expressions/ascent_expressions_ast.hpp b/src/libs/ascent/runtimes/expressions/ascent_expressions_ast.hpp
index 3c11515c9..1ade95a61 100644
--- a/src/libs/ascent/runtimes/expressions/ascent_expressions_ast.hpp
+++ b/src/libs/ascent/runtimes/expressions/ascent_expressions_ast.hpp
@@ -4,8 +4,8 @@
 // other details. No copyright assignment is required to contribute to Ascent.
 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
 
-#ifndef ASCENT_RUNTIME_AST
-#define ASCENT_RUNTIME_AST
+#ifndef ASCENT_RUNTIME_EXPRESSIONS_AST
+#define ASCENT_RUNTIME_EXPRESSIONS_AST
 
 #include "ascent_derived_jit.hpp"
 #include "flow_workspace.hpp"
@@ -17,6 +17,7 @@ namespace expressions = ascent::runtime::expressions;
 
 class ASTVisitor;
 
+//-----------------------------------------------------------------------------
 class ASTNode
 {
 public:
@@ -26,12 +27,14 @@ class ASTNode
   virtual void accept(ASTVisitor *visitor) const = 0;
 };
 
+//-----------------------------------------------------------------------------
 class ASTExpression : public ASTNode
 {
 public:
   virtual void accept(ASTVisitor *visitor) const override;
 };
 
+//-----------------------------------------------------------------------------
 class ASTIdentifier : public ASTExpression
 {
 public:
@@ -42,6 +45,7 @@ class ASTIdentifier : public ASTExpression
   virtual void accept(ASTVisitor *visitor) const override;
 };
 
+//-----------------------------------------------------------------------------
 class ASTNamedExpression : public ASTExpression
 {
 public:
@@ -60,8 +64,10 @@ class ASTNamedExpression : public ASTExpression
   }
 };
 
+//-----------------------------------------------------------------------------
 using ASTNamedExpressionList = std::vector;
 
+//-----------------------------------------------------------------------------
 class ASTBlock : public ASTNode
 {
 public:
@@ -85,6 +91,7 @@ class ASTBlock : public ASTNode
   }
 };
 
+//-----------------------------------------------------------------------------
 class ASTInteger : public ASTExpression
 {
 public:
@@ -95,6 +102,7 @@ class ASTInteger : public ASTExpression
   virtual void accept(ASTVisitor *visitor) const override;
 };
 
+//-----------------------------------------------------------------------------
 class ASTDouble : public ASTExpression
 {
 public:
@@ -105,6 +113,7 @@ class ASTDouble : public ASTExpression
   virtual void accept(ASTVisitor *visitor) const override;
 };
 
+//-----------------------------------------------------------------------------
 class ASTString : public ASTExpression
 {
 public:
@@ -115,6 +124,7 @@ class ASTString : public ASTExpression
   virtual void accept(ASTVisitor *visitor) const override;
 };
 
+//-----------------------------------------------------------------------------
 class ASTBoolean : public ASTExpression
 {
 public:
@@ -125,6 +135,7 @@ class ASTBoolean : public ASTExpression
   virtual void accept(ASTVisitor *visitor) const override;
 };
 
+//-----------------------------------------------------------------------------
 class ASTExpressionList : public ASTExpression
 {
 public:
@@ -140,6 +151,7 @@ class ASTExpressionList : public ASTExpression
   }
 };
 
+//-----------------------------------------------------------------------------
 class ASTArguments
 {
 public:
@@ -166,6 +178,7 @@ class ASTArguments
   }
 };
 
+//-----------------------------------------------------------------------------
 class ASTMethodCall : public ASTExpression
 {
 public:
@@ -187,6 +200,7 @@ class ASTMethodCall : public ASTExpression
   }
 };
 
+//-----------------------------------------------------------------------------
 class ASTBinaryOp : public ASTExpression
 {
 public:
@@ -206,6 +220,7 @@ class ASTBinaryOp : public ASTExpression
   }
 };
 
+//-----------------------------------------------------------------------------
 class ASTIfExpr : public ASTExpression
 {
 public:
@@ -228,6 +243,7 @@ class ASTIfExpr : public ASTExpression
   }
 };
 
+//-----------------------------------------------------------------------------
 class ASTArrayAccess : public ASTExpression
 {
 public:
@@ -246,6 +262,7 @@ class ASTArrayAccess : public ASTExpression
   }
 };
 
+//-----------------------------------------------------------------------------
 class ASTDotAccess : public ASTExpression
 {
 public:
@@ -263,7 +280,9 @@ class ASTDotAccess : public ASTExpression
   }
 };
 
+//-----------------------------------------------------------------------------
 // abstract base class for visiting ASTs using the visitor pattern
+//-----------------------------------------------------------------------------
 class ASTVisitor
 {
 public:
@@ -286,6 +305,9 @@ class ASTVisitor
   virtual void visit(const ASTExpressionList &list) = 0;
 };
 
+//-----------------------------------------------------------------------------
+// visitor that prints info
+//-----------------------------------------------------------------------------
 class PrintVisitor final : public ASTVisitor
 {
 public:
@@ -305,6 +327,9 @@ class PrintVisitor final : public ASTVisitor
   void visit(const ASTExpressionList &list) override;
 };
 
+//-----------------------------------------------------------------------------
+// main visitor that builds a flow graph from a parsed AST
+//-----------------------------------------------------------------------------
 class BuildGraphVisitor final : public ASTVisitor
 {
 public:
diff --git a/src/libs/ascent/runtimes/expressions/ascent_jit_fusion.cpp b/src/libs/ascent/runtimes/expressions/ascent_jit_fusion.cpp
index 304c8723e..3f3475d97 100644
--- a/src/libs/ascent/runtimes/expressions/ascent_jit_fusion.cpp
+++ b/src/libs/ascent/runtimes/expressions/ascent_jit_fusion.cpp
@@ -377,7 +377,7 @@ JitableFusion::expr_dot()
                                                 << "' of field at runtime.");
     }
   }
-  else if(obj["type"].as_string() == "topo")
+  else if(obj["type"].as_string() == "topology")
   {
     // needs to run for every domain not just every kernel type to
     // populate entries
@@ -444,7 +444,7 @@ JitableFusion::expr_if()
 }
 
 void
-JitableFusion::derived_field()
+JitableFusion::constant_field()
 {
   // setting association and topology should run once for Jitable not for
   // each domain, but won't hurt
@@ -455,7 +455,7 @@ JitableFusion::derived_field()
     const std::string &new_association = string_obj["value"].as_string();
     if(new_association != "vertex" && new_association != "element")
     {
-      ASCENT_ERROR("derived_field: Unknown association '"
+      ASCENT_ERROR("constant_field: Unknown association '"
                    << new_association
                    << "'. Known associations are 'vertex' and 'element'.");
     }
@@ -502,9 +502,9 @@ JitableFusion::derived_field()
         if(new_entries != cur_entries)
         {
           ASCENT_ERROR(
-              "derived_field: cannot put a derived field with "
+              "constant_field: cannot put a constant field with "
               << cur_entries << " entries as a " << out_jitable.association
-              << "-associated derived field on the topology '" << new_topology
+              << "-associated field on the topology '" << new_topology
               << "' since the resulting field would need to have "
               << new_entries << " entries.");
         }
diff --git a/src/libs/ascent/runtimes/expressions/ascent_jit_fusion.hpp b/src/libs/ascent/runtimes/expressions/ascent_jit_fusion.hpp
index 0c5d44aa6..60f3169af 100644
--- a/src/libs/ascent/runtimes/expressions/ascent_jit_fusion.hpp
+++ b/src/libs/ascent/runtimes/expressions/ascent_jit_fusion.hpp
@@ -56,7 +56,7 @@ class JitableFusion
   void builtin_functions(const std::string &function_name);
   void expr_dot();
   void expr_if();
-  void derived_field();
+  void constant_field();
   void gradient();
   void curl();
   void recenter();
diff --git a/src/libs/ascent/runtimes/expressions/ascent_memory_interface.hpp b/src/libs/ascent/runtimes/expressions/ascent_memory_interface.hpp
deleted file mode 100644
index 8cfd56f3f..000000000
--- a/src/libs/ascent/runtimes/expressions/ascent_memory_interface.hpp
+++ /dev/null
@@ -1,394 +0,0 @@
-#ifndef ASCENT_MEMORY_INTERFACE_HPP
-#define ASCENT_MEMORY_INTERFACE_HPP
-
-#include 
-#include "ascent_execution_policies.hpp"
-#include "ascent_memory_manager.hpp"
-#include 
-
-namespace ascent
-{
-
-// TODO conduit::index_t ?
-using index_t = conduit::int64;
-
-template
-inline bool is_conduit_type(const conduit::Node &values);
-
-template<>
-inline bool is_conduit_type(const conduit::Node &values)
-{
-  return values.dtype().is_float64();
-}
-
-template<>
-inline bool is_conduit_type(const conduit::Node &values)
-{
-  return values.dtype().is_float32();
-}
-
-template<>
-inline bool is_conduit_type(const conduit::Node &values)
-{
-  return values.dtype().is_int32();
-}
-
-template<>
-inline bool is_conduit_type(const conduit::Node &values)
-{
-  return values.dtype().is_int64();
-}
-
-template
-inline T* conduit_ptr(conduit::Node &values);
-
-template<>
-inline conduit::float64 * conduit_ptr(conduit::Node &values)
-{
-  return values.as_float64_ptr();
-}
-
-template<>
-inline conduit::float32 * conduit_ptr(conduit::Node &values)
-{
-  return values.as_float32_ptr();
-}
-
-template<>
-inline conduit::int32 * conduit_ptr(conduit::Node &values)
-{
-  return values.as_int32_ptr();
-}
-
-template<>
-inline conduit::int64 * conduit_ptr(conduit::Node &values)
-{
-  return values.as_int64_ptr();
-}
-
-template
-struct MemoryAccessor
-{
-  const T *m_values;
-  const index_t m_size;
-  const index_t m_offset;
-  const index_t m_stride;
-
-  MemoryAccessor(const T *values, const conduit::DataType &dtype)
-    : m_values(values),
-      m_size(dtype.number_of_elements()),
-      // conduit strides and offsets are in terms of bytes
-      m_offset(dtype.offset() / sizeof(T)),
-      m_stride(dtype.stride() / sizeof(T))
-  {
-  }
-
-  ASCENT_EXEC
-  T operator[](const index_t index) const
-  {
-    return m_values[m_offset + m_stride * index];
-  }
-protected:
-  MemoryAccessor(){};
-};
-
-// rename to scalar array and don't support mcarrays
-// TODO: if we allow non-const access then we need to
-//       keep track of what is dirty
-template
-class MemoryInterface
-{
-private:
-  int m_components;
-  conduit::Node &m_field;
-  // path to manage memory
-  const std::string m_path;
-  std::vector m_sizes;
-
-public:
-  // no default constructor
-  MemoryInterface() = delete;
-
-  MemoryInterface(const conduit::Node &field, const std::string &path = "values")
-    : m_field(const_cast(field)),
-      m_path(path)
-  {
-    if(!field.has_path(path))
-    {
-      ASCENT_ERROR("Array: does have path '"<(m_field[m_path]);
-      m_sizes[0] = m_field[m_path].dtype().number_of_elements();
-    }
-    else
-    {
-      for(int i = 0; i < children; ++i)
-      {
-        types_match &= is_conduit_type(m_field[m_path].child(i));
-        m_sizes[i] = m_field[m_path].child(i).dtype().number_of_elements();
-      }
-    }
-
-    if(!types_match)
-    {
-      std::string schema = m_field.schema().to_yaml();
-      ASCENT_ERROR("Field type does not match conduit type: "<= m_sizes[comp_idx])
-    //{
-    //  std::cout<<"[Memory Interface] Invalid index "<= m_sizes[component])
-    //{
-    //  std::cout<<"[Memory Interface] Invalid index "<= m_components)
-    {
-      ASCENT_ERROR("Invalid component "< 0)
-    {
-      leaf_path = m_path + "/" + m_field[m_path].child(component).name();
-    }
-    return leaf_path;
-  }
-
-  // get the raw pointer used by conduit and return the path
-  const T *raw_ptr(int component, std::string &leaf_path)
-  {
-    leaf_path = component_path(component);
-    const T * ptr = conduit_ptr(m_field[leaf_path]);
-    return ptr;
-  }
-
-  int resolve_component(const std::string &component)
-  {
-    int component_idx = 0;
-
-    // im going to allow blank names for component 0 since
-    // an mcarray is ambiguous with a single component
-    if(m_components == 1 && component == "")
-    {
-      return component_idx;
-    }
-    else
-    {
-      const int children = m_field[m_path].number_of_children();
-      bool match = false;
-      for(int i = 0; i < children; ++i)
-      {
-        if(component == m_field[m_path].child(i).name())
-        {
-          component_idx = i;
-          match = true;
-          break;
-        }
-      }
-      if(!match)
-      {
-        ASCENT_ERROR("No component named '"<(m_field[d_path]);
-    }
-#else
-    //std::cout<<"just returning ptr\n";
-    return ptr;
-#endif
-  }
-
-  const T *host_ptr_const(int component)
-  {
-    std::string leaf_path;
-    const T * ptr = raw_ptr(component,leaf_path);
-
-#if defined(ASCENT_DEVICE_ENABLED)
-    bool is_unified;
-    bool is_gpu;
-    DeviceMemory::is_device_ptr(ptr,is_gpu, is_unified);
-    bool is_host_accessible =  !is_gpu || (is_gpu && is_unified);
-    
-    if(is_unified)
-    {
-      //std::cout<<"Unified\n";
-    }
-
-    if(is_gpu)
-    {
-      //std::cout<<"gpu\n";
-    }
-
-    if(is_host_accessible)
-    {
-      //std::cout<<"already a host pointer\n";
-      return ptr;
-    }
-    else
-    {
-      std::string h_path = "host_" + leaf_path;
-      if(!m_field.has_path(h_path))
-      {
-        //std::cout<<"Creating host pointer\n";
-        conduit::Node &n_host = m_field[h_path];
-        n_host.set_allocator(AllocationManager::conduit_host_allocator_id());
-        n_host.set(ptr, m_sizes[component]);
-      }
-      //else std::cout<<"already host_values\n";
-      return conduit_ptr(m_field[h_path]);
-    }
-#else
-    //std::cout<<"just returning ptr\n";
-    return ptr;
-#endif
-  }
-
-  // can make string param that specifies the device
-  // TODO: this will not be the way to access ptrs going forward
-  const T *ptr_const(const std::string &location = "device")
-  {
-    if(location != "host" && location != "device")
-    {
-      ASCENT_ERROR("Invalid location: '"< accessor(const std::string location = "device", const std::string comp = "")
-  {
-    if(location != "device" && location != "host")
-    {
-      ASCENT_ERROR("Bad location string '"<(ptr, m_field[leaf_path].dtype());
-  }
-
-};
-
-
-} // namespace ascent
-#endif
diff --git a/src/libs/ascent/runtimes/expressions/ascent_memory_manager.cpp b/src/libs/ascent/runtimes/expressions/ascent_memory_manager.cpp
index f7c88ea0c..c15e4d90b 100644
--- a/src/libs/ascent/runtimes/expressions/ascent_memory_manager.cpp
+++ b/src/libs/ascent/runtimes/expressions/ascent_memory_manager.cpp
@@ -304,7 +304,7 @@ DeviceMemory::allocate(size_t bytes)
                   "Cannot use DeviceMemory::alloc().");
 #endif
 
-#if defined(ASCENT_DEVICE_ENABLED)
+#if defined(ASCENT_DEVICE_ENABLED) && defined(ASCENT_UMPIRE_ENABLED)
   m_total_bytes_alloced += bytes;
   m_alloc_count++;
   auto &rm = umpire::ResourceManager::getInstance ();
@@ -334,7 +334,7 @@ DeviceMemory::deallocate(void *data_ptr)
                   "Cannot use DeviceMemory::free().");
 #endif
 
-#if defined(ASCENT_DEVICE_ENABLED)
+#if defined(ASCENT_DEVICE_ENABLED) && defined(ASCENT_UMPIRE_ENABLED)
   m_free_count++;
   auto &rm = umpire::ResourceManager::getInstance ();
   const int allocator_id = AllocationManager::device_allocator_id();
diff --git a/src/libs/ascent/runtimes/expressions/ascent_meshes.hpp b/src/libs/ascent/runtimes/expressions/ascent_meshes.hpp
deleted file mode 100644
index e6d4dcf65..000000000
--- a/src/libs/ascent/runtimes/expressions/ascent_meshes.hpp
+++ /dev/null
@@ -1,495 +0,0 @@
-#ifndef ASCENT_MESHES_HPP
-#define ASCENT_MESHES_HPP
-
-#include "ascent_memory_manager.hpp"
-#include "ascent_memory_interface.hpp"
-#include "ascent_array.hpp"
-#include "ascent_execution_policies.hpp"
-
-//-----------------------------------------------------------------------------
-// -- begin ascent:: --
-//-----------------------------------------------------------------------------
-namespace ascent
-{
-
-//-----------------------------------------------------------------------------
-// -- begin ascent::runtime --
-//-----------------------------------------------------------------------------
-namespace runtime
-{
-
-//-----------------------------------------------------------------------------
-// -- begin ascent::runtime::expressions--
-//-----------------------------------------------------------------------------
-namespace expressions
-{
-
-template
-class Vec
-{
-public:
-  T m_data[S];
-
-  ASCENT_EXEC const T &operator[] (const int &i) const
-  {
-    return m_data[i];
-  }
-
-  ASCENT_EXEC T &operator[] (const int &i)
-  {
-    return m_data[i];
-  }
-};
-
-ASCENT_EXEC
-static int num_indices(const int shape_id)
-{
-  int indices = 0;
-  if(shape_id == 5)
-  {
-    indices = 3;
-  }
-  else if(shape_id == 9)
-  {
-    indices = 4;
-  }
-  else if(shape_id == 10)
-  {
-    indices = 4;
-  }
-  else if(shape_id == 12)
-  {
-    indices = 8;
-  }
-  else if(shape_id == 1)
-  {
-    indices = 1;
-  }
-  else if(shape_id == 3)
-  {
-    indices = 2;
-  }
-  return indices;
-}
-
-
-ASCENT_EXEC
-void
-mesh_logical_index_2d(int *idx, const int vert_index, const int *dims)
-{
-  idx[0] = vert_index % dims[0];
-  idx[1] = vert_index / dims[0];
-}
-
-ASCENT_EXEC
-void
-mesh_logical_index_3d(int *idx, const int vert_index, const int *dims)
-{
-  idx[0] = vert_index % dims[0];
-  idx[1] = (vert_index / dims[0]) % dims[1];
-  idx[2] = vert_index / (dims[0] * dims[1]);
-}
-
-ASCENT_EXEC
-void structured_cell_indices(const int cell_index,
-                             const Vec &point_dims,
-                             const int dims, // 2d or 3d
-                             int indices[8])
-{
-  const int element_dims[3] = {point_dims[0]-1,
-                               point_dims[1]-1,
-                               point_dims[2]-1};
-  int element_index[3];
-  if(dims == 2)
-  {
-    mesh_logical_index_2d(element_index, cell_index, element_dims);
-
-    indices[0] = element_index[1] * point_dims[0] + element_index[0];
-    indices[1] = indices[0] + 1;
-    indices[2] = indices[1] + point_dims[0];
-    indices[3] = indices[2] - 1;
-  }
-  else
-  {
-    mesh_logical_index_3d(element_index, cell_index, element_dims);
-
-    indices[0] =
-        (element_index[2] * point_dims[1] + element_index[1])
-         * point_dims[0] + element_index[0];
-    indices[1] = indices[0] + 1;
-    indices[2] = indices[1] + point_dims[1];
-    indices[3] = indices[2] - 1;
-    indices[4] = indices[0] + point_dims[0] * point_dims[2];
-    indices[5] = indices[4] + 1;
-    indices[6] = indices[5] + point_dims[1];
-    indices[7] = indices[6] - 1;
-  }
-}
-
-struct UniformMesh
-{
-  Vec m_point_dims;
-  Vec m_origin;
-  Vec m_spacing;
-  int m_dims;
-  int m_num_cells;
-  int m_num_indices;
-  int m_num_points;
-
-  UniformMesh() = delete;
-  UniformMesh(const conduit::Node &n_coords)
-  {
-    const conduit::Node &n_dims = n_coords["dims"];
-    // assume we have a valid dataset
-    m_point_dims[0] = n_dims["i"].to_int();
-    m_point_dims[1] = n_dims["j"].to_int();
-    m_point_dims[2] = 1;
-    m_dims = 2;
-    // check for 3d
-    if(n_dims.has_path("k"))
-    {
-      m_point_dims[2] = n_dims["k"].to_int();
-      m_dims = 3;
-    }
-
-    m_origin[0] = 0.0;
-    m_origin[1] = 0.0;
-    m_origin[2] = 0.0;
-
-    m_spacing[0] = 1.0;
-    m_spacing[1] = 1.0;
-    m_spacing[2] = 1.0;
-
-    if(n_coords.has_child("origin"))
-    {
-      const conduit::Node &n_origin = n_coords["origin"];
-
-      if(n_origin.has_child("x"))
-      {
-        m_origin[0] = n_origin["x"].to_float64();
-      }
-
-      if(n_origin.has_child("y"))
-      {
-        m_origin[1] = n_origin["y"].to_float64();
-      }
-
-      if(n_origin.has_child("z"))
-      {
-        m_origin[2] = n_origin["z"].to_float64();
-      }
-    }
-
-    if(n_coords.has_path("spacing"))
-    {
-      const conduit::Node &n_spacing = n_coords["spacing"];
-
-      if(n_spacing.has_path("dx"))
-      {
-        m_spacing[0] = n_spacing["dx"].to_float64();
-      }
-
-      if(n_spacing.has_path("dy"))
-      {
-        m_spacing[1] = n_spacing["dy"].to_float64();
-      }
-
-      if(n_spacing.has_path("dz"))
-      {
-        m_spacing[2] = n_spacing["dz"].to_float64();
-      }
-    }
-
-    m_num_points = m_point_dims[0] * m_point_dims[1];
-    m_num_cells = (m_point_dims[0] - 1) *(m_point_dims[1] - 1);
-    if(m_dims == 3)
-    {
-      m_num_cells *= m_point_dims[2] - 1;
-      m_num_points = m_point_dims[2];
-    }
-
-    if(m_dims == 3)
-    {
-      m_num_indices = 8;
-    }
-    else
-    {
-      m_num_indices = 4;
-    }
-
-
-  }
-
-  ASCENT_EXEC
-  void cell_indices(const int cell_index, int indices[8]) const
-  {
-    structured_cell_indices(cell_index,
-                            m_point_dims,
-                            m_dims,
-                            indices);
-  }
-
-  ASCENT_EXEC
-  void vertex(const int vert_id, double vert[3]) const
-  {
-    int logical_idx[3];
-    int pdims[3] = {m_point_dims[0],
-                    m_point_dims[1],
-                    m_point_dims[2]};
-    if(m_dims == 2)
-    {
-      mesh_logical_index_2d(logical_idx, vert_id, pdims);
-    }
-    else
-    {
-      mesh_logical_index_3d(logical_idx, vert_id, pdims);
-    }
-
-    vert[0] = m_origin[0] + logical_idx[0] * m_spacing[0];
-    vert[1] = m_origin[1] + logical_idx[1] * m_spacing[1];
-    if(m_dims == 3)
-    {
-      vert[2] = m_origin[2] + logical_idx[2] * m_spacing[2];
-    }
-    else
-    {
-      vert[2] = 0.;
-    }
-
-  }
-
-};
-
-
-template
-struct StructuredMesh
-{
-
-  MemoryAccessor m_coords_x;
-  MemoryAccessor m_coords_y;
-  MemoryAccessor m_coords_z;
-  const int m_dims;
-  const Vec m_point_dims;
-  const int m_num_indices;
-  const int m_num_cells;
-  const int m_num_points;
-
-  StructuredMesh() = delete;
-  StructuredMesh(const std::string mem_space,
-                 MemoryInterface &coords,
-                 const int dims,
-                 const int point_dims[3])
-    : m_coords_x(coords.accessor(mem_space, "x")),
-      m_coords_y(coords.accessor(mem_space, "y")),
-      m_coords_z(dims == 3 ? coords.accessor(mem_space, "z") :
-                             // just use a dummy in this case
-                             coords.accessor(mem_space, "x")),
-      m_dims(dims),
-      m_point_dims({{point_dims[0],
-                     point_dims[1],
-                     point_dims[2]}}),
-      m_num_indices(m_dims == 2 ? 4 : 8),
-      m_num_cells(m_dims == 2 ? (m_point_dims[0] - 1) *
-                                (m_point_dims[1] - 1)
-                              : (m_point_dims[0] - 1) *
-                                (m_point_dims[1] - 1) *
-                                (m_point_dims[2] - 1)),
-      m_num_points(m_dims == 2 ? (m_point_dims[0]) *
-                                 (m_point_dims[1])
-                               : (m_point_dims[0]) *
-                                 (m_point_dims[1]) *
-                                 (m_point_dims[2]))
-  {
-  }
-
-  // TODO: some sort of error checking mechinism
-  ASCENT_EXEC
-  void cell_indices(const int cell_index, int indices[8]) const
-  {
-    structured_cell_indices(cell_index,
-                            m_point_dims,
-                            m_dims,
-                            indices);
-  }
-
-  ASCENT_EXEC
-  void vertex(const int vert_id, double vert[3]) const
-  {
-    vert[0] = static_cast(m_coords_x[vert_id]);
-    vert[1] = static_cast(m_coords_y[vert_id]);
-    if(m_dims == 3)
-    {
-      vert[2] = static_cast(m_coords_z[vert_id]);
-    }
-    else
-    {
-      vert[2] = 0.;
-    }
-  }
-
-};
-
-template
-struct RectilinearMesh
-{
-
-  MemoryAccessor m_coords_x;
-  MemoryAccessor m_coords_y;
-  MemoryAccessor m_coords_z;
-  const int m_dims;
-  const Vec m_point_dims;
-  const int m_num_indices;
-  const int m_num_cells;
-  const int m_num_points;
-
-  RectilinearMesh() = delete;
-  RectilinearMesh(const std::string mem_space,
-                  MemoryInterface &coords,
-                  const int dims)
-    : m_coords_x(coords.accessor(mem_space, "x")),
-      m_coords_y(coords.accessor(mem_space, "y")),
-      m_coords_z(dims == 3 ? coords.accessor(mem_space, "z") :
-                             // just use a dummy in this case
-                             coords.accessor(mem_space, "x")),
-      m_dims(dims),
-      m_point_dims({{(int)m_coords_x.m_size,
-                     (int)m_coords_y.m_size,
-                     (int)m_coords_z.m_size}}),
-      m_num_indices(m_dims == 2 ? 4 : 8),
-      m_num_cells(m_dims == 2 ? (m_point_dims[0] - 1) *
-                                (m_point_dims[1] - 1)
-                              : (m_point_dims[0] - 1) *
-                                (m_point_dims[1] - 1) *
-                                (m_point_dims[2] - 1)),
-      m_num_points(m_dims == 2 ? (m_point_dims[0]) *
-                                 (m_point_dims[1])
-                               : (m_point_dims[0]) *
-                                 (m_point_dims[1]) *
-                                 (m_point_dims[2]))
-  {
-  }
-
-  // TODO: some sort of error checking mechinism
-  ASCENT_EXEC
-  void cell_indices(const int cell_index, int indices[8]) const
-  {
-    structured_cell_indices(cell_index,
-                            m_point_dims,
-                            m_dims,
-                            indices);
-  }
-
-  ASCENT_EXEC
-  void vertex(const int vert_id, double vert[3]) const
-  {
-    int logical_idx[3];
-    int pdims[3] = {m_point_dims[0],
-                    m_point_dims[1],
-                    m_point_dims[2]};
-    if(m_dims == 2)
-    {
-      mesh_logical_index_2d(logical_idx, vert_id, pdims);
-    }
-    else
-    {
-      mesh_logical_index_3d(logical_idx, vert_id, pdims);
-    }
-
-    vert[0] = static_cast(m_coords_x[logical_idx[0]]);
-    vert[1] = static_cast(m_coords_y[logical_idx[1]]);
-    if(m_dims == 3)
-    {
-      vert[2] = static_cast(m_coords_z[logical_idx[2]]);
-    }
-    else
-    {
-      vert[2] = 0.;
-    }
-  }
-
-};
-
-template
-struct UnstructuredMesh
-{
-
-  MemoryAccessor m_coords_x;
-  MemoryAccessor m_coords_y;
-  MemoryAccessor m_coords_z;
-  MemoryAccessor m_conn;
-  const int m_shape_type;
-  const int m_dims;
-  const int m_num_indices;
-  const int m_num_cells;
-  const int m_num_points;
-
-  UnstructuredMesh() = delete;
-  UnstructuredMesh(const std::string mem_space,
-                   MemoryInterface &coords,
-                   MemoryInterface &conn,
-                   const int shape_type,
-                   const int dims)
-    : m_coords_x(coords.accessor(mem_space, "x")),
-      m_coords_y(coords.accessor(mem_space, "y")),
-      m_coords_z(dims == 3 ? coords.accessor(mem_space, "z") :
-                             // just use a dummy in this case
-                             coords.accessor(mem_space, "x")),
-      m_conn(conn.accessor(mem_space)),
-      m_shape_type(shape_type),
-      m_dims(dims),
-      m_num_indices(num_indices(shape_type)),
-      m_num_cells(m_conn.m_size / m_num_indices),
-      m_num_points(m_coords_x.m_size)
-
-  {
-  }
-
-  // TODO: some sort of error checking mechinism
-  ASCENT_EXEC
-  void cell_indices(const int cell_index, int indices[8]) const
-  {
-    const int offset = cell_index * m_num_indices;
-    for(int i = 0; i < m_num_indices; ++i)
-    {
-      indices[i] = static_cast(m_conn[offset + i]);
-    }
-  }
-
-  ASCENT_EXEC
-  void vertex(const int vert_id, double vert[3]) const
-  {
-    vert[0] = static_cast(m_coords_x[vert_id]);
-    vert[1] = static_cast(m_coords_y[vert_id]);
-    if(m_dims == 3)
-    {
-      vert[2] = static_cast(m_coords_z[vert_id]);
-    }
-    else
-    {
-      vert[2] = 0.;
-    }
-  }
-
-};
-
-
-
-//-----------------------------------------------------------------------------
-};
-//-----------------------------------------------------------------------------
-// -- end ascent::runtime::expressions--
-//-----------------------------------------------------------------------------
-
-//-----------------------------------------------------------------------------
-};
-//-----------------------------------------------------------------------------
-// -- end ascent::runtime --
-//-----------------------------------------------------------------------------
-
-//-----------------------------------------------------------------------------
-};
-//-----------------------------------------------------------------------------
-// -- end ascent:: --
-//-----------------------------------------------------------------------------
-
-#endif
diff --git a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_blueprint_filters.cpp b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_blueprint_filters.cpp
index 0c17cf9c6..4cb29176f 100644
--- a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_blueprint_filters.cpp
+++ b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_blueprint_filters.cpp
@@ -78,6 +78,10 @@ namespace runtime
 namespace filters
 {
 
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// BlueprintVerify
+//-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 BlueprintVerify::BlueprintVerify()
 :Filter()
@@ -209,6 +213,82 @@ BlueprintVerify::execute()
     set_output(d_input);
 }
 
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// ConduitExtract
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+ConduitExtract::ConduitExtract()
+:Filter()
+{
+// empty
+}
+
+//-----------------------------------------------------------------------------
+ConduitExtract::~ConduitExtract()
+{
+// empty
+}
+
+//-----------------------------------------------------------------------------
+void
+ConduitExtract::declare_interface(Node &i)
+{
+    i["type_name"]   = "conduit_extract";
+    i["port_names"].append() = "in";
+    i["output_port"] = "false";
+}
+
+//-----------------------------------------------------------------------------
+bool
+ConduitExtract::verify_params(const conduit::Node ¶ms,
+                              conduit::Node &info)
+{
+    info.reset();
+    bool res = true;
+
+    // so far, no params
+
+    return res;
+}
+
+//-----------------------------------------------------------------------------
+void
+ConduitExtract::execute()
+{
+    if(!input(0).check_type())
+    {
+        ASCENT_ERROR("conduit_extract input must be a DataObject");
+    }
+
+    DataObject *d_input = input(0);
+    std::shared_ptr n_input = d_input->as_node();
+
+    // squirrel a copy away in the registry where it will
+    // be connected with exec info
+
+    // add this to the extract results in the registry
+    if(!graph().workspace().registry().has_entry("extract_list"))
+    {
+      conduit::Node *extract_list = new conduit::Node();
+      graph().workspace().registry().add("extract_list",
+                                               extract_list,
+                                               -1); // TODO keep forever?
+    }
+
+    conduit::Node *extract_list = graph().workspace().registry().fetch("extract_list");
+
+    Node &einfo = extract_list->append();
+    einfo["type"] = "conduit";
+    einfo["data"].set(*n_input);
+}
+
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// BlueprintPartition
+//-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 BlueprintPartition::BlueprintPartition()
 :Filter()
@@ -287,24 +367,29 @@ BlueprintPartition::execute()
        params()["distributed"].as_string() == "false" )
     {
         conduit::blueprint::mesh::partition(*n_input,
-		     		            n_options,
-					    *n_output);
+                                            n_options,
+                                            *n_output);
     }
     else
     {
         conduit::blueprint::mpi::mesh::partition(*n_input,
-		    			         n_options,
-					         *n_output,
-					         mpi_comm);
+                                                 n_options,
+                                                 *n_output,
+                                                 mpi_comm);
     }
 #else
     conduit::blueprint::mesh::partition(*n_input,
-		     		        n_options,
-					*n_output);
+                                        n_options,
+                                        *n_output);
 #endif
     DataObject *d_output = new DataObject(n_output);
     set_output(d_output);
 }
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// DataBinning
+//-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 DataBinning::DataBinning()
 :Filter()
@@ -341,14 +426,19 @@ DataBinning::verify_params(const conduit::Node ¶ms,
       info["errors"].append() = "Missing 'reduction_op'";
     }
 
-    if(!params.has_path("var"))
+    // note: `var` is deprecated, new arg reduction_field
+    if(!params.has_path("reduction_field"))
     {
-      res = false;
-      info["errors"].append() = "Missing 'var'";
+      if(!params.has_path("var"))
+      {
+        res = false;
+        info["errors"].append() = "Missing 'reduction_field'";
+      }
     }
 
     std::vector valid_paths;
     valid_paths.push_back("reduction_op");
+    valid_paths.push_back("reduction_field");
     valid_paths.push_back("empty_bin_val");
     valid_paths.push_back("output_type");
     valid_paths.push_back("output_field");
@@ -381,7 +471,7 @@ DataBinning::verify_params(const conduit::Node ¶ms,
       if(num_axes < 1 || num_axes > 3)
       {
         res = false;
-        info["errors"].append() = "Number of axes num be between 1 and 3";
+        info["errors"].append() = "Number of axes must be between 1 and 3";
       }
       else
       {
@@ -393,16 +483,24 @@ DataBinning::verify_params(const conduit::Node ¶ms,
             res = false;
             info["errors"].append() = "Axis missing 'num_bins'";
           }
-          if(!axis.has_path("var"))
+          
+          if(!axis.has_child("field"))
           {
-            res = false;
-            info["errors"].append() = "Axis missing 'var'";
+            if(!axis.has_child("var"))
+            {
+              std::ostringstream oss;
+              oss << "Axis " << i << " missing 'field' parameter";
+              res = false;
+              info["errors"].append() = oss.str();
+            }
           }
+
           std::vector avalid_paths;
           avalid_paths.push_back("min_val");
           avalid_paths.push_back("max_val");
           avalid_paths.push_back("num_bins");
           avalid_paths.push_back("clamp");
+          avalid_paths.push_back("field");
           avalid_paths.push_back("var");
 
           surprises += surprise_check(avalid_paths, axis);
@@ -434,7 +532,21 @@ DataBinning::execute()
     std::shared_ptr n_input = d_input->as_low_order_bp();
 
     std::string reduction_op = params()["reduction_op"].as_string();
-    std::string var = params()["var"].as_string();
+    std::string reduction_field;
+
+    // `var` is deprecated, new style arg: `reduction_field`
+    if(params().has_child("reduction_field"))
+    {
+      reduction_field = params()["reduction_field"].as_string();
+    }
+    else if(params().has_child("var"))
+    {
+      reduction_field = params()["var"].as_string();
+    }
+    else
+    {
+        ASCENT_ERROR("Data Binning: Missing `reduction_field` parameter");
+    }
     conduit::Node n_component;
 
     std::string output_type = "mesh";
@@ -470,7 +582,24 @@ DataBinning::execute()
       const conduit::Node &in_axis = params()["axes"].child(i);
       // transform into a for that expressions wants
       conduit::Node &axis = n_axes.append();
-      std::string axis_name = "value/"+in_axis["var"].as_string()+"/";
+      
+      std::string axis_field_name;
+
+      if(in_axis.has_path("field"))
+      {
+        axis_field_name = in_axis["field"].as_string();
+      }
+      else if(in_axis.has_path("var"))
+      {
+        axis_field_name = in_axis["var"].as_string();
+      }
+      else
+      {
+          ASCENT_ERROR("Data Binning: axis " << i <<
+                       " is missing `field` parameter");
+      }
+
+      std::string axis_name = "value/" + axis_field_name + "/";
       axis["type"] = "axis";
       axis[axis_name+"num_bins"] = in_axis["num_bins"];
       if(in_axis.has_path("min_val"))
@@ -493,7 +622,7 @@ DataBinning::execute()
     conduit::Node n_binning;
     conduit::Node n_output_axes;
 
-    expressions::binning_interface(var,
+    expressions::binning_interface(reduction_field,
                                    reduction_op,
                                    n_empty_bin_val,
                                    n_component,
@@ -502,14 +631,13 @@ DataBinning::execute()
                                    n_binning,
                                    n_output_axes);
 
-
-
   // setup the input to the painting functions
   conduit::Node mesh_in;
   mesh_in["type"] = "binning";
   mesh_in["attrs/value/value"] = n_binning["value"];
   mesh_in["attrs/value/type"] = "array";
-  mesh_in["attrs/reduction_var/value"] = var;
+  // TODO: Re plumb binning mesh args
+  mesh_in["attrs/reduction_var/value"] = reduction_field;
   mesh_in["attrs/reduction_var/type"] = "string";
   mesh_in["attrs/reduction_op/value"] = reduction_op;
   mesh_in["attrs/reduction_op/type"] = "string";
diff --git a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_blueprint_filters.hpp b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_blueprint_filters.hpp
index df0356789..f713fe4d4 100644
--- a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_blueprint_filters.hpp
+++ b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_blueprint_filters.hpp
@@ -56,6 +56,22 @@ class ASCENT_API BlueprintVerify : public ::flow::Filter
     virtual void   execute();
 };
 
+//-----------------------------------------------------------------------------
+// In-memory conduit extract, published to registry
+//-----------------------------------------------------------------------------
+class ASCENT_API ConduitExtract: public ::flow::Filter
+{
+public:
+    ConduitExtract();
+   ~ConduitExtract();
+
+    virtual void   declare_interface(conduit::Node &i);
+    virtual bool   verify_params(const conduit::Node ¶ms,
+                                 conduit::Node &info);
+    virtual void   execute();
+};
+
+
 //-----------------------------------------------------------------------------
 class ASCENT_API BlueprintPartition : public ::flow::Filter
 {
diff --git a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_command_filters.cpp b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_command_filters.cpp
new file mode 100644
index 000000000..bab0686ba
--- /dev/null
+++ b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_command_filters.cpp
@@ -0,0 +1,216 @@
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+// Copyright (c) Lawrence Livermore National Security, LLC and other Ascent
+// Project developers. See top-level LICENSE AND COPYRIGHT files for dates and
+// other details. No copyright assignment is required to contribute to Ascent.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+
+//-----------------------------------------------------------------------------
+///
+/// file: ascent_runtime_command_filters.cpp
+///
+//-----------------------------------------------------------------------------
+
+#include "ascent_runtime_command_filters.hpp"
+
+//-----------------------------------------------------------------------------
+// thirdparty includes
+//-----------------------------------------------------------------------------
+
+#ifdef ASCENT_MPI_ENABLED
+#include 
+#endif
+
+// conduit includes
+#include 
+#include 
+
+//-----------------------------------------------------------------------------
+// ascent includes
+//-----------------------------------------------------------------------------
+#include 
+#include 
+#include 
+#include 
+
+#include 
+#include 
+
+using namespace conduit;
+using namespace std;
+
+using namespace flow;
+
+//-----------------------------------------------------------------------------
+// -- begin ascent:: --
+//-----------------------------------------------------------------------------
+namespace ascent
+{
+
+//-----------------------------------------------------------------------------
+// -- begin ascent::runtime --
+//-----------------------------------------------------------------------------
+namespace runtime
+{
+
+//-----------------------------------------------------------------------------
+// -- begin ascent::runtime::filters --
+//-----------------------------------------------------------------------------
+namespace filters
+{
+
+//-----------------------------------------------------------------------------
+Command::Command()
+:Filter()
+{
+// empty
+}
+
+//-----------------------------------------------------------------------------
+Command::~Command()
+{
+// empty
+}
+
+//-----------------------------------------------------------------------------
+void
+Command::declare_interface(Node &i)
+{
+    i["type_name"] = "command";
+    i["port_names"].append() = "in";
+    i["output_port"] = "false";
+}
+
+//-----------------------------------------------------------------------------
+bool
+Command::verify_params(const conduit::Node ¶ms,
+                       conduit::Node &info)
+{
+    info.reset();
+
+    bool has_callback = params.has_path("callback");
+    bool has_shell_command = params.has_path("shell_command");
+
+    bool res = false;
+    if (!has_callback && !has_shell_command)
+    {
+        info["errors"].append() = "There was no callback or shell command defined";
+    }
+    else if (has_callback && has_shell_command)
+    {
+        info["errors"].append() = "Both a callback and shell command are "
+                                  "present. Choose one or the other.";
+    }
+    else if(has_callback && !params["callback"].dtype().is_string())
+    {
+        info["errors"].append() = "Callbacks must be a string";  
+    }
+    else if(has_shell_command && !params["shell_command"].dtype().is_string())
+    {
+        info["errors"].append() = "Shell commands must be a string";  
+    }
+    else
+    {
+        res = true;
+    }
+
+    std::vector valid_paths;
+    valid_paths.push_back("callback");
+    valid_paths.push_back("shell_command");
+    valid_paths.push_back("mpi_behavior");
+
+    std::vector ignore_paths;
+
+    std::string surprises = surprise_check(valid_paths, ignore_paths, params);
+
+    if (surprises != "")
+    {
+        res = false;
+        info["errors"].append() = surprises;
+    }
+
+    return res;
+}
+
+//-----------------------------------------------------------------------------
+void
+Command::execute()
+{
+
+    if (!input(0).check_type())
+    {
+        ASCENT_ERROR("Command input must be a data object");
+    }
+
+    bool has_callback = params().has_path("callback");
+    std::string command_type = has_callback ? "callback" : "shell_command";
+
+    std::stringstream ss(params()[command_type].as_string());
+
+    std::vector commands;
+    std::string command;
+    while(std::getline(ss, command, '\n'))
+    {
+        commands.push_back(command);
+    }
+
+    #ifdef ASCENT_MPI_ENABLED
+    bool has_mpi_behavior = params().has_path("mpi_behavior");
+    if (has_mpi_behavior)
+    {
+        std::string mpi_behavior = params()["mpi_behavior"].as_string();
+        if (mpi_behavior == "root")
+        {
+            int comm = Workspace::default_mpi_comm();
+            int rank;
+            MPI_Comm_rank(MPI_Comm_f2c(comm), &rank);
+            if (rank == 0)
+            {
+                execute_command_list(commands, command_type);
+            }
+            return;
+        }
+    }
+    #endif
+
+    execute_command_list(commands, command_type);
+}
+
+//-----------------------------------------------------------------------------
+void
+Command::execute_command_list(const std::vector commands,
+                              const std::string &command_type)
+{
+    if (command_type == "callback")
+    {
+        conduit::Node params;
+        conduit::Node output;
+        for (int i = 0; i < commands.size(); i++)
+        {
+            ascent::execute_callback(commands.at(i), params, output);
+        }
+    } else if (command_type == "shell_command")
+    {
+        for (int i = 0; i < commands.size(); i++)
+        {
+            system(commands.at(i).c_str());
+        }
+    }
+}
+
+//-----------------------------------------------------------------------------
+};
+//-----------------------------------------------------------------------------
+// -- end ascent::runtime::filters --
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+};
+//-----------------------------------------------------------------------------
+// -- end ascent::runtime --
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+};
+//-----------------------------------------------------------------------------
+// -- end ascent:: --
+//-----------------------------------------------------------------------------
diff --git a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_command_filters.hpp b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_command_filters.hpp
new file mode 100644
index 000000000..66e61b842
--- /dev/null
+++ b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_command_filters.hpp
@@ -0,0 +1,79 @@
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+// Copyright (c) Lawrence Livermore National Security, LLC and other Ascent
+// Project developers. See top-level LICENSE AND COPYRIGHT files for dates and
+// other details. No copyright assignment is required to contribute to Ascent.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+
+//-----------------------------------------------------------------------------
+///
+/// file: ascent_runtime_command_filters.hpp
+///
+//-----------------------------------------------------------------------------
+
+#ifndef ASCENT_RUNTIME_COMMAND_FILTERS
+#define ASCENT_RUNTIME_COMMAND_FILTERS
+
+#include 
+
+#include 
+
+//-----------------------------------------------------------------------------
+// -- begin ascent:: --
+//-----------------------------------------------------------------------------
+namespace ascent
+{
+
+//-----------------------------------------------------------------------------
+// -- begin ascent::runtime --
+//-----------------------------------------------------------------------------
+namespace runtime
+{
+
+//-----------------------------------------------------------------------------
+// -- begin ascent::runtime::filters --
+//-----------------------------------------------------------------------------
+namespace filters
+{
+
+//-----------------------------------------------------------------------------
+///
+/// Filters Related to Blueprint
+///
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+class ASCENT_API Command : public ::flow::Filter
+{
+public:
+    Command();
+    ~Command();
+    virtual void declare_interface(conduit::Node &i);
+    virtual bool verify_params(const conduit::Node ¶ms,
+                               conduit::Node &info);
+    virtual void execute();
+
+    void static  execute_command_list(const std::vector commands,
+                                      const std::string &command_type);
+};
+
+};
+//-----------------------------------------------------------------------------
+// -- end ascent::runtime::filters --
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+};
+//-----------------------------------------------------------------------------
+// -- end ascent::runtime --
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+};
+//-----------------------------------------------------------------------------
+// -- end ascent:: --
+//-----------------------------------------------------------------------------
+
+#endif
+//-----------------------------------------------------------------------------
+// -- end header ifdef guard
+//-----------------------------------------------------------------------------
diff --git a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_filters.cpp b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_filters.cpp
index 127f74669..9a9eab5db 100644
--- a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_filters.cpp
+++ b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_filters.cpp
@@ -25,6 +25,7 @@
 #include 
 #include 
 #include 
+#include 
 
 #if defined(ASCENT_VTKM_ENABLED)
     #include 
@@ -86,6 +87,7 @@ register_builtin()
     AscentRuntime::register_filter_type();
     AscentRuntime::register_filter_type("extracts","flatten");
     AscentRuntime::register_filter_type("extracts","relay");
+    AscentRuntime::register_filter_type("extracts","conduit");
     AscentRuntime::register_filter_type();
     AscentRuntime::register_filter_type("extracts","htg");
 
@@ -96,9 +98,8 @@ register_builtin()
     AscentRuntime::register_filter_type();
     AscentRuntime::register_filter_type();
     AscentRuntime::register_filter_type("transforms","expression");
-
+    AscentRuntime::register_filter_type();
     AscentRuntime::register_filter_type("transforms","binning");
-    
     AscentRuntime::register_filter_type("transforms","partition");
 
 #if defined(ASCENT_VTKM_ENABLED)
@@ -106,7 +107,6 @@ register_builtin()
 
     AscentRuntime::register_filter_type();
     AscentRuntime::register_filter_type();
-
     // transforms, the current crop expect vtk-h input data
     AscentRuntime::register_filter_type("transforms","clip");
     AscentRuntime::register_filter_type("transforms","clip_with_field");
@@ -160,8 +160,6 @@ register_builtin()
     AscentRuntime::register_filter_type("transforms", "dray_vector_component");
 #endif
 
-
-
 #if defined(ASCENT_MPI_ENABLED)
     AscentRuntime::register_filter_type("extracts","hola_mpi");
 
diff --git a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_param_check.cpp b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_param_check.cpp
index 02950583c..ae249695c 100644
--- a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_param_check.cpp
+++ b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_param_check.cpp
@@ -40,6 +40,7 @@ namespace runtime
 namespace filters
 {
 
+//-----------------------------------------------------------------------------
 // this detects if the syntax is valid, not
 // whether the expression will actually work
 bool is_valid_expression(const std::string expr, std::string &err_msg)
@@ -57,6 +58,7 @@ bool is_valid_expression(const std::string expr, std::string &err_msg)
   return res;
 }
 
+//-----------------------------------------------------------------------------
 bool
 check_numeric(const std::string path,
               const conduit::Node ¶ms,
@@ -87,7 +89,7 @@ check_numeric(const std::string path,
     {
       if(supports_expressions)
       {
-        std::string msg = "Numeric parameter '" + path +
+        std::string msg = "Expected numeric parameter '" + path +
                           " : " + params[path].to_yaml()
                              + "'  is not numeric and is not a valid expression."
                              + " Error message '" + err_msg + "'";
@@ -95,7 +97,7 @@ check_numeric(const std::string path,
       }
       else
       {
-        std::string msg = "Numeric parameter '" + path +
+        std::string msg = "Expected numeric parameter '" + path +
                           " : " + params[path].to_yaml()
                              + "'  is not numeric and does not support expressions";
       }
@@ -105,6 +107,7 @@ check_numeric(const std::string path,
   return res;
 }
 
+//-----------------------------------------------------------------------------
 bool
 check_string(const std::string path,
              const conduit::Node ¶ms,
@@ -114,19 +117,100 @@ check_string(const std::string path,
   bool res = true;
   if(!params.has_path(path) && required)
   {
-    info["errors"].append() = "Missing required string parameter '" + path + "'";
+    info["errors"].append() = "Missing required string parameter '" +
+                              path + "'";
     res = false;
   }
 
   if(params.has_path(path) && !params[path].dtype().is_string())
   {
-    std::string msg = "String parameter '" + path + "' is not a string'";
+    std::string msg = "Expected string parameter '" + path +
+                      "' is not a string'";
     info["errors"].append() = msg;
     res = false;
   }
   return res;
 }
 
+//-----------------------------------------------------------------------------
+// bools are a string with "true" or "false"
+bool
+check_bool(const std::string path,
+           const conduit::Node ¶ms,
+           conduit::Node &info,
+           bool required)
+{
+  bool res = true;
+  if(!params.has_path(path) && required)
+  {
+    info["errors"].append() = "Missing required bool string parameter '" +
+                              path + "'";
+    res = false;
+  }
+
+    if(params.has_path(path))
+    {
+        if(!params[path].dtype().is_string())
+        {
+          std::string msg = "Expected bool string parameter '" + path +
+                            "' is not a string";
+          info["errors"].append() = msg;
+          res = false;
+        }
+        else
+        {
+            // get value and check true or false
+            std::string value = params[path].as_string();
+            if( value != "true" && value != "false" )
+            {
+                std::string msg = "Expected bool string parameter '" + path +
+                                  "' is not \"true\" or \"false\", " +
+                                  " value = \"" + value + "\"";
+                info["errors"].append() = msg;
+                res = false;
+            }
+        }
+    }
+
+  return res;
+}
+
+//-----------------------------------------------------------------------------
+bool
+check_object(const std::string path,
+             const conduit::Node ¶ms,
+             conduit::Node &info,
+             bool required)
+{
+    bool res = true;
+    if(!params.has_path(path) && required)
+    {
+        info["errors"].append() = "Missing required object parameter '" + path + "'";
+        res = false;
+    }
+
+    if(params.has_path(path))
+    {
+        if(!params[path].dtype().is_object())
+        {
+            std::string msg = "Expected object parameter '" + path +
+                              "' is not a object";
+            info["errors"].append() = msg;
+            res = false;
+        }
+        else if(params[path].number_of_children() == 0)
+        {
+            std::string msg = "Expected object parameter '" + path +
+                          "' has no children";
+            info["errors"].append() = msg;
+            res = false;
+        }
+    }
+
+  return res;
+}
+
+//-----------------------------------------------------------------------------
 std::string
 surprise_check(const std::vector &valid_paths,
                const std::vector &ignore_paths,
@@ -160,6 +244,7 @@ surprise_check(const std::vector &valid_paths,
   return ss.str();
 }
 
+//-----------------------------------------------------------------------------
 std::string
 surprise_check(const std::vector &valid_paths,
                const conduit::Node ¶ms)
@@ -192,6 +277,7 @@ surprise_check(const std::vector &valid_paths,
   return ss.str();
 }
 
+//-----------------------------------------------------------------------------
 void
 path_helper(std::vector &paths, const conduit::Node &node)
 {
@@ -210,6 +296,7 @@ path_helper(std::vector &paths, const conduit::Node &node)
 
 }
 
+//-----------------------------------------------------------------------------
 void
 path_helper(std::vector &paths,
             const std::vector &ignore,
@@ -241,27 +328,32 @@ path_helper(std::vector &paths,
 
 }
 
+//-----------------------------------------------------------------------------
 template
 T conduit_cast(const conduit::Node &node);
 
+//-----------------------------------------------------------------------------
 template<>
 int conduit_cast(const conduit::Node &node)
 {
   return node.to_int32();
 }
 
+//-----------------------------------------------------------------------------
 template<>
 double conduit_cast(const conduit::Node &node)
 {
   return node.to_float64();
 }
 
+//-----------------------------------------------------------------------------
 template<>
 float conduit_cast(const conduit::Node &node)
 {
   return node.to_float32();
 }
 
+//-----------------------------------------------------------------------------
 template
 T get_value(const conduit::Node &node, DataObject *dataset)
 {
@@ -279,8 +371,8 @@ T get_value(const conduit::Node &node, DataObject *dataset)
     {
       ASCENT_ERROR("Numeric parameter is an expression(string)"
                    <<" but we can not evaluate the expression."
-                   <<" This is usaully for a parameter that is "
-                   <<"not meant to have an expression. expression '"
+                   <<" This is usually for a parameter that is"
+                   <<" not meant to have an expression. expression '"
                    <(node, dataset);
 }
 
+//-----------------------------------------------------------------------------
 float get_float32(const conduit::Node &node, DataObject *dataset)
 {
   return get_value(node, dataset);
 }
 
+//-----------------------------------------------------------------------------
 int get_int32(const conduit::Node &node, DataObject *dataset)
 {
   return get_value(node, dataset);
diff --git a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_param_check.hpp b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_param_check.hpp
index 7e5ae9fe3..8c68a7f12 100644
--- a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_param_check.hpp
+++ b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_param_check.hpp
@@ -52,6 +52,16 @@ bool ASCENT_API check_string(const std::string path,
                              conduit::Node &info,
                              bool required);
 
+bool ASCENT_API check_bool(const std::string path,
+                           const conduit::Node ¶ms,
+                           conduit::Node &info,
+                           bool required);
+
+bool ASCENT_API check_object(const std::string path,
+                             const conduit::Node ¶ms,
+                             conduit::Node &info,
+                             bool required);
+
 void ASCENT_API path_helper(std::vector &paths,
                             const conduit::Node ¶ms);
 
@@ -63,17 +73,17 @@ void ASCENT_API path_helper(std::vector &paths,
 std::string ASCENT_API surprise_check(const std::vector &valid_paths,
                                       const conduit::Node &node);
 //
-// Ignore paths only ignores top level paths, deffering lower level
-// paths to another surpise check.
+// Ignore paths only ignores top level paths, differing lower level
+// paths to another surprise check.
 //
 std::string ASCENT_API surprise_check(const std::vector &valid_paths,
                                       const std::vector &ignore_paths,
                                       const conduit::Node &node);
 
-// evalute expression or return value
+// evaluate expression or return value
 double ASCENT_API get_float64(const conduit::Node &node, DataObject *dataset);
-float ASCENT_API get_float32(const conduit::Node &node, DataObject *dataset);
-int ASCENT_API get_int32(const conduit::Node &node, DataObject *dataset);
+float ASCENT_API  get_float32(const conduit::Node &node, DataObject *dataset);
+int ASCENT_API    get_int32(const conduit::Node &node, DataObject *dataset);
 
 //-----------------------------------------------------------------------------
 };
diff --git a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_relay_filters.cpp b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_relay_filters.cpp
index c00823863..359962c12 100644
--- a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_relay_filters.cpp
+++ b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_relay_filters.cpp
@@ -22,6 +22,8 @@
 #include 
 #include 
 #include 
+#include 
+#include 
 
 //-----------------------------------------------------------------------------
 // ascent includes
@@ -42,6 +44,7 @@
 // -- conduit relay mpi
 #include 
 #include 
+#include 
 #endif
 
 // std includes
@@ -77,193 +80,13 @@ namespace filters
 namespace detail
 {
 
-//-------------------------------------------------------------------------
-void
-mesh_bp_generate_index(const conduit::Node &mesh,
-                       const std::string &ref_path,
-                       int num_domains,
-                       Node &index_out)
-{
-    if(blueprint::mesh::is_multi_domain(mesh))
-    {
-        NodeConstIterator itr = mesh.children();
-
-        while(itr.has_next())
-        {
-            Node curr_idx;
-            const Node &cld = itr.next();
-            blueprint::mesh::generate_index(cld,
-                                            ref_path,
-                                            num_domains,
-                                            curr_idx);
-            // add any new entries to the running index
-            index_out.update(curr_idx);
-        }
-    }
-    else
-    {
-        blueprint::mesh::generate_index(mesh,
-                                        ref_path,
-                                        num_domains,
-                                        index_out);
-    }
-}
 
-#ifdef ASCENT_MPI_ENABLED
-//-------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+// mfem needs special fields so look for them
+//-----------------------------------------------------------------------------
 void
-mesh_bp_generate_index(const conduit::Node &mesh,
-                       const std::string &ref_path,
-                       Node &index_out,
-                       MPI_Comm comm)
-{
-    int par_rank = relay::mpi::rank(comm);
-    int par_size = relay::mpi::size(comm);
-
-    // we need a list of all possible topos, coordsets, etc
-    // for the blueprint index in the root file.
-    //
-    // across ranks, domains may be sparse
-    //  for example: a topo may only exist in one domain
-    // so we union all local mesh indices, and then
-    // se an all gather and union the results together
-    // to create an accurate global index.
-
-    index_t local_num_domains = blueprint::mesh::number_of_domains(mesh);
-    // note:
-    // find global # of domains w/o conduit_blueprint_mpi for now
-    // since we aren't yet linking conduit_blueprint_mpi
-    Node n_src, n_reduce;
-    n_src = local_num_domains;
-
-    mpi::sum_all_reduce(n_src,
-                        n_reduce,
-                        comm);
-
-    index_t global_num_domains = n_reduce.to_int();
-
-    index_out.reset();
-
-    Node local_idx, gather_idx;
-
-    if(local_num_domains > 0)
-    {
-        mesh_bp_generate_index(mesh,
-                               ref_path,
-                               global_num_domains,
-                               local_idx);
-    }
-
-    relay::mpi::all_gather_using_schema(local_idx,
-                                        gather_idx,
-                                        comm);
-
-    NodeConstIterator itr = gather_idx.children();
-    while(itr.has_next())
-    {
-        const Node &curr = itr.next();
-        index_out.update(curr);
-    }
-}
-
-#endif
-
-
-//
-// recalculate domain ids so that we are consistant.
-// Assumes that domains are valid
-//
-void make_domain_ids(conduit::Node &domains)
-{
-  int num_domains = domains.number_of_children();
-
-  int domain_offset = 0;
-
-#ifdef ASCENT_MPI_ENABLED
-  int comm_id = flow::Workspace::default_mpi_comm();
-  int comm_size = 1;
-  int rank = 0;
-
-  MPI_Comm mpi_comm = MPI_Comm_f2c(comm_id);
-  MPI_Comm_rank(mpi_comm,&rank);
-
-  MPI_Comm_size(mpi_comm, &comm_size);
-  int *domains_per_rank = new int[comm_size];
-
-  MPI_Allgather(&num_domains, 1, MPI_INT, domains_per_rank, 1, MPI_INT, mpi_comm);
-
-  for(int i = 0; i < rank; ++i)
-  {
-    domain_offset += domains_per_rank[i];
-  }
-  delete[] domains_per_rank;
-#endif
-
-  for(int i = 0; i < num_domains; ++i)
-  {
-    conduit::Node &dom = domains.child(i);
-    dom["state/domain_id"] = domain_offset + i;
-  }
-}
-//
-// This expects a single or multi_domain blueprint mesh and will iterate
-// through all domains to see if they are valid. Returns true
-// if it contains valid data and false if there is no valid
-// data.
-//
-// This is needed because after pipelines, it is possible to
-// have no data left in a domain because of something like a
-// clip
-//
-bool clean_mesh(const conduit::Node &data, conduit::Node &output)
-{
-  output.reset();
-  const int potential_doms = data.number_of_children();
-  bool maybe_multi_dom = true;
-
-  if(!data.dtype().is_object() && !data.dtype().is_list())
-  {
-    maybe_multi_dom = false;
-  }
-
-  if(maybe_multi_dom)
-  {
-    // check all the children for valid domains
-    for(int i = 0; i < potential_doms; ++i)
-    {
-      conduit::Node info;
-      const conduit::Node &child = data.child(i);
-      bool is_valid = blueprint::mesh::verify(child, info);
-      if(is_valid)
-      {
-        conduit::Node &dest_dom = output.append();
-        dest_dom.set_external(child);
-      }
-    }
-  }
-  // if there is nothing in the output, lets see if it is a
-  // valid single domain
-  if(output.number_of_children() == 0)
-  {
-    if(!data.dtype().is_empty())
-    {
-      // check to see if this is a single valid domain
-      conduit::Node info;
-      bool is_valid = blueprint::mesh::verify(data, info);
-      if(is_valid)
-      {
-        conduit::Node &dest_dom = output.append();
-        dest_dom.set_external(data);
-      }
-    }
-  }
-
-  make_domain_ids(output);
-  return output.number_of_children() > 0;
-}
-// mfem needs these special fields so look for them
-void check_for_attributes(const conduit::Node &input,
-                          std::vector &list)
+check_for_attributes(const conduit::Node &input,
+                     std::vector &list)
 {
   const int num_doms = input.number_of_children();
   std::set specials;
@@ -290,10 +113,12 @@ void check_for_attributes(const conduit::Node &input,
   }
 }
 
-void filter_fields(const conduit::Node &input,
-                   conduit::Node &output,
-                   std::vector fields,
-                   flow::Graph &graph)
+//-----------------------------------------------------------------------------
+void
+filter_fields(const conduit::Node &input,
+              conduit::Node &output,
+              std::vector fields,
+              flow::Graph &graph)
 {
   // assume this is multi-domain
   //
@@ -436,9 +261,9 @@ void filter_fields(const conduit::Node &input,
   {
     ASCENT_ERROR("Relay: field selection resulted in no data."
                  "This can occur if the fields did not exist "
-                 "in the simulaiton data or if the fields were "
+                 "in the simulation data or if the fields were "
                  "created as a result of a pipeline, but the "
-                 "relay extract did not recieve the result of "
+                 "relay extract did not receive the result of "
                  "a pipeline");
   }
 
@@ -474,7 +299,6 @@ verify_io_params(const conduit::Node ¶ms,
         res = false;
     }
 
-
     if( params.has_child("protocol") )
     {
         if(!params["protocol"].dtype().is_string())
@@ -506,6 +330,76 @@ verify_io_params(const conduit::Node ¶ms,
         }
     }
 
+    if( params.has_child("hdf5_options") )
+    {
+        //
+        // HDF5 OPTIONS Example:
+        //
+        // compact_storage:
+        //   enabled: "true"
+        //   threshold: 1024
+        // chunking:
+        //   enabled: "true"
+        //   threshold: 2000000
+        //   chunk_size: 1000000
+        //   compression:
+        //     method: "gzip"
+        //     level: 5
+
+        const Node ¶ms_hdf5_opts = params["hdf5_options"];
+
+        res &= check_object("compact_storage",
+                            params_hdf5_opts,
+                            info,
+                            false);
+
+        res &= check_bool("compact_storage/enabled",
+                            params_hdf5_opts,
+                            info,
+                            false);
+
+        res &= check_numeric("compact_storage/threshold",
+                             params_hdf5_opts,
+                             info,
+                             false);
+
+        res &= check_object("chunking",
+                            params_hdf5_opts,
+                            info,
+                            false);
+
+        res &= check_bool("chunking/enabled",
+                          params_hdf5_opts,
+                          info,
+                          false);
+
+
+        res &= check_numeric("chunking/threshold",
+                             params_hdf5_opts,
+                             info,
+                             false);
+
+        res &= check_numeric("chunking/chunk_size",
+                             params_hdf5_opts,
+                             info,
+                             false);
+
+        res &= check_object("chunking/compression",
+                            params_hdf5_opts,
+                            info,
+                            false);
+
+        res &= check_string("chunking/compression/method",
+                            params_hdf5_opts,
+                            info,
+                            false);
+
+        res &= check_numeric("chunking/compression/level",
+                             params_hdf5_opts,
+                             info,
+                             false);
+    }
+
     std::vector valid_paths;
     std::vector ignore_paths;
     valid_paths.push_back("path");
@@ -513,6 +407,7 @@ verify_io_params(const conduit::Node ¶ms,
     valid_paths.push_back("fields");
     valid_paths.push_back("num_files");
     ignore_paths.push_back("fields");
+    ignore_paths.push_back("hdf5_options");
 
     std::string surprises = surprise_check(valid_paths, ignore_paths, params);
 
@@ -525,487 +420,65 @@ verify_io_params(const conduit::Node ¶ms,
     return res;
 }
 
-//-----------------------------------------------------------------------------
-void gen_domain_to_file_map(int num_domains,
-                            int num_files,
-                            Node &out)
-{
-    int num_domains_per_file = num_domains / num_files;
-    int left_overs = num_domains % num_files;
-
-    out["global_domains_per_file"].set(DataType::int32(num_files));
-    out["global_domain_offsets"].set(DataType::int32(num_files));
-    out["global_domain_to_file"].set(DataType::int32(num_domains));
-
-    int32_array v_domains_per_file = out["global_domains_per_file"].value();
-    int32_array v_domains_offsets  = out["global_domain_offsets"].value();
-    int32_array v_domain_to_file   = out["global_domain_to_file"].value();
-
-    // setup domains per file
-    for(int f=0; f < num_files; f++)
-    {
-        v_domains_per_file[f] = num_domains_per_file;
-        if( f < left_overs)
-            v_domains_per_file[f]+=1;
-    }
-
-    // prefix sum to calc offsets
-    for(int f=0; f < num_files; f++)
-    {
-        v_domains_offsets[f] = v_domains_per_file[f];
-        if(f > 0)
-            v_domains_offsets[f] += v_domains_offsets[f-1];
-    }
-
-    // do assignment, create simple map
-    int f_idx = 0;
-    for(int d=0; d < num_domains; d++)
-    {
-        if(d >= v_domains_offsets[f_idx])
-            f_idx++;
-        v_domain_to_file[d] = f_idx;
-    }
-}
 
 //-----------------------------------------------------------------------------
 void mesh_blueprint_save(const Node &data,
                          const std::string &path,
                          const std::string &file_protocol,
                          int num_files,
+                         const Node &extra_opts,
                          std::string &root_file_out)
 {
-    // The assumption here is that everything is multi domain
-
-    Node multi_dom;
+    bool has_data = blueprint::mesh::number_of_domains(data) > 0;
+    has_data = global_someone_agrees(has_data);
 
-    bool is_valid = detail::clean_mesh(data, multi_dom);
-
-    int par_rank = 0;
-    int par_size = 1;
-    // we may not have any domains so init to max
-    int cycle = std::numeric_limits::max();
-
-    int local_boolean = is_valid ? 1 : 0;
-    int global_boolean = local_boolean;
-#ifdef ASCENT_MPI_ENABLED
-    MPI_Comm mpi_comm = MPI_Comm_f2c(Workspace::default_mpi_comm());
-    MPI_Comm_rank(mpi_comm, &par_rank);
-    MPI_Comm_size(mpi_comm, &par_size);
-
-    // check to see if any valid data exist
-    MPI_Allreduce((void *)(&local_boolean),
-                  (void *)(&global_boolean),
-                  1,
-                  MPI_INT,
-                  MPI_SUM,
-                  mpi_comm);
-#endif
-
-    if(global_boolean == 0)
+    if(!has_data)
     {
       ASCENT_INFO("Blueprint save: no valid data exists. Skipping save");
       return;
     }
 
-    int local_num_domains = multi_dom.number_of_children();
-    // figure out what cycle we are
-    if(local_num_domains > 0 && is_valid)
+    // setup our options
+    Node opts;
+    opts["number_of_files"] = num_files;
+    bool using_hdf5_opts = (file_protocol == "hdf5" &&
+                            extra_opts.number_of_children() > 0);
+    Node hdf5_opts_orig;
+    if(using_hdf5_opts)
     {
-      Node dom = multi_dom.child(0);
-      if(!dom.has_path("state/cycle"))
-      {
-        static std::map counters;
-        ASCENT_INFO("Blueprint save: no 'state/cycle' present."
-                    " Defaulting to counter");
-        cycle = counters[path];
-        counters[path]++;
-      }
-      else
-      {
-        cycle = dom["state/cycle"].to_int();
-      }
-    }
-
-#ifdef ASCENT_MPI_ENABLED
-    Node n_cycle, n_min;
-
-    n_cycle = (int)cycle;
-
-    mpi::min_all_reduce(n_cycle,
-                        n_min,
-                        mpi_comm);
-
-    cycle = n_min.as_int();
-#endif
-
-    // setup the directory
-    char fmt_buff[64] = {0};
-    snprintf(fmt_buff, sizeof(fmt_buff), "%06d",cycle);
-
-    std::string output_base_path = path;
-
-    ostringstream oss;
-    oss << output_base_path << ".cycle_" << fmt_buff;
-    string output_dir  =  oss.str();
+        // push / pop hdf5 io settings
+        Node relay_io_about;
+        conduit::relay::io::about(relay_io_about);
+        hdf5_opts_orig = relay_io_about["options/hdf5"];
 
-    bool dir_ok = false;
-
-    // let rank zero handle dir creation
-    if(par_rank == 0)
-    {
-        // check of the dir exists
-        dir_ok = conduit::utils::is_directory(output_dir);
-        if(!dir_ok)
-        {
-            // if not try to let rank zero create it
-            dir_ok = conduit::utils::create_directory(output_dir);
-        }
+        // copy
+        Node hdf5_opts_orig_curr(hdf5_opts_orig);
+        // override
+        hdf5_opts_orig_curr.update(extra_opts);
+        // set
+        conduit::relay::io::hdf5_set_options(hdf5_opts_orig_curr);
     }
-
-    int global_num_domains = local_num_domains;
-
 #ifdef ASCENT_MPI_ENABLED
-    // TODO:
-    // This a reduce to check for an error ...
-    // it will be a common pattern, how do we make this easy?
-
-    // use an mpi sum to check if the dir exists
-    Node n_src, n_reduce;
-
-    if(dir_ok)
-        n_src = (int)1;
-    else
-        n_src = (int)0;
-
-    mpi::sum_all_reduce(n_src,
-                        n_reduce,
-                        mpi_comm);
-
-    dir_ok = (n_reduce.as_int() == 1);
-
-    n_src = local_num_domains;
-
-    mpi::sum_all_reduce(n_src,
-                        n_reduce,
-                        mpi_comm);
-
-    global_num_domains = n_reduce.as_int();
-#endif
-
-
-    if(global_num_domains == 0)
-    {
-      if(par_rank == 0)
-      {
-          ASCENT_WARN("There no data to save. Doing nothing.");
-      }
-      return;
-    }
-
-
-    // zero or negative (default cases), use one file per domain
-    if(num_files <= 0)
-    {
-        num_files = global_num_domains;
-    }
-
-    // if global domains > num_files, warn and use one file per domain
-    if(global_num_domains < num_files)
-    {
-        ASCENT_INFO("Requested more files than actual domains, "
-                    "writing one file per domain");
-        num_files = global_num_domains;
-    }
-
-    if(!dir_ok)
-    {
-        ASCENT_ERROR("Error: failed to create directory " << output_dir);
-    }
-
-    if(global_num_domains == num_files)
-    {
-        // write out each domain
-        for(int i = 0; i < local_num_domains; ++i)
-        {
-            const Node &dom = multi_dom.child(i);
-            uint64 domain = dom["state/domain_id"].to_uint64();
-
-            snprintf(fmt_buff, sizeof(fmt_buff), "%06llu",domain);
-            oss.str("");
-            oss << "domain_" << fmt_buff << "." << file_protocol;
-            string output_file  = conduit::utils::join_file_path(output_dir,oss.str());
-            relay::io::save(dom, output_file);
-        }
-    }
-    else // more complex case
-    {
-        //
-        // recall: we have re-labeled domain ids from 0 - > N-1, however
-        // some mpi tasks may have no data.
-        //
-
-        // books we keep:
-
-        Node books;
-        books["local_domain_to_file"].set(DataType::int32(local_num_domains));
-        books["local_domain_status"].set(DataType::int32(local_num_domains));
-        books["local_file_batons"].set(DataType::int32(num_files));
-        books["global_file_batons"].set(DataType::int32(num_files));
-
-        // local # of domains
-        int32_array local_domain_to_file = books["local_domain_to_file"].value();
-        int32_array local_domain_status  = books["local_domain_status"].value();
-        // num total files
-        int32_array local_file_batons    = books["local_file_batons"].value();
-        int32_array global_file_batons   = books["global_file_batons"].value();
-
-        Node d2f_map;
-        gen_domain_to_file_map(global_num_domains,
-                               num_files,
-                               books);
-
-        int32_array global_d2f = books["global_domain_to_file"].value();
-
-        // init our local map and status array
-        for(int d = 0; d < local_num_domains; ++d)
-        {
-            const Node &dom = multi_dom.child(d);
-            uint64 domain = dom["state/domain_id"].to_uint64();
-            // local domain index to file map
-            local_domain_to_file[d] = global_d2f[domain];
-            local_domain_status[d] = 1; // pending (1), vs done (0)
-        }
-
-        //
-        // Round and round we go, will we deadlock I believe no :-)
-        //
-        // Here is how this works:
-        //  At each round, if a rank has domains pending to write to a file,
-        //  we put the rank id in the local file_batons vec.
-        //  This vec is then mpi max'ed, and the highest rank
-        //  that needs access to each file will write this round.
-        //
-        //  When a rank does not need to write to a file, we
-        //  put -1 for this rank.
-        //
-        //  During each round, max of # files writers are participating
-        //
-        //  We are done when the mpi max of the batons is -1 for all files.
-        //
-
-        bool another_twirl = true;
-        int twirls = 0;
-        while(another_twirl)
-        {
-            // update baton requests
-            for(int f = 0; f < num_files; ++f)
-            {
-                for(int d = 0; d < local_num_domains; ++d)
-                {
-                    if(local_domain_status[d] == 1)
-                        local_file_batons[f] = par_rank;
-                    else
-                        local_file_batons[f] = -1;
-                }
-            }
-
-            // mpi max file batons array
-            #ifdef ASCENT_MPI_ENABLED
-                mpi::max_all_reduce(books["local_file_batons"],
-                                    books["global_file_batons"],
-                                    mpi_comm);
-            #else
-                global_file_batons.set(local_file_batons);
-            #endif
-
-            // we now have valid batons (global_file_batons)
-            for(int f = 0; f < num_files; ++f)
-            {
-                // check if this rank has the global baton for this file
-                if( global_file_batons[f] == par_rank )
-                {
-                    // check the domains this rank has pending
-                    for(int d = 0; d < local_num_domains; ++d)
-                    {
-                        // reuse this handle for all domains in the file
-                        relay::io::IOHandle hnd;
-                        if(local_domain_status[d] == 1 &&  // pending
-                           local_domain_to_file[d] == f) // destined for this file
-                        {
-                            // now is the time to write!
-                            // pattern is:
-                            //  file_%06llu.{protocol}:/domain_%06llu/...
-                            const Node &dom = multi_dom.child(d);
-                            uint64 domain_id = dom["state/domain_id"].to_uint64();
-                            // construct file name
-                            snprintf(fmt_buff, sizeof(fmt_buff), "%06d",f);
-                            oss.str("");
-                            oss << "file_" << fmt_buff << "." << file_protocol;
-                            std::string file_name = oss.str();
-                            oss.str("");
-                            // and now domain id
-                            snprintf(fmt_buff, sizeof(fmt_buff), "%06llu",domain_id);
-                            oss << "domain_" << fmt_buff;
-
-                            std::string path = oss.str();
-                            string output_file = conduit::utils::join_file_path(output_dir,file_name);
-
-                            if(!hnd.is_open())
-                            {
-                                hnd.open(output_file);
-                            }
-
-                            hnd.write(dom,path);
-                            ASCENT_INFO("rank " << par_rank << " output_file"
-                                      << output_file << " path " << path);
-
-                            // update status, we are done with this doman
-                            local_domain_status[d] = 0;
-                        }
-                    }
-                }
-            }
-
-            // If you  need to debug the baton alog:
-            // std::cout << "[" << par_rank << "] "
-            //              << " twirls: " << twirls
-            //              << " details\n"
-            //              << books.to_yaml();
-
-            // check if we have another round
-            // stop when all batons are -1
-            another_twirl = false;
-            for(int f = 0; f < num_files && !another_twirl; ++f)
-            {
-                // if any entry is not -1, we still have more work to do
-                if(global_file_batons[f] != -1)
-                {
-                    another_twirl = true;
-                    twirls++;
-                }
-            }
-        }
-    }
-
-    int root_file_writer = 0;
-    if(local_num_domains == 0)
-    {
-      root_file_writer = -1;
-    }
-#ifdef ASCENT_MPI_ENABLED
-    // Rank 0 could have an empty domain, so we have to check
-    // to find someone with a data set to write out the root file.
-    Node out;
-    out = local_num_domains;
-    Node rcv;
-
-    mpi::all_gather_using_schema(out, rcv, mpi_comm);
-    root_file_writer = -1;
-    int* res_ptr = (int*)rcv.data_ptr();
-    for(int i = 0; i < par_size; ++i)
-    {
-        if(res_ptr[i] != 0)
-        {
-            root_file_writer = i;
-            break;
-        }
-    }
-
-    MPI_Barrier(mpi_comm);
-#endif
-
-    if(root_file_writer == -1)
-    {
-        // this should not happen. global doms is already 0
-        ASCENT_WARN("Relay: there are no domains to write out");
-    }
-
-    snprintf(fmt_buff, sizeof(fmt_buff), "%06d",cycle);
-
-    oss.str("");
-    oss << path
-        << ".cycle_"
-        << fmt_buff
-        << ".root";
-
-    string root_file = oss.str();
-
-    // return this via out var
-    root_file_out = root_file;
-
-    // --------
-    // create blueprint index
-    // --------
-
-    // all ranks participate in the index gen
-    Node bp_idx;
-#ifdef ASCENT_MPI_ENABLED
-        // mpi tasks may have diff fields, topos, etc
-        //
-        detail::mesh_bp_generate_index(multi_dom,
-                                       "",
-                                       bp_idx["mesh"],
-                                       mpi_comm);
+    MPI_Comm mpi_comm = MPI_Comm_f2c(Workspace::default_mpi_comm());
+    conduit::relay::mpi::io::blueprint::save_mesh(data,
+                                                  path,
+                                                  file_protocol,
+                                                  opts,
+                                                  mpi_comm);
 #else
-        detail::mesh_bp_generate_index(multi_dom,
-                                       "",
-                                       global_num_domains,
-                                       bp_idx["mesh"]);
+    conduit::relay::io::blueprint::save_mesh(data,
+                                             path,
+                                             file_protocol,
+                                             opts);
 #endif
 
-    // let selected rank write out the root file
-    if(par_rank == root_file_writer)
+    if(using_hdf5_opts)
     {
-        string output_dir_base, output_dir_path;
-
-        // TODO: Fix for windows
-        conduit::utils::rsplit_string(output_dir,
-                                      "/",
-                                      output_dir_base,
-                                      output_dir_path);
-
-        string output_tree_pattern;
-        string output_file_pattern;
-
-        if(global_num_domains == num_files)
-        {
-            output_tree_pattern = "/";
-            output_file_pattern = conduit::utils::join_file_path(output_dir_base,
-                                                                 "domain_%06d." + file_protocol);
-        }
-        else
-        {
-            output_tree_pattern = "/domain_%06d";
-            output_file_pattern = conduit::utils::join_file_path(output_dir_base,
-                                                                 "file_%06d." + file_protocol);
-        }
-
-
-        Node root;
-        root["blueprint_index"] = bp_idx;
-
-        // work around conduit and manually add state fields
-        if(multi_dom.child(0).has_path("state/cycle"))
-        {
-          bp_idx["mesh/state/cycle"] = multi_dom.child(0)["state/cycle"].to_int32();
-        }
-
-        if(multi_dom.child(0).has_path("state/time"))
-        {
-          bp_idx["mesh/state/time"] = multi_dom.child(0)["state/time"].to_double();
-        }
-
-        root["protocol/name"]    = file_protocol;
-        root["protocol/version"] = "0.6.0";
-
-        root["number_of_files"]  = num_files;
-        root["number_of_trees"]  = global_num_domains;
-        // TODO: make sure this is relative
-        root["file_pattern"]     = output_file_pattern;
-        root["tree_pattern"]     = output_tree_pattern;
-
-        relay::io::save(root,root_file,file_protocol);
+        // pop hdf5 io settings
+        conduit::relay::io::hdf5_set_options(hdf5_opts_orig);
     }
+    return;
+
 }
 
 
@@ -1070,7 +543,7 @@ RelayIOSave::execute()
     Node *in = n_input.get();
 
     Node selected;
-    conduit::Node test;
+
     if(params().has_path("fields"))
     {
       std::vector field_selection;
@@ -1112,18 +585,32 @@ RelayIOSave::execute()
       const int num_domains = selected.number_of_children();
       for(int i = 0; i < num_domains; ++i)
       {
+        // this could be external data, we don't want
+        // to modify the source so if the entry exists
+        // we remove and reset
         conduit::Node &dom = selected.child(i);
+        if(dom.has_path("state/cycle"))
+        {
+            dom["state/cycle"].reset();
+        }
+
         dom["state/cycle"] = cycle;
       }
     }
 
-
     int num_files = -1;
 
     if(params().has_path("num_files"))
     {
         num_files = params()["num_files"].to_int();
     }
+    
+    Node extra_opts;
+
+    if(params().has_path("hdf5_options"))
+    {
+        extra_opts = params()["hdf5_options"];
+    }
 
     std::string result_path;
     if(protocol.empty())
@@ -1137,6 +624,7 @@ RelayIOSave::execute()
                             path,
                             "hdf5",
                             num_files,
+                            extra_opts,
                             result_path);
     }
     else if( protocol == "blueprint/mesh/json" || protocol == "json")
@@ -1145,6 +633,7 @@ RelayIOSave::execute()
                             path,
                             "json",
                             num_files,
+                            extra_opts,
                             result_path);
 
     }
@@ -1154,6 +643,7 @@ RelayIOSave::execute()
                             path,
                             "yaml",
                             num_files,
+                            extra_opts,
                             result_path);
 
     }
diff --git a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_relay_filters.hpp b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_relay_filters.hpp
index 8a1f6d845..243a05a34 100644
--- a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_relay_filters.hpp
+++ b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_relay_filters.hpp
@@ -47,6 +47,7 @@ void mesh_blueprint_save(const conduit::Node &data,
                          const std::string &path,
                          const std::string &file_protocol,
                          int num_files,
+                         const conduit::Node &extra_opts,
                          std::string &root_file_out);
 
 class ASCENT_API RelayIOSave : public ::flow::Filter
diff --git a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_rendering_filters.cpp b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_rendering_filters.cpp
index 9578cbb83..fad25d8f3 100644
--- a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_rendering_filters.cpp
+++ b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_rendering_filters.cpp
@@ -50,6 +50,7 @@
 #include 
 #include 
 #include 
+#include 
 #include 
 
 #include 
@@ -168,6 +169,13 @@ check_renders_surprises(const conduit::Node &renders_node)
   r_valid_paths.push_back("shading");
   r_valid_paths.push_back("use_original_bounds");
   r_valid_paths.push_back("dataset_bounds");
+  r_valid_paths.push_back("auto_camera/metric");
+  r_valid_paths.push_back("auto_camera/field");
+  r_valid_paths.push_back("auto_camera/samples");
+  r_valid_paths.push_back("auto_camera/bins");
+  r_valid_paths.push_back("auto_camera/height");
+  r_valid_paths.push_back("auto_camera/width");
+  r_valid_paths.push_back("color_bar_position");
 
   std::vector r_ignore_paths;
   r_ignore_paths.push_back("phi_theta_positions");
@@ -479,6 +487,30 @@ vtkh::Render parse_render(const conduit::Node &render_node,
 
   render.ScaleWorldAnnotations(axis_scale_x, axis_scale_y, axis_scale_z);
 
+  if(render_node.has_path("color_bar_position"))
+  {
+    if(!render_node["color_bar_position"].dtype().is_number() ||
+		    render_node["color_bar_position"].dtype().number_of_elements()%4 != 0)
+    {
+      ASCENT_ERROR("render/color_bar_position must be an array of 4 values for each color bar");
+    }
+
+    int positions = render_node["color_bar_position"].dtype().number_of_elements()/4;
+    std::vector cb_position;
+    for(int i = 0; i < positions; i++)
+    {
+      conduit::Node n;
+      render_node["color_bar_position"].to_float32_array(n);
+      const float32 *cb_pos = n.as_float32_ptr();
+      vtkm::Bounds pos(vtkm::Range(cb_pos[0+4*i],cb_pos[1+4*i]), 
+			vtkm::Range(cb_pos[2+4*i],cb_pos[3+4*i]), 
+			vtkm::Range(0.0,0.0));
+      cb_position.push_back(pos);
+    }
+    render.SetColorBarPosition(cb_position);
+
+  }
+
   return render;
 }
 
@@ -1112,6 +1144,7 @@ DefaultRender::execute()
         std::string image_name;
 
         bool is_cinema = false;
+        bool is_auto_camera = false;
 
         if(render_node.has_path("type"))
         {
@@ -1119,6 +1152,10 @@ DefaultRender::execute()
           {
             is_cinema = true;
           }
+          if(render_node["type"].as_string() == "auto_camera")
+          {
+            is_auto_camera = true;
+          }
         }
 
         if(is_cinema)
@@ -1165,7 +1202,6 @@ DefaultRender::execute()
           manager.fill_renders(renders, render_node);
           manager.write_metadata();
         }
-
         else
         {
           // this render has a unique name
@@ -1190,6 +1226,7 @@ DefaultRender::execute()
                          "'image_prefix' parameter");
           }
 
+
 	  if(render_node.has_path("dataset_bounds"))
 	  {
 	    float64_accessor d_bounds = render_node["dataset_bounds"].value();
@@ -1218,10 +1255,77 @@ DefaultRender::execute()
 	      scene_bounds.Z.Max = d_bounds[5];
 	  }
 
-          vtkh::Render render = detail::parse_render(render_node,
-                                                     scene_bounds,
-                                                     image_name);
-          renders->push_back(render);
+	  if(is_auto_camera)
+	  { 
+            DataObject *source
+              = graph().workspace().registry().fetch("source_object");
+            
+            std::shared_ptr collection = source->as_vtkh_collection();
+      
+	    if(!render_node.has_path("auto_camera/field"))
+              ASCENT_ERROR("Auto Camera must specify a 'field'");
+	    if(!render_node.has_path("auto_camera/metric"))
+              ASCENT_ERROR("Auto Camera must specify a 'metric'");
+	    if(!render_node.has_path("auto_camera/samples"))
+              ASCENT_ERROR("Auto Camera must specify number of 'samples'");
+
+            std::string field_name = render_node["auto_camera/field"].as_string();
+            std::string metric     = render_node["auto_camera/metric"].as_string();
+            int samples            = render_node["auto_camera/samples"].as_int32();
+      
+            if(!collection->has_field(field_name))
+            {
+              ASCENT_ERROR("Unknown field '"<field_topology(field_name);
+            vtkh::DataSet &dataset = collection->dataset_by_topology(topo_name);
+      
+            vtkh::AutoCamera auto_cam;
+      
+	    int height = 1024;
+	    int width  = 1024;
+            if(render_node.has_path("auto_camera/bins"))
+            {
+              int bins = render_node["auto_camera/bins"].as_int32();
+              auto_cam.SetNumBins(bins); 
+            }
+            if(render_node.has_path("auto_camera/height"))
+            {
+              height = render_node["auto_camera/height"].as_int32();
+              auto_cam.SetHeight(height); 
+            }
+            if(render_node.has_path("auto_camera/width"))
+            {
+              width = render_node["auto_camera/width"].as_int32();
+              auto_cam.SetWidth(width); 
+            }
+      
+            auto_cam.SetInput(&dataset);
+            auto_cam.SetField(field_name);
+            auto_cam.SetMetric(metric);
+            auto_cam.SetNumSamples(samples);
+            auto_cam.Update();
+            
+            vtkm::rendering::Camera *camera = new vtkm::rendering::Camera;
+            *camera = auto_cam.GetCamera();
+	    vtkh::Render render = vtkh::MakeRender(width,
+                                      height,
+                                      scene_bounds,
+	    			      *camera,
+                                      image_name);
+            renders->push_back(render);
+	    delete camera;
+
+	  }
+	  else
+	  {
+
+            vtkh::Render render = detail::parse_render(render_node,
+                                                       scene_bounds,
+                                                       image_name);
+            renders->push_back(render);
+	  }
         }
       }
     }
diff --git a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_rover_filters.cpp b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_rover_filters.cpp
index 5888c11cd..94f90c42e 100644
--- a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_rover_filters.cpp
+++ b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_rover_filters.cpp
@@ -301,8 +301,14 @@ RoverXRay::execute()
         }
       }
 
+      conduit::Node extra_opts;
       std::string result_path;
-      mesh_blueprint_save(multi_domain, filename, protocol, -1, result_path);
+      mesh_blueprint_save(multi_domain,
+                          filename,
+                          protocol,
+                          -1,
+                          extra_opts,
+                          result_path);
     }
 
     if(params().has_path("image_params"))
diff --git a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_trigger_filters.cpp b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_trigger_filters.cpp
index bc4aa06cd..8f841d2f3 100644
--- a/src/libs/ascent/runtimes/flow_filters/ascent_runtime_trigger_filters.cpp
+++ b/src/libs/ascent/runtimes/flow_filters/ascent_runtime_trigger_filters.cpp
@@ -84,7 +84,7 @@ BasicTrigger::verify_params(const conduit::Node ¶ms,
                             conduit::Node &info)
 {
     info.reset();
-    bool res = check_string("condition",params, info, true);
+    bool res = check_string("condition",params, info, false);
 
     res &= check_string("actions_file",params, info, false);
     if(params.has_path("actions"))
@@ -117,6 +117,7 @@ BasicTrigger::verify_params(const conduit::Node ¶ms,
 
     std::vector valid_paths;
     valid_paths.push_back("condition");
+    valid_paths.push_back("callback");
     valid_paths.push_back("actions_file");
     valid_paths.push_back("actions");
 
@@ -148,8 +149,6 @@ BasicTrigger::execute()
     DataObject *data_object = input(0);
     std::shared_ptr n_input = data_object->as_low_order_bp();
 
-    std::string expression = params()["condition"].as_string();
-
     bool use_actions_file = params().has_path("actions_file");
 
     std::string actions_file = "";
@@ -164,13 +163,31 @@ BasicTrigger::execute()
       actions = params()["actions"];
     }
 
+    conduit::Node res;
+
+    bool has_callback = params().has_path("callback");
+    bool has_condition = params().has_path("condition");
 
-    runtime::expressions::ExpressionEval eval(n_input.get());
-    conduit::Node res = eval.evaluate(expression);
+    if(has_callback)
+    {
+      std::string callback_name = params()["callback"].as_string();
+      res["value"] = ascent::execute_callback(callback_name);
+      res["type"] = "bool";
+    }
+    else if(has_condition)
+    {
+      runtime::expressions::ExpressionEval eval(n_input.get());
+      std::string expression = params()["condition"].as_string();
+      res = eval.evaluate(expression);
 
-    if(res["type"].as_string() != "bool")
+      if(res["type"].as_string() != "bool")
+      {
+        ASCENT_ERROR("result of expression '"<
 #include 
 #include 
+#include 
 #include 
 #include 
 #include 
@@ -3926,7 +3927,6 @@ VTKHStreamline::~VTKHStreamline()
 // empty
 }
 
-
 //-----------------------------------------------------------------------------
 };
 //-----------------------------------------------------------------------------
diff --git a/src/libs/ascent/utils/ascent_actions_utils.cpp b/src/libs/ascent/utils/ascent_actions_utils.cpp
index 296640d06..741d56898 100644
--- a/src/libs/ascent/utils/ascent_actions_utils.cpp
+++ b/src/libs/ascent/utils/ascent_actions_utils.cpp
@@ -188,6 +188,60 @@ void filter_fields(const conduit::Node &node,
       {
         parse_expression(child.as_string(), fields);
       }
+
+      // ---------
+      // special cases for data binning
+      // ---------
+      // OLD STYLE BINNING:
+      // params:
+      //   reduction_op: "sum"
+      //   var: "braid"
+      //   output_field: "binning"
+      //   output_type: "bins"
+      //   axes:
+      //     -
+      //       var: "x"
+      //       num_bins: 10
+      //       min_val: -10.0
+      //       max_val: 10.0
+      //       clamp: 1
+      //     -
+      //       var: "y"
+      //       num_bins: 10
+      //       clamp: 0
+      //     -
+      //       var: "z"
+      //       num_bins: 10
+      //       clamp: 10
+      //
+      // NEW STYLE BINNING:
+      // params:
+      //   reduction_op: "sum"
+      //   reduction_field: "braid"
+      //   output_field: "binning"
+      //   output_type: "bins"
+      //   axes:
+      //     -
+      //       field: "x"
+      //       num_bins: 10
+      //       min_val: -10.0
+      //       max_val: 10.0
+      //       clamp: 1
+      //     -
+      //       field: "y"
+      //       num_bins: 10
+      //       clamp: 0
+      //     -
+      //       field: "z"
+      //       num_bins: 10
+      //       clamp: 10
+      //
+      //  1) data binning: reduction `var` or `reduction_field`
+      if(names[i] == "var" || names[i] == "reduction_field" )
+      {
+        fields.insert(child.as_string());
+      }
+
       // special detection for filters that use
       // all fields by default
       if(names[i] == "type")
@@ -216,7 +270,7 @@ void filter_fields(const conduit::Node &node,
         conduit::Node &error = info.append();
         error["message"] = "Field filtering does not support "
                            "scanning actions files specified "
-                           "by triggers. Please specifiy the "
+                           "by triggers. Please specify the "
                            "trigger actions directly in the "
                            "trigger parameters.";
       } // actions file
@@ -224,6 +278,7 @@ void filter_fields(const conduit::Node &node,
 
     if(!is_leaf)
     {
+      // if we are an object, run on each child
       if(!child.dtype().is_list())
       {
         filter_fields(child, fields, info);
@@ -243,6 +298,11 @@ void filter_fields(const conduit::Node &node,
             }
           } // for list  entries
         } // is  field list
+        else if(names[i] == "axes") // axis list (data binning)
+        {
+          // normal logic applies
+          filter_fields(child, fields, info);
+        }
       } //  list processing
     } // inner node
   } // for children
diff --git a/src/libs/dray/CMakeLists.txt b/src/libs/dray/CMakeLists.txt
index a5fd688f7..601ee5af4 100644
--- a/src/libs/dray/CMakeLists.txt
+++ b/src/libs/dray/CMakeLists.txt
@@ -4,6 +4,20 @@
 
 # adjust cmake options into proper defs for generate dray_config.h
 
+if(ENABLE_OPENMP)
+    set(DRAY_OPENMP_ENABLED TRUE)
+    message(STATUS "DRay OpenMP Support Enabled")
+endif()
+
+if(ENABLE_CUDA)
+    set(DRAY_CUDA_ENABLED TRUE)
+    message(STATUS "DRay CUDA Support Enabled")
+endif()
+
+if(ENABLE_HIP)
+    set(DRAY_HIP_ENABLED TRUE)
+    message(STATUS "DRay HIP Support Enabled")
+endif()
 
 if(MFEM_FOUND)
     set(DRAY_MFEM_ENABLED TRUE)
@@ -20,11 +34,6 @@ if(DRAY_USE_DOUBLE_PRECISION)
     message(STATUS "DRay using double precision")
 endif()
 
-if(ENABLE_OPENMP)
-    set(DRAY_OPENMP_ENABLED TRUE)
-    message(STATUS "DRay OpenMP Support Enabled")
-endif()
-
 if(DRAY_ENABLE_STATS)
     set(DRAY_STATS TRUE)
     message(STATUS "DRay Stats enabled")
diff --git a/src/libs/dray/dray_config.h.in b/src/libs/dray/dray_config.h.in
index 56bc76d9e..8840d8f19 100644
--- a/src/libs/dray/dray_config.h.in
+++ b/src/libs/dray/dray_config.h.in
@@ -7,24 +7,18 @@
 #define DRAY_CONFIG_H
 
 // config time defines
-#cmakedefine DRAY_MFEM_ENABLED
 #cmakedefine DRAY_OPENMP_ENABLED
+#cmakedefine DRAY_CUDA_ENABLED
+#cmakedefine DRAY_HIP_ENABLED
+#cmakedefine DRAY_MFEM_ENABLED
 #cmakedefine DRAY_ENABLE_LOGGING
 #cmakedefine DRAY_USE_DOUBLE_PRECISION
 #cmakedefine DRAY_STATS
 
 #include 
 
-#if defined(__CUDACC__) && !defined(DEBUG_CPU_ONLY)
-
-#define DRAY_CUDA_ENABLED
-#define DRAY_EXEC RAJA_INLINE RAJA_HOST_DEVICE
-#define DRAY_EXEC_ONLY RAJA_INLINE RAJA_DEVICE
-#define DRAY_LAMBDA RAJA_DEVICE
-
-#elif defined(__HIP_PLATFORM_HCC__) && !defined(DEBUG_CPU_ONLY)
+#if defined(DRAY_CUDA_ENABLED) ||defined(DRAY_HIP_ENABLED)
 
-#define DRAY_HIP_ENABLED
 #define DRAY_EXEC RAJA_INLINE RAJA_HOST_DEVICE
 #define DRAY_EXEC_ONLY RAJA_INLINE RAJA_DEVICE
 #define DRAY_LAMBDA RAJA_DEVICE
diff --git a/src/libs/rover/ray_generators/camera_generator.cpp b/src/libs/rover/ray_generators/camera_generator.cpp
index 95def9855..e54468df8 100644
--- a/src/libs/rover/ray_generators/camera_generator.cpp
+++ b/src/libs/rover/ray_generators/camera_generator.cpp
@@ -40,6 +40,9 @@
 //
 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
 #include 
+
+#include 
+
 namespace rover {
 
 CameraGenerator::CameraGenerator()
diff --git a/src/libs/rover/ray_generators/visit_generator.cpp b/src/libs/rover/ray_generators/visit_generator.cpp
index e6e67390e..bda016027 100644
--- a/src/libs/rover/ray_generators/visit_generator.cpp
+++ b/src/libs/rover/ray_generators/visit_generator.cpp
@@ -42,6 +42,8 @@
 #include 
 #include 
 #include 
+#include 
+#include 
 #include 
 #include 
 namespace rover {
@@ -75,7 +77,15 @@ VisitGenerator::gen_rays(vtkmRayTracing::Ray &rays)
 
   const int size = m_width * m_height;
 
-  rays.Resize(size, vtkm::cont::DeviceAdapterTagSerial());
+#if (VTKM_VERSION_MAJOR >= 2) && (VTKM_VERSION_MINOR >= 1)
+    vtkm::rendering::raytracing::RayOperations::Resize(rays,
+                                                       size);
+#else
+    vtkm::rendering::raytracing::RayOperations::Resize(rays,
+                                                       size,
+                                                       vtkm::cont::DeviceAdapterTagSerial());
+#endif
+
 
   vtkm::Vec view_side;
 
diff --git a/src/libs/vtkh/filters/ContourTree.cpp b/src/libs/vtkh/filters/ContourTree.cpp
index 5e95d4c5d..74259912c 100644
--- a/src/libs/vtkh/filters/ContourTree.cpp
+++ b/src/libs/vtkh/filters/ContourTree.cpp
@@ -6,17 +6,117 @@
 #include 
 #include 
 #include 
-#include 
-#include 
-#include 
-#include 
-#include 
+#include 
+#include 
+#include 
+#include 
+
+#include  
+
+#include 
 
 namespace caugmented_ns = vtkm::worklet::contourtree_augmented;
-using DataValueType = vtkm::Float64;
-using ValueArray = vtkm::cont::ArrayHandle;
-using BranchType = vtkm::worklet::contourtree_augmented::process_contourtree_inc::Branch;
-using PLFType = vtkm::worklet::contourtree_augmented::process_contourtree_inc::PiecewiseLinearFunction;
+
+static void ShiftLogicalOriginToZero(vtkm::cont::PartitionedDataSet& pds)
+{
+  // Shift the logical origin (minimum of LocalPointIndexStart) to zero
+  // along each dimension
+
+  // Compute minimum global point index start for all data sets on this MPI rank
+  std::vector minimumGlobalPointIndexStartThisRank;
+  using ds_const_iterator = vtkm::cont::PartitionedDataSet::const_iterator;
+  for (ds_const_iterator ds_it = pds.cbegin(); ds_it != pds.cend(); ++ds_it)
+  {
+    ds_it->GetCellSet().CastAndCallForTypes(
+      [&minimumGlobalPointIndexStartThisRank](const auto& css)
+      {
+        minimumGlobalPointIndexStartThisRank.resize(css.Dimension,
+                                                    std::numeric_limits::max());
+        for (vtkm::IdComponent d = 0; d < css.Dimension; ++d)
+        {
+          minimumGlobalPointIndexStartThisRank[d] =
+            std::min(minimumGlobalPointIndexStartThisRank[d], css.GetGlobalPointIndexStart()[d]);
+        }
+      });
+  }
+
+  // Perform global reduction to find GlobalPointDimensions across all ranks
+  std::vector minimumGlobalPointIndexStart;
+  auto comm = vtkm::cont::EnvironmentTracker::GetCommunicator();
+  vtkmdiy::mpi::all_reduce(comm,
+                           minimumGlobalPointIndexStartThisRank,
+                           minimumGlobalPointIndexStart,
+                           vtkmdiy::mpi::minimum{});
+
+  // Shift all cell sets so that minimum global point index start
+  // along each dimension is zero
+  using ds_iterator = vtkm::cont::PartitionedDataSet::iterator;
+  for (ds_iterator ds_it = pds.begin(); ds_it != pds.end(); ++ds_it)
+  {
+    // This does not work, i.e., it does not really change the cell set for the DataSet
+    ds_it->GetCellSet().CastAndCallForTypes(
+      [&minimumGlobalPointIndexStart, &ds_it](auto& css) {
+        auto pointIndexStart = css.GetGlobalPointIndexStart();
+        typename std::remove_reference_t::SchedulingRangeType shiftedPointIndexStart;
+        for (vtkm::IdComponent d = 0; d < css.Dimension; ++d)
+        {
+          shiftedPointIndexStart[d] = pointIndexStart[d] - minimumGlobalPointIndexStart[d];
+        }
+        css.SetGlobalPointIndexStart(shiftedPointIndexStart);
+        // Why is the following necessary? Shouldn't it be sufficient to update the
+        // CellSet through the reference?
+        ds_it->SetCellSet(css);
+      });
+  }
+}
+
+static void ComputeGlobalPointSize(vtkm::cont::PartitionedDataSet& pds)
+{
+  // Compute GlobalPointDimensions as maximum of GlobalPointIndexStart + PointDimensions
+  // for each dimension across all blocks
+
+  // Compute GlobalPointDimensions for all data sets on this MPI rank
+  std::vector globalPointDimensionsThisRank;
+  using ds_const_iterator = vtkm::cont::PartitionedDataSet::const_iterator;
+  for (ds_const_iterator ds_it = pds.cbegin(); ds_it != pds.cend(); ++ds_it)
+  {
+    ds_it->GetCellSet().CastAndCallForTypes(
+      [&globalPointDimensionsThisRank](const auto& css) {
+        globalPointDimensionsThisRank.resize(css.Dimension, -1);
+        for (vtkm::IdComponent d = 0; d < css.Dimension; ++d)
+        {
+          globalPointDimensionsThisRank[d] =
+            std::max(globalPointDimensionsThisRank[d],
+                     css.GetGlobalPointIndexStart()[d] + css.GetPointDimensions()[d]);
+        }
+      });
+  }
+
+  // Perform global reduction to find GlobalPointDimensions across all ranks
+  std::vector globalPointDimensions;
+  auto comm = vtkm::cont::EnvironmentTracker::GetCommunicator();
+  vtkmdiy::mpi::all_reduce(
+    comm, globalPointDimensionsThisRank, globalPointDimensions, vtkmdiy::mpi::maximum{});
+
+  // Set this information in all cell sets
+  using ds_iterator = vtkm::cont::PartitionedDataSet::iterator;
+  for (ds_iterator ds_it = pds.begin(); ds_it != pds.end(); ++ds_it)
+  {
+    // This does not work, i.e., it does not really change the cell set for the DataSet
+    ds_it->GetCellSet().CastAndCallForTypes(
+      [&globalPointDimensions, &ds_it](auto& css) {
+        typename std::remove_reference_t::SchedulingRangeType gpd;
+        for (vtkm::IdComponent d = 0; d < css.Dimension; ++d)
+        {
+          gpd[d] = globalPointDimensions[d];
+        }
+        css.SetGlobalPointDimensions(gpd);
+        // Why is the following necessary? Shouldn't it be sufficient to update the
+        // CellSet through the reference?
+        ds_it->SetCellSet(css);
+      });
+  }
+}
 
 #ifdef VTKH_PARALLEL
 #include 
@@ -59,23 +159,6 @@ namespace vtkh
     std::cout << "\n---\n";
   };
 
-
-class SplitColumnComparer
-{
-public:
-  SplitColumnComparer(double* range, int splitDim):
-    m_range(range), m_splitDim(splitDim)
-  {
-  }
-  bool operator() (int i,int j)
-  {
-    return m_range[i*6 + 2*m_splitDim] < m_range[j*6 + 2*m_splitDim];
-  }
-private:
-  double* m_range;
-  int m_splitDim;
-};
-
 ContourTree::ContourTree()
   : m_levels(5)
 {
@@ -115,26 +198,191 @@ void ContourTree::PostExecute()
   Filter::PostExecute();
 }
 
+struct AnalyzerFunctor
+{
+  vtkm::filter::scalar_topology::ContourTreeAugmented& filter;
+  vtkh::ContourTree& contourTree;
+  bool dataFieldIsSorted;
+
+  public:
+  AnalyzerFunctor(vtkh::ContourTree& contourTree, vtkm::filter::scalar_topology::ContourTreeAugmented& filter): contourTree(contourTree), filter(filter)  {
+  }
+
+  void SetDataFieldIsSorted(bool dataFieldIsSorted) {
+     this->dataFieldIsSorted = dataFieldIsSorted;
+  }
+
+  void operator()(const vtkm::cont::ArrayHandle &arr) const
+  {
+     contourTree.analysis(filter, dataFieldIsSorted, arr);
+  }
+
+  void operator()(const vtkm::cont::ArrayHandle &arr) const
+  {
+     contourTree.analysis(filter, dataFieldIsSorted, arr);
+  }
+
+  template 
+  void operator()(const T&) const
+  {
+    throw vtkm::cont::ErrorBadValue("AnalyzerFunctor Expected Float32 or Float64!");
+  }
+};
+
+template void ContourTree::analysis(vtkm::filter::scalar_topology::ContourTreeAugmented& filter,  bool dataFieldIsSorted, const vtkm::cont::UnknownArrayHandle& arr)
+{
+  std::vector iso_values;
+
+  DataValueType eps = 0.00001;        // Error away from critical point
+  vtkm::Id numComp = m_levels + 1;    // Number of components the tree should be simplified to
+  vtkm::Id contourType = 0;           // Approach to be used to select contours based on the tree
+  vtkm::Id contourSelectMethod = 0;   // Method to be used to compute the relevant iso values
+  bool usePersistenceSorter = true;
+
+  // Compute the branch decomposition
+  // Compute the volume for each hyperarc and superarc
+  caugmented_ns::IdArrayType superarcIntrinsicWeight;
+  caugmented_ns::IdArrayType superarcDependentWeight;
+  caugmented_ns::IdArrayType supernodeTransferWeight;
+  caugmented_ns::IdArrayType hyperarcDependentWeight;
+
+  caugmented_ns::ProcessContourTree::ComputeVolumeWeightsSerial(
+      filter.GetContourTree(),
+      filter.GetNumIterations(),
+      superarcIntrinsicWeight,  // (output)
+      superarcDependentWeight,  // (output)
+      supernodeTransferWeight,  // (output)
+      hyperarcDependentWeight); // (output)
+
+  // Compute the branch decomposition by volume
+  caugmented_ns::IdArrayType whichBranch;
+  caugmented_ns::IdArrayType branchMinimum;
+  caugmented_ns::IdArrayType branchMaximum;
+  caugmented_ns::IdArrayType branchSaddle;
+  caugmented_ns::IdArrayType branchParent;
+
+#ifdef DEBUG
+  PrintArrayHandle( superarcIntrinsicWeight, "superarcIntrinsicWeight" );
+  PrintArrayHandle( superarcDependentWeight, "superarcDependentWeight" );
+  PrintArrayHandle( supernodeTransferWeight, "superarcDependentWeight" );
+  PrintArrayHandle( hyperarcDependentWeight, "hyperarcDependentWeight" );
+#endif // DEBUG
+
+
+  caugmented_ns::ProcessContourTree::ComputeVolumeBranchDecompositionSerial(
+      filter.GetContourTree(),
+      superarcDependentWeight,
+      superarcIntrinsicWeight,
+      whichBranch,               // (output)
+      branchMinimum,             // (output)
+      branchMaximum,             // (output)
+      branchSaddle,              // (output)
+      branchParent);             // (output)
+
+  // This is from ContourTree.h
+  using IdArrayType = vtkm::cont::ArrayHandle;
+
+  // Create explicit representation of the branch decompostion from the array representation
+  using ValueArray = vtkm::cont::ArrayHandle;
+  ValueArray dataField;
+
+  arr.AsArrayHandle(dataField);
+
+  using BranchType = vtkm::worklet::contourtree_augmented::process_contourtree_inc::Branch;
+
+  BranchType* branchDecompostionRoot = caugmented_ns::ProcessContourTree::ComputeBranchDecomposition(
+      filter.GetContourTree().Superparents,
+      filter.GetContourTree().Supernodes,
+      whichBranch,
+      branchMinimum,
+      branchMaximum,
+      branchSaddle,
+      branchParent,
+      filter.GetSortOrder(),
+      dataField,
+      dataFieldIsSorted
+    );
+
+  // Simplify the contour tree of the branch decompostion
+  branchDecompostionRoot->SimplifyToSize(numComp, usePersistenceSorter);
+  using PLFType = vtkm::worklet::contourtree_augmented::process_contourtree_inc::PiecewiseLinearFunction;
+
+  // Compute the relevant iso-values
+  switch(contourSelectMethod)
+  {
+    default:
+    case 0:
+      {
+        branchDecompostionRoot->GetRelevantValues(contourType, eps, iso_values);
+      }
+      break;
+    case 1:
+      {
+        PLFType plf;
+        branchDecompostionRoot->AccumulateIntervals(contourType, eps, plf);
+        iso_values = plf.nLargest(m_levels);
+      }
+      break;
+  }
+
+  // Print the compute iso values
+  std::sort(iso_values.begin(), iso_values.end());
+
+  // Unique isovalues
+  auto it = std::unique (iso_values.begin(), iso_values.end());
+  iso_values.resize( std::distance(iso_values.begin(), it) );
+
+  for(size_t x = 0; x < iso_values.size(); ++x)
+  {
+      m_iso_values[x] = iso_values[x];
+  }
+
+  if(branchDecompostionRoot)
+  {
+      delete branchDecompostionRoot;
+  }
+}
+
 void ContourTree::DoExecute()
 {
   vtkh::DataSet *old_input = this->m_input;
+  const int before_num_domains = this->m_input->GetNumberOfDomains();
 
   // make sure we have a node-centered field
   bool valid_field = false;
-  bool is_cell_assoc = m_input->GetFieldAssociation(m_field_name, valid_field) ==
-                       vtkm::cont::Field::Association::CELL_SET;
+  bool is_cell_assoc = m_input->GetFieldAssociation(m_field_name, valid_field) == vtkm::cont::Field::Association::Cells;
   bool delete_input = false;
-  if(valid_field && is_cell_assoc)
+  bool do_recenter = true;
+  if(do_recenter && valid_field && is_cell_assoc)
   {
     Recenter recenter;
     recenter.SetInput(m_input);
     recenter.SetField(m_field_name);
-    recenter.SetResultAssoc(vtkm::cont::Field::Association::POINTS);
+    recenter.SetResultAssoc(vtkm::cont::Field::Association::Points);
     recenter.Update();
     m_input = recenter.GetOutput();
     delete_input = true;
   }
 
+  if(m_input->FieldExists("ascent_ghosts"))
+  {
+    vtkh::GhostStripper stripper;
+
+    stripper.SetInput(m_input);
+    stripper.SetField("ascent_ghosts");
+    stripper.SetMinValue(0);
+    stripper.SetMaxValue(0);
+    stripper.Update();
+    vtkh::DataSet* stripped_input = stripper.GetOutput(); 
+
+    if (delete_input) {
+       delete(m_input);
+    }
+
+    m_input = stripped_input;
+    delete_input = true;
+  }
+
   int mpi_rank = 0;
 
   this->m_output = new DataSet();
@@ -161,127 +409,21 @@ void ContourTree::DoExecute()
 
   vtkm::cont::PartitionedDataSet inDataSet;
 
-  vtkm::cont::ArrayHandle localBlockIndices;
-  vtkm::cont::ArrayHandle localBlockOrigins;
-  vtkm::cont::ArrayHandle localBlockSizes;
-  vtkm::Id3 globalSize(0, 0, 0);
-  vtkm::Id3 blocksPerDim(1, 1, 1);
-
-  // Each rank has one or more blocks.
-  // All ranks have the same number of blocks.
-  double range[mpi_size][6];
-  double localRange[6];
-
   vtkm::Id domain_id;
   vtkm::cont::DataSet dom;
 
   this->m_input->GetDomain(0, dom, domain_id);
-  auto domRange = dom.GetCoordinateSystem(0).GetRange();
   inDataSet.AppendPartition(dom);
 
   if( mpi_size != 1 )
   {
-    for(int j = 0; j < 3; ++j)
-    {
-      localRange[2*j] = domRange[j].Min;
-      localRange[2*j + 1] = domRange[j].Max;
-    }
-
-#ifdef DEBUG
     std::ostringstream ostr;
     ostr << "rank: " << mpi_rank
        << " coord system range: " << dom.GetCoordinateSystem(0).GetRange() << std::endl;
     std::cout << ostr.str();
-#endif
-
-    int blocksPerRank = num_domains;
-    MPI_Allgather(localRange, 2*3*blocksPerRank, MPI_DOUBLE,
-                  range, 2*3*blocksPerRank, MPI_DOUBLE, mpi_comm);
-
+  }
 #ifdef DEBUG
-    {
-      std::ostringstream ostr;
-      ostr << "rank: " << mpi_rank << " values: " << std::endl;
-      for(int i = 0; i < mpi_size; ++i)
-      {
-        for(int j = 0; j < 6; ++j)
-          ostr << range[i][j] << " ";
-        ostr << std::endl;
-      }
-
-      ostr << std::endl;
-      std::cout << ostr.str();
-    }
 #endif
-
-    // Compute globalSize
-    for(int i = 0; i < mpi_size; ++i)
-    {
-      for(int j = 0; j < 3; ++j)
-      {
-        if(range[i][2*j+1] > globalSize[j])
-          globalSize[j] = range[i][2*j+1];
-      }
-    }
-    for(int j = 0; j < 3; ++j)
-    {
-      ++globalSize[j];
-    }
-
-    // Compute blocksPerDim
-    double minRange[3] = {range[0][0], range[0][2], range[0][4]};
-    int splitDim = -1;
-
-    for(int i = 1; i < mpi_size; ++i)
-    {
-      for(int j = 0; j < 3; ++j)
-      {
-        if(range[i][2*j] != minRange[j])
-        {
-          blocksPerDim[j] = mpi_size;
-          splitDim = j;
-
-          i = mpi_size;  // Break outside loop too.
-          break;
-        }
-      }
-    }
-
-    // Initalize localBlock variables
-    localBlockIndices.Allocate(blocksPerRank);
-    localBlockOrigins.Allocate(blocksPerRank);
-    localBlockSizes.Allocate(blocksPerRank);
-
-    auto localBlockIndicesPortal = localBlockIndices.WritePortal();
-    auto localBlockOriginsPortal = localBlockOrigins.WritePortal();
-    auto localBlockSizesPortal = localBlockSizes.WritePortal();
-
-    // Compute localBlockIndices
-    int start[mpi_size]; // start of the splitDim column
-    for(int i = 0; i < mpi_size; ++i)
-    {
-      start[i] = i;
-    }
-
-    SplitColumnComparer comp(&range[0][0], splitDim);
-    std::sort(start, start+mpi_size, comp);
-
-    vtkm::Id3 id(0, 0, 0);
-
-    id[splitDim] = start[mpi_rank];
-    localBlockIndicesPortal.Set(0, id);
-
-    // Compute localBlockOrigins
-    id = vtkm::Id3(0, 0, 0);
-    id[splitDim] = range[start[mpi_rank]][2*splitDim];
-    localBlockOriginsPortal.Set(0, id);
-
-    // Compute localBlockSizes
-    id = globalSize;
-    id[splitDim] = range[start[mpi_rank]][2*splitDim + 1] -
-      range[start[mpi_rank]][2*splitDim] + 1;
-    localBlockSizesPortal.Set(0, id);
-  }
 #endif // VTKH_PARALLEL
 
   bool useMarchingCubes = false;
@@ -290,211 +432,45 @@ void ContourTree::DoExecute()
   bool computeRegularStructure = true;
 
   //Convert the mesh of values into contour tree, pairs of vertex ids
-  vtkm::filter::ContourTreeAugmented filter(useMarchingCubes,
-                                            computeRegularStructure);
-
-  std::vector iso_values;
-
-#ifdef VTKH_PARALLEL
-  if(mpi_size != 1)
-  {
-    // blocksPerDim - number of blocks in each dim.
-    // globalSize - extents - full size of the data.
-    // localBlockIndices - the order of the data blocks index.
-    // localBlockOrigins - block origins in extent.
-    // localBlockSize - extents of the data.
-    filter.SetSpatialDecomposition(
-      blocksPerDim, globalSize, localBlockIndices, localBlockOrigins, localBlockSizes);
-  }
-#endif // VTKH_PARALLEL
+  vtkm::filter::scalar_topology::ContourTreeAugmented filter(useMarchingCubes, computeRegularStructure);
 
   filter.SetActiveField(m_field_name);
 
-#ifdef DEBUG
-    std::cout << "--- inDataSet \n";
-    inDataSet.PrintSummary( std::cout );
-    std::cout << "--- end inDataSet \n";
-
 #ifdef VTKH_PARALLEL
-    ValueArray dataField;
-    inDataSet.GetPartitions()[0].GetField(0).GetData().CopyTo(dataField);
-    PrintArrayHandle( dataField, "dataField" );
+    ShiftLogicalOriginToZero(inDataSet);
+    ComputeGlobalPointSize(inDataSet);
 #endif // VTKH_PARALLEL
-#endif // DEBUG
 
-    auto result = filter.Execute(inDataSet);
-
-#ifdef DEBUG
-    std::cout << "--- result \n";
-    result.PrintSummary( std::cout );
-    std::cout << "--- end result \n";
-
-    {
-    ValueArray dataField;
-#ifdef VTKH_PARALLEL
-    std::cout << "--- field name: " << m_field_name << std::endl;
-    if( result.GetPartitions()[0].GetNumberOfFields() > 1 )
-      result.GetPartitions()[0].GetField("values").GetData().CopyTo(dataField);
-    else
-      result.GetPartitions()[0].GetField(0).GetData().CopyTo(dataField);
-#endif // VTKH_PARALLEL
-    PrintArrayHandle( dataField, "result dataField" );
-    }
-#endif // DEBUG
+  auto result = filter.Execute(inDataSet);
 
   m_iso_values.resize(m_levels);
-  if(mpi_rank == 0)
-  {
-    DataValueType eps = 0.00001;        // Error away from critical point
-    vtkm::Id numComp = m_levels + 1;    // Number of components the tree should be simplified to
-    vtkm::Id contourType = 0;           // Approach to be used to select contours based on the tree
-    vtkm::Id contourSelectMethod = 0;   // Method to be used to compute the relevant iso values
-    bool usePersistenceSorter = true;
-
-    // Compute the branch decomposition
-    // Compute the volume for each hyperarc and superarc
-    caugmented_ns::IdArrayType superarcIntrinsicWeight;
-    caugmented_ns::IdArrayType superarcDependentWeight;
-    caugmented_ns::IdArrayType supernodeTransferWeight;
-    caugmented_ns::IdArrayType hyperarcDependentWeight;
-
-    caugmented_ns::ProcessContourTree::ComputeVolumeWeightsSerial(
-      filter.GetContourTree(),
-      filter.GetNumIterations(),
-      superarcIntrinsicWeight,  // (output)
-      superarcDependentWeight,  // (output)
-      supernodeTransferWeight,  // (output)
-      hyperarcDependentWeight); // (output)
 
-#ifdef DEBUG
-    PrintArrayHandle( superarcIntrinsicWeight, "superarcIntrinsicWeight" );
-    PrintArrayHandle( superarcDependentWeight, "superarcDependentWeight" );
-    PrintArrayHandle( supernodeTransferWeight, "superarcDependentWeight" );
-    PrintArrayHandle( hyperarcDependentWeight, "hyperarcDependentWeight" );
-#endif // DEBUG
+  if (mpi_rank == 0) {
+    AnalyzerFunctor analyzerFunctor(*this, filter);
 
-    // Compute the branch decomposition by volume
-    caugmented_ns::IdArrayType whichBranch;
-    caugmented_ns::IdArrayType branchMinimum;
-    caugmented_ns::IdArrayType branchMaximum;
-    caugmented_ns::IdArrayType branchSaddle;
-    caugmented_ns::IdArrayType branchParent;
-
-    caugmented_ns::ProcessContourTree::ComputeVolumeBranchDecompositionSerial(
-      filter.GetContourTree(),
-      superarcDependentWeight,
-      superarcIntrinsicWeight,
-      whichBranch,               // (output)
-      branchMinimum,             // (output)
-      branchMaximum,             // (output)
-      branchSaddle,              // (output)
-      branchParent);             // (output)
-
-#ifdef DEBUG
-    PrintArrayHandle( whichBranch,   "whichBranch" );
-    PrintArrayHandle( branchMinimum, "branchMinimum" );
-    PrintArrayHandle( branchMaximum, "branchMaximum" );
-    PrintArrayHandle( branchSaddle,  "branchSaddle" );
-    PrintArrayHandle( branchParent,  "branchParent" );
-#endif // DEBUG
-
-    // This is from ContourTree.h
-    using IdArrayType = vtkm::cont::ArrayHandle;
-
-    // Create explicit representation of the branch decompostion from the array representation
 #ifndef VTKH_PARALLEL
-    ValueArray dataField;
-    inDataSet.GetField(0).GetData().CopyTo(dataField);
-
-    bool dataFieldIsSorted = false;
-#else // VTKH_PARALLEL
-    ValueArray dataField;
-    bool dataFieldIsSorted;
-
-    // Why do this? Because right now aa is an int array and we want a double array.
+    analyzerFunctor.SetDataFieldIsSorted(false);
+    vtkm::cont::CastAndCall(inDataSet.GetField(m_field_name).GetData(), analyzerFunctor);
+#else
     if(mpi_size == 1)
     {
-      inDataSet.GetPartition(0).GetField(0).GetData().CopyTo(dataField);
-      dataFieldIsSorted = false;
-    }else{
-      if( result.GetPartitions()[0].GetNumberOfFields() > 1 )
-        result.GetPartitions()[0].GetField("values").GetData().CopyTo(dataField);
-      else
-        result.GetPartitions()[0].GetField(0).GetData().CopyTo(dataField);
-      dataFieldIsSorted = true;
+      analyzerFunctor.SetDataFieldIsSorted(false);
+      vtkm::cont::CastAndCall(inDataSet.GetPartitions()[0].GetField(m_field_name).GetData(), analyzerFunctor);
+    } else {
+      analyzerFunctor.SetDataFieldIsSorted(true);
+
+      /*
+      if( result.GetPartitions()[0].GetNumberOfFields() > 1 ) {
+        vtkm::cont::CastAndCall(result.GetPartitions()[0].GetField("values").GetData(), analyzerFunctor);
+      } else {
+        vtkm::cont::CastAndCall(result.GetPartitions()[0].GetField(0).GetData(), analyzerFunctor);
+      }*/
+
+      // TODO TO BE REVISITED. Tested with: srun -n 8 ./t_vtk-h_contour_tree_par 
+      vtkm::cont::CastAndCall(result.GetPartitions()[0].GetField("resultData").GetData(), analyzerFunctor);
     }
 #endif // VTKH_PARALLEL
-#ifdef DEBUG
-    //resultDataset.PrintSummary( std::cerr );
-    //PrintArrayHandle( (IdArrayType)aa );
-    PrintArrayHandle( dataField, "dataField" );
-#endif // DEBUG
-
-    BranchType* branchDecompostionRoot = caugmented_ns::ProcessContourTree::ComputeBranchDecomposition(
-      filter.GetContourTree().Superparents,
-      filter.GetContourTree().Supernodes,
-      whichBranch,
-      branchMinimum,
-      branchMaximum,
-      branchSaddle,
-      branchParent,
-      filter.GetSortOrder(),
-      dataField,
-      dataFieldIsSorted
-    );
-
-    // Simplify the contour tree of the branch decompostion
-    branchDecompostionRoot->SimplifyToSize(numComp, usePersistenceSorter);
-
-    // Compute the relevant iso-values
-    switch(contourSelectMethod)
-    {
-    default:
-    case 0:
-      {
-        branchDecompostionRoot->GetRelevantValues(contourType, eps, iso_values);
-      }
-      break;
-    case 1:
-      {
-        PLFType plf;
-        branchDecompostionRoot->AccumulateIntervals(contourType, eps, plf);
-        iso_values = plf.nLargest(m_levels);
-      }
-      break;
-    }
-
-    // Print the compute iso values
-    std::sort(iso_values.begin(), iso_values.end());
-
-#ifdef DEBUG
-    std::cout << "Isovalues: ";
-    for(DataValueType val : iso_values) std::cout << val << " ";
-    std::cout << std::endl;
-#endif
-
-    // Unique isovalues
-    std::vector::iterator it = std::unique (iso_values.begin(), iso_values.end());
-    iso_values.resize( std::distance(iso_values.begin(), it) );
-
-#ifdef DEBUG
-    std::cout << iso_values.size() << "  Unique Isovalues: ";
-    for(DataValueType val : iso_values) std::cout << val << " ";
-    std::cout << std::endl;
-
-    std::cout<<"Acrs : " << filter.GetContourTree().Arcs.GetNumberOfValues() <
 #include 
 #include 
+#include 
 
 namespace vtkh
 {
@@ -17,11 +18,16 @@ class ContourTree : public Filter
   void SetField(const std::string &field_name);
   void SetNumLevels(int levels);
   std::vector GetIsoValues();
+
 protected:
   void PreExecute() override;
   void PostExecute() override;
   void DoExecute() override;
 
+private:
+  friend class AnalyzerFunctor;
+  template void analysis(vtkm::filter::scalar_topology::ContourTreeAugmented& filter, bool dataFieldIsSorted, const vtkm::cont::UnknownArrayHandle&  arr);
+
   std::string m_field_name;
   int m_levels;
   std::vector m_iso_values;
diff --git a/src/libs/vtkh/filters/GhostStripper.cpp b/src/libs/vtkh/filters/GhostStripper.cpp
index 736620ce3..743180e80 100644
--- a/src/libs/vtkh/filters/GhostStripper.cpp
+++ b/src/libs/vtkh/filters/GhostStripper.cpp
@@ -2,11 +2,12 @@
 #include 
 #include 
 #include 
-#include 
 #include 
 #include 
 #include 
 
+#include 
+#include 
 #include 
 #include 
 
@@ -15,6 +16,337 @@
 namespace vtkh
 {
 
+namespace detail
+{
+// only do reductions for positive numbers
+struct MinMaxIgnore
+{
+  VTKM_EXEC_CONT
+  vtkm::Vec operator()(const vtkm::Id& a) const
+  {
+    return vtkm::make_Vec(a, a);
+  }
+
+  VTKM_EXEC_CONT
+  vtkm::Vec operator()(const vtkm::Vec& a,
+                                    const vtkm::Vec& b) const
+  {
+    vtkm::Vec min_max;
+    if(a[0] >= 0 && b[0] >=0)
+    {
+      min_max[0] = vtkm::Min(a[0], b[0]);
+    }
+    else if(a[0] < 0)
+    {
+      min_max[0] = b[0];
+    }
+    else
+    {
+      min_max[0] = a[0];
+    }
+
+    if(a[1] >= 0 && b[1] >=0)
+    {
+      min_max[1] = vtkm::Max(a[1], b[1]);
+    }
+    else if(a[1] < 0)
+    {
+      min_max[1] = b[1];
+    }
+    else
+    {
+      min_max[1] = a[1];
+    }
+    return min_max;
+  }
+
+};
+
+template
+VTKM_EXEC_CONT
+vtkm::Vec get_logical(const vtkm::Id &index, const vtkm::Vec &cell_dims);
+
+template<>
+VTKM_EXEC_CONT
+vtkm::Vec get_logical<3>(const vtkm::Id &index, const vtkm::Vec &cell_dims)
+{
+  vtkm::Vec res(0,0,0);
+  res[0] = index % cell_dims[0];
+  res[1] = (index / (cell_dims[0])) % (cell_dims[1]);
+  res[2] = index / ((cell_dims[0]) * (cell_dims[1]));
+  return res;
+}
+
+template<>
+VTKM_EXEC_CONT
+vtkm::Vec get_logical<2>(const vtkm::Id &index, const vtkm::Vec &cell_dims)
+{
+  vtkm::Vec res(0,0,0);
+  res[0] = index % cell_dims[0];
+  res[1] = index / cell_dims[0];
+  return res;
+}
+
+template<>
+VTKM_EXEC_CONT
+vtkm::Vec get_logical<1>(const vtkm::Id &index, const vtkm::Vec &cell_dims)
+{
+  vtkm::Vec res(0,0,0);
+  res[0] = index;
+  return res;
+}
+
+template
+class GhostIndex : public vtkm::worklet::WorkletMapField
+{
+protected:
+  vtkm::Vec m_cell_dims;
+  vtkm::Int32 m_min_value;
+  vtkm::Int32 m_max_value;
+  vtkm::Id m_default_value;
+  vtkm::Int32 m_dim;
+public:
+  VTKM_CONT
+  GhostIndex(vtkm::Vec cell_dims,
+             vtkm::Int32 min_value,
+             vtkm::Int32 max_value,
+             vtkm::Id default_value,
+             vtkm::Id dim)
+    : m_cell_dims(cell_dims),
+      m_min_value(min_value),
+      m_max_value(max_value),
+      m_default_value(default_value),
+      m_dim(dim)
+  {
+  }
+
+  typedef void ControlSignature(FieldIn, FieldOut);
+  typedef void ExecutionSignature(_1, WorkIndex, _2);
+
+  template
+  VTKM_EXEC
+  void operator()(const T &value, const vtkm::Id &index, vtkm::Id &ghost_index) const
+  {
+
+    // we are finding the logical min max of valid zones
+    if( value < m_min_value || value > m_max_value)
+    {
+      ghost_index = m_default_value;
+    }
+    else
+    {
+      vtkm::Vec logical = get_logical(index, m_cell_dims);
+      ghost_index = logical[m_dim];
+    }
+  }
+}; //class GhostIndex
+
+template
+class CanStructuredStrip : public vtkm::worklet::WorkletMapField
+{
+protected:
+  vtkm::Vec m_cell_dims;
+  vtkm::Int32 m_min_value;
+  vtkm::Int32 m_max_value;
+  vtkm::Vec m_valid_min;
+  vtkm::Vec m_valid_max;
+public:
+  VTKM_CONT
+  CanStructuredStrip(vtkm::Vec cell_dims,
+           vtkm::Int32 min_value,
+           vtkm::Int32 max_value,
+           vtkm::Vec valid_min,
+           vtkm::Vec valid_max)
+    : m_cell_dims(cell_dims),
+      m_min_value(min_value),
+      m_max_value(max_value),
+      m_valid_min(valid_min),
+      m_valid_max(valid_max)
+  {
+  }
+
+  typedef void ControlSignature(FieldIn, FieldOut);
+  typedef void ExecutionSignature(_1, WorkIndex, _2);
+
+  template
+  VTKM_EXEC
+  void operator()(const T &value, const vtkm::Id &index, vtkm::UInt8 &can_do) const
+  {
+    can_do = 0; // this is a valid zone
+    // we are validating if non-valid cells fall completely outside
+    // the min max range of valid cells
+    if(value >= m_min_value && value <= m_max_value) return;
+
+    vtkm::Vec logical = get_logical(index, m_cell_dims);
+    bool inside = true;
+    for(vtkm::Int32 i = 0; i < DIMS; ++i)
+    {
+      if(logical[i] < m_valid_min[i] || logical[i] > m_valid_max[i])
+      {
+        inside = false;
+      }
+    }
+    // this is a 'ghost' zone that is inside the valid range
+    // so we cannot structured strip
+    if(inside)
+    {
+      can_do = 1;
+    }
+
+  }
+}; //class CanStructuredStrip
+
+template
+bool CanStrip(vtkm::cont::Field  &ghost_field,
+              const vtkm::Int32 min_value,
+              const vtkm::Int32 max_value,
+              vtkm::Vec &min,
+              vtkm::Vec &max,
+              vtkm::Vec cell_dims,
+              vtkm::Id size,
+              bool &should_strip)
+{
+
+  VTKH_DATA_OPEN("can_strip");
+  vtkm::cont::ArrayHandle dim_indices;
+
+  vtkm::Vec valid_min = {0,0,0};
+  vtkm::Vec valid_max = {0,0,0};
+
+  for(vtkm::Int32 i = 0; i < DIMS; ++i)
+  {
+    vtkm::worklet::DispatcherMapField>(
+        GhostIndex(cell_dims,
+                      min_value,
+                      max_value,
+                      -1,
+                      i))
+       .Invoke(ghost_field.GetData().ResetTypes(vtkm::TypeListScalarAll(),
+                                                VTKM_DEFAULT_STORAGE_LIST{}),
+           dim_indices);
+
+    vtkm::Vec d = {-1, -1};
+    auto mm = vtkm::cont::Algorithm::Reduce(dim_indices,
+                                            d,
+                                            detail::MinMaxIgnore());
+
+    valid_min[i] = mm[0];
+    valid_max[i] = mm[1];
+  }
+
+  vtkm::cont::ArrayHandle valid_flags;
+  valid_flags.Allocate(size);
+
+  min = valid_min;
+  max = valid_max;
+
+  vtkm::worklet::DispatcherMapField>
+    (CanStructuredStrip(cell_dims,
+                              min_value,
+                              max_value,
+                              valid_min,
+                              valid_max))
+     .Invoke(ghost_field.GetData().ResetTypes(vtkm::TypeListScalarAll(),
+                                              VTKM_DEFAULT_STORAGE_LIST{}),
+         valid_flags);
+
+  vtkm::Vec baseline = {-1, -1};
+  auto resMinMax = vtkm::cont::Algorithm::Reduce(valid_flags,
+                                                 baseline,
+                                                 detail::MinMaxIgnore());
+
+  VTKH_DATA_CLOSE();
+
+  vtkm::UInt8 res = resMinMax[1];
+  bool can_strip = res == 0;
+  if(can_strip)
+  {
+    should_strip = false;
+    for(int i = 0; i < DIMS; ++i)
+    {
+      if(cell_dims[i] != (valid_max[i] - valid_min[i] + 1))
+      {
+        should_strip = true;
+      }
+    }
+  }
+  else
+  {
+    should_strip = true;
+  }
+
+  return can_strip;
+}
+
+bool StructuredStrip(vtkm::cont::DataSet &dataset,
+                     vtkm::cont::Field   &ghost_field,
+                     const vtkm::Int32 min_value,
+                     const vtkm::Int32 max_value,
+                     vtkm::Vec &min,
+                     vtkm::Vec &max,
+                     bool &should_strip)
+{
+  VTKH_DATA_OPEN("structured_strip");
+  vtkm::cont::UnknownCellSet cell_set = dataset.GetCellSet();
+  int dims[3];
+  VTKMDataSetInfo::GetPointDims(cell_set, dims);
+  vtkm::Vec cell_dims(0,0,0);
+
+
+  bool can_strip = false;
+  vtkm::Id size = 0;
+  should_strip = false;
+  if(cell_set.IsType>())
+  {
+    cell_dims[0] = dims[0] - 1;
+    size = cell_dims[0];
+
+    can_strip = CanStrip<1>(ghost_field,
+                            min_value,
+                            max_value,
+                            min,
+                            max,
+                            cell_dims,
+                            size,
+                            should_strip);
+  }
+  else if(cell_set.IsType>())
+  {
+    cell_dims[0] = dims[0] - 1;
+    cell_dims[1] = dims[1] - 1;
+    size = cell_dims[0] * cell_dims[1];
+
+    can_strip = CanStrip<2>(ghost_field,
+                            min_value,
+                            max_value,
+                            min,
+                            max,
+                            cell_dims,
+                            size,
+                            should_strip);
+  }
+  else if(cell_set.IsType>())
+  {
+    cell_dims[0] = dims[0] - 1;
+    cell_dims[1] = dims[1] - 1;
+    cell_dims[2] = dims[2] - 1;
+    size = cell_dims[0] * cell_dims[1] * cell_dims[2];
+
+    can_strip = CanStrip<3>(ghost_field,
+                            min_value,
+                            max_value,
+                            min,
+                            max,
+                            cell_dims,
+                            size,
+                            should_strip);
+  }
+
+  VTKH_DATA_CLOSE();
+  return can_strip;
+}
+
+} // namespace detail
 
 GhostStripper::GhostStripper()
   : m_min_value(0),  // default to real zones only
@@ -83,21 +415,68 @@ void GhostStripper::DoExecute()
     vtkm::Range ghost_range = field.GetRange().ReadPortal().Get(0);
 
     if(ghost_range.Min >= m_min_value &&
-    ghost_range.Max <= m_max_value)
+       ghost_range.Max <= m_max_value)
     {
       // nothing to do here
       m_output->AddDomain(dom, domain_id);
       continue;
     }
-    if(!dom.HasField(m_field_name))
+
+    int topo_dims = 0;
+    bool do_threshold = true;
+
+    if(VTKMDataSetInfo::IsStructured(dom, topo_dims))
     {
-      m_output->AddDomain(dom,domain_id);
+      vtkm::Vec min, max;
+      bool should_strip; // just because we can doesn't mean we should
+      bool can_strip = detail::StructuredStrip(dom,
+                                              field,
+                                              m_min_value,
+                                              m_max_value,
+                                              min,
+                                              max,
+                                              should_strip);
+      if(can_strip)
+      {
+        do_threshold = false;
+        if(should_strip)
+        {
+          VTKH_DATA_OPEN("extract_structured");
+          //vtkm::RangeId3 range(min[0],max[0]+1, min[1], max[1]+1, min[2], max[2]+1);
+          vtkm::RangeId3 range(min[0],max[0]+2, min[1], max[1]+2, min[2], max[2]+2);
+          vtkm::Id3 sample(1, 1, 1);
+
+          vtkh::vtkmExtractStructured extract;
+          auto output = extract.Run(dom,
+                                    range,
+                                    sample,
+                                    this->GetFieldSelection());
+
+          m_output->AddDomain(output, domain_id);
+          VTKH_DATA_CLOSE();
+        }
+        else
+        {
+          // All zones are valid so just pass through
+          m_output->AddDomain(dom, domain_id);
+        }
+      }
+
     }
-    else
+
+    if(do_threshold)
     {
-      vtkh::vtkmGhostStripper stripper;
-      vtkm::cont::DataSet stripper_out = stripper.Run(dom, m_field_name);
-      m_output->AddDomain(stripper_out,domain_id);
+      vtkmThreshold thresholder;
+
+      auto tout = thresholder.Run(dom,
+                                  m_field_name,
+                                  m_min_value,
+                                  m_max_value,
+                                  this->GetFieldSelection());
+
+      vtkh::vtkmCleanGrid cleaner;
+      auto clout = cleaner.Run(tout, this->GetFieldSelection());
+      m_output->AddDomain(clout, domain_id);
     }
 
   }
diff --git a/src/libs/vtkh/rendering/Annotator.cpp b/src/libs/vtkh/rendering/Annotator.cpp
index 3c118e533..570c80949 100644
--- a/src/libs/vtkh/rendering/Annotator.cpp
+++ b/src/libs/vtkh/rendering/Annotator.cpp
@@ -51,6 +51,30 @@ Annotator::RenderScreenAnnotations(const std::vector &field_names,
   m_canvas.EndTextRenderingBatch();
 }
 
+void
+Annotator::RenderScreenAnnotations(const std::vector &field_names,
+                                    const std::vector &ranges,
+                                    const std::vector &color_tables,
+				    const std::vector &color_bar_pos)
+	                         
+{
+  m_canvas.SetViewToScreenSpace(m_camera, true);
+  //a user can put as many color bars as they want anywhere they want
+  int num_bars = std::min(int(field_names.size()),int(color_bar_pos.size()));
+  m_canvas.BeginTextRenderingBatch();
+  m_world_annotator->BeginLineRenderingBatch();
+  for(int i = 0; i < num_bars; ++i)
+  {
+    this->m_color_bar_annotation.SetRange(ranges[i], 5);
+    this->m_color_bar_annotation.SetFieldName(field_names[i]);
+    this->m_color_bar_annotation.SetPosition(color_bar_pos[i]);
+    this->m_color_bar_annotation.SetColorTable(color_tables[i]);
+    this->m_color_bar_annotation.Render(m_camera, *m_world_annotator, m_canvas);
+  }
+  m_world_annotator->EndLineRenderingBatch();
+  m_canvas.EndTextRenderingBatch();
+}
+
 void Annotator::RenderWorldAnnotations(vtkm::Vec axis_scale)
 {
   if(!m_is_3d) return;
diff --git a/src/libs/vtkh/rendering/Annotator.hpp b/src/libs/vtkh/rendering/Annotator.hpp
index 39b415314..24d1573b7 100644
--- a/src/libs/vtkh/rendering/Annotator.hpp
+++ b/src/libs/vtkh/rendering/Annotator.hpp
@@ -26,6 +26,10 @@ class VTKH_API Annotator
                                const std::vector &ranges,
                                const std::vector &color_tables);
 
+  void RenderScreenAnnotations(const std::vector &field_names,
+                               const std::vector &ranges,
+                               const std::vector &color_tables,
+			       const std::vector &color_bar_position);
 protected:
   Annotator();
   bool                                    m_is_3d;
diff --git a/src/libs/vtkh/rendering/AutoCamera.cpp b/src/libs/vtkh/rendering/AutoCamera.cpp
new file mode 100644
index 000000000..95636e559
--- /dev/null
+++ b/src/libs/vtkh/rendering/AutoCamera.cpp
@@ -0,0 +1,822 @@
+#include 
+#include "vtkh/rendering/ScalarRenderer.hpp"
+#include 
+
+#include 
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+#include 
+#include 
+#include 
+#include 
+#include 
+//take out
+#include 
+
+#ifdef VTKH_PARALLEL
+#include 
+#endif
+
+namespace vtkh
+{
+
+namespace detail
+{
+
+template 
+void fibonacci_sphere(int i, int samples, T* points)
+{
+  int rnd = 1;
+  //if randomize:
+  //    rnd = random.random() * samples
+
+  T offset = 2./samples;
+  T increment = M_PI * (3. - sqrt(5.));
+
+  T y = ((i * offset) - 1) + (offset / 2);
+  T r = sqrt(1 - pow(y,2));
+
+  T phi = ((i + rnd) % samples) * increment;
+
+  T x = cos(phi) * r;
+  T z = sin(phi) * r;
+
+  points[0] = x;
+  points[1] = y;
+  points[2] = z;
+}
+
+void
+GetCamera(int frame, int nframes, double diameter, float *lookat, double *cam_pos)
+{
+  double points[3];
+  fibonacci_sphere(frame, nframes, points);
+
+  cam_pos[0] = (diameter*points[0]) + lookat[0];
+  cam_pos[1] = (diameter*points[1]) + lookat[1];
+  cam_pos[2] = (diameter*points[2]) + lookat[2];
+
+  //std::cerr << "zoom: " << zoom << std::endl;
+  //std::cerr << "diameter: " << diameter << std::endl;
+  //std::cerr << "lookat: " << lookat[0] << " " << lookat[1] << " " << lookat[2] << std::endl;
+  //std::cerr << "points: " << points[0] << " " << points[1] << " " << points[2] << std::endl;
+  //std::cerr << "camera position: " << cam_pos[0] << " " << cam_pos[1] << " " << cam_pos[2] << std::endl;
+}
+
+struct print_f
+{
+  template
+  void operator()(const vtkm::cont::ArrayHandle &a) const
+  {
+    vtkm::Id s = a.GetNumberOfValues();
+    auto p = a.ReadPortal();
+    for(int i = 0; i < s; ++i)
+    {
+      std::cout<
+std::vector
+GetScalarData(vtkh::DataSet &vtkhData, const char *field_name)
+{
+  //Get domain Ids on this rank
+  //will be nonzero even if there is no data
+  std::vector localDomainIds = vtkhData.GetDomainIds();
+  std::vector data;
+     
+  //if there is data: loop through domains and grab all triangles.
+  if(!vtkhData.IsEmpty())
+  {
+    for(int i = 0; i < localDomainIds.size(); i++)
+    {
+      vtkm::cont::DataSet dataset = vtkhData.GetDomainById(localDomainIds[i]);
+      vtkm::cont::CoordinateSystem coords = dataset.GetCoordinateSystem();
+      vtkm::cont::UnknownCellSet cellset = dataset.GetCellSet();
+      //Get variable
+      vtkm::cont::Field field = dataset.GetField(field_name);
+      
+      long int size = field.GetNumberOfValues();
+      
+      using data_d = vtkm::cont::ArrayHandle;
+      using data_f = vtkm::cont::ArrayHandle;
+      if(field.GetData().IsType())
+      {
+        vtkm::cont::ArrayHandle field_data;
+        field.GetData().AsArrayHandle(field_data);
+        auto portal = field_data.ReadPortal();
+
+        for(int i = 0; i < size; i++)
+        {
+          data.push_back(portal.Get(i));
+        }
+      }
+      if(field.GetData().IsType())
+      {
+        vtkm::cont::ArrayHandle field_data;
+        field.GetData().AsArrayHandle(field_data);
+        auto portal = field_data.ReadPortal();
+
+        for(int i = 0; i < size; i++)
+        {
+          data.push_back(portal.Get(i));
+        }
+      }
+    }
+  }
+  //else
+    //cerr << "VTKH Data is empty" << endl;
+  return data;
+}
+
+template 
+struct CalculateEntropy
+{
+  inline VTKM_EXEC_CONT T operator()(const T& numerator, const T& denominator) const
+  {
+    const T prob = numerator / denominator;
+    if (prob == T(0))
+    {
+      return T(0);
+    }
+    return prob * vtkm::Log(prob);
+  }
+};
+
+template 
+T calcEntropyMM(const vtkm::cont::ArrayHandle& data, int nBins, T min, T max)
+{
+  vtkm::worklet::FieldHistogram worklet;
+  vtkm::cont::ArrayHandle hist;
+  T stepSize;
+  worklet.Run(data, nBins, min, max, stepSize, hist);
+
+  auto len = vtkm::cont::make_ArrayHandleConstant(
+    static_cast(data.GetNumberOfValues()), 
+    hist.GetNumberOfValues());
+  vtkm::cont::ArrayHandle subEntropies;
+  vtkm::cont::Algorithm::Transform(hist, len, subEntropies, CalculateEntropy{});
+
+  T entropy = vtkm::cont::Algorithm::Reduce(subEntropies, T(0));
+
+  return (entropy * -1.0);
+}
+
+template< typename T >
+T calcEntropyMM( const std::vector array, long len, int nBins , T field_min, T field_max)
+{
+  T min = field_min;
+  T max = field_max;
+
+  T stepSize = (max-min) / (T)nBins;
+  if(stepSize == 0)
+    return 0.0;
+
+  long* hist = new long[ nBins ];
+  for(int i = 0; i < nBins; i++ )
+    hist[i] = 0;
+
+  for(long i = 0; i < len; i++ )
+  {
+    T idx = (std::abs(array[i]) - min) / stepSize;
+    if((int)idx == nBins )
+      idx -= 1.0;
+    hist[(int)idx]++;
+  }
+
+  T entropy = 0.0;
+  for(int i = 0; i < nBins; i++ )
+  {
+    T prob = (T)hist[i] / (T)len;
+    if(prob != 0.0 )
+      entropy += prob * std::log( prob );
+  }
+
+  delete[] hist;
+
+  return (entropy * -1.0);
+}
+
+template 
+class CopyWithOffset : public vtkm::worklet::WorkletMapField
+{
+public:
+  using ControlSignature = void(FieldIn src, WholeArrayInOut dest);
+  using ExecutionSignature = void(InputIndex, _1, _2);
+
+  VTKM_CONT
+  CopyWithOffset(const vtkm::Id offset = 0)
+      : Offset(offset)
+  {
+  }
+  template 
+  VTKM_EXEC inline void operator()(const vtkm::Id idx, const FloatType &srcValue, OutArrayType &destArray) const
+  {
+    destArray.Set(idx + this->Offset, srcValue);
+  }
+
+private:
+  vtkm::Id Offset;
+};
+
+template 
+void copyArrayWithOffset(const vtkm::cont::ArrayHandle &src, vtkm::cont::ArrayHandle &dest, vtkm::Id offset)
+{
+  vtkm::cont::Invoker invoker;
+  invoker(CopyWithOffset(offset), src, dest);
+}
+
+template 
+struct MaxValueWithChecks
+{
+  MaxValueWithChecks(T minValid, T maxValid)
+      : MinValid(minValid),
+        MaxValid(maxValid)
+  {
+  }
+
+  VTKM_EXEC_CONT inline T operator()(const T &a, const T &b) const
+  {
+    if (this->IsValid(a) && this->IsValid(b))
+    {
+      return (a > b) ? a : b;
+    }
+    else if (!this->IsValid(a))
+    {
+      return b;
+    }
+    else if (!this->IsValid(b))
+    {
+      return a;
+    }
+    else
+    {
+      return this->MinValid;
+    }
+  }
+
+  VTKM_EXEC_CONT inline bool IsValid(const T &t) const
+  {
+    return !vtkm::IsNan(t) && t > MinValid && t < MaxValid;
+  }
+
+  T MinValid;
+  T MaxValid;
+};
+
+
+enum DataCheckFlags
+{
+  CheckNan          = 1 << 0,
+  CheckZero         = 1 << 1,
+  CheckMinExclusive = 1 << 2,
+  CheckMaxExclusive = 1 << 3,
+};
+
+template
+struct DataCheckVals
+{
+  T Min;
+  T Max;
+};
+
+inline DataCheckFlags operator|(DataCheckFlags lhs, DataCheckFlags rhs)
+{
+  return static_cast(static_cast(lhs) | static_cast(rhs));
+}
+
+template 
+struct CopyWithChecksMask : public vtkm::worklet::WorkletMapField
+{
+public:
+  using ControlSignature = void(FieldIn src, FieldOut dest);
+  using ExecutionSignature = void(_1, _2);
+
+  VTKM_CONT
+  CopyWithChecksMask(DataCheckFlags checks, DataCheckVals checkVals)
+      : Checks(checks),
+        CheckVals(checkVals)
+  {
+  }
+
+  VTKM_EXEC inline void operator()(const FloatType &val, vtkm::IdComponent& mask) const
+  {
+    bool passed = true;
+    if(this->HasCheck(CheckNan))
+    {
+      passed = passed && !vtkm::IsNan(val);   
+    }
+    if(this->HasCheck(CheckZero)) 
+    {
+      passed = passed && (val != FloatType(0));
+    }
+    if(this->HasCheck(CheckMinExclusive))
+    {
+      passed = passed && (val > this->CheckVals.Min);
+    }
+    if(this->HasCheck(CheckMaxExclusive))
+    {
+      passed = passed && (val < this->CheckVals.Max);
+    }
+
+    mask = passed ? 1 : 0;
+  }
+  
+  VTKM_EXEC inline bool HasCheck(DataCheckFlags check) const
+  {
+    return (Checks & check) == check;
+  }
+
+  DataCheckFlags Checks;
+  DataCheckVals CheckVals;
+};
+
+template
+vtkm::cont::ArrayHandle copyWithChecks(
+  const vtkm::cont::ArrayHandle& src, 
+  DataCheckFlags checks, 
+  DataCheckVals checkVals = DataCheckVals{})
+{
+  vtkm::cont::ArrayHandle mask;
+  vtkm::cont::Invoker invoker;
+  invoker(CopyWithChecksMask(checks, checkVals), src, mask);
+  
+  vtkm::cont::ArrayHandle dest;
+  vtkm::cont::Algorithm::CopyIf(src, mask, dest);
+  return dest;
+}
+
+template 
+vtkm::cont::ArrayHandle
+GetScalarDataAsArrayHandle(vtkh::DataSet &vtkhData, std::string field_name)
+{
+  //Get domain Ids on this rank
+  //will be nonzero even if there is no data
+  std::vector localDomainIds = vtkhData.GetDomainIds();
+  vtkm::cont::ArrayHandle totalFieldData;
+
+  if (!vtkhData.IsEmpty())
+  {
+    // Loop once to get the total number of items and reserve the vector
+    vtkm::Id totalNumberOfValues = std::accumulate(
+        localDomainIds.begin(),
+        localDomainIds.end(),
+        0,
+        [&](const vtkm::Id &acc, const vtkm::Id domainId)
+        {
+          const vtkm::cont::DataSet &dataset = vtkhData.GetDomain(domainId);
+          const vtkm::cont::Field &field = dataset.GetField(field_name);
+          return acc + field.GetData().GetNumberOfValues();
+        });
+
+    totalFieldData.Allocate(totalNumberOfValues);
+    vtkm::Id offset = 0;
+    for (auto &domainId : localDomainIds)
+    {
+      const vtkm::cont::DataSet &dataset = vtkhData.GetDomain(domainId);
+      const vtkm::cont::Field &field = dataset.GetField(field_name);
+      const auto fieldData = field.GetData().AsArrayHandle>();
+      copyArrayWithOffset(fieldData, totalFieldData, offset);
+      offset += fieldData.GetNumberOfValues();
+    }
+  }
+
+  return totalFieldData;
+}
+
+double
+calculateDataEntropy(vtkh::DataSet* dataset, std::string field_name, double field_min, double field_max, int bins)
+{
+  double entropy = 0.0;
+  int rank = 0;
+  #if VTKH_PARALLEL 
+  MPI_Comm mpi_comm = MPI_Comm_f2c(vtkh::GetMPICommHandle());
+  MPI_Comm_rank(mpi_comm, &rank);
+  #endif
+//dataset->PrintSummary(std::cerr);
+  using data_d = vtkm::cont::ArrayHandle;
+  using data_f = vtkm::cont::ArrayHandle;
+  
+  if(rank == 0)
+  {
+    vtkm::cont::Field field = dataset->GetField(field_name,0);
+
+    if(field.GetData().IsType())
+    {
+      auto field_data = GetScalarDataAsArrayHandle(*dataset, field_name.c_str());
+      if (field_data.GetNumberOfValues() > 0) 
+      {
+        DataCheckFlags checks = CheckNan | CheckZero;
+        field_data = copyWithChecks(field_data, checks);
+        entropy = calcEntropyMM(field_data, bins, field_min, field_max);
+      } 
+      else
+      {
+        entropy = 0;
+      }
+    }
+    else
+    {
+      auto field_data = GetScalarDataAsArrayHandle(*dataset, field_name.c_str());
+      if (field_data.GetNumberOfValues() > 0) 
+      {
+        DataCheckFlags checks = CheckNan | CheckZero;
+        field_data = copyWithChecks(field_data, checks);
+        entropy = calcEntropyMM(field_data, bins, vtkm::Float32(field_min), vtkm::Float32(field_max));
+      } 
+      else
+      {
+        entropy = 0;
+      }
+    }
+  }
+
+  #if VTKH_PARALLEL
+  MPI_Bcast(&entropy, 1, MPI_DOUBLE, 0, mpi_comm);
+  #endif
+  return entropy;
+}
+
+double 
+calculateDepthEntropy(vtkh::DataSet* dataset, std::string field_name, double diameter, int bins)
+{
+
+  double entropy = 0.0;
+  int rank = 0;
+  #if VTKH_PARALLEL 
+  MPI_Comm mpi_comm = MPI_Comm_f2c(vtkh::GetMPICommHandle());
+  MPI_Comm_rank(mpi_comm, &rank);
+  #endif
+
+  using data_d = vtkm::cont::ArrayHandle;
+  using data_f = vtkm::cont::ArrayHandle;
+
+  if(rank == 0)
+  {
+    vtkm::cont::Field field = dataset->GetField(field_name,0);
+
+    if(field.GetData().IsType())
+    {
+      auto field_data = GetScalarDataAsArrayHandle(*dataset, "depth");
+      if (field_data.GetNumberOfValues() > 0) 
+      {
+        DataCheckFlags checks = CheckNan | CheckMinExclusive | CheckMaxExclusive;
+        DataCheckVals checkVals; 
+	checkVals.Min = 0;
+       	checkVals.Max = vtkm::Float64(INT_MAX);
+        field_data = copyWithChecks(field_data, checks, checkVals);
+	vtkm::Float64 min = 0.0;
+        entropy = calcEntropyMM(field_data, bins, min, diameter);
+      } 
+      else
+      {
+        entropy = 0;
+      }
+    }
+    else
+    {
+      auto field_data = GetScalarDataAsArrayHandle(*dataset, "depth");
+      if (field_data.GetNumberOfValues() > 0) 
+      {
+        DataCheckFlags checks = CheckNan | CheckMinExclusive | CheckMaxExclusive;
+        DataCheckVals checkVals; 
+	checkVals.Min = 0;
+       	checkVals.Max = vtkm::Float32(INT_MAX);
+        field_data = copyWithChecks(field_data, checks, checkVals);
+	vtkm::Float32 min = 0.0;
+        entropy = calcEntropyMM(field_data, bins, min, vtkm::Float32(diameter));
+      } 
+      else
+      {
+        entropy = 0;
+      }
+    }
+  }
+  #if VTKH_PARALLEL
+  MPI_Bcast(&entropy, 1, MPI_DOUBLE, 0, mpi_comm);
+  #endif
+  return entropy;
+}
+
+double 
+calculateShadingEntropy(vtkh::DataSet* dataset, std::string field_name, int bins)
+{
+
+  double entropy = 0.0;
+  int rank = 0;
+  #if VTKH_PARALLEL 
+  MPI_Comm mpi_comm = MPI_Comm_f2c(vtkh::GetMPICommHandle());
+  MPI_Comm_rank(mpi_comm, &rank);
+  #endif
+
+  using data_d = vtkm::cont::ArrayHandle;
+  using data_f = vtkm::cont::ArrayHandle;
+
+  if(rank == 0)
+  {
+    vtkm::cont::Field field = dataset->GetField(field_name,0);
+
+    if(field.GetData().IsType())
+    {
+      auto field_data = GetScalarDataAsArrayHandle(*dataset, "shading");
+      if (field_data.GetNumberOfValues() > 0) 
+      {
+        DataCheckFlags checks = CheckNan | CheckMinExclusive | CheckMaxExclusive;
+        DataCheckVals checkVals; 
+	checkVals.Min = 0;
+       	checkVals.Max = vtkm::Float64(INT_MAX);
+        field_data = copyWithChecks(field_data, checks, checkVals);
+	vtkm::Float32 min = 0.0;
+	vtkm::Float32 max = 1.0;
+        entropy = calcEntropyMM(field_data, bins, min, max);
+      } 
+      else
+      {
+        entropy = 0;
+      }
+    }
+    else
+    {
+      auto field_data = GetScalarDataAsArrayHandle(*dataset, "shading");
+      if (field_data.GetNumberOfValues() > 0) 
+      {
+        DataCheckFlags checks = CheckNan | CheckMinExclusive | CheckMaxExclusive;
+        DataCheckVals checkVals; 
+	checkVals.Min = 0;
+       	checkVals.Max = vtkm::Float32(INT_MAX);
+        field_data = copyWithChecks(field_data, checks, checkVals);
+	vtkm::Float32 min = 0.0;
+	vtkm::Float32 max = 1.0;
+        entropy = calcEntropyMM(field_data, bins, min, max);
+      } 
+      else
+      {
+        entropy = 0;
+      }
+    }
+  }
+  #if VTKH_PARALLEL
+  MPI_Bcast(&entropy, 1, MPI_DOUBLE, 0, mpi_comm);
+  #endif
+  return entropy;
+}
+
+double
+calculateMetricScore(vtkh::DataSet* dataset, std::string metric, std::string field_name, vtkm::Float64 field_min, vtkm::Float64 field_max, double diameter, int bins)
+{
+  double score = 0.0;
+
+  if(metric == "data_entropy")
+  {
+    score = calculateDataEntropy(dataset, field_name, field_min, field_max, bins);
+  }
+  else if (metric == "dds_entropy")
+  {
+    double shading_score = calculateShadingEntropy(dataset, field_name, bins);
+    double data_score = calculateDataEntropy(dataset, field_name, field_min, field_max, bins);
+    double depth_score = calculateDepthEntropy(dataset, field_name, diameter, bins);
+    score = shading_score+data_score+depth_score;
+  }
+  else if (metric == "shading_entropy")
+  {
+    score = calculateShadingEntropy(dataset, field_name, bins);
+  }
+  else if (metric == "depth_entropy")
+  {
+    score = calculateDepthEntropy(dataset, field_name, diameter, bins);
+  }
+  else
+  {
+    std::stringstream msg;
+    msg<< "This metric '" << metric << "' is not supported. \n";
+    throw Error(msg.str());
+  }
+  return score;
+}
+
+void
+calculateDiameter(vtkm::Bounds bounds, double &diameter)
+{
+  vtkm::Float64 xb = vtkm::Float64(bounds.X.Length());
+  vtkm::Float64 yb = vtkm::Float64(bounds.Y.Length());
+  vtkm::Float64 zb = vtkm::Float64(bounds.Z.Length());
+  diameter = sqrt(xb*xb + yb*yb + zb*zb);
+
+}
+
+} // namespace detail
+
+AutoCamera::AutoCamera()
+  : m_bins(256),
+    m_height(1024),
+    m_width(1024)
+{
+
+}
+
+AutoCamera::~AutoCamera()
+{
+
+}
+
+void
+AutoCamera::SetMetric(std::string metric)
+{
+  m_metric = metric;
+}
+
+std::string
+AutoCamera::GetMetric()
+{
+  return m_metric;
+}
+
+void
+AutoCamera::SetField(std::string field)
+{
+  m_field = field;
+}
+
+std::string
+AutoCamera::GetField()
+{
+  return m_field;
+}
+
+void 
+AutoCamera::SetNumSamples(int samples)
+{
+  m_samples = samples;
+}
+
+int
+AutoCamera::GetNumSamples()
+{
+  return m_samples;
+}
+
+void 
+AutoCamera::SetNumBins(int bins)
+{
+  m_bins = bins;
+}
+
+int
+AutoCamera::GetNumBins()
+{
+  return m_bins;
+}
+
+void 
+AutoCamera::SetHeight(int height)
+{
+  m_height = height;
+}
+
+int
+AutoCamera::GetHeight()
+{
+  return m_height;
+}
+
+void 
+AutoCamera::SetWidth(int width)
+{
+  m_width = width;
+}
+
+int
+AutoCamera::GetWidth()
+{
+  return m_width;
+}
+
+vtkmCamera
+AutoCamera::GetCamera()
+{
+  return m_camera;
+}
+
+void
+AutoCamera::PreExecute()
+{
+  Filter::PreExecute();
+}
+
+void
+AutoCamera::DoExecute()
+{
+
+  int rank = 0;
+  int world_size = 0;
+  #if VTKH_PARALLEL
+  MPI_Comm mpi_comm = MPI_Comm_f2c(vtkh::GetMPICommHandle());
+  MPI_Comm_size(mpi_comm, &world_size);
+  MPI_Comm_rank(mpi_comm, &rank);
+  #endif
+  
+  vtkm::Range range = this->m_input->GetGlobalRange(m_field).ReadPortal().Get(0);
+  vtkm::Float64 field_min = range.Min;
+  vtkm::Float64 field_max = range.Max;
+
+  vtkm::Bounds g_bounds = this->m_input->GetGlobalBounds();
+  double diameter = 0.0;
+  detail::calculateDiameter(g_bounds, diameter);
+
+  vtkmCamera *camera = new vtkmCamera;
+  camera->ResetToBounds(g_bounds);
+  vtkm::Vec lookat = camera->GetLookAt();
+  float focus[3] = {lookat[0],lookat[1],lookat[2]};
+
+  double winning_score  = -1;
+  double losing_score   = 10000;
+  int   winning_sample = -1;
+  int   losing_sample  = -1;
+
+  int count = 0;
+
+  //loop through number of camera samples.
+  for(int sample = 0; sample < m_samples; sample++)
+  {
+  /*================ Scalar Renderer Code ======================*/
+
+    double cam_pos[3];
+    detail::GetCamera(sample, m_samples, diameter, focus, cam_pos);
+    vtkm::Vec pos{cam_pos[0],
+                            cam_pos[1],
+                            cam_pos[2]};
+
+    camera->SetPosition(pos);
+    vtkh::ScalarRenderer tracer;
+    tracer.SetWidth(m_width);
+    tracer.SetHeight(m_height);
+    tracer.SetInput(this->m_input); //vtkh dataset by toponame
+    tracer.SetCamera(*camera);
+    tracer.Update();
+
+    vtkh::DataSet *output = tracer.GetOutput();
+    //output->PrintSummary(std::cerr);
+
+    double score = detail::calculateMetricScore(output, m_metric, m_field, 
+						field_min, field_max, diameter, 
+						m_bins);
+    
+    //std::cerr << "sample " << sample << " score: " << score << std::endl;
+
+    delete output;
+
+  /*================ End Scalar Renderer  ======================*/
+
+    //original
+    if(winning_score < score)
+    {
+      winning_score = score;
+      winning_sample = sample;
+    }
+    if(losing_score > score)
+    {
+      losing_score = score;
+      losing_sample = sample;
+    }
+    count++;
+  } //end of sample loop
+
+  if(winning_sample == -1)
+  {
+    std::stringstream msg;
+    msg<<"Something went terribly wrong; No camera position was chosen\n";
+    throw Error(msg.str());
+  }
+
+  //std::cerr << "winner is sample " << winning_sample << " with score: " << winning_score << std::endl;
+
+  double best_c[3];
+  detail::GetCamera(winning_sample, m_samples, diameter, focus, best_c);
+
+  vtkm::Vec pos{best_c[0], 
+				best_c[1], 
+				best_c[2]}; 
+  camera->SetPosition(pos);
+  m_camera = *camera;
+
+  this->m_output = this->m_input;
+}
+
+void
+AutoCamera::PostExecute()
+{
+  Filter::PostExecute();
+}
+
+std::string
+AutoCamera::GetName() const
+{
+  return "vtkh::AutoCamera";
+}
+
+} // namespace vtkh
diff --git a/src/libs/vtkh/rendering/AutoCamera.hpp b/src/libs/vtkh/rendering/AutoCamera.hpp
new file mode 100644
index 000000000..2c0e6a6e6
--- /dev/null
+++ b/src/libs/vtkh/rendering/AutoCamera.hpp
@@ -0,0 +1,53 @@
+#ifndef VTK_H_AUTOCAMERA_HPP
+#define VTK_H_AUTOCAMERA_HPP
+
+#include 
+#include 
+#include 
+#include 
+#include 
+
+
+namespace vtkh
+{
+
+typedef vtkm::rendering::Camera vtkmCamera;
+
+class VTKH_API AutoCamera : public Filter
+{
+public:
+  AutoCamera();
+  virtual ~AutoCamera();
+
+  std::string GetName() const override;
+  std::string GetField();
+  std::string GetMetric();
+  int GetNumSamples();
+  int GetNumBins();
+  int GetHeight();
+  int GetWidth();
+
+  vtkmCamera GetCamera();
+
+  void SetMetric(std::string metric);
+  void SetField(std::string field);
+  void SetNumSamples(int num_samples);
+  void SetNumBins(int bins);
+  void SetHeight(int height);
+  void SetWidth(int width);
+  
+protected:
+  void PreExecute() override;
+  void PostExecute() override;
+  void DoExecute() override;
+  int m_bins;
+  int m_height;
+  int m_width;
+  int m_samples;
+  std::string m_field;
+  std::string m_metric;
+  vtkmCamera m_camera;
+};
+
+} //namespace vtkh
+#endif
diff --git a/src/libs/vtkh/rendering/CMakeLists.txt b/src/libs/vtkh/rendering/CMakeLists.txt
index f929e3484..bde13fbdc 100644
--- a/src/libs/vtkh/rendering/CMakeLists.txt
+++ b/src/libs/vtkh/rendering/CMakeLists.txt
@@ -3,6 +3,7 @@
 #==============================================================================
 set(vtkh_rendering_headers
     Annotator.hpp
+    AutoCamera.hpp
     LineRenderer.hpp
     MeshRenderer.hpp
     RayTracer.hpp
@@ -16,6 +17,7 @@ set(vtkh_rendering_headers
 
 set(vtkh_rendering_sources
     Annotator.cpp
+    AutoCamera.cpp
     LineRenderer.cpp
     MeshRenderer.cpp
     RayTracer.cpp
diff --git a/src/libs/vtkh/rendering/Render.cpp b/src/libs/vtkh/rendering/Render.cpp
index bbab36366..9350d6f42 100644
--- a/src/libs/vtkh/rendering/Render.cpp
+++ b/src/libs/vtkh/rendering/Render.cpp
@@ -144,6 +144,12 @@ Render::SetComments(const std::vector &comments)
   m_comments = comments;
 }
 
+void
+Render::SetColorBarPosition(std::vector color_bar_position)
+{
+  m_color_bar_position = color_bar_position;
+}
+
 void
 Render::SetBackgroundColor(float bg_color[4])
 {
@@ -212,7 +218,10 @@ Render::RenderScreenAnnotations(const std::vector &field_names,
 
   if(!m_render_annotations) return;
   Annotator annotator(m_canvas, m_camera, m_scene_bounds);
-  annotator.RenderScreenAnnotations(field_names, ranges, colors);
+  if(m_color_bar_position.size() == 0)
+    annotator.RenderScreenAnnotations(field_names, ranges, colors);
+  else
+    annotator.RenderScreenAnnotations(field_names, ranges, colors, m_color_bar_position);
 }
 
 Render
@@ -231,6 +240,7 @@ Render::Copy() const
   copy.m_shading = m_shading;
   copy.m_canvas = CreateCanvas();
   copy.m_world_annotation_scale = m_world_annotation_scale;
+  copy.m_color_bar_position = m_color_bar_position;
   return copy;
 }
 
@@ -265,7 +275,12 @@ Render::Print() const
 void
 Render::RenderBackground()
 {
-  if(m_render_background) m_canvas.BlendBackground();
+  if(m_render_background)
+  {
+    m_canvas.SetBackgroundColor(m_bg_color);
+    m_canvas.SetForegroundColor(m_fg_color);
+    m_canvas.BlendBackground();
+  }
 }
 
 Render::vtkmCanvas
diff --git a/src/libs/vtkh/rendering/Render.hpp b/src/libs/vtkh/rendering/Render.hpp
index 4edbe30cf..be8303514 100644
--- a/src/libs/vtkh/rendering/Render.hpp
+++ b/src/libs/vtkh/rendering/Render.hpp
@@ -50,6 +50,7 @@ class VTKH_API Render
   void                            SetCamera(const vtkm::rendering::Camera &camera);
   void                            SetImageName(const std::string &name);
   void                            SetComments(const std::vector &comments);
+  void                            SetColorBarPosition(std::vector color_bar_position);
   void                            SetBackgroundColor(float bg_color[4]);
   void                            SetForegroundColor(float fg_color[4]);
   void                            SetShadingOn(bool on);
@@ -69,6 +70,7 @@ class VTKH_API Render
   vtkm::rendering::Color       m_bg_color;
   vtkm::rendering::Color       m_fg_color;
   vtkmCanvas                   CreateCanvas() const;
+  std::vector    m_color_bar_position;
   bool                         m_render_annotations;
   bool                         m_render_world_annotations;
   bool                         m_render_screen_annotations;
diff --git a/src/tests/_baseline_images/tout_ascent_field_filtering_binning_filter100.png b/src/tests/_baseline_images/tout_ascent_field_filtering_binning_filter100.png
new file mode 100644
index 000000000..fb6ecc767
Binary files /dev/null and b/src/tests/_baseline_images/tout_ascent_field_filtering_binning_filter100.png differ
diff --git a/src/tests/_baseline_images/tout_auto_camera100.png b/src/tests/_baseline_images/tout_auto_camera100.png
new file mode 100644
index 000000000..b146d5616
Binary files /dev/null and b/src/tests/_baseline_images/tout_auto_camera100.png differ
diff --git a/src/tests/_baseline_images/tout_binning_filter_bins_int64100.png b/src/tests/_baseline_images/tout_binning_filter_bins_int64100.png
new file mode 100644
index 000000000..8959980d3
Binary files /dev/null and b/src/tests/_baseline_images/tout_binning_filter_bins_int64100.png differ
diff --git a/src/tests/_baseline_images/tout_color_bar100.png b/src/tests/_baseline_images/tout_color_bar100.png
new file mode 100644
index 000000000..c33cb29d9
Binary files /dev/null and b/src/tests/_baseline_images/tout_color_bar100.png differ
diff --git a/src/tests/_baseline_images/tout_in_memory_extract_render_slice_3d100.png b/src/tests/_baseline_images/tout_in_memory_extract_render_slice_3d100.png
new file mode 100644
index 000000000..4a66586e2
Binary files /dev/null and b/src/tests/_baseline_images/tout_in_memory_extract_render_slice_3d100.png differ
diff --git a/src/tests/_baseline_images/tout_multi_topo_ghosts100.png b/src/tests/_baseline_images/tout_multi_topo_ghosts100.png
index e706d5062..e474d76a4 100644
Binary files a/src/tests/_baseline_images/tout_multi_topo_ghosts100.png and b/src/tests/_baseline_images/tout_multi_topo_ghosts100.png differ
diff --git a/src/tests/_baseline_images/tout_multi_topo_single_ghost_vol_render100.png b/src/tests/_baseline_images/tout_multi_topo_single_ghost_vol_render100.png
new file mode 100644
index 000000000..deeb677ea
Binary files /dev/null and b/src/tests/_baseline_images/tout_multi_topo_single_ghost_vol_render100.png differ
diff --git a/src/tests/_baseline_images/tout_render_3d_braid_points_implicit100.png b/src/tests/_baseline_images/tout_render_3d_braid_points_implicit100.png
new file mode 100644
index 000000000..b06a93672
Binary files /dev/null and b/src/tests/_baseline_images/tout_render_3d_braid_points_implicit100.png differ
diff --git a/src/tests/_test_data/fuel.txt b/src/tests/_test_data/fuel.txt
new file mode 100644
index 000000000..f84f71658
--- /dev/null
+++ b/src/tests/_test_data/fuel.txt
@@ -0,0 +1,2 @@
+64 64 64 
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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
\ No newline at end of file
diff --git a/src/tests/ascent/CMakeLists.txt b/src/tests/ascent/CMakeLists.txt
index d4dad3f3b..f0b67cb67 100644
--- a/src/tests/ascent/CMakeLists.txt
+++ b/src/tests/ascent/CMakeLists.txt
@@ -21,10 +21,12 @@ set(BASIC_TESTS t_ascent_smoke
                 t_ascent_empty_runtime
                 t_ascent_expressions
                 t_ascent_cinema_a
+		t_ascent_color_bar_pos
                 t_ascent_render_2d
                 t_ascent_render_3d
                 t_ascent_render_2d_poly
                 t_ascent_render_3d_poly
+		t_ascent_render_auto_camera
                 t_ascent_info
                 t_ascent_render_bounds
                 t_ascent_web_flow
@@ -37,6 +39,7 @@ set(BASIC_TESTS t_ascent_smoke
                 t_ascent_divergence
                 t_ascent_vorticity
                 t_ascent_relay
+                t_ascent_conduit_extract
                 t_ascent_htg
                 t_ascent_flatten
                 t_ascent_partition
@@ -59,6 +62,7 @@ set(BASIC_TESTS t_ascent_smoke
                 t_ascent_amr
                 t_ascent_queries
                 t_ascent_failed_pipeline
+                t_ascent_commands
                 t_ascent_triggers
                 t_ascent_blueprint_reductions
                 t_ascent_sampling
@@ -87,7 +91,8 @@ set(MPI_TESTS  t_ascent_mpi_smoke
                t_ascent_mpi_render_3d
                t_ascent_mpi_statistics
                t_ascent_mpi_multi_topo
-               t_ascent_mpi_slice)
+               t_ascent_mpi_slice
+	       t_ascent_mpi_unique_ids)
 
 # t_ascent_hola_mpi uses 8 mpi tasks, so its added manually
 # same for t_ascent_babelflow_pmt_mpi and t_ascent_babelflow_comp_mpi
diff --git a/src/tests/ascent/t_ascent_blueprint_reductions.cpp b/src/tests/ascent/t_ascent_blueprint_reductions.cpp
index 99a5470c4..e8d6f5867 100644
--- a/src/tests/ascent/t_ascent_blueprint_reductions.cpp
+++ b/src/tests/ascent/t_ascent_blueprint_reductions.cpp
@@ -53,7 +53,7 @@
 #include 
 #include 
 #include 
-#include 
+#include 
 
 #include 
 #include 
diff --git a/src/tests/ascent/t_ascent_color_bar_pos.cpp b/src/tests/ascent/t_ascent_color_bar_pos.cpp
new file mode 100644
index 000000000..c28b283d4
--- /dev/null
+++ b/src/tests/ascent/t_ascent_color_bar_pos.cpp
@@ -0,0 +1,112 @@
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+// Copyright (c) Lawrence Livermore National Security, LLC and other Ascent
+// Project developers. See top-level LICENSE AND COPYRIGHT files for dates and
+// other details. No copyright assignment is required to contribute to Ascent.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+//-----------------------------------------------------------------------------
+///
+/// file: t_ascent_render_bounds.cpp
+///
+//-----------------------------------------------------------------------------
+
+#include "gtest/gtest.h"
+
+#include 
+
+#include 
+#include 
+
+#include 
+
+#include "t_config.hpp"
+#include "t_utils.hpp"
+
+
+
+using namespace std;
+using namespace conduit;
+using namespace ascent;
+
+index_t EXAMPLE_MESH_SIDE_DIM = 50;
+
+//-----------------------------------------------------------------------------
+TEST(ascent_color_bar_pos, test_color_bar_pos)
+{
+    // the vtkm runtime is currently our only rendering runtime
+    Node n;
+    ascent::about(n);
+    // only run this test if ascent was built with vtkm support
+    if(n["runtimes/ascent/vtkm/status"].as_string() == "disabled") {
+        ASCENT_INFO("Ascent vtkm support disabled, skipping test");
+        return;
+    }
+
+    //
+    // Create example mesh.
+    //
+    Node data, verify_info;
+    conduit::blueprint::mesh::examples::braid("rectilinear",
+                                               EXAMPLE_MESH_SIDE_DIM,
+                                               EXAMPLE_MESH_SIDE_DIM,
+                                               EXAMPLE_MESH_SIDE_DIM,
+                                               data);
+
+    EXPECT_TRUE(conduit::blueprint::mesh::verify(data,verify_info));
+    string output_path = prepare_output_dir();
+    string output_file = conduit::utils::join_file_path(output_path,
+                                             "tout_color_bar");
+    // remove old images before rendering
+    remove_test_image(output_file);
+
+    //
+    // Create the actions.
+    //
+    Node actions;
+
+    conduit::Node scenes;
+    scenes["scene1/plots/plt1/type"]         = "pseudocolor";
+    scenes["scene1/plots/plt1/field"]        = "braid";
+    scenes["scene1/renders/r1/image_prefix"] = output_file;
+    scenes["scene1/renders/r1/color_bar_position"].set({0.84,0.92,-0.8,-0.1}); 
+
+    conduit::Node &add_scenes = actions.append();
+    add_scenes["action"] = "add_scenes";
+    add_scenes["scenes"] = scenes;
+
+    //
+    // Run Ascent
+    //
+
+    Ascent ascent;
+    Node ascent_opts;
+    // default is now ascent
+    ascent_opts["runtime/type"] = "ascent";
+    ascent.open(ascent_opts);
+    ascent.publish(data);
+    ascent.execute(actions);
+    ascent.close();
+
+    // check that we created an image
+    EXPECT_TRUE(check_test_image(output_file));
+    std::string msg = "An example changing the color bar position";
+    ASCENT_ACTIONS_DUMP(actions,output_file,msg);
+}
+
+//-----------------------------------------------------------------------------
+int main(int argc, char* argv[])
+{
+    int result = 0;
+
+    ::testing::InitGoogleTest(&argc, argv);
+
+    // allow override of the data size via the command line
+    if(argc == 2)
+    {
+        EXAMPLE_MESH_SIDE_DIM = atoi(argv[1]);
+    }
+
+    result = RUN_ALL_TESTS();
+    return result;
+}
+
+
diff --git a/src/tests/ascent/t_ascent_commands.cpp b/src/tests/ascent/t_ascent_commands.cpp
new file mode 100644
index 000000000..3807240ad
--- /dev/null
+++ b/src/tests/ascent/t_ascent_commands.cpp
@@ -0,0 +1,393 @@
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+// Copyright (c) Lawrence Livermore National Security, LLC and other Ascent
+// Project developers. See top-level LICENSE AND COPYRIGHT files for dates and
+// other details. No copyright assignment is required to contribute to Ascent.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+//-----------------------------------------------------------------------------
+///
+/// file: t_ascent_commands.cpp
+///
+//-----------------------------------------------------------------------------
+
+#include "gtest/gtest.h"
+
+#include 
+
+#include 
+#include 
+
+#include 
+
+#include "t_config.hpp"
+#include "t_utils.hpp"
+
+
+
+using namespace std;
+using namespace conduit;
+using namespace ascent;
+
+index_t EXAMPLE_MESH_SIDE_DIM = 32;
+bool example_bool_1 = false;
+const bool example_bool_2 = true;
+
+//-----------------------------------------------------------------------------
+void void_callback_1(conduit::Node ¶ms, conduit::Node &output)
+{
+    output["param_was_passed"] = false;
+    if (params.has_path("example_param"))
+    {
+        output["param_was_passed"] = true;
+    }
+}
+
+//-----------------------------------------------------------------------------
+void void_callback_2(conduit::Node ¶ms, conduit::Node &output)
+{
+    if (example_bool_1)
+    {
+        example_bool_1 = false;
+    }
+    else
+    {
+        example_bool_1 = true;
+    }
+}
+
+//-----------------------------------------------------------------------------
+bool bool_callback_1()
+{
+    return example_bool_2;
+}
+
+//-----------------------------------------------------------------------------
+bool bool_callback_2()
+{
+    return !example_bool_2;
+}
+
+//-----------------------------------------------------------------------------
+TEST(ascent_commands, register_no_name_void)
+{
+    // Reset callbacks
+    ascent::reset_callbacks();
+
+    // An error should be thrown due to not including a name
+    EXPECT_ANY_THROW(ascent::register_callback("", void_callback_1));
+}
+
+//-----------------------------------------------------------------------------
+TEST(ascent_commands, register_no_name_bool)
+{
+    // Reset callbacks
+    ascent::reset_callbacks();
+
+    // An error should be thrown due to not including a name
+    EXPECT_ANY_THROW(ascent::register_callback("", bool_callback_1));
+}
+
+//-----------------------------------------------------------------------------
+TEST(ascent_commands, register_void_callbacks)
+{
+    // Reset callbacks
+    ascent::reset_callbacks();
+
+    // No error should be thrown
+    EXPECT_NO_THROW(ascent::register_callback("void_callback_1", void_callback_1));
+    EXPECT_NO_THROW(ascent::register_callback("void_callback_2", void_callback_2));
+}
+
+//-----------------------------------------------------------------------------
+TEST(ascent_commands, register_bool_callbacks)
+{
+    // Reset callbacks
+    ascent::reset_callbacks();
+
+    // No error should be thrown
+    EXPECT_NO_THROW(ascent::register_callback("bool_callback_1", bool_callback_1));
+    EXPECT_NO_THROW(ascent::register_callback("bool_callback_2", bool_callback_2));
+}
+
+//-----------------------------------------------------------------------------
+TEST(ascent_commands, register_same_callback_twice_mixed)
+{
+    // Reset callbacks
+    ascent::reset_callbacks();
+
+    // Register callbacks
+    EXPECT_NO_THROW(ascent::register_callback("test_callback", void_callback_1));
+
+    // An error should be thrown for registering the same callback name twice
+    EXPECT_ANY_THROW(ascent::register_callback("test_callback", bool_callback_1));
+}
+
+//-----------------------------------------------------------------------------
+TEST(ascent_commands, register_same_void_callback_twice)
+{
+    // Reset callbacks
+    ascent::reset_callbacks();
+
+    // Register callbacks
+    EXPECT_NO_THROW(ascent::register_callback("void_callback", void_callback_1));
+
+    // An error should be thrown registering the same callback name twice
+    EXPECT_ANY_THROW(ascent::register_callback("void_callback", void_callback_2));
+}
+
+//-----------------------------------------------------------------------------
+TEST(ascent_commands, register_same_bool_callback_twice)
+{
+    // Reset callbacks
+    ascent::reset_callbacks();
+
+    // Register callbacks
+    EXPECT_NO_THROW(ascent::register_callback("bool_callback", bool_callback_1));
+
+    // An error should be thrown registering the same callback name twice
+    EXPECT_ANY_THROW(ascent::register_callback("bool_callback", bool_callback_2));
+}
+
+//-----------------------------------------------------------------------------
+TEST(ascent_commands, direct_void_callback_invocation)
+{
+    // Reset callbacks
+    ascent::reset_callbacks();
+
+    // Register callbacks
+    ascent::register_callback("void_callback_1", void_callback_1);
+
+    Node params;
+    Node output;
+    ascent::execute_callback("void_callback_1", params, output);
+
+    // We didn't pass a parameter, so we expect param_was_passed to be false
+    bool has_output = false;
+    if (output.has_path("param_was_passed"))
+    {
+        has_output = output["param_was_passed"].to_uint8();
+    }
+    EXPECT_FALSE(has_output);
+
+    params.reset();
+    output.reset();
+
+    params["example_param"] = 1234;
+    ascent::execute_callback("void_callback_1", params, output);
+
+    // We passed a parameter, so we expect param_was_passed to be true
+    if (output.has_path("param_was_passed"))
+    {
+        has_output = output["param_was_passed"].to_uint8();
+    }
+    EXPECT_TRUE(has_output);
+}
+
+//-----------------------------------------------------------------------------
+TEST(ascent_commands, actions_shell_command_invocation)
+{
+    string file_name = "actions_shell_command_invocation_test";
+    string output_path = prepare_output_dir();
+    string file_path = conduit::utils::join_file_path(output_path, file_name);
+
+    // remove old file
+    if (conduit::utils::is_file(file_path))
+    {
+        conduit::utils::remove_file(file_path);
+    }
+
+    //
+    // Create the actions.
+    //
+    Node actions;
+
+    conduit::Node commands;
+#ifdef ASCENT_PLATFORM_WINDOWS
+    string shell_command = "type nul > " + file_path;
+#else
+    string shell_command = "touch " + file_path;
+#endif
+    commands["c1/params/shell_command"] = shell_command;
+    commands["c1/params/mpi_behavior"] = "root";
+
+    conduit::Node &add_commands = actions.append();
+    add_commands["action"] = "add_commands";
+    add_commands["commands"] = commands;
+    actions.print();
+
+    //
+    // Run Ascent
+    //
+    Ascent ascent;
+    Node ascent_opts;
+    // default is now ascent
+    ascent_opts["runtime/type"] = "ascent";
+    ascent.open(ascent_opts);
+    ascent.execute(actions);
+
+    // This file should have been created by the shell command invocation
+    EXPECT_TRUE(conduit::utils::is_file(file_path));
+
+    std::string msg = "An example of directly invoking a shell command"
+                      " from Ascent actions.";
+    ASCENT_ACTIONS_DUMP(actions, std::string("actions_shell_command_invocation"), msg);
+
+    ascent.close();
+}
+
+//-----------------------------------------------------------------------------
+TEST(ascent_commands, actions_void_callback_invocation)
+{
+    // Reset callbacks
+    ascent::reset_callbacks();
+
+    // Register callbacks
+    ascent::register_callback("void_callback_2", void_callback_2);
+
+    //
+    // Create the actions.
+    //
+    Node actions;
+
+    conduit::Node commands;
+    commands["c1/params/callback"] = "void_callback_2";
+    commands["c1/params/mpi_behavior"] = "all";
+
+    conduit::Node &add_commands = actions.append();
+    add_commands["action"] = "add_commands";
+    add_commands["commands"] = commands;
+    actions.print();
+
+    //
+    // Run Ascent
+    //
+    Ascent ascent;
+    Node ascent_opts;
+    // default is now ascent
+    ascent_opts["runtime/type"] = "ascent";
+    ascent.open(ascent_opts);
+
+    // void_callback_2 should make example_bool_1 true
+    EXPECT_FALSE(example_bool_1);
+    ascent.execute(actions);
+    EXPECT_TRUE(example_bool_1);
+
+    std::string msg = "An example of invoking a void callback from Ascent actions.";
+    ASCENT_ACTIONS_DUMP(actions, std::string("actions_void_callback_invocation"), msg);
+
+    ascent.close();
+}
+
+//-----------------------------------------------------------------------------
+TEST(ascent_commands, bool_callback_trigger_condition)
+{
+    // Reset callbacks
+    ascent::reset_callbacks();
+
+    // Register callbacks
+    ascent::register_callback("bool_callback_1", bool_callback_1);
+
+    // the vtkm runtime is currently our only rendering runtime
+    Node n;
+    ascent::about(n);
+    // only run this test if ascent was built with vtkm support
+    if (n["runtimes/ascent/vtkm/status"].as_string() == "disabled")
+    {
+        ASCENT_INFO("Ascent support disabled, skipping test");
+        return;
+    }
+
+    //
+    // Create example mesh.
+    //
+    Node data, verify_info;
+    conduit::blueprint::mesh::examples::braid("hexs",
+                                              EXAMPLE_MESH_SIDE_DIM,
+                                              EXAMPLE_MESH_SIDE_DIM,
+                                              EXAMPLE_MESH_SIDE_DIM,
+                                              data);
+
+    EXPECT_TRUE(conduit::blueprint::mesh::verify(data, verify_info));
+
+    string output_path = prepare_output_dir();
+    string trigger_file = conduit::utils::join_file_path(output_path, "callback_trigger_actions");
+    string output_file = conduit::utils::join_file_path(output_path, "tout_callback_trigger_actions");
+
+    // remove old trigger file
+    if (conduit::utils::is_file(trigger_file))
+    {
+        conduit::utils::remove_file(trigger_file);
+    }
+
+    // remove old output file
+    if (conduit::utils::is_file(output_file))
+    {
+        conduit::utils::remove_file(output_file);
+    }
+
+    //
+    // Create trigger actions.
+    //
+    Node trigger_actions;
+
+    conduit::Node extracts;
+
+    extracts["e1/type"] = "relay";
+    extracts["e1/params/path"] = output_file;
+
+    conduit::Node &add_ext = trigger_actions.append();
+    add_ext["action"] = "add_extracts";
+    add_ext["extracts"] = extracts;
+
+    trigger_actions.save(trigger_file, "json");
+
+    //
+    // Create the actions.
+    //
+    Node actions;
+
+    conduit::Node triggers;
+    triggers["t1/params/callback"] = "bool_callback_1";
+    triggers["t1/params/actions_file"] = trigger_file;
+
+    conduit::Node &add_triggers = actions.append();
+    add_triggers["action"] = "add_triggers";
+    add_triggers["triggers"] = triggers;
+    actions.print();
+
+    //
+    // Run Ascent
+    //
+    Ascent ascent;
+    Node ascent_opts;
+
+    // default is now ascent
+    ascent_opts["runtime/type"] = "ascent";
+    ascent.open(ascent_opts);
+    ascent.publish(data);
+    ascent.execute(actions);
+
+    // Verify that the trigger fired, and that the output file was created
+    EXPECT_TRUE(conduit::utils::is_file(output_file));
+
+    std::string msg = "An example of triggering actions using a bool callback.";
+    ASCENT_ACTIONS_DUMP(actions, std::string("bool_callback_trigger_condition"), msg);
+
+    ascent.close();
+}
+
+//-----------------------------------------------------------------------------
+int main(int argc, char* argv[])
+{
+    int result = 0;
+
+    ::testing::InitGoogleTest(&argc, argv);
+
+    // allow override of the data size via the command line
+    if(argc == 2)
+    {
+        EXAMPLE_MESH_SIDE_DIM = atoi(argv[1]);
+    }
+
+    result = RUN_ALL_TESTS();
+    return result;
+}
diff --git a/src/tests/ascent/t_ascent_conduit_extract.cpp b/src/tests/ascent/t_ascent_conduit_extract.cpp
new file mode 100644
index 000000000..ab5799dd4
--- /dev/null
+++ b/src/tests/ascent/t_ascent_conduit_extract.cpp
@@ -0,0 +1,208 @@
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+// Copyright (c) Lawrence Livermore National Security, LLC and other Ascent
+// Project developers. See top-level LICENSE AND COPYRIGHT files for dates and
+// other details. No copyright assignment is required to contribute to Ascent.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+
+//-----------------------------------------------------------------------------
+///
+/// file: t_ascent_relay.cpp
+///
+//-----------------------------------------------------------------------------
+
+
+#include "gtest/gtest.h"
+
+#include 
+
+#include 
+#include 
+
+#include 
+#include 
+
+#include "t_config.hpp"
+#include "t_utils.hpp"
+
+
+using namespace std;
+using namespace conduit;
+using namespace ascent;
+
+
+index_t EXAMPLE_MESH_SIDE_DIM = 10;
+
+//-----------------------------------------------------------------------------
+TEST(ascent_conduit_extract, test_pass_thru)
+{
+    Node n;
+    ascent::about(n);
+
+    //
+    // Create an example mesh.
+    //
+    Node data, verify_info;
+    conduit::blueprint::mesh::examples::braid("hexs",
+                                              EXAMPLE_MESH_SIDE_DIM,
+                                              EXAMPLE_MESH_SIDE_DIM,
+                                              EXAMPLE_MESH_SIDE_DIM,
+                                              data);
+
+    data["state/domain_id"] = 0;
+
+    EXPECT_TRUE(conduit::blueprint::mesh::verify(data,verify_info));
+
+    ASCENT_INFO("Testing conduit  extract in serial");
+    
+    conduit::Node actions;
+    conduit::Node &add_extracts = actions.append();
+    add_extracts["action"] = "add_extracts";
+    conduit::Node &extracts = add_extracts["extracts"];
+    // add the extract
+    extracts["e1/type"]  = "conduit";
+
+    std::cout << actions.to_yaml() << std::endl;
+
+    //
+    // Run Ascent
+    //
+    Ascent ascent;
+    ascent.open();
+    ascent.publish(data);
+    ascent.execute(actions);
+    conduit::Node & info =  ascent.info();
+
+    // copy out our extract
+    conduit::Node extract_copy;
+    extract_copy.set(info["extracts"][0]);
+
+    ascent.close();
+    // diff to make sure data looks as we expect
+    Node diff_info;
+    EXPECT_FALSE(extract_copy["data"][0].diff(data,diff_info));
+}
+
+//-----------------------------------------------------------------------------
+TEST(ascent_conduit_extract, test_pipeline_result)
+{
+    Node n;
+    ascent::about(n);
+
+    // only run this test if ascent was built with vtkm support
+    if(n["runtimes/ascent/vtkm/status"].as_string() == "disabled")
+    {
+        ASCENT_INFO("Ascent vtkm support disabled, skipping test");
+        return;
+    }
+
+    //
+    // Create an example mesh.
+    //
+    Node data, verify_info;
+    conduit::blueprint::mesh::examples::braid("hexs",
+                                              EXAMPLE_MESH_SIDE_DIM,
+                                              EXAMPLE_MESH_SIDE_DIM,
+                                              EXAMPLE_MESH_SIDE_DIM,
+                                              data);
+
+    EXPECT_TRUE(conduit::blueprint::mesh::verify(data,verify_info));
+
+    ASCENT_INFO("Testing slice to in-memory extract");
+
+    //
+    // Create the actions.
+    //
+    // slice + conduit in memory extract
+    conduit::Node actions;
+    // add the pipeline
+
+    conduit::Node &add_pipelines = actions.append();
+    add_pipelines["action"] = "add_pipelines";
+    conduit::Node &pipelines = add_pipelines["pipelines"];
+
+    // pipeline 1
+    pipelines["pl1/f1/type"] = "slice";
+    // filter knobs
+    conduit::Node &slice_params = pipelines["pl1/f1/params"];
+    slice_params["point/x"] = 0.f;
+    slice_params["point/y"] = 0.f;
+    slice_params["point/z"] = 0.f;
+
+    slice_params["normal/x"] = 0.f;
+    slice_params["normal/y"] = 0.f;
+    slice_params["normal/z"] = 1.f;
+
+    conduit::Node &add_extracts = actions.append();
+    add_extracts["action"] = "add_extracts";
+    conduit::Node &extracts = add_extracts["extracts"];
+    // add the extract
+    extracts["e1/type"]  = "conduit";
+    extracts["e1/pipeline"] = "pl1";
+
+    std::cout << actions.to_yaml() << std::endl;
+
+    //
+    // Run Ascent
+    //
+    Ascent ascent;
+    ascent.open();
+    ascent.publish(data);
+    ascent.execute(actions);
+    conduit::Node & info = ascent.info();
+
+    // copy out our extract
+    conduit::Node extract_copy;
+    extract_copy.set(info["extracts"][0]);
+
+    ascent.close();
+
+    // pass back copy and render the result
+
+    string output_path = prepare_output_dir();
+    string output_file = conduit::utils::join_file_path(output_path,
+                                            "tout_in_memory_extract_render_slice_3d");
+
+    // remove old images before rendering
+    remove_test_image(output_file);
+
+    actions.reset();
+
+    // add the scenes
+    conduit::Node &add_scenes= actions.append();
+    add_scenes["action"] = "add_scenes";
+    conduit::Node &scenes  = add_scenes["scenes"];
+
+    scenes["s1/plots/p1/type"]  = "pseudocolor";
+    scenes["s1/plots/p1/field"] = "radial";
+    scenes["s1/image_prefix"] = output_file;
+
+    ascent.open();
+    ascent.publish(extract_copy["data"]);
+    ascent.execute(actions);
+    ascent.close();
+
+    // check that we created an image
+    EXPECT_TRUE(check_test_image(output_file));
+
+}
+
+
+
+//-----------------------------------------------------------------------------
+int main(int argc, char* argv[])
+{
+    int result = 0;
+
+    ::testing::InitGoogleTest(&argc, argv);
+
+    // allow override of the data size via the command line
+    if(argc == 2)
+    {
+        EXAMPLE_MESH_SIDE_DIM = atoi(argv[1]);
+    }
+
+    result = RUN_ALL_TESTS();
+    return result;
+}
+
+
diff --git a/src/tests/ascent/t_ascent_conduit_reductions.cpp b/src/tests/ascent/t_ascent_conduit_reductions.cpp
index 698179592..44f2fc8b8 100644
--- a/src/tests/ascent/t_ascent_conduit_reductions.cpp
+++ b/src/tests/ascent/t_ascent_conduit_reductions.cpp
@@ -15,7 +15,7 @@
 #include 
 #include 
 #include 
-#include 
+#include 
 #include 
 
 #include 
@@ -33,9 +33,8 @@ using namespace ascent;
 index_t EXAMPLE_MESH_SIDE_DIM = 5;
 
 
-
 //-----------------------------------------------------------------------------
-TEST(ascent_conduit_reductions, go)
+TEST(ascent_blueprint_reductions, go)
 {
   conduit::Node input, res;
 
diff --git a/src/tests/ascent/t_ascent_data_binning.cpp b/src/tests/ascent/t_ascent_data_binning.cpp
index 7cf747436..98814bf28 100644
--- a/src/tests/ascent/t_ascent_data_binning.cpp
+++ b/src/tests/ascent/t_ascent_data_binning.cpp
@@ -233,25 +233,25 @@ TEST(ascent_binning, filter_braid_binning_mesh)
   // filter knobs
   conduit::Node ¶ms = pipelines["pl1/f1/params"];
   params["reduction_op"] = "sum";
-  params["var"] = "braid";
+  params["reduction_field"] = "braid";
   params["output_field"] = "binning";
   // paint the field onto the original mesh
   params["output_type"] = "mesh";
 
   conduit::Node &axis0 = params["axes"].append();
-  axis0["var"] = "x";
+  axis0["field"] = "x";
   axis0["num_bins"] = 10;
   axis0["min_val"] = -10.0;
   axis0["max_val"] = 10.0;
   axis0["clamp"] = 1;
 
   conduit::Node &axis1 = params["axes"].append();
-  axis1["var"] = "y";
+  axis1["field"] = "y";
   axis1["num_bins"] = 10;
   axis1["clamp"] = 0;
 
   conduit::Node &axis2 = params["axes"].append();
-  axis2["var"] = "z";
+  axis2["field"] = "z";
   axis2["num_bins"] = 10;
   axis2["clamp"] = 10;
 
@@ -276,10 +276,7 @@ TEST(ascent_binning, filter_braid_binning_mesh)
   //
 
   Ascent ascent;
-
-  Node ascent_opts;
-  ascent_opts["runtime/type"] = "ascent";
-  ascent.open(ascent_opts);
+  ascent.open();
   ascent.publish(data);
   ascent.execute(actions);
   ascent.close();
@@ -317,25 +314,25 @@ TEST(ascent_binning, filter_braid_binning_bins)
   // filter knobs
   conduit::Node ¶ms = pipelines["pl1/f1/params"];
   params["reduction_op"] = "sum";
-  params["var"] = "braid";
+  params["reduction_field"] = "braid";
   params["output_field"] = "binning";
   // reduced dataset of only the bins
   params["output_type"] = "bins";
 
   conduit::Node &axis0 = params["axes"].append();
-  axis0["var"] = "x";
+  axis0["field"] = "x";
   axis0["num_bins"] = 10;
   axis0["min_val"] = -10.0;
   axis0["max_val"] = 10.0;
   axis0["clamp"] = 1;
 
   conduit::Node &axis1 = params["axes"].append();
-  axis1["var"] = "y";
+  axis1["field"] = "y";
   axis1["num_bins"] = 10;
   axis1["clamp"] = 0;
 
   conduit::Node &axis2 = params["axes"].append();
-  axis2["var"] = "z";
+  axis2["field"] = "z";
   axis2["num_bins"] = 10;
   axis2["clamp"] = 10;
 
@@ -360,10 +357,94 @@ TEST(ascent_binning, filter_braid_binning_bins)
   //
 
   Ascent ascent;
+  ascent.open();
+  ascent.publish(data);
+  ascent.execute(actions);
+  ascent.close();
+
+  EXPECT_TRUE(check_test_image(output_file, 0.1));
+  std::string msg = "An example of data binning, binning spatially and summing a field.";
+  ASCENT_ACTIONS_DUMP(actions,output_file,msg);
+}
+
+
+//-----------------------------------------------------------------------------
+// this is here b/c there was a bug with using int64 for num_bins
+// that caused a conduit access error b/c we expected int32 only
+//-----------------------------------------------------------------------------
+TEST(ascent_binning, filter_braid_binning_bins_int64_params)
+{
+  // the vtkm runtime is currently our only rendering runtime
+  Node n;
+  ascent::about(n);
+  // only run this test if ascent was built with vtkm support
+  if(n["runtimes/ascent/vtkm/status"].as_string() == "disabled")
+  {
+    ASCENT_INFO("Ascent support disabled, skipping test");
+    return;
+  }
+
+  string output_path = prepare_output_dir();
+  std::string output_file =
+      conduit::utils::join_file_path(output_path, "tout_binning_filter_bins_int64");
 
-  Node ascent_opts;
-  ascent_opts["runtime/type"] = "ascent";
-  ascent.open(ascent_opts);
+  remove_test_image(output_file);
+  //
+  // Create an example mesh.
+  //
+  Node data, verify_info;
+  conduit::blueprint::mesh::examples::braid("hexs", 20, 20, 20, data);
+
+  conduit::Node pipelines;
+  // pipeline 1
+  pipelines["pl1/f1/type"] = "binning";
+  // filter knobs
+  conduit::Node ¶ms = pipelines["pl1/f1/params"];
+  params["reduction_op"] = "sum";
+  params["reduction_field"] = "braid";
+  params["output_field"] = "binning";
+  // reduced dataset of only the bins
+  params["output_type"] = "bins";
+
+  conduit::Node &axis0 = params["axes"].append();
+  axis0["field"] = "x";
+  axis0["num_bins"] = (int64)10;
+  axis0["min_val"] = -10.0;
+  axis0["max_val"] = 10.0;
+  axis0["clamp"] =  (int64)1;
+
+  conduit::Node &axis1 = params["axes"].append();
+  axis1["field"] = "y";
+  axis1["num_bins"] = (int64)10;
+  axis1["clamp"] = (int64)0;
+
+  conduit::Node &axis2 = params["axes"].append();
+  axis2["field"] = "z";
+  axis2["num_bins"] = (int64)10;
+  axis2["clamp"] = 1; // <--?
+
+  conduit::Node scenes;
+  scenes["s1/plots/p1/type"] = "pseudocolor";
+  scenes["s1/plots/p1/field"] = "binning";
+  scenes["s1/plots/p1/pipeline"] = "pl1";
+  scenes["s1/image_prefix"] = output_file;
+
+  conduit::Node actions;
+  // add the pipeline
+  conduit::Node &add_pipelines= actions.append();
+  add_pipelines["action"] = "add_pipelines";
+  add_pipelines["pipelines"] = pipelines;
+  // add the scenes
+  conduit::Node &add_scenes= actions.append();
+  add_scenes["action"] = "add_scenes";
+  add_scenes["scenes"] = scenes;
+
+  //
+  // Run Ascent
+  //
+
+  Ascent ascent;
+  ascent.open();
   ascent.publish(data);
   ascent.execute(actions);
   ascent.close();
@@ -371,6 +452,7 @@ TEST(ascent_binning, filter_braid_binning_bins)
   EXPECT_TRUE(check_test_image(output_file, 0.1));
 }
 
+
 //-----------------------------------------------------------------------------
 TEST(ascent_binning, expr_braid_non_spatial_bins)
 {
@@ -420,10 +502,7 @@ TEST(ascent_binning, expr_braid_non_spatial_bins)
   //
 
   Ascent ascent;
-
-  Node ascent_opts;
-  ascent_opts["runtime/type"] = "ascent";
-  ascent.open(ascent_opts);
+  ascent.open();
   ascent.publish(data);
   ascent.execute(actions);
   Node ascent_info;
@@ -478,18 +557,18 @@ TEST(ascent_binning, filter_braid_non_spatial_bins)
   // filter knobs
   conduit::Node ¶ms = pipelines["pl1/f2/params"];
   params["reduction_op"] = "sum";
-  params["var"] = "braid";
+  params["reduction_field"] = "braid";
   params["output_field"] = "binning";
   // reduced dataset of only the bins
   params["output_type"] = "bins";
 
   conduit::Node &axis0 = params["axes"].append();
-  axis0["var"] = "radial";
+  axis0["field"] = "radial";
   axis0["num_bins"] = 10;
   axis0["clamp"] = 0;
 
   conduit::Node &axis1 = params["axes"].append();
-  axis1["var"] = "braid";
+  axis1["field"] = "braid";
   axis1["num_bins"] = 10;
   axis1["clamp"] = 0;
 
@@ -526,15 +605,15 @@ TEST(ascent_binning, filter_braid_non_spatial_bins)
   //
 
   Ascent ascent;
-
-  Node ascent_opts;
-  ascent_opts["runtime/type"] = "ascent";
-  ascent.open(ascent_opts);
+  ascent.open();
   ascent.publish(data);
   ascent.execute(actions);
   ascent.close();
 
   EXPECT_TRUE(check_test_image(output_file, 0.1));
+  
+  std::string msg = "An example of data binning, non-spatial binning and summing a field.";
+  
 }
 
 
diff --git a/src/tests/ascent/t_ascent_derived.cpp b/src/tests/ascent/t_ascent_derived.cpp
index 1af96bfe1..3c58a10ab 100644
--- a/src/tests/ascent/t_ascent_derived.cpp
+++ b/src/tests/ascent/t_ascent_derived.cpp
@@ -60,7 +60,7 @@ TEST(ascent_jit_expressions, derived_support_test)
   std::string expr;
 
   expr = "builtin_avg = avg(sin(field('radial')))\n"
-         "num_elements = sum(derived_field(1.0, 'mesh', 'element'))\n"
+         "num_elements = sum(constant_field(1.0, 'mesh', 'element'))\n"
          "manual_avg = sum(sin(field('radial'))) / num_elements\n"
          "builtin_avg == manual_avg";
 
@@ -136,7 +136,7 @@ TEST(ascent_expressions, derived_simple)
   res = eval.evaluate(expr);
 
   expr = "builtin_avg = avg(sin(field('radial')))\n"
-         "num_elements = sum(derived_field(1.0, 'mesh', 'element'))\n"
+         "num_elements = sum(constant_field(1.0, 'mesh', 'element'))\n"
          "manual_avg = sum(sin(field('radial'))) / num_elements\n"
          "builtin_avg == manual_avg";
   res = eval.evaluate(expr);
@@ -322,7 +322,7 @@ TEST(ascent_expressions, derived_mesh_specific_paths)
     EXPECT_EQ(res["type"].as_string(), "double");
 
     expr = "builtin_avg = avg(sin(field('radial')))\n"
-           "num_elements = sum(derived_field(1.0, 'mesh', 'element'))\n"
+           "num_elements = sum(constant_field(1.0, 'mesh', 'element'))\n"
            "manual_avg = sum(sin(field('radial'))) / num_elements\n"
            "builtin_avg == manual_avg";
     res = eval.evaluate(expr);
diff --git a/src/tests/ascent/t_ascent_expressions.cpp b/src/tests/ascent/t_ascent_expressions.cpp
index 529650508..a46bf3f68 100644
--- a/src/tests/ascent/t_ascent_expressions.cpp
+++ b/src/tests/ascent/t_ascent_expressions.cpp
@@ -658,7 +658,7 @@ TEST(ascent_expressions, test_history)
 }
 
 //-----------------------------------------------------------------------------
-TEST(ascent_expressions, test_gradient_scalar)
+TEST(ascent_expressions, test_history_gradient)
 {
   Node n;
   ascent::about(n);
diff --git a/src/tests/ascent/t_ascent_mpi_unique_ids.cpp b/src/tests/ascent/t_ascent_mpi_unique_ids.cpp
new file mode 100644
index 000000000..05557db66
--- /dev/null
+++ b/src/tests/ascent/t_ascent_mpi_unique_ids.cpp
@@ -0,0 +1,149 @@
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+// Copyright (c) Lawrence Livermore National Security, LLC and other Ascent
+// Project developers. See top-level LICENSE AND COPYRIGHT files for dates and
+// other details. No copyright assignment is required to contribute to Ascent.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+
+//-----------------------------------------------------------------------------
+///
+/// file: t_ascent_partition.cpp
+///
+//-----------------------------------------------------------------------------
+
+
+#include "gtest/gtest.h"
+
+#include 
+#include 
+
+#include 
+#include 
+#include 
+
+#include 
+#include 
+#include 
+
+#include "t_config.hpp"
+#include "t_utils.hpp"
+
+
+using namespace std;
+using namespace conduit;
+using namespace ascent;
+
+//-----------------------------------------------------------------------------
+TEST(ascent_partition, test_indiv_rank_non_unique)
+{
+    Node n;
+    ascent::about(n);
+
+    //
+    // Create an example mesh.
+    //
+    Node data, verify_info;
+
+    //
+    //Set Up MPI
+    //
+    int par_rank;
+    int par_size;
+    MPI_Comm comm = MPI_COMM_WORLD;
+    MPI_Comm_rank(comm, &par_rank);
+    MPI_Comm_size(comm, &par_size);
+
+    // use spiral , with 20 domains
+    conduit::blueprint::mpi::mesh::examples::spiral_round_robin(20,data,comm);
+
+    EXPECT_TRUE(conduit::blueprint::mesh::verify(data,verify_info));
+
+    int root = 0;
+    if(par_rank == root)
+    	ASCENT_INFO("Testing local non unique IDs");
+
+    int num_domains = data.number_of_children();
+    for(int i = 0; i < num_domains; i++)
+    {
+      conduit::Node &dom = data.child(i);
+      dom["state/domain_id"] = 0;
+    }
+    
+    //
+    // Run Ascent
+    //
+
+    Ascent ascent;
+
+    Node ascent_opts;
+    ascent_opts["runtime"] = "ascent";
+    ascent_opts["mpi_comm"] = MPI_Comm_c2f(comm);
+    ascent_opts["exceptions"] = "forward";
+    ascent.open(ascent_opts);
+
+    EXPECT_THROW(ascent.publish(data),conduit::Error);
+}
+//-----------------------------------------------------------------------------
+TEST(ascent_partition, test_global_ranks_non_unique)
+{
+    Node n;
+    ascent::about(n);
+
+    //
+    // Create an example mesh.
+    //
+    Node data, verify_info;
+
+    //
+    //Set Up MPI
+    //
+    int par_rank;
+    int par_size;
+    MPI_Comm comm = MPI_COMM_WORLD;
+    MPI_Comm_rank(comm, &par_rank);
+    MPI_Comm_size(comm, &par_size);
+
+    // use spiral , with 20 domains
+    conduit::blueprint::mpi::mesh::examples::spiral_round_robin(20,data,comm);
+
+    EXPECT_TRUE(conduit::blueprint::mesh::verify(data,verify_info));
+
+    int root = 0;
+    if(par_rank == root)
+    	ASCENT_INFO("Testing global non unique IDs");
+
+    int num_domains = data.number_of_children();
+    for(int i = 0; i < num_domains; i++)
+    {
+      conduit::Node &dom = data.child(i);
+      dom["state/domain_id"] = i;
+    }
+    
+    //
+    // Run Ascent
+    //
+
+    Ascent ascent;
+
+    Node ascent_opts;
+    ascent_opts["runtime"] = "ascent";
+    ascent_opts["mpi_comm"] = MPI_Comm_c2f(comm);
+    ascent_opts["exceptions"] = "forward";
+    ascent.open(ascent_opts);
+
+    EXPECT_THROW(ascent.publish(data),conduit::Error);
+}
+
+//-----------------------------------------------------------------------------
+int main(int argc, char* argv[])
+{
+    int result = 0;
+
+    ::testing::InitGoogleTest(&argc, argv);
+    MPI_Init(&argc, &argv);
+
+    result = RUN_ALL_TESTS();
+    MPI_Finalize();
+    return result;
+}
+
+
diff --git a/src/tests/ascent/t_ascent_multi_topo.cpp b/src/tests/ascent/t_ascent_multi_topo.cpp
index 55183c783..3437145a4 100644
--- a/src/tests/ascent/t_ascent_multi_topo.cpp
+++ b/src/tests/ascent/t_ascent_multi_topo.cpp
@@ -19,6 +19,7 @@
 #include 
 
 #include 
+#include 
 
 #include "t_config.hpp"
 #include "t_utils.hpp"
@@ -39,21 +40,29 @@ TEST(ascent_multi_topo, test_render)
         return;
     }
 
+    ASCENT_INFO("Render multiple topologies");
+
     //
     // Create an example mesh.
     //
     Node data;
     build_multi_topo(data,10);
 
-    ASCENT_INFO("Render multiple topologies");
-
 
     string output_path = prepare_output_dir();
     string output_file = conduit::utils::join_file_path(output_path,"tout_multi_topo");
-
     // remove old images before rendering
     remove_test_image(output_file);
 
+    // save the dataset so we can explore in visit
+    Node opts;
+    opts["file_style"] = "root_only";
+    opts["suffix"] = "none";
+    conduit::relay::io::blueprint::save_mesh(data,"my_multi","hdf5",opts);
+
+    string output_dataset = conduit::utils::join_file_path(output_path,"tout_multi_topo_dataset");
+    remove_test_image(output_dataset);
+
 
     //
     // Create the actions.
@@ -167,6 +176,86 @@ TEST(ascent_multi_topo, single_ghost)
     std::string msg = "Example of adding 1 ghost field with 2 topologies";
     ASCENT_ACTIONS_DUMP(actions,output_file,msg);
 }
+
+//-----------------------------------------------------------------------------
+TEST(ascent_multi_topo, single_ghost_vol_render)
+{
+    Node n;
+    ascent::about(n);
+    // only run this test if ascent was built with vtkm support
+    if(n["runtimes/ascent/vtkm/status"].as_string() == "disabled")
+    {
+        ASCENT_INFO("Ascent vtkm support disabled, skipping test");
+        return;
+    }
+
+    //
+    // Create an example mesh.
+    //
+    Node data;
+    build_multi_topo(data,10);
+
+    ASCENT_INFO("single ghost test with multiple topologies");
+
+
+    string output_path = prepare_output_dir();
+    string output_file = conduit::utils::join_file_path(output_path,"tout_multi_topo_single_ghost_vol_render");
+
+    // remove old images before rendering
+    remove_test_image(output_file);
+
+
+    //
+    // Create the actions.
+    //
+
+    conduit::Node actions;
+    // add the scenes
+    conduit::Node &add_scenes= actions.append();
+    add_scenes["action"] = "add_scenes";
+    conduit::Node & scenes = add_scenes["scenes"];
+    scenes["s1/plots/p1/type"] = "volume";
+    scenes["s1/plots/p1/field"] = "braid";
+    scenes["s1/plots/p1/min_value"] =  -0.5;
+    scenes["s1/plots/p1/max_value"] =   0.5;
+    scenes["s1/plots/p1/color_table/name"] =   "rainbow desaturated";
+
+    conduit::Node &cp1 = scenes["s1/plots/p1/color_table/control_points"].append();
+    cp1["type"] = "alpha";
+    cp1["position"] = 0.0;
+    cp1["alpha"] = 0.2 ;
+
+    conduit::Node &cp2 = scenes["s1/plots/p1/color_table/control_points"].append();
+    cp2["type"] = "alpha";
+    cp2["position"] = 1.0;
+    cp2["alpha"]=  0.5 ;
+
+    scenes["s1/renders/r1/image_prefix"] = output_file;
+    scenes["s1/renders/r1/annotations"] = "false";
+    scenes["s1/renders/r1/camera/azimuth"] = 170;
+    scenes["s1/renders/r1/camera/elevation"] = 11;
+
+
+    //
+    // Run Ascent
+    //
+
+    Ascent ascent;
+
+    Node ascent_opts;
+    ascent_opts["runtime/type"] = "ascent";
+    ascent_opts["ghost_field_name"] = "cell_ghosts";
+    ascent.open(ascent_opts);
+    ascent.publish(data);
+    ascent.execute(actions);
+    ascent.close();
+
+    // check that we created an image
+    EXPECT_TRUE(check_test_image(output_file, 0.02));
+    std::string msg = "Example volume rendering a ragged ghost field";
+    ASCENT_ACTIONS_DUMP(actions,output_file,msg);
+}
+
 //-----------------------------------------------------------------------------
 TEST(ascent_multi_topo, multi_ghosts)
 {
@@ -209,7 +298,7 @@ TEST(ascent_multi_topo, multi_ghosts)
 
     scenes["s1/renders/r1/image_prefix"] = output_file;
     scenes["s1/renders/r1/annotations"] = "false";
-    scenes["s1/renders/r1/camera/azimuth"] = 30;
+    scenes["s1/renders/r1/camera/azimuth"] = 170;
     scenes["s1/renders/r1/camera/elevation"] = 11;
 
     conduit::Node actions;
diff --git a/src/tests/ascent/t_ascent_relay.cpp b/src/tests/ascent/t_ascent_relay.cpp
index 82f418762..4113bbaec 100644
--- a/src/tests/ascent/t_ascent_relay.cpp
+++ b/src/tests/ascent/t_ascent_relay.cpp
@@ -33,7 +33,7 @@ using namespace ascent;
 index_t EXAMPLE_MESH_SIDE_DIM = 20;
 
 //-----------------------------------------------------------------------------
-TEST(ascent_relay, test_relay)
+TEST(ascent_relay, test_relay_hdf5)
 {
     Node n;
     ascent::about(n);
@@ -159,6 +159,106 @@ TEST(ascent_relay, test_relay_hdf5_2)
 }
 
 
+//-----------------------------------------------------------------------------
+TEST(ascent_relay, test_relay_hdf5_opts)
+{
+    Node n;
+    ascent::about(n);
+
+    ASCENT_INFO("Testing relay extract in serial with hdf5 gzip opts");
+
+    //
+    // Create an example mesh.
+    //
+    Node data, verify_info;
+    conduit::blueprint::mesh::examples::basic("uniform",
+                                              1001,
+                                              11,
+                                              11,
+                                              data);
+
+    EXPECT_TRUE(conduit::blueprint::mesh::verify(data,verify_info));
+    // change values -- zeros compress nicely .... 
+    float64_array vals = data["fields/field/values"].value();
+    vals.fill(0);
+    index_t nele = vals.number_of_elements();
+
+    std::cout << "Field Number of Elements: " << nele << std::endl;
+    std::cout << "Field Number of Bytes:    " << nele * 8 << std::endl;
+
+    string output_path = prepare_output_dir();
+
+    string output_file_pre = conduit::utils::join_file_path(output_path,"tout_relay_hdf5_opts_000");
+    string output_root_pre = output_file_pre + ".cycle_000100.root";
+
+    string output_file_opts = conduit::utils::join_file_path(output_path,"tout_relay_hdf5_opts_001");
+    string output_root_opts = output_file_opts + ".cycle_000100.root";
+
+    string output_file_post = conduit::utils::join_file_path(output_path,"tout_relay_hdf5_opts_002");
+    string output_root_post = output_file_post + ".cycle_000100.root";
+
+
+    // remove old files before executing
+    remove_test_image(output_root_pre);
+    remove_test_image(output_root_opts);
+    remove_test_image(output_root_post);
+
+    conduit::Node actions;
+    // add the extracts
+    conduit::Node &add_extracts = actions.append();
+    add_extracts["action"] = "add_extracts";
+    Node &extracts = add_extracts["extracts"];
+
+    extracts["e1/type"]  = "relay";
+    extracts["e1/params/path"] = output_file_pre;
+    extracts["e1/params/protocol"] = "hdf5";
+
+    //
+    // Run Ascent
+    //
+    Ascent ascent;
+    ascent.open();
+    ascent.publish(data);
+    ascent.execute(actions);
+
+    // run again with hdf5 options that will trigger
+    // compression for the known inputs in this tests
+    extracts["e1/params/path"] = output_file_opts;
+    extracts["e1/params/hdf5_options/chunking/enabled"]  = "true";
+    // Note: https://github.com/LLNL/conduit/issues/1137
+    extracts["e1/params/hdf5_options/chunking/threshold"]  = 800000-1;
+    extracts["e1/params/hdf5_options/chunking/chunk_size"] = 800000;
+    extracts["e1/params/hdf5_options/chunking/compression/level"] = 9;
+
+    ascent.execute(actions);
+
+    // back to default
+    extracts["e1/params/path"] = output_file_post;
+    extracts.remove("e1/params/hdf5_options");
+
+    ascent.execute(actions);
+
+    ascent.close();
+
+    index_t fsize_pre  = conduit::utils::file_size(output_root_pre);
+    index_t fsize_opts = conduit::utils::file_size(output_root_opts);
+    index_t fsize_post = conduit::utils::file_size(output_root_post);
+    // pre and post should be the same
+    EXPECT_EQ(fsize_pre,fsize_post);
+
+    // compression should help us out
+    EXPECT_TRUE(fsize_pre > fsize_opts);
+
+    std::cout << "pre file:  " << output_root_pre << std::endl;
+    std::cout << "opts file: " << output_root_opts << std::endl;
+    std::cout << "post file: " << output_root_post << std::endl;
+
+    std::cout << "pre  size: " << fsize_pre  << std::endl;
+    std::cout << "opts size: " << fsize_opts << std::endl;
+    std::cout << "post size: " << fsize_post << std::endl;
+
+}//
+
 //-----------------------------------------------------------------------------
 TEST(ascent_relay, test_relay_json)
 {
@@ -202,7 +302,8 @@ TEST(ascent_relay, test_relay_json)
     conduit::Node &execute  = actions.append();
     execute["action"] = "execute";
 
-    actions.save("for_chris.yaml");
+    std::cout << actions.to_yaml() << std::endl;
+
     //
     // Run Ascent
     //
@@ -264,7 +365,7 @@ TEST(ascent_relay, test_relay_json_2)
     conduit::Node &execute  = actions.append();
     execute["action"] = "execute";
 
-    actions.save("for_chris.yaml");
+    std::cout << actions.to_yaml() << std::endl;
 
     //
     // Run Ascent
@@ -787,7 +888,7 @@ TEST(ascent_relay, test_relay_sparse_topos)
 
     Node data;
     ostringstream oss;
-    
+
     // three domains with different topos
     for(index_t d =0; d<4; d++)
     {
@@ -821,7 +922,7 @@ TEST(ascent_relay, test_relay_sparse_topos)
         // reference the coordinate set by name
         mesh["topologies"][t_name]["coordset"] = c_name;
 
-        // add a simple element-associated field 
+        // add a simple element-associated field
         mesh["fields"][f_name]["association"] =  "element";
         // reference the topology this field is defined on by name
         mesh["fields"][f_name]["topology"] =  t_name;
@@ -835,7 +936,7 @@ TEST(ascent_relay, test_relay_sparse_topos)
             ele_vals_ptr[i] = float64(d);
         }
     }
-    
+
     data.print();
 
     Node verify_info;
@@ -879,16 +980,14 @@ TEST(ascent_relay, test_relay_sparse_topos)
     ascent.publish(data);
     ascent.execute(actions);
     ascent.close();
-    
-    
+
+
     Node n_root;
     conduit::relay::io::load(output_file + ".cycle_000000.root","hdf5",n_root);
     n_root.print();
 }
 
 
-
-
 //-----------------------------------------------------------------------------
 int main(int argc, char* argv[])
 {
diff --git a/src/tests/ascent/t_ascent_render_3d.cpp b/src/tests/ascent/t_ascent_render_3d.cpp
index b05f13eb7..833ef1f95 100644
--- a/src/tests/ascent/t_ascent_render_3d.cpp
+++ b/src/tests/ascent/t_ascent_render_3d.cpp
@@ -2510,6 +2510,69 @@ TEST(ascent_render_3d, test_render_3d_supported_conn_dtypes)
     ascent.close();
 }
 
+
+//-----------------------------------------------------------------------------
+TEST(ascent_render_3d, test_render_3d_points_implicit_topo)
+{
+    // the ascent runtime is currently our only rendering runtime
+    Node n;
+    ascent::about(n);
+    // only run this test if ascent was built with vtkm support
+    if(n["runtimes/ascent/vtkm/status"].as_string() == "disabled")
+    {
+        ASCENT_INFO("Ascent support disabled, skipping 3D default"
+                      "Pipeline test");
+
+        return;
+    }
+
+    //
+    // Create an example mesh.
+    //
+    Node data, verify_info;
+    conduit::blueprint::mesh::examples::braid("points_implicit",
+                                              10,
+                                              10,
+                                              10,
+                                              data);
+
+
+    EXPECT_TRUE(conduit::blueprint::mesh::verify(data,verify_info));
+
+    ASCENT_INFO("Testing 3D Rendering of implicit points topology");
+
+    //
+    // Create the actions.
+    //
+    conduit::Node actions;
+    conduit::Node &add_plots = actions.append();
+    add_plots["action"] = "add_scenes";
+    conduit::Node &scenes = add_plots["scenes"];
+    scenes["s1/plots/p1/type"]  = "pseudocolor";
+    scenes["s1/plots/p1/field"] = "braid";
+
+
+    string output_path = prepare_output_dir();
+
+
+    string output_file = conduit::utils::join_file_path(output_path,
+                                    "tout_render_3d_braid_points_implicit");
+    // remove old images before rendering
+    remove_test_image(output_file);
+
+    Ascent ascent;
+    ascent.open();
+    ascent.publish(data);
+    scenes["s1/image_prefix"] = output_file;
+    ascent.execute(actions);
+    ascent.close();
+
+    // check that we created an image
+    EXPECT_TRUE(check_test_image(output_file));
+
+}
+
+
 // //-----------------------------------------------------------------------------
 TEST(ascent_render_3d, test_render_3d_extreme_extents)
 {
diff --git a/src/tests/ascent/t_ascent_render_auto_camera.cpp b/src/tests/ascent/t_ascent_render_auto_camera.cpp
new file mode 100644
index 000000000..d483273f0
--- /dev/null
+++ b/src/tests/ascent/t_ascent_render_auto_camera.cpp
@@ -0,0 +1,142 @@
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+// Copyright (c) Lawrence Livermore National Security, LLC and other Ascent
+// Project developers. See top-level LICENSE AND COPYRIGHT files for dates and
+// other details. No copyright assignment is required to contribute to Ascent.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+
+//-----------------------------------------------------------------------------
+///
+/// file: t_ascent_render_auto_camera.cpp
+///
+//-----------------------------------------------------------------------------
+
+
+#include "gtest/gtest.h"
+
+#include 
+
+#include 
+#include 
+
+#include 
+
+#include "t_config.hpp"
+#include "t_utils.hpp"
+
+
+
+
+using namespace std;
+using namespace conduit;
+using namespace ascent;
+
+
+index_t EXAMPLE_MESH_SIDE_DIM = 20;
+
+
+//-----------------------------------------------------------------------------
+TEST(ascent_iso_volume, test_iso_volume)
+{
+    // the vtkm runtime is currently our only rendering runtime
+    Node n;
+    ascent::about(n);
+    // only run this test if ascent was built with vtkm support
+    if(n["runtimes/ascent/vtkm/status"].as_string() == "disabled")
+    {
+        ASCENT_INFO("Ascent vtkm support disabled, skipping test");
+        return;
+    }
+
+    //
+    // Create an example mesh.
+    //
+    Node data, verify_info;
+    conduit::blueprint::mesh::examples::braid("hexs",
+                                              EXAMPLE_MESH_SIDE_DIM,
+                                              EXAMPLE_MESH_SIDE_DIM,
+                                              EXAMPLE_MESH_SIDE_DIM,
+                                              data);
+
+    EXPECT_TRUE(conduit::blueprint::mesh::verify(data,verify_info));
+
+    ASCENT_INFO("Testing 3D Rendering with Default Pipeline");
+
+
+    string output_path = prepare_output_dir();
+    string output_file = conduit::utils::join_file_path(output_path,"tout_auto_camera");
+
+    // remove old images before rendering
+    remove_test_image(output_file);
+
+
+    //
+    // Create the actions.
+    //
+
+    conduit::Node pipelines;
+    // pipeline 1
+    pipelines["pl1/f1/type"] = "isovolume";
+    // filter knobs
+    conduit::Node &clip_params = pipelines["pl1/f1/params"];
+    clip_params["field"] = "braid";
+    clip_params["min_value"] = 5.;
+    clip_params["max_value"] = 10.;
+
+    conduit::Node scenes;
+    scenes["s1/plots/p1/type"]         = "pseudocolor";
+    scenes["s1/plots/p1/field"] = "radial";
+    scenes["s1/plots/p1/pipeline"] = "pl1";
+    scenes["s1/renders/r1/type"] = "auto_camera";
+    scenes["s1/renders/r1/auto_camera/metric"] = "dds_entropy";
+    scenes["s1/renders/r1/auto_camera/samples"] = 5;
+    scenes["s1/renders/r1/auto_camera/field"] = "radial";
+    scenes["s1/renders/r1/image_prefix"] = output_file;
+
+    conduit::Node actions;
+    // add the pipeline
+    conduit::Node &add_pipelines= actions.append();
+    add_pipelines["action"] = "add_pipelines";
+    add_pipelines["pipelines"] = pipelines;
+    // add the scenes
+    conduit::Node &add_scenes= actions.append();
+    add_scenes["action"] = "add_scenes";
+    add_scenes["scenes"] = scenes;
+    
+
+    //
+    // Run Ascent
+    //
+
+    Ascent ascent;
+
+    Node ascent_opts;
+    ascent_opts["runtime/type"] = "ascent";
+    ascent.open(ascent_opts);
+    ascent.publish(data);
+    ascent.execute(actions);
+    ascent.close();
+
+    // check that we created an image
+    EXPECT_TRUE(check_test_image(output_file));
+    std::string msg = "An example of using the auto camera filter.";
+    ASCENT_ACTIONS_DUMP(actions,output_file,msg);
+}
+
+//-----------------------------------------------------------------------------
+int main(int argc, char* argv[])
+{
+    int result = 0;
+
+    ::testing::InitGoogleTest(&argc, argv);
+
+    // allow override of the data size via the command line
+    if(argc == 2)
+    {
+        EXAMPLE_MESH_SIDE_DIM = atoi(argv[1]);
+    }
+
+    result = RUN_ALL_TESTS();
+    return result;
+}
+
+
diff --git a/src/tests/ascent/t_ascent_runtime_options.cpp b/src/tests/ascent/t_ascent_runtime_options.cpp
index bf2dd1f52..501f0a53d 100644
--- a/src/tests/ascent/t_ascent_runtime_options.cpp
+++ b/src/tests/ascent/t_ascent_runtime_options.cpp
@@ -942,7 +942,7 @@ TEST(ascent_runtime_options, test_field_filtering_error)
     EXPECT_TRUE(error);
 }
 //-----------------------------------------------------------------------------
-TEST(ascent_runtime_options, test_field_filtering_binning)
+TEST(ascent_runtime_options, test_field_filtering_binning_expression)
 {
     Node n;
     ascent::about(n);
@@ -1007,6 +1007,105 @@ TEST(ascent_runtime_options, test_field_filtering_binning)
     ascent.execute(actions);
 }
 
+//-----------------------------------------------------------------------------
+TEST(ascent_runtime_options, test_field_filtering_binning_filter)
+{
+    Node n;
+    ascent::about(n);
+    // only run this test if ascent was built with vtkm support
+    if(n["runtimes/ascent/vtkm/status"].as_string() == "disabled")
+    {
+        ASCENT_INFO("Ascent vtkm support disabled, skipping test");
+        return;
+    }
+
+    //
+    // Create an example mesh.
+    //
+    Node data, verify_info;
+    conduit::blueprint::mesh::examples::braid("hexs",
+                                              EXAMPLE_MESH_SIDE_DIM,
+                                              EXAMPLE_MESH_SIDE_DIM,
+                                              EXAMPLE_MESH_SIDE_DIM,
+                                              data);
+    data["fields/bananas"] = data["fields/braid"];
+    EXPECT_TRUE(conduit::blueprint::mesh::verify(data,verify_info));
+
+    data["state/cycle"] = 100;
+    data["state/time"] = 1.3;
+    data["state/domain_id"] = 0;
+
+    ASCENT_INFO("Testing data binning field filtering support");
+
+
+    string output_path = prepare_output_dir();
+    std::string output_file =
+      conduit::utils::join_file_path(output_path, "tout_ascent_field_filtering_binning_filter");
+
+    remove_test_image(output_file);
+
+    //
+    // Create the actions.
+    //
+    conduit::Node pipelines;
+    // pipeline 1
+    pipelines["pl1/f1/type"] = "binning";
+    // filter knobs
+    conduit::Node ¶ms = pipelines["pl1/f1/params"];
+    params["reduction_op"] = "sum";
+    params["reduction_field"] = "braid";
+    params["output_field"] = "binning";
+    // reduced dataset of only the bins
+    params["output_type"] = "bins";
+
+    conduit::Node &axis0 = params["axes"].append();
+    axis0["field"] = "x";
+    axis0["num_bins"] = 10;
+    axis0["min_val"] = -10.0;
+    axis0["max_val"] = 10.0;
+    axis0["clamp"] = 1;
+
+    conduit::Node &axis1 = params["axes"].append();
+    axis1["field"] = "y";
+    axis1["num_bins"] = 10;
+    axis1["clamp"] = 0;
+
+    conduit::Node &axis2 = params["axes"].append();
+    axis2["field"] = "braid";
+    axis2["num_bins"] = 10;
+    axis2["clamp"] = 0;
+
+    conduit::Node scenes;
+    scenes["s1/plots/p1/type"] = "pseudocolor";
+    scenes["s1/plots/p1/field"] = "binning";
+    scenes["s1/plots/p1/pipeline"] = "pl1";
+    scenes["s1/image_prefix"] = output_file;
+
+    conduit::Node actions;
+    // add the pipeline
+    conduit::Node &add_pipelines= actions.append();
+    add_pipelines["action"] = "add_pipelines";
+    add_pipelines["pipelines"] = pipelines;
+    // add the scenes
+    conduit::Node &add_scenes= actions.append();
+    add_scenes["action"] = "add_scenes";
+    add_scenes["scenes"] = scenes;
+
+    //
+    // Run Ascent
+    //
+
+    Ascent ascent;
+    Node ascent_opts;
+    ascent_opts["field_filtering"] = "true";
+    ascent.open(ascent_opts);
+    ascent.publish(data);
+    ascent.execute(actions);
+    
+    EXPECT_TRUE(check_test_image(output_file, 0.1));
+}
+
+
 //-----------------------------------------------------------------------------
 TEST(ascent_runtime_options, test_field_filtering_lineout)
 {
diff --git a/src/tests/thirdparty/CMakeLists.txt b/src/tests/thirdparty/CMakeLists.txt
index 52b5f5eae..dd4cb2b95 100644
--- a/src/tests/thirdparty/CMakeLists.txt
+++ b/src/tests/thirdparty/CMakeLists.txt
@@ -18,6 +18,17 @@ if(HIP_FOUND)
     list(APPEND smoke_device_deps blt_hip)
 endif()
 
+set(conduit_smoke_deps conduit::conduit)
+
+if(ZLIB_FOUND)
+    message(STATUS "Adding zlib smoke test")
+    list(APPEND conduit_smoke_deps ZLIB::ZLIB)
+    add_cpp_test(TEST t_zlib_smoke DEPENDS_ON ZLIB::ZLIB)
+endif()
+
+message(STATUS "Adding conduit smoke test")
+add_cpp_test(TEST t_conduit_smoke DEPENDS_ON ${conduit_smoke_deps})
+
 if(CALIPER_FOUND)
     message(STATUS "Adding caliper smoke test")
     add_cpp_test(TEST t_caliper_smoke DEPENDS_ON caliper)
diff --git a/src/tests/thirdparty/t_conduit_smoke.cpp b/src/tests/thirdparty/t_conduit_smoke.cpp
new file mode 100644
index 000000000..1a4acabd9
--- /dev/null
+++ b/src/tests/thirdparty/t_conduit_smoke.cpp
@@ -0,0 +1,30 @@
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+// Copyright (c) Lawrence Livermore National Security, LLC and other Ascent
+// Project developers. See top-level LICENSE AND COPYRIGHT files for dates and
+// other details. No copyright assignment is required to contribute to Ascent.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+
+//-----------------------------------------------------------------------------
+///
+/// file: t_conduit_smoke.cpp
+///
+//-----------------------------------------------------------------------------
+
+#include "gtest/gtest.h"
+#include "conduit.hpp"
+#include "conduit_relay.hpp"
+#include "conduit_blueprint.hpp"
+
+
+//-----------------------------------------------------------------------------
+TEST(conduit_smoke, conduit_about)
+{
+    conduit::Node about;
+    conduit::about(about["conduit"]);
+    conduit::relay::about(about["conduit/relay"]);
+    conduit::relay::io::about(about["conduit/relay/io"]);
+    conduit::blueprint::about(about["conduit/blueprint"]);
+
+    std::cout << about.to_yaml() << std::endl;
+}
+
diff --git a/src/tests/thirdparty/t_zlib_smoke.cpp b/src/tests/thirdparty/t_zlib_smoke.cpp
new file mode 100644
index 000000000..f351bd906
--- /dev/null
+++ b/src/tests/thirdparty/t_zlib_smoke.cpp
@@ -0,0 +1,57 @@
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+// Copyright (c) Lawrence Livermore National Security, LLC and other Ascent
+// Project developers. See top-level LICENSE AND COPYRIGHT files for dates and
+// other details. No copyright assignment is required to contribute to Ascent.
+//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
+
+//-----------------------------------------------------------------------------
+///
+/// file: t_zlib_smoke.cpp
+///
+//-----------------------------------------------------------------------------
+
+#include "gtest/gtest.h"
+#include "zlib.h"
+
+//-----------------------------------------------------------------------------
+TEST(zlib_smoke, zlib_basic)
+{
+
+  // exercise compress and uncompress interface
+
+  Bytef compress_src[32];
+  Bytef compress_dest[64];
+  Bytef uncompress_dest[64];
+
+  uLongf compress_src_len    = 32;
+  uLongf compress_dest_len   = 64;
+  uLongf uncompress_dest_len = 64;
+
+  for(int i=0;i<32;i++)
+  {
+    compress_dest[i] = 0;
+    uncompress_dest[i] = 0;
+    // some pattern
+    compress_dest[i] = i > 4 && i < 28;
+  }
+
+  int compress_res = compress(compress_dest,
+                              &compress_dest_len,
+                              compress_src,
+                              compress_src_len);
+
+  EXPECT_EQ(Z_OK,compress_res);
+
+
+  int uncompress_res = uncompress(uncompress_dest,
+                                  &uncompress_dest_len,
+                                  compress_dest,
+                                  compress_dest_len);
+  EXPECT_EQ(Z_OK,uncompress_res);
+
+  for(int i=0;i<32;i++)
+  {
+    EXPECT_EQ(compress_src[i],uncompress_dest[i]);
+  }
+}
+
diff --git a/src/tests/vtkh/CMakeLists.txt b/src/tests/vtkh/CMakeLists.txt
index 2b9b5aa20..faadc930c 100644
--- a/src/tests/vtkh/CMakeLists.txt
+++ b/src/tests/vtkh/CMakeLists.txt
@@ -76,11 +76,11 @@ if (ENABLE_SERIAL)
     message(STATUS "Adding vtk-h lib unit tests")
     foreach(TEST ${BASIC_TESTS})
         if(ENABLE_CUDA)
-            add_cpp_test(TEST ${TEST} DEPENDS_ON vtkh cuda)
+            add_cpp_test(TEST ${TEST} DEPENDS_ON ascent vtkh cuda)
             vtkm_add_target_information(${TEST} DEVICE_SOURCES ${TEST}.cpp)
             set_target_properties(${TEST} PROPERTIES LINKER_LANGUAGE CUDA)
         else()
-            add_cpp_test(TEST ${TEST} DEPENDS_ON vtkh)
+            add_cpp_test(TEST ${TEST} DEPENDS_ON ascent vtkh)
             set_target_properties(${TEST} PROPERTIES LINKER_LANGUAGE CXX)
         endif()
         set_target_properties(${TEST} PROPERTIES CXX_VISIBILITY_PRESET hidden)
@@ -100,10 +100,10 @@ if(MPI_FOUND)
     foreach(TEST ${MPI_TESTS})
         # this uses 2 procs
         if(ENABLE_CUDA)
-            add_cpp_mpi_test(TEST ${TEST} NUM_PROCS 2 DEPENDS_ON vtkh_mpi cuda)
+            add_cpp_mpi_test(TEST ${TEST} NUM_PROCS 2 DEPENDS_ON ascent_mpi vtkh_mpi cuda)
             vtkm_add_target_information(${TEST} DEVICE_SOURCES ${TEST}.cpp)
         else()
-            add_cpp_mpi_test(TEST ${TEST} NUM_PROCS 2 DEPENDS_ON vtkh_mpi)
+            add_cpp_mpi_test(TEST ${TEST} NUM_PROCS 2 DEPENDS_ON ascent_mpi vtkh_mpi)
         endif()
         set_target_properties(${TEST} PROPERTIES CXX_VISIBILITY_PRESET hidden)
         target_compile_definitions(${TEST} PRIVATE VTKH_PARALLEL)
diff --git a/src/tests/vtkh/t_vtk-h_contour_tree.cpp b/src/tests/vtkh/t_vtk-h_contour_tree.cpp
index 6111fe9b3..d55d0d4bc 100644
--- a/src/tests/vtkh/t_vtk-h_contour_tree.cpp
+++ b/src/tests/vtkh/t_vtk-h_contour_tree.cpp
@@ -5,6 +5,7 @@
 //-----------------------------------------------------------------------------
 
 #include "gtest/gtest.h"
+#include "t_utils.hpp"
 
 #include 
 #include 
@@ -12,11 +13,10 @@
 #include "t_vtkm_test_utils.hpp"
 
 #include 
-#include 
 #include 
 #include 
 
-#include 
+#include 
 #include 
 
 #include 
@@ -46,9 +46,6 @@ DEFINE_MPI_CAST(MPI_Comm)
 using ValueType = vtkm::Float64;
 
 // This data will be written to disk for this test.
-char FUEL_DATA[] =
-"64 64 64 \n\
-0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ";
 
 // Number of blocks must be a power of 2
 inline vtkm::Id3 ComputeNumberOfBlocksPerAxis(vtkm::Id3 globalSize, vtkm::Id numberOfBlocks)
@@ -144,8 +141,9 @@ inline vtkm::cont::DataSet CreateSubDataSet(const vtkm::cont::DataSet& ds,
                                             const std::string& fieldName)
 {
   vtkm::Id3 globalSize;
-  ds.GetCellSet().CastAndCall(vtkm::worklet::contourtree_augmented::GetPointDimensions(),
-                              globalSize);
+  vtkm::cont::CastAndCall(
+    ds.GetCellSet(), vtkm::worklet::contourtree_augmented::GetPointDimensions(), globalSize);
+
   const vtkm::Id nOutValues = blockSize[0] * blockSize[1] * blockSize[2];
 
   const auto inDataArrayHandle = ds.GetPointField(fieldName).GetData();
@@ -210,7 +208,8 @@ void GetPartitionedDataSet( const vtkm::cont::DataSet& ds, const std::string &fi
 {
   // Get dimensions of data set
   vtkm::Id3 globalSize;
-  ds.GetCellSet().CastAndCall(vtkm::worklet::contourtree_augmented::GetPointDimensions(), globalSize);
+  vtkm::cont::CastAndCall(
+    ds.GetCellSet(), vtkm::worklet::contourtree_augmented::GetPointDimensions(), globalSize);
 
   // Determine split
   vtkm::Id3 blocksPerAxis = ComputeNumberOfBlocksPerAxis(globalSize, numberOfBlocks);
@@ -263,7 +262,7 @@ void GetPartitionedDataSet( const vtkm::cont::DataSet& ds, const std::string &fi
 #endif
 
 //----------------------------------------------------------------------------
-bool ReadTestData(const char* filename, VDATASET &inDataSet,
+bool ReadTestData(const std::string& filename, VDATASET &inDataSet,
                   const int mpiRank, const int mpiSize)
 {
   std::ifstream inFile(filename);
@@ -472,8 +471,7 @@ bool ReadTestData(const char* filename, VDATASET &inDataSet,
       vdims[2] = static_cast(dims[2]);
       *pds = dsb.Create(vdims);
     }
-    vtkm::cont::DataSetFieldAdd dsf;
-    dsf.AddPointField(*pds, "values", values);
+    pds->AddPointField("values", values);
   }
 
 #ifdef VTKM_ENABLE_MPI
@@ -486,21 +484,7 @@ bool ReadTestData(const char* filename, VDATASET &inDataSet,
 //----------------------------------------------------------------------------
 bool GetDataSet( vtkh::DataSet &data_set, const int mpiRank, const int mpiSize )
 {
-  const char *filename = "fuel.txt";
-
-  // Write Fuel data to file.
-  std::ofstream datafile;
-  datafile.open( filename );
-  if( datafile.is_open() )
-  {
-    datafile << FUEL_DATA;
-    datafile.close();
-  }
-  else
-  {
-    std::cout << "Error writing data file: " << filename << std::endl;
-    return( false );
-  }
+  const std::string filename = test_data_file("fuel.txt");
 
   VDATASET ds;
 
diff --git a/src/tests/vtkh/t_vtk-h_contour_tree_par.cpp b/src/tests/vtkh/t_vtk-h_contour_tree_par.cpp
index 6111fe9b3..c35850930 100644
--- a/src/tests/vtkh/t_vtk-h_contour_tree_par.cpp
+++ b/src/tests/vtkh/t_vtk-h_contour_tree_par.cpp
@@ -5,6 +5,7 @@
 //-----------------------------------------------------------------------------
 
 #include "gtest/gtest.h"
+#include "t_utils.hpp"
 
 #include 
 #include 
@@ -12,11 +13,10 @@
 #include "t_vtkm_test_utils.hpp"
 
 #include 
-#include 
 #include 
 #include 
 
-#include 
+#include 
 #include 
 
 #include 
@@ -45,71 +45,49 @@ DEFINE_MPI_CAST(MPI_Comm)
 
 using ValueType = vtkm::Float64;
 
-// This data will be written to disk for this test.
-char FUEL_DATA[] =
-"64 64 64 \n\
-0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ";
-
-// Number of blocks must be a power of 2
-inline vtkm::Id3 ComputeNumberOfBlocksPerAxis(vtkm::Id3 globalSize, vtkm::Id numberOfBlocks)
+inline vtkm::IdComponent FindSplitAxis(vtkm::Id3 globalSize)
 {
-  // DEBUG: std::cout << "GlobalSize: " << globalSize << " numberOfBlocks:" << numberOfBlocks << " -> ";
-  // Inefficient way to compute log2 of numberOfBlocks, i.e., number of total splits
-  vtkm::Id numSplits = 0;
-  vtkm::Id currNumberOfBlock = numberOfBlocks;
-  bool isPowerOfTwo = true;
-
-  while (currNumberOfBlock > 1)
+  vtkm::IdComponent splitAxis = 0;
+  for (vtkm::IdComponent d = 1; d < 3; ++d)
   {
-    if (currNumberOfBlock % 2 != 0)
+    if (globalSize[d] > globalSize[splitAxis])
     {
-      isPowerOfTwo = false;
-      break;
+      splitAxis = d;
     }
-    currNumberOfBlock /= 2;
-    ++numSplits;
   }
+  return splitAxis;
+}
 
-  if (isPowerOfTwo)
+inline vtkm::Id3 ComputeNumberOfBlocksPerAxis(vtkm::Id3 globalSize, vtkm::Id numberOfBlocks)
+{
+  // Split numberOfBlocks into a power of two and a remainder
+  vtkm::Id powerOfTwoPortion = 1;
+  while (numberOfBlocks % 2 == 0)
   {
-    vtkm::Id3 splitsPerAxis{ 0, 0, 0 };
-    while (numSplits > 0)
-    {
-      // Find split axis as axis with largest extent
-      vtkm::IdComponent splitAxis = 0;
-      for (vtkm::IdComponent d = 1; d < 3; ++d)
-        if (globalSize[d] > globalSize[splitAxis])
-          splitAxis = d;
-      // Split in half along that axis
-      // DEBUG: std::cout << splitAxis << " " << globalSize << std::endl;
-      VTKM_ASSERT(globalSize[splitAxis] > 1);
-      ++splitsPerAxis[splitAxis];
-      globalSize[splitAxis] /= 2;
-      --numSplits;
-    }
-    // DEBUG: std::cout << "splitsPerAxis: " << splitsPerAxis;
-    vtkm::Id3 blocksPerAxis;
-    for (vtkm::IdComponent d = 0; d < 3; ++d)
-      blocksPerAxis[d] = vtkm::Id{ 1 } << splitsPerAxis[d];
-    // DEBUG: std::cout << " blocksPerAxis: " << blocksPerAxis << std::endl;
-    return blocksPerAxis;
+    powerOfTwoPortion *= 2;
+    numberOfBlocks /= 2;
   }
-  else
+
+  vtkm::Id3 blocksPerAxis{ 1, 1, 1 };
+  if (numberOfBlocks > 1)
   {
-    std::cout << "numberOfBlocks is not a power of two. Splitting along longest axis." << std::endl;
-    vtkm::IdComponent splitAxis = 0;
-    for (vtkm::IdComponent d = 1; d < 3; ++d)
-    {
-      if (globalSize[d] > globalSize[splitAxis])
-      {
-        splitAxis = d;
-      }
-    }
-    vtkm::Id3 blocksPerAxis{ 1, 1, 1 };
+    // Split the longest axis according to remainder
+    vtkm::IdComponent splitAxis = FindSplitAxis(globalSize);
     blocksPerAxis[splitAxis] = numberOfBlocks;
-    // DEBUG: std::cout << " blocksPerAxis: " << blocksPerAxis << std::endl;
-    return blocksPerAxis;
+    globalSize[splitAxis] /= numberOfBlocks;
+  }
+
+  // Now perform splits for the power of two remainder of numberOfBlocks
+  while (powerOfTwoPortion > 1)
+  {
+    vtkm::IdComponent splitAxis = FindSplitAxis(globalSize);
+    VTKM_ASSERT(globalSize[splitAxis] > 1);
+    blocksPerAxis[splitAxis] *= 2;
+    globalSize[splitAxis] /= 2;
+    powerOfTwoPortion /= 2;
   }
+
+  return blocksPerAxis;
 }
 
 inline std::tuple ComputeBlockExtents(vtkm::Id3 globalSize,
@@ -136,16 +114,14 @@ inline std::tuple ComputeBlockExtents(vtkm::Id3
   return std::make_tuple(blockIndex, blockOrigin, blockSize);
 }
 
-// blockOrigin - global extent origin.
-// blockSize - dim of data block.
 inline vtkm::cont::DataSet CreateSubDataSet(const vtkm::cont::DataSet& ds,
                                             vtkm::Id3 blockOrigin,
                                             vtkm::Id3 blockSize,
                                             const std::string& fieldName)
 {
   vtkm::Id3 globalSize;
-  ds.GetCellSet().CastAndCall(vtkm::worklet::contourtree_augmented::GetPointDimensions(),
-                              globalSize);
+  vtkm::cont::CastAndCall(
+    ds.GetCellSet(), vtkm::worklet::contourtree_augmented::GetPointDimensions(), globalSize);
   const vtkm::Id nOutValues = blockSize[0] * blockSize[1] * blockSize[2];
 
   const auto inDataArrayHandle = ds.GetPointField(fieldName).GetData();
@@ -156,9 +132,7 @@ inline vtkm::cont::DataSet CreateSubDataSet(const vtkm::cont::DataSet& ds,
 
   vtkm::Id3 outArrIdx;
   for (outArrIdx[2] = 0; outArrIdx[2] < blockSize[2]; ++outArrIdx[2])
-  {
     for (outArrIdx[1] = 0; outArrIdx[1] < blockSize[1]; ++outArrIdx[1])
-    {
       for (outArrIdx[0] = 0; outArrIdx[0] < blockSize[0]; ++outArrIdx[0])
       {
         vtkm::Id3 inArrIdx = outArrIdx + blockOrigin;
@@ -169,34 +143,36 @@ inline vtkm::cont::DataSet CreateSubDataSet(const vtkm::cont::DataSet& ds,
         VTKM_ASSERT(outIdx >= 0 && outIdx < nOutValues);
         copyIdsPortal.Set(outIdx, inIdx);
       }
-    }
-  }
   // DEBUG: std::cout << copyIdsPortal.GetNumberOfValues() << std::endl;
 
   vtkm::cont::Field permutedField;
-  bool success = vtkm::filter::MapFieldPermutation(ds.GetPointField(fieldName), copyIdsArray, permutedField);
+  bool success =
+    vtkm::filter::MapFieldPermutation(ds.GetPointField(fieldName), copyIdsArray, permutedField);
   if (!success)
     throw vtkm::cont::ErrorBadType("Field copy failed (probably due to invalid type)");
 
   vtkm::cont::DataSetBuilderUniform dsb;
   if (globalSize[2] <= 1) // 2D Data Set
   {
-    vtkm::Id2 spacing{ 1, 1 };
-    vtkm::Id2 blockOrigin2{ blockOrigin[0], blockOrigin[1] };
     vtkm::Id2 dimensions{ blockSize[0], blockSize[1] };
-
-    vtkm::cont::DataSet dataSet = dsb.Create(dimensions, blockOrigin2, spacing);
+    vtkm::cont::DataSet dataSet = dsb.Create(dimensions);
+    vtkm::cont::CellSetStructured<2> cellSet;
+    cellSet.SetPointDimensions(dimensions);
+    cellSet.SetGlobalPointDimensions(vtkm::Id2{ globalSize[0], globalSize[1] });
+    cellSet.SetGlobalPointIndexStart(vtkm::Id2{ blockOrigin[0], blockOrigin[1] });
+    dataSet.SetCellSet(cellSet);
     dataSet.AddField(permutedField);
-
     return dataSet;
   }
   else
   {
-    vtkm::Id3 spacing{ 1, 1, 1 };
-
-    vtkm::cont::DataSet dataSet = dsb.Create(blockSize, blockOrigin, spacing);
+    vtkm::cont::DataSet dataSet = dsb.Create(blockSize);
+    vtkm::cont::CellSetStructured<3> cellSet;
+    cellSet.SetPointDimensions(blockSize);
+    cellSet.SetGlobalPointDimensions(globalSize);
+    cellSet.SetGlobalPointIndexStart(blockOrigin);
+    dataSet.SetCellSet(cellSet);
     dataSet.AddField(permutedField);
-
     return dataSet;
   }
 }
@@ -205,12 +181,12 @@ inline vtkm::cont::DataSet CreateSubDataSet(const vtkm::cont::DataSet& ds,
 // VTK-m data read code from "TestingContourTreeUniformDistributedFilter.h"
 // function: RunContourTreeDUniformDistributed
 //
-void GetPartitionedDataSet( const vtkm::cont::DataSet& ds, const std::string &fieldName, const int numberOfBlocks, 
+void GetPartitionedDataSet( const vtkm::cont::DataSet& ds, const std::string &fieldName, const int numberOfBlocks,
                             const int rank, const int numberOfRanks, vtkm::cont::PartitionedDataSet &pds )
 {
   // Get dimensions of data set
   vtkm::Id3 globalSize;
-  ds.GetCellSet().CastAndCall(vtkm::worklet::contourtree_augmented::GetPointDimensions(), globalSize);
+  vtkm::cont::CastAndCall(ds.GetCellSet(), vtkm::worklet::contourtree_augmented::GetPointDimensions(), globalSize);
 
   // Determine split
   vtkm::Id3 blocksPerAxis = ComputeNumberOfBlocksPerAxis(globalSize, numberOfBlocks);
@@ -232,30 +208,22 @@ void GetPartitionedDataSet( const vtkm::cont::DataSet& ds, const std::string &fi
   // Created partitioned (split) data set
   //vtkm::cont::PartitionedDataSet pds;
   vtkm::cont::ArrayHandle localBlockIndices;
-  vtkm::cont::ArrayHandle localBlockOrigins;
-  vtkm::cont::ArrayHandle localBlockSizes;
 
   localBlockIndices.Allocate(blocksOnThisRank);
-  localBlockOrigins.Allocate(blocksOnThisRank);
-  localBlockSizes.Allocate(blocksOnThisRank);
 
   auto localBlockIndicesPortal = localBlockIndices.WritePortal();
-  auto localBlockOriginsPortal = localBlockOrigins.WritePortal();
-  auto localBlockSizesPortal = localBlockSizes.WritePortal();
 
-  for (vtkm::Id blockNo = 0; blockNo < blocksOnThisRank; ++blockNo)
+    for (vtkm::Id blockNo = 0; blockNo < blocksOnThisRank; ++blockNo)
   {
     vtkm::Id3 blockOrigin, blockSize, blockIndex;
-
-    std::tie(blockIndex, blockOrigin, blockSize) = ComputeBlockExtents(globalSize, blocksPerAxis, startBlockNo + blockNo);
+    std::tie(blockIndex, blockOrigin, blockSize) =
+      ComputeBlockExtents(globalSize, blocksPerAxis, startBlockNo + blockNo);
     pds.AppendPartition(CreateSubDataSet(ds, blockOrigin, blockSize, fieldName));
-
-    localBlockOriginsPortal.Set(blockNo, blockOrigin);
-    localBlockSizesPortal.Set(blockNo, blockSize);
     localBlockIndicesPortal.Set(blockNo, blockIndex);
   }
 }
 
+
 #ifdef VTKM_ENABLE_MPI
   #define VDATASET vtkm::cont::PartitionedDataSet
 #else
@@ -263,7 +231,7 @@ void GetPartitionedDataSet( const vtkm::cont::DataSet& ds, const std::string &fi
 #endif
 
 //----------------------------------------------------------------------------
-bool ReadTestData(const char* filename, VDATASET &inDataSet,
+bool ReadTestData(const std::string& filename, VDATASET &inDataSet,
                   const int mpiRank, const int mpiSize)
 {
   std::ifstream inFile(filename);
@@ -322,130 +290,6 @@ bool ReadTestData(const char* filename, VDATASET &inDataSet,
 
   vtkm::cont::DataSetBuilderUniform dsb;
 
-/*
-#ifdef VTKM_ENABLE_MPI
-  int numBlocks = mpiSize;
-  int blocksPerRank = 1;
-  vtkm::cont::ArrayHandle localBlockIndices;
-  vtkm::cont::ArrayHandle localBlockOrigins;
-  vtkm::cont::ArrayHandle localBlockSizes;
-
-  localBlockIndices.Allocate(blocksPerRank);
-  localBlockOrigins.Allocate(blocksPerRank);
-  localBlockSizes.Allocate(blocksPerRank);
-
-  auto localBlockIndicesPortal = localBlockIndices.GetPortalControl();
-  auto localBlockOriginsPortal = localBlockOrigins.GetPortalControl();
-  auto localBlockSizesPortal = localBlockSizes.GetPortalControl();
-
-  {
-    vtkm::Id lastDimSize =
-      (nDims == 2) ? static_cast(dims[1]) : static_cast(dims[2]);
-    if(mpiSize > (lastDimSize / 2.))
-    {
-      if(mpiRank == 0)
-      {
-        std::cout << "Number of ranks to large for data. Use " << lastDimSize / 2
-                  << " or fewer ranks" << std::endl;
-      }
-      return( false );
-    }
-    vtkm::Id standardBlockSize = (vtkm::Id)(lastDimSize / numBlocks);
-    vtkm::Id blockSize = standardBlockSize;
-    vtkm::Id blockSliceSize =
-      nDims == 2 ? static_cast(dims[0]) : static_cast((dims[0] * dims[1]));
-    vtkm::Id blockNumValues = blockSize * blockSliceSize;
-
-    vtkm::Id startBlock = blocksPerRank * mpiRank;
-    vtkm::Id endBlock = startBlock + blocksPerRank;
-    for(vtkm::Id blockIndex = startBlock; blockIndex < endBlock; ++blockIndex)
-    {
-      vtkm::Id localBlockIndex = blockIndex - startBlock;
-      vtkm::Id blockStart = blockIndex * blockNumValues;
-      vtkm::Id blockEnd = blockStart + blockNumValues;
-      if(blockIndex < (numBlocks - 1)) // add overlap between regions
-      {
-        blockEnd += blockSliceSize;
-      }
-      else
-      {
-        blockEnd = lastDimSize * blockSliceSize;
-      }
-      vtkm::Id currBlockSize = (vtkm::Id)((blockEnd - blockStart) / blockSliceSize);
-
-      vtkm::cont::DataSet ds;
-
-      // 2D data
-      if(nDims == 2)
-      {
-        vtkm::Id2 vdims;
-        vdims[0] = static_cast(currBlockSize);
-        vdims[1] = static_cast(dims[0]);
-        vtkm::Vec origin(0, blockIndex * blockSize);
-        vtkm::Vec spacing(1, 1);
-        ds = dsb.Create(vdims, origin, spacing);
-
-        localBlockIndicesPortal.Set(localBlockIndex, vtkm::Id3(blockIndex, 0, 0));
-        localBlockOriginsPortal.Set(localBlockIndex,
-                                    vtkm::Id3((blockStart / blockSliceSize), 0, 0));
-        localBlockSizesPortal.Set(localBlockIndex,
-                                  vtkm::Id3(currBlockSize, static_cast(dims[0]), 0));
-      }
-      // 3D data
-      else
-      {
-        vtkm::Id3 vdims;
-        vdims[0] = static_cast(dims[0]);
-        vdims[1] = static_cast(dims[1]);
-        vdims[2] = static_cast(currBlockSize);
-        vtkm::Vec origin(0, 0, (blockIndex * blockSize));
-        vtkm::Vec spacing(1, 1, 1);
-        ds = dsb.Create(vdims, origin, spacing);
-
-        localBlockIndicesPortal.Set(localBlockIndex, vtkm::Id3(0, 0, blockIndex));
-        localBlockOriginsPortal.Set(localBlockIndex,
-                                    vtkm::Id3(0, 0, (blockStart / blockSliceSize)));
-        localBlockSizesPortal.Set(
-          localBlockIndex,
-          vtkm::Id3(static_cast(dims[0]), static_cast(dims[1]), currBlockSize));
-      }
-
-      std::vector subValues((values.begin() + blockStart),
-                                           (values.begin() + blockEnd));
-
-      vtkm::cont::DataSetFieldAdd dsf;
-      dsf.AddPointField(ds, "values", subValues);
-      inDataSet.AppendPartition(ds);
-    }
-  }
-
-#else // VTKM_ENABLE_MPI
-
-  {
-    // build the input dataset
-    // 2D data
-    if(nDims == 2)
-    {
-      vtkm::Id2 vdims;
-      vdims[0] = static_cast(dims[0]);
-      vdims[1] = static_cast(dims[1]);
-      inDataSet = dsb.Create(vdims);
-    }
-    // 3D data
-    else
-    {
-      vtkm::Id3 vdims;
-      vdims[0] = static_cast(dims[0]);
-      vdims[1] = static_cast(dims[1]);
-      vdims[2] = static_cast(dims[2]);
-      inDataSet = dsb.Create(vdims);
-    }
-    vtkm::cont::DataSetFieldAdd dsf;
-    dsf.AddPointField(inDataSet, "values", values);
-  }
-#endif // VTKM_ENABLE_MPI
-*/
-
 #ifdef VTKM_ENABLE_MPI
   vtkm::cont::DataSet ds;
   vtkm::cont::DataSet *pds = &ds;
@@ -472,8 +316,7 @@ bool ReadTestData(const char* filename, VDATASET &inDataSet,
       vdims[2] = static_cast(dims[2]);
       *pds = dsb.Create(vdims);
     }
-    vtkm::cont::DataSetFieldAdd dsf;
-    dsf.AddPointField(*pds, "values", values);
+    pds->AddPointField("values", values);
   }
 
 #ifdef VTKM_ENABLE_MPI
@@ -486,22 +329,7 @@ bool ReadTestData(const char* filename, VDATASET &inDataSet,
 //----------------------------------------------------------------------------
 bool GetDataSet( vtkh::DataSet &data_set, const int mpiRank, const int mpiSize )
 {
-  const char *filename = "fuel.txt";
-
-  // Write Fuel data to file.
-  std::ofstream datafile;
-  datafile.open( filename );
-  if( datafile.is_open() )
-  {
-    datafile << FUEL_DATA;
-    datafile.close();
-  }
-  else
-  {
-    std::cout << "Error writing data file: " << filename << std::endl;
-    return( false );
-  }
-
+  const std::string filename = test_data_file("fuel.txt");
   VDATASET ds;
 
   if( ReadTestData(filename, ds, mpiRank, mpiSize) == false )
@@ -566,6 +394,10 @@ TEST(vtkh_contour_tree, vtkh_contour_tree)
   // Default values if we are serial.
   int mpiSize = 1, mpiRank = 0;
 
+#ifdef VTKM_ENABLE_KOKKOS
+  vtkh::InitializeKokkos();
+#endif
+
 #ifdef VTKM_ENABLE_MPI
   MPI_Init(NULL, NULL);
 
diff --git a/src/utilities/replay/replay.cpp b/src/utilities/replay/replay.cpp
index d4a774424..fd9b9b0e6 100644
--- a/src/utilities/replay/replay.cpp
+++ b/src/utilities/replay/replay.cpp
@@ -34,9 +34,9 @@ void usage()
   std::cout<<"  --actions : a json file containing ascent actions. Default value\n";
   std::cout<<"              is 'ascent_actions.json'.\n\n";
   std::cout<<"======================== Examples =========================\n";
-  std::cout<<"./relay_ser --root=clover.cycle_000060.root\n";
-  std::cout<<"./relay_ser --root=clover.cycle_000060.root --actions=my_actions.json\n";
-  std::cout<<"srun -n 4 relay_mpi --cycles=cycles_file\n";
+  std::cout<<"./replay_ser --root=clover.cycle_000060.root\n";
+  std::cout<<"./replay_ser --root=clover.cycle_000060.root --actions=my_actions.json\n";
+  std::cout<<"srun -n 4 replay_mpi --cycles=cycles_file\n";
   std::cout<<"\n\n";
 }