Bezier

ROS-Industrial Special Project: 6D tool path planner

Pierre Étienne Bézier September 1, 1910 – November 25, 1999; was a French engineer and one of the founders of the fields of solid, geometric and physical modeling as well as in the field of representing curves, especially in CAD/CAM systems. As an engineer at Renault, he became a leader in the transformation of design and manufacturing, through mathematics and computing tools, into computer-aided design and three-dimensional modeling. Bézier patented and popularized, but did not invent the Bézier curves and Bézier surfaces that are now used in most computer-aided design and computer graphics systems.

Travis CI

General information

This project has been developed by the Institut Maupertuis, a French research institute that is working on robotic industrial processes. This project goal is to create an automatic grinding path generator for 6-axis robots working on diverse/random meshes.

Bezier planner generates robot poses (3D trajectories) in harmony with a grinding process. It is able to create rectilinear trajectories on complicated surfaces (3D surfaces) and to dilate them in all directions in order to grind defects with a pass principle.

Directories in the project

Directory	Description
bezier	Meta-package
bezier_application	Example usage of the bezier_library for grinding operations on a Fanuc R-1000iA robot
bezier_library	Library containing several path planning algorithms

Dependencies

• Robot Operating System
• industrial-core
• fanuc
• rviz_visual_tools
• Visualization Toolkit version 7.0 or later
• Point Cloud Library version 1.8.0 or later. ⚠️ PCL has to be compiled against the same VTK version that is used for this package
• Rviz Visual Tools
• C++11 is required

This package has been tested with Ubuntu 14.04 and ROS Indigo.

Documentation

In bezier_library folder, there is some classes which needed to be explain:

• bezier_library.cpp, abstract class, documented here
• bezier_grinding_surfacing.cpp, which inherits from bezier_library.cpp, documented here

Quick help

Build using wstool and catkin_tools

Install wstool in order manage the repos inside the workspace

sudo apt-get install python-wstool

mkdir catkin_workspace
mkdir -p catkin_workspace/src
cd catkin_workspace/src

wstool init .
wstool merge https://github.com/ros-industrial-consortium/bezier/raw/indigo-devel/bezier.rosinstall
wstool update
rosdep install --from-paths . --ignore-src
cd ..
catkin build

If you have troubles with rviz_visual_tools not finding Eigen, please revert this commit rviz_visual_tools/commit/425d208b2719cafeae3e4f3ccdd6b44853400a32 in the rviz_visual_tools clone.

Launch

Source the devel/setup.bash file and launch:

roslaunch bezier_application fanuc_m20ia.launch surfacing_mode:=true mesh_cad:=plane/plane_defect.ply

In this example, bezier_application will be launched with plane_defect.ply as the CAD mesh and the grinding will be done in surface mode, meaning that we only pass on the surface of the mesh to smooth it.

roslaunch bezier_application fanuc_m20ia.launch mesh_cad:=plane/plane.ply mesh_defect:=plane/plane_defect.ply

In this example, bezier_application will be launched with plane.ply as the CAD mesh and plane_defect.ply as defect mesh.

Others examples of meshes are available in:

$(catkin_workspace)/src/bezier/bezier_application/meshes