VTK Widget for DearImGUI

• An effort to incorporate VTK's dataset visualization capabilities with versatility of DearImGUI
• Renders VTK content into a viewport within an ImGui Window
• Look in main.cpp for details on example usage

Changes vs. trlsmax/imgui-vtk

• imgui_impl_vtk files are now deprecated in favor of using VtkViewer objects
• Uses VTK OpenGLRenderWindow's framebuffer directly
• Fixes/upgrades IO behavior
• Uses ImGui's docking branch (but doesn't depend on it; you can certainly avoid/revert this if desired)
• Includes imgui, gl3w, and glfw directly as git submodules in this repository
• Builds components separately in CMakeLists.txt and links them as static libraries
  • CMakeLists-alt.txt is more similar to the old CMakeLists.txt, building everything together from source
• Supports multiple independent VtkViewer instances/windows
• Usage (see main.cpp for details)
  • Previous: ImGui window was created for you
  • Current: You must create (and end) ImGui windows yourself
    • This allows you to place other widgets in same window as VTK "viewport" and control all aspects of the ImGui Window yourself
• Note: For the sake of cleanliness and readability, most preprocessor directives were removed. Files no longer auto-detect your OpenGL loader. While everything is currently set up for OpenGL3 + GLFW + GL3W, you may need to adjust #include statements, etc. to match your use case.

Usage:

• CMake
  1. Build separately & link
  • Build your executable, imgui, your OpenGL Loader (e.g., gl3w), and imgui-vtk. Make sure to link imgui-vtk against imgui, your OpenGL Loader (e.g., gl3w), and VTK!
  • See CMakeLists.txt for more details
  2. Build together
  • Build your executable, imgui, your OpenGL Loader (e.g., gl3w), and imgui-vtk all together, from source.
  • See CMakeLists-alt.txt for more details
• See main.cpp

dataset = ..
filter = ..
mapper1 = ..
mapper2 = ..
actor1 = ..
actor2 = ..
filter->SetInputData(dataset);

mapper1->SetInputConnection(filter->GetOutputPort(0));
mapper2->SetInputConnection(filter->GetOutputPort(1));
...

actor1->SetMapper(mapper1);
actor2->SetMapper(mapper2);
...

ImguiInit...

VtkViewer myVtkViewer;               // create VTKViewer object
myVtkViewer.addActor(myActor);       // give it an actor

while (!terminate)
{
  Imgui new frame..
  custom imgui windows..

  // VTK Viewer Window
  ImGui::Begin("My VTK Viewer");
  myVtkViewer.render();              // render VtkViewer within window
  ImGui::End();

  ImGui::Render();
  ImGui_Impl_xxx_RenderDrawData();
}