Add animations

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Here is my proposition for animation support in f3d.

1. Implement a standard temporal pipeline in vtkF3DGenericImporter to be able to recover the number of time steps and set a requested time step

2. Add a vtkImporter::GetNumberOfTimeSteps and vtkImporter::SetCurrentTimeStep

3. implement vtkGLTFImporter version (may be complex?)

4. implement vtkF3DGenericImporter version

5. implement a F3DAnimator that is initialized using the Viewer and the Loader

6. in the main, use the Animator if needed, or the viewer instead

Caveats :

• Need changes to VTK, before VTK9
• While the Animator is in it's render loop, f3d may be hardly usable
• There is no way to ensure realtime animation if present in the data
• Multi animation format are not supported (gltf)

Did you already use vtkAnimationScene @mwestphal ? Looks promising.

Not sure what we should do with it. Animation scene is to make stuff parameters change over time, is it not ?

you must be right, I'm a bit confused about what this class is used for.

Do you plan to support only mapper animation mode ?

All the "transform based animation" code for GLTF is in the reader, do we need to generalize it as well ?

Let's discuss it in the next meeting

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Implemented by !177 (merged)

closed