GLTF animation issue with specific file

[mwestphal]

trafficstars

Describe the bug Certain GLTF files do not animate correctly

To Reproduce Steps to reproduce the behavior: 0. Horse.glb.zip

1. Open the file using f3d --dry-run horse.glb
2. Press space
3. Animation is incorrect

Expected behavior Animation should looks correct (check in https://gltf-viewer.donmccurdy.com/)

System Information:

• OS: linux and windows

F3D Information Paste the content of f3d --version: master and 1.3.1

Notes

using --geometry-only is a workaround

[mwestphal]

@Meakk Other animation works without issue, I think this is another type of animation which is not supported correctly.

Strangley the vtkGLTFReader does not have this issue.

[mwestphal]

@Meakk I think this one is in VTK but investigation is needed to be sure. Do you think it matters for the next release ?

Other animations seems to work. I found a few files failing like this one, mostly "simple" animation.

[mwestphal]

@Meakk

[Meakk]

Looks like the mesh is duplicated for every frame, but I don't see any temporal information in the GLTF file...