Animation from GLB file not playing properly

[evelynparenteau]

Godot version

v4.0.1.stable.official [cacf499]

System information

macOS M1 ARM

Issue description

A GLB file with a single animation (which was created in Houdini) imports without warnings in Godot. The mesh and material loads properly and the presence of the animation is detected, but trying to play the animation results in no movement.

Steps to reproduce

1. Open attached Godot project
2. Open repro.tscn in the editor.
3. Select the AnimationPlayer node and open the Animation tab along the bottom.
4. Play the animation.

Expected result:
The cube explodes into a number of pieces. To see the expected behavior, try an online gltf viewer like this one or this one. Note in particular that this GLB file passes the Khronos GLTF validator
Note: the GLB file does not load at all in Blender, an issue I am still investigating.

Actual result:
Godot seems to think that the animation is 1 frame long (it is actually 24 frames long). As no actual movement occurs in the first frame of the animation in the file, nothing happens.

Minimal reproduction project

glb_animation_test.zip

[evelynparenteau]

As noted, the same file has trouble in Blender as well (but not in the same way - it doesn't load at all in Blender). While I suspect that this is unrelated, I have also filed a ticket for Blender.

[capnm]

Julien is right :)

See glTF Next: KhronosGroup/glTF#1036

Compare bad / ok (fixed by me):

repro2.zip

[capnm]

Bug in Blender fixed – will work in future Blender versions...