Generate Lods option does not import models correctly

[Kalcen]

Godot version

v4.0.alpha10.official [4bbe7f0]

System information

Windows 10

Issue description

I've noticed that gltf files imported from Blender are missing all leaf bones in the scene view and in the skin weights, yet the bones are still selectable in the Skeleton3D inspector window.

This is how the animation appears in Blender:

This is how the imported animation appears in the scene:

2023-01-10.01-16-54_Trim.mp4

Steps to reproduce

Open the zipped scene, right click on test.gltf and select New Inherited Scene, play the test_anim animation in the AnimationPlayer and view the bones in the Skeleton3D inspector.

Minimal reproduction project

ArmatureImportIssue.zip

[TokageItLab]

I have explained many many times in the past whenever it has been reported that leaf bones do not show up, but it is due to the different way of defining bones in Blender and gltf, and there is no bug in the GUI and Bone animation.

The only problem here is that the skinning is missing, and I can confirm that it previews fine in the gltf viewer, so this is an issue with the godot importer.

[TokageItLab]

Upon closer look, it seems that the vertices are missing, not the Skining missing. Is it Lods problem? Is there any idea? @fire

[Zireael07]

@TokageItLab I know you've explained it many times, but is it documented? I can't see it anywhere in the Godot docs, so no wonder people keep wondering about their bones...

[TokageItLab]

@Zireael07 For leaf bone should certainly be documented. I will add pipeline documentation for blender later...

[TokageItLab]

FYI, it seems to import correctly when Generate Lods is unchecked.

[fire]

In #73734 I attempt to resolve this bug by setting a minimum of 256 triangles and also assigning every attribute into the simplification algorithm.