Generated GLB contains cyclic skeleton

[TerryLiu007]

Problem

AniGen can generate a GLB with a cyclic skeleton hierarchy. This invalid skeleton can make
Blender hang during import.

Input image

Suspected Cause

repair_skeleton_parents may contain a bug or incomplete validation. It should prevent cases where:

• a joint is its own parent
• parent links create a cycle
• the final exported skeleton hierarchy is not a valid tree/DAG

[TerryLiu007]

mesh_hang.glb.zip