Importing a GLTF mesh with joint indices encoded as VEC4 results in an error #65
Description
Many applications (incl Blender) write GLTF joint indices as VEC4 but the readAccessorInts function used to read joint indices expects them to be encoded as SCALAR, which results in the following warning (and results in the joint indices not being read, and coming through to the USD stage as all zeroes):
Warning: in readAccessorInts at line 869 of USD-Fileformat-plugins\gltf\src\gltf.cpp -- Accessor 2 used as indices has invalid type 4 (expected SCALAR type 65). Rejecting to prevent type confusion attack.
Repro Steps
- Download the SimpleSkin GLTF example from: https://github.com/KhronosGroup/glTF-Sample-Models/tree/main/2.0/SimpleSkin/glTF
- Attempt to use the plug-in to read
SimpleSkin.gltfinto usdview - Notice the above error is printed to the terminal
- Also notice that the resultant joint indices come through as zero in usdview:
