Quick answer: Unreal physics asset bone orientations flipped after importing from a Y-up DCC? Engine is Z-up; bone axis remapping needed - configure import.
Maya-exported physics asset; arm bones point down instead of along the limb.
Set Up axis
FBX import > Axis Conversion = Maya YUp. Bones remapped during import.
Or pre-rotate in DCC
Maya export: bake the up-axis change before export. Engine receives Z-up data.
Verify on import
Test bone with a known orientation. Mismatch = the axis config is wrong.
“Cross-DCC axis conventions differ. Import config bridges.”
If your character pipeline uses multiple DCCs, the axis convention is project policy. Document.