Not sure if I am encountering a bug in Unreal here, but skinning of USD skelmeshes isnt working for me.
I load a usd stage which has a simple arm skeleton and geo, which is also animated.
I can validate its all working correctly in usdview (see attatched) but although the arm, and the animation is loaded into Unreal, the skinning isnt, so my geo doesnt move, apart from root transforms.
looking in the editor I can see only the root joint seems to have any skin weights, none of the other joints in the hierarchy do.
I also get the following errors suggesting unreal is not reading in the usd skinning properly, complaining about no vertex influences, but there clearly are as it works fine in other packages.
Just to add: this animated usd file works fine in Maya, houdini and usdview - its only unreal where it doesnt work.
arm.usda (68.5 KB)
[2025.01.01-13.50.10:655][170]LogUsd: Warning: TF_DIAGNOSTIC_WARNING_TYPE: For primvar attribute 'primvars:skel:jointIndices' on 'Mesh' prim </maya/l_arm> on stage with rootLayer @/DATA/GFX/3d/tests/USD/cdl/USD/maya.usd@, sessionLayer @anon:0xa3018486680:maya-session.usda@: Found 725 invalid indices into authored array of size 6 with element size of 6:
Invalid index 1 at position 1 refers to indices [6,...,11] of the authored array, which is out of bounds
Invalid index 2 at position 2 refers to indices [12,...,17] of the authored array, which is out of bounds
Invalid index 3 at position 3 refers to indices [18,...,23] of the authored array, which is out of bounds
Invalid index 4 at position 4 refers to indices [24,...,29] of the authored array, which is out of bounds
Invalid index 5 at position 5 refers to indices [30,...,35] of the authored array, which is out of bounds
[2025.01.01-13.50.10:655][170]LogUsd: Warning: TF_DIAGNOSTIC_WARNING_TYPE: For primvar attribute 'primvars:skel:jointIndices' on 'Mesh' prim </maya/l_arm> on stage with rootLayer @/DATA/GFX/3d/tests/USD/cdl/USD/maya.usd@, sessionLayer @anon:0xa3018486680:maya-session.usda@: Found 725 invalid indices into authored array of size 6 with element size of 6:
Invalid index 1 at position 1 refers to indices [6,...,11] of the authored array, which is out of bounds
Invalid index 2 at position 2 refers to indices [12,...,17] of the authored array, which is out of bounds
Invalid index 3 at position 3 refers to indices [18,...,23] of the authored array, which is out of bounds
Invalid index 4 at position 4 refers to indices [24,...,29] of the authored array, which is out of bounds
Invalid index 5 at position 5 refers to indices [30,...,35] of the authored array, which is out of bounds
[2025.01.01-13.50.10:659][170]LogLODUtilities: Warning: Warning skeletal mesh (/Game/UsdAssets/SK_maya.SK_maya) has no vertex influences
