USD: Correctly write out and read Mesh velocity data #120771
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Michael Kowalski
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Reference: blender/blender#120771
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Delete Branch "deadpin/blender:usd-duplicatevel"
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During Export, we were accidentally duplicating the
velocityattributedata. Once inside the
write_surface_velocityfunction (which wascorrect) and again while writing out all "custom" attributes inside
write_custom_data(which was incorrect). Fixed by excluding the"velocity" attribute inside
write_custom_data.During Import, we were only loading back in those "custom" primvars so
things happened to work, by accident, but only for USD files produced by
Blender. Now we import just the Velocities attribute which should work
with all files.
This should fully address #96182
@blender-bot build
@deadpin Regarding the existing code for normals, please see the specification for meshes, in the section A Note About Normals
https://openusd.org/release/api/class_usd_geom_mesh.html#details
which states
@makowalski That's interesting, thanks! In this case I guess the check is more for backward compatibility with any USD file produced by blender prior to this change.
I'll leave a comment saying so. Do you think I should flip the order and prefer the real Velocities data first?
I don't see any guideline about this one way or the other. The way you have it now is good, in my opinion.
The changes look good! Thanks for the fix!
@blender-bot build