USD: skip exporting deform group attributes #111894
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Reference: blender/blender#111894
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Delete Branch "makowalski/blender:usd_no_defgroup_attr_export"
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No longer exporting mesh attributes that correspond to deform
groups.
This is to avoid potential name collisions when importing the
USD back into Blender, as described in #111747.
This preemptively addresses an issue which will arise when
exporting armatures to USD is supported, because the deform group
attributes and the UsdSkel mesh skinning data will be redundant.
In the future we might consider refining this behavior with a USD
export option to allow exporting some vertex group attributes but
not others.
Testing
To test, export a Blender scene containing a mesh with an armature
modifier to USD and verify that there are no
primvars
correspondingto the deform groups on the USD mesh. For example, export test scene
tests/animation/CtrlObject.blend
to USDA, open the exported file in a texteditor and verify that attributes
Top
,Left
andRight
are not be saved asprimvars
on the mesh.@blender-bot build
Michael Kowalski referenced this pull request2023-09-04 18:19:11 +02:00
USD: skip exporting deform group attributes.to USD: skip exporting deform group attributes@ -103,6 +104,10 @@ void USDGenericMeshWriter::write_custom_data(const Mesh *mesh, pxr::UsdGeomMesh
return true;
}
if (BKE_id_defgroup_name_find(&mesh->id, attribute_id.name().data(), nullptr, nullptr)) {
Would be nice to reference something like the function name that gives the reader somewhere to look for where vertex groups are handled separately.
Shouldn't the skipping of exporting vgroups as generic attributes be conditioned to the fact they they are actually exported as part of binding data for a usdSkel?
That's a good point and occurred to me as well, though I was a little unsure if we wanted to postpone supporting IO of vertex group attributes at the moment.
I could change the implementation to selectively remove conflicting attributes when the
UsdSkel
bindings are created. It In that case, this should probably be part of theUsdSkel
export pull request #111931, since main doesn't currently export theUsdSkel
bindings at all.Does this sound reasonable?
Sounds good, but I think it would be better to not export the vertex group attributes that would be redundant in the first place. I guess that requires some communication between the
UsdSkel
export and attribute export. Delaying this PR until #111931 lands seems like the right approach.That also sounds okay to me. Reasonable since Blender is still resolving this difference between vertex group storage and attribute storage itself. But like I mentioned before, then we would just have the problem again when the storage is unified, so doing it preemptively like you mentioned above seems better to me.
yes also sounds good to me.
Checkout
From your project repository, check out a new branch and test the changes.