USD Export don´t export Vertex Colors ( Color Attributes ) #99211
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Reference: blender/blender#99211
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System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 516.40
Blender Version
Broken: version: 3.2.0, branch: master, commit date: 2022-06-08 10:22, hash:
e05e1e3691Worked: Not known
Short description of error
USD Exporter don´t export Vertex Colors ( Color Attributes )
Exact steps for others to reproduce the error
Just paint some VC on the default cube with Vextex Paint Mode, then try to export the cube.
Exporter don´t have the "Color Attributes" checkbox ( Importer has it )
You can then try to reimport the USD file and check that your VC aren´t there.CUBE.blend
Added subscriber: @JVM
Added subscriber: @KevinCurry_Unity
Changed status from 'Needs Triage' to: 'Confirmed'
I can replicate this issue in Blender latest.
Added subscribers: @makowalski, @lichtwerk
Changed status from 'Confirmed' to: 'Needs Developer To Reproduce'
This is just not implemented afaict.
@makowalski : do you want to keep this as TODO?
This is already implemented in the
universal-scene-descriptionbranch, so it's just a matter of patching that code intomaster. I will take this task.Just tested on the last Alembic exporter and found the same problem here, should i rise a separate bug report i guess? @makowalski ?
Added subscriber: @kevindietrich
@JVM Yes, I would suggest a separate bug report for Alembic, since the work would need to be split up to different tasks for the Alembic/USD exporters. I will certainly coordinate with @kevindietrich (who is handling the Alembic exporter) to make sure we are in alignment on the approach to solve this.
Thanks for the info @makowalski , i´ll do it tomorrow then
@makowalski @kevindietrich task for the Albembic bug is created here : https:*developer.blender.org/T99293
@makowalski Where i can test USD last changes? i only found a a month old build here for the USD branch : https:*builder.blender.org/download/experimental/archive/
Hi @JVM Support for exporting color attributes is available in that USD branch build from June 15 (
1d5d49775c). You should see aVertex Colorscheckbox (enabled by default) underMesh Optionsin the USD export dialog. This should allow you to test color attribute IO, but please let me know if you run into any issues. (BTW, I'll be renaming that optionColor Attributessoon, to match the new naming convention.)So its only on that branch, which it´s based on 3.2.0 alpha right?
Only problem i see is that we´re currently working on 3.2.1, and it´s not suitable to mantain a diferent blender version only for the export...
The USD branch will be merged on 3.3 then?
I will be creating a patch including the color attribute IO from the USD branch for review, but I haven't done so yet. I don't have an exact timeline for this right now, because there are several other bug fixes and patches currently in progress, but this won't be in time for the 3.3 release.
Added subscriber: @codeloadgame
Added subscriber: @dagnode
I tried exporting Vertex Colors using 3 versions of Blender. The Mac Silicon versions didn't work for me.
Repro using a Plane w/ vertex colors.
Thanks for pointing this out, @dagnode. This was previously working, so I'll do some testing to determine what might have changed.
Hi @dagnode So I just tested the latest (October 18) experimental build of the
universal-scene-descriptionbranch for Windows, available here:https://builder.blender.org/download/experimental/
It seemed to successfully export the
primvars:Colfrom the CUBE.blend file you provided. I was also able to import theColattribute from the saved USDA. Please note that this currently only handles attributes of typeCD_PROP_BYTE_COLOR.Unfortunately, I'm unable to test for Mac at the moment. Were you exporting using the latest build from October 18? If you're still having the issue, I'll try to arrange for additional testing on Mac.
Hey @makowalski -- sorry for the false alarm. I tested again (and using the October 18 build) on Linux and Mac and it worked fine. It looks like it may have been a problem with the blend file I was using and not the software version. When I copied my blend file to Linux, it also did not export vertex colors (even though they show up in the viewport and the mesh details UI). I'll see if there are any repro steps and, if so, file a separate ticket. Thanks for you great work on USD support in Blender!
Thanks for the update, @dagnode. Yes, please keep us posted of any additional issues. BTW, patch D16108, currently under review, will add the color export functionality to the master branch, with some additional improvements (e.g., handling float colors).