USD Export - New Curves/Hair Support #102376
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Reference: blender/blender#102376
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Currently the USD exporter only supports the
Curvetype, which is part of the legacyOB_CURVES_LEGACYcurves system.The new
Curvestype, which is the basis of the new hair system, is currently not supported by the USD exporter.In Blender:
After USD export:
Changed status from 'Needs Triage' to: 'Confirmed'
Added subscriber: @SonnyCampbell_Unity
USD - New Curves/Hair Supportto USD Export - New Curves/Hair SupportAdded subscriber: @HooglyBoogly
Added subscriber: @lichtwerk
Added subscriber: @codeloadgame
How far is this from being merged? @SonnyCampbell_Unity
We are very interested in exporting Curves objects in usd.
@Lucas-Morante This change should be included in the next release at latest, and I have resolved the outstanding review feedback, so hopefully it should be merged relatively soon. If you have specific use cases for it I would love to get some feedback when it's available.
I have been testing with the head model above, as well as some more simple test cases, but I have been limited to best-guessing how it will be used. There could very well be cases with production quality assets that I have missed, so if you come across any issues that would be really useful feedback.
Hi, @SonnyCampbell_Unity I had some time to test it. I found a couple of things that didn't work for me. But its looking nice 👏
I'm missing st/uv on the curves. Ideally, we would have the same uvs in the curves and in the scalp geometry (geo from where the hair grows). I don't see any uvs stored in the curves - I have the uv maps option enabled on export.
the shape of the curves at the root/tip its not the same as in blender.
changing the
basis:catmullRomtobasis:bsplineworks for me but idk if there is something else going on.@Lucas-Morante thanks so much, this is really helpful for me to follow up on. Are you able to share the blend file you are using at all? That way I can replicate exactly what you are seeing and do some investigation on it?
@SonnyCampbell_Unity i was testing in this scene
https://www.blender.org/download/demo/geometry-nodes/hair_nodes-female_hair_styles.blend
Hey @Lucas-Morante I've created a PR for issue number 2 you mentioned above: #108183
This will set the correct attribute on the curve so that the curve should display correctly in usdview, and I've validated with a colleague that the output usd is correct. However I believe there is a bug in the display of usdview that doesn't correctly render the curve endpoints in this specifc case so I'm going to raise a bug on the USD github to find out if it's an issue in usdview or if there is something else that I've missed in the export. Issue here: https://github.com/PixarAnimationStudios/USD/issues/2445
I'll start looking at the UV export this week :)
I'll go ahead and close this, since I think the implementation is finished.