[Bf-usd] Geomsubset support

[Vroeijenstijn, Koen]

Hello Blender community,

I was experimenting with usd in blender today, and things are looking great. In our current workflow, we separate the geometry from the materials, as we have not committed to a way yet to describe the materials. For our current workflow, we developed a pretty good blender shader we use to import models.

I would love to keep that code path alive. At the moment, this is hard, as we use the geomsubsets to assign the materials ( and use the name of the geomsubset to look up the material to import.) Unfortunately, geomsubsets don't seem to be imported at the moment, while they would be pretty easily represented in face maps. Has there been any discussion about importing geom subsets as face maps?

Thanks,
Koen

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