Texture atlas not working when exporting to USD

[SleepiDreamer]

I can export an OBJ file with a texture atlas (mosaic images). However, that doesn't seem to be supported when exporting to USD.
I need USD for its PBR capabilities, but only the albedo is exported, without any of the PBR textures.

The reason I can't just export them as individual materials is that my glTF path tracer (which I want to generate a model for) has significant performance penalties when there's so many small BLASes from each unique material.

Is this a bug, or just not a supported feature?

[erich666]

Hmm, yeah, interesting case - I entirely forget if this was a conscious decision or just a test case I forgot about. PDF textures will indeed export only when exporting individual textures. I'll look into it, but right now, you're right: PBR for individual texture export only.

[erich666]

I haven't forgotten this one, but have been busy with adding (most of) 1.21.9 content, all the copper geegaws, and with fixing a bunch of other bugs. That's done, the 12.10 release. I'll try to look at the issue you raise soon.