[pier25]

But how is a texture/material generator related to a scene description standard?

[pixelesque]

Users will want to load USD scenes/models into Adobe products.

Also, USD supports USDShade and MaterialX material (shader network) definitions, and I imagine there will be full round-tripping support for that?

[franzb]

Adobe makes many 3D tools that are able to import and export USD files. For instance, you could import a USD scene into Substance Painter, paint some objects and export it again in a lossless manner.