228ee8f1c3
This adds the processing required to import and export simple material graphs utilizing the UsdUVTexture outputs channels. If only r, g or b are specified as output, we hook up a `Separate Color` node and connect the appropriate channel from there. (if a is specified as output, the Alpha output of an image texture node was used already) On the export side, we traverse from the socket to the image texture node, and if a `Separate Color` on the way, we are using the channel from there to put on the output. https://openusd.org/release/spec_usdpreviewsurface.html#texture-reader Pull Request: https://projects.blender.org/blender/blender/pulls/117901
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