Improvements to color space handling

AcademySoftwareFoundation / MaterialX

MaterialX is an open standard for the exchange of rich material and look-development content across applications and renderers.

http://www.materialx.org/

Apache License 2.0

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Closed jstone-lucasfilm closed 1 week ago

jstone-lucasfilm commented 1 week ago

Add support for 'none' as a colorspace attribute, specifying that the given color should not be transformed.
Add support for colorspace attributes on multi-output nodes (e.g. UsdUvTexture), which only affect color-typed outputs.
Update the 'usd_normal_map.mtlx' and 'usd_uv_texture.mtlx' examples to demonstrate these new capabilities.
Remove legacy references to colorspace 'none' for physical colors, as it's more accurate in practice to interpret these values as visible colors.