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Q:
What is the difference between the ShaderUV attribute (kQ3AttributeTypeShaderUV) and
the SurfaceUV attribute (kQ3AttributeTypeSurfaceUV)?
A:
The ShaderUV attribute is the attribute type for the "official" UVs that are intended for texture shading.
The SurfaceUV attribute is the attribute type for "geometry-related" UVs such as knot-placement on NURBs, trimming
curves, etc. In practice, however, the SurfaceUV attribute is commonly used also for texture shading.
In other words, you can use either one for texture shading.
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