Technical Q&A's

QD3D 52 - ShaderUV/SurfaceUV Attribute Differences (11-July-97)

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.

-- Scott Kuechle
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