Perhaps if you built your own mesh to describe the surface you could apply a
color calculation to individual triangles.

Ben Chambers wrote:

> Does anyone know how I can make a texture vary depending on the
> angle from which it is viewed?  I've thought about using a radial, but that
> isn't quite what I want...  As in, the angle of incidence between the
> intersecting ray and the surface normal would act as a sort of index
> into a pigment map.
>
> ...Chambers

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