Christoph Hormann wrote:
> I don't know that much about Renderman - do you mean surface curvature? 
>  I guess this would only be possible numerically for most shapes.
> 
Yes, basically it means using surface curvature (change of intersection 
point and its normal with respect to u/v changes) in shader 
calculations. Mostly it is used to filter texture (i.e. perform 
antialiasing), but u/v information could be used also for texture 
definition (i.e. texture will be calculated from u/v information).
I intended to add this support for most used shapes (quadrics, 
triangles/meshes) for which u/v mapping and curvature could be easily 
defined/calculated. POV-Ray has uv-mapping defined for some of such 
shapes, for others it just returns xy coordinates of intersection as uv 
vector. (shader could remap this according to shader parameters so user 
can customize it according to needs).

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