> The checker pattern uses a very nice function I made that is like the
> checker pattern, but has even gradients into the center of the squares, 
> so I was able to easily make grooves between the "tiles".

How did you do that? by putting together many single objects? or by 
using a texture? I would be interested since I need a similar effect (
for a totally different effect). Somehow I miss a constructive texturing 
in the sense of a shader in POV. I experimented using checker + a normal 
map, but this was limiting and I don't get the desired result.

ric

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