I did something very similar to this, but it used a custom patch of mine
with two new functions, eval_pattern and eval_pigment.
eval_pattern(pattern, point vector) gives the value of the pattern at a
certain point, and eval_pigment(pigment stuff, point vector) gives the
color of a pigment at a point.
Also, my version was a solid block(not just the faces), so it was like
seeing a physical representation of the pattern(although the isosurface
would do better for this). This means that it took a LOT of memory. :-)

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