I've been digging about in the docs for a while and can't come up with 
an obvious way to achieve this, although I'm sure it must be fairly 
straightforward.

Suppose I have a mathematical formula to calculate the R, G and B values 
of a pigment based on the coordinates (x,y,z), how to write that in POV?

I started by writing 3 functions to calculate the R G and B components, 
but then I got stuck trying to combine them in the pigment part of an 
object. What's the best way to do this?

I want to write this:

pigment{color rgb <functionR,functionG,functionB>}

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