>> 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?
...
 >
> #macro fnColor(thisPoint)
>    rgb <fnR(thisPoint.x),fnR(thisPoint.z),fnR(thisPoint.z)>
> #end
>
> pigment{color fnColor(<a,b,c>) }

That won't work for me, as the RGB values depend on the coordinates of 
the object the pigment is applied to (so it's not a constant colour). 
I'm using the method waggy suggested, but modified to cope with large 
values. I just wondered if there was a neater way to specify this, 
that's all.

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