So, I have been working with functions and patterns for a while now, and 
aside from not having vector functions to easily create color values 
with, I have run into an issue with the way POV-Ray maps things - 
colors, pigments, textures.

Since I haven't experimented extensively with these mapping mechanisms 
or gone through the source code to see exactly how they are handled, I 
as far as I know, they only handle values in the range from zero to one.

I'm interested in knowing if anyone has done any work that contradicts 
this notion, or to hear how I might use negative numbers, large numbers, 
or ways to get around the auto-wrapping-around of the color map.  I'd 
like to subtract part of one color channel from the overall result of an 
average {} pigment using a negative value, or saturate the color (to 
white) by allowing large values.

Any data would be helpful.

Thanks!

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