scott wrote:

> I had thought of doing such a thing but I don't know in my code how 
> large the return values of the function will be (certainly not limited 
> to 1). 

I think there is no elegant way to solve this except for your scaling.
But defining functions without known limit for use as RGB pigment would
seem to be a problematic approach to begin with ... even without the
technicality of turning a function into a pigment you need to decide
on a scaling if the function is not 0 to 1 (or worse, unbounded).

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