I'm certain this has been asked before, but I can't seem to find it (or 
figure it out from the docs).

All of my user defined functions return a float value.  How can I write 
a function that returns a 3d vector?

The context is simply a pigment block.  What I want is something like this:

#declare f1=...
#declare f2=...
#declare f3=...
pigment {color rgb <f1(x,y,z), f2(x,y,z), f3(x,y,z)>]

Of course, I'd be happy declaring only 1 function if it allowed me this 
functionality (no pun intended!).

...Chambers

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