Wasn't it Bernd Fuhrmann who wrote:
>Hi!
>
>I'd like to do something like this:

You could use texture layering:

#declare texture3 =
texture {pigment {function {f_r(x,y,z)} color_map {[0 rgb 0][1 rgb x]}}}
texture {pigment {function {f_g(x,y,z)} color_map {[0 rgbt 1][1 rgb y]}}}
texture {pigment {function {f_b(x,y,z)} color_map {[0 rgbt 1][1 rgb z]}}}

-- 
Mike Williams
Gentleman of Leisure

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