Perhaps you refer to noise3d()? Maybe it can be used like this:

#declare Bozo = function {pigment {bozo color_map {[0 rgb 0][1 rgb 1]}}}

box {5,-5 pigment {function {Bozo(x,y,z)+noise3d(x,y,z)}}}    ? Haven't
tried it yet, I'm just asuming.

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