Yes, it should definitely be put in texture, otherwise we couldn't have
layered textures using this feature! It shouldn't go in pigment, because
it can have a pigment, and that might get messy. Maybe finish...

Anyway, I a pattern would be used for the parameters(a normal POV-Ray
pattern gives a value from 0-1 depending on location, and other ranges
could be used with the isosurface functions.) If an effect requires more
than one value, just allow more than one pattern-parameter. This is the
reason for my suggestion of a "solid" pattern, which takes a float
argument which is the return value of the pattern.
(I think this method would be useful for a couple other things as well,
reflection is one of them.)

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