3bc31497@news.povray.org...
> But I mostly get a black result. The form is only recognizeable if I use 5
> or 6 steps istead of 255.. What's wrong, and are there more clever ways?

Why not just use a simple gradient ? Something like this (untested, but
that's the idea) :
#declare BMin=...
#declare BMax=...
isosurface{
    function{...}
    contained_by{box{BMin,BMax}}
    pigment{
        gradient y
        scale BMax.y-BMin.y
        translate BMin.y*y
    }
}

G.
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