In article <385c20b8@news.povray.org>, "Ed Kaiser" 
<eka### [at] camdentdsnet> wrote:

> ...and how do you add it to and equation like x^2+y^2+z^2-1 ?

Just add it in.
Do something like this:
#declare MyPigmentFunction =
function {
    pigment {agate
        color_map {[0 color Black][1 color White]}
    }
}

isosurface {
    function {x^2+y^2+z^2 - 1 + 
        MyPigmentFunction(x, y, z)*0.5
    }
    threshold 0
    ...
}

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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