In article <399EE07F.65720247@pobox.com>, Anton Sherwood 
<bro### [at] poboxcom> wrote:

> Why does this show nothing?

You don't specify a threshold, so it defaults to 0. Your function only 
evaluates to 0 at a few points(if it ever does), so surfaces are found. 
Try using a threshold of 0.5 for some results.

isosurface {
    function {sqr(x) + sqr(y) + sqr(z) - PigFun(x,y,z)}
    threshold 0.5
    contained_by {sphere {0, 2}}
    pigment {rgb 1}
}

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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