"Greg M. Johnson" wrote:

> I had delusions  of grandeur of being able to tweak existing code and
> make some really cool new object...   An isosurface?--hmm, thanks will
> try that instead...

Superellipsoids are nicely done by isosurfaces. Below is some code for an
icecube. Works great with photon mapping.

G.

#declare IceTxt=material{
 texture { pigment { rgbt<189/255,194/255,197/255,1>}  finish { ambient 0
specular 1 roughness 0.0001 reflection 0.1}
 }
 interior{
        ior 1.309
        fade_power 2 fade_distance 2.5
        media {
                        emission col2*0.3
                        method 2
                        density{boxed turbulence 1 color_map{[0 Black][1
White*2]}}
                        scale 0.7
         }
 }
}
#declare e=0.05;
#declare n=0.05;
#declare IceCube=isosurface {
 function {( abs(x)^(2/e)+abs(y)^(2/e))^(e/n)+abs(z)^(2/n)-1 +
1.2*noise3d(x*1.22,y*1.2,z*1.2)}
 contained_by { box { -1, 1 } }
 threshold 0
 method 2  max_gradient 14
 hollow
 material{IceTxt}
}


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