Can anyone explain why crackle is so slow
when used as a pigment function in isosurfaces.
The following isosurface renders at 8 pps.

Any suggestions on speeding this up? I tried rendering a crackle
pigmented plane and using it as an image_map in an isosurface,
but it was just as slow

#declare Crackle2=
 function {pigment {crackle solid}}

isosurface {
 function {y - Crackle2(x*3,0,z*3)*0.4}
 threshold 0
 method 2
 eval
 contained_by {box {<-8,-1,-8>,<8,3,8>}}
 pigment {rgb 1}
}

Thanks
Gail
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