In article <39C0E9D3.C9E82E0F@insectes.net>, Libellule 
<lib### [at] insectesnet> wrote:

> I tried differencing that from another sphere to get the other half 
> (and also scaling that sphere by 0.999 to not have coincident 
> surface), but it seems the isosurface is randomized somewhat at each 
> call (I guess this is because the isosurface has agate in it?) 

It might just be the ordinary inaccuracies in the solving algorithm. You 
might try differencing a thinner, sheet-like isosurface from a single 
sphere instead. Or making a hollow isosurface like a single, infinitely 
thin sheet, and clipping it to fit inside the sphere(kind of a "false 
surface" inside the sphere). This last one couldn't simulate a gaping 
crack, but it might be useful for hairline cracks in glass.

Hmm, did you say you differenced the difference of a sphere and 
isosurface from another sphere? Try just making another difference of 
the sphere with the same isosurface(using "sign -1" to flip the "inside" 
of the isosurface to the other side) instead...and separate the halves 
by a small amount to avoid coincident surface problems, of course.

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

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