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In article <39C0E9D3.C9E82E0F@insectes.net>, Libellule
<lib### [at] insectes net> 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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> You're image is nice, but kind of hard to see. It's because of the
> reflections/refractions of the floor.
Yeah, I don't know why they're showing up at the top half of the sphere, it
looks rather strange
> The pattern is quite nice. If you render it in a clear pigment with slight
> blue and white tint, it could look like ice.
Maybe I'll try that :o)
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> It might just be the ordinary inaccuracies in the solving algorithm. You
This sounds reasonable, I tried making two identical halves next to each
other, and though they looked very similar, they were visibly not the same.
Maybe I could just decrease the accuracy value (to increase the accuracy ;)
I'll try your sign -1 suggestion as well
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