>   If you are unsure, test triangles in CSG to see if you can find their
> "inside", as with the disc.

I did a quick scene which just placed hundreds of objects behind each other.
It seems like there is no "true" 2D-Object, even triangles add up to
nesting. So I guess the only working method would be to take a sphere,
squish it real hard to make it near disc-like, and place those as particles.
POV-Ray would know when it enters and exits a sphere and for the general
usage, it would hardly be possible to have enough of such thin particles to
nest inside each other to reach the limit.

Anyways, thanks for the insight and help, much appreciated!

-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>

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