> In effect, if I'd close the rear end of
> the half-spheres, so that POV-Ray knows when it exits a particle, it might
> work better?

Yeah, that should do it. Instead of clipping them, use a difference with a
plane that has a transparent texture.

> Do you, by any chance, know exactly how deep into objects POV-Ray can
trace
> without reaching the nested-max?

No, but it shouldn't be too difficult to figure out through guess-and-check.
Or it may be in the documentation somewhere.

 - Slime
 [ http://www.slimeland.com/ ]

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