Chris Huff wrote:
> 
> I briefly considered this exact feature, but there is no way I could do
> it.

Couldn't it be done as an extension of the light_groups philosophy? E.g. if the
the camera ray hits an object that is not in the camera's "world group" the
intersection is discarded; a portal would (among other things) redefine the
camera's group id, so further testing along this ray is done for a different
"world group".

-- 
Margus Ramst

Personal e-mail: mar### [at] peakeduee
TAG (Team Assistance Group) e-mail: mar### [at] tagpovrayorg
Home page http://www.hot.ee/margusrt

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