I added another small enhancement which allows the end of the portal to 
be transformed from within the portal_pigment {} statement, and made a 
pigment_map of two portal pigments to get this image. I animated a 
slightly different version with the portal shifting from the chrome 
sphere world to the purple world, the animation is available here 
(again, as a QuickTime Movie):
http://homepage.mac.com/chrishuff/pov/ShiftingPortal.mov
There are three "worlds", each one is actually a union of it's objects 
and light sources and a 1000-unit-radius sphere for the sky, I then 
translate each world far enough that it is outside the spheres of the 
other worlds. This technique lets me set up each individual world 
centered around the origin and could be combined with declared 
transformations to make managing the separate worlds quite easy. The 
only restriction with this technique is that you can't use shadowless 
lights, because they will affect objects in other worlds.

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

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