I know someone wrote an extension to allow a plane to transfer rays to 
another plane, so that you can make (for example) two windows side by 
side that overlook different places.  I think it was called "portal 
pigment" but I find no mention of it more recent than 2001.  Help?

I need it to complete a series for 
http://en.wikipedia.org/wiki/Andreini_tessellation -- I made most of the 
images there, with mirrors, and that's not possible for some of the 
lattices on the list.

-- 
Anton Sherwood, http://www.ogre.nu/
"How'd ya like to climb this high *without* no mountain?" --Porky Pine

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