Anton Sherwood wrote:
> 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?
> 

You mean this probably:
 >http://news.povray.org/povray.binaries.images/thread/%3Cchrishuff-484A65.16045221012001%40news.povray.org%3E/?mtop=21

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