I recently made an animation with a portal in it. You can see it on this
page:

http://runevision.com/3d/anims/

Since all other techniques I know of have problems, typically with shadows,
I decided to use an image_map for the portal and have the image in the
image_map be generated by a different scene (but where the camera is
synchronized in both scenes). Well, it was not a regular image_map I used,
but rather one generated by my Illusion Include File which can be found on
this page:
http://runevision.com/3d/include/

Rune
-- 
3D images and anims, include files, tutorials and more:
rune|vision:  http://runevision.com
POV-Ray Ring: http://webring.povray.co.uk

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