> Sounds mostly like the camera_view pigment to me:

Would it be possible to have such a portal (A patch of Chris Huff called 
it like this IIRC) working in both directions? Following example:

A scene with just a plane in it, and on the plane stands a door frame. 
Through the door you can see a room, but it's clear that the door must 
be a portal, because you can see that the room itself is not on the 
plane. Up to this it could be done with the camera_pigment. But imagine 
I want a light_source in the room to shine light on the plane, or an 
object in the room to reflect the plane - this would not work currently, 
right? One would need a surface which teleports incoming rays, depending 
on which side of the surface they hit.

Would this be possible? And would it be worth the effort?


Florian

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