> B) Writing the renderer so that a texture can be based on the camera 
> view (with rays being traced, anti-aliased, usw...) of another place in 
> the scene.

There have been a POV-Ray patch which allowed to do that, you could have
a "portal" object (which, when, who, and what is out of my memory).

So I guess it's not so hard to do.

Fabien.

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