Can a portal object be infinite?  If so, portals can be used to vary the
effective topology of space.  Simple example: place two pairs of
parallel portal-planes to make the `torus' field of many games.

I've long wanted to try pseudo-hyperbolic space, where (for example)
five plane-quadrants meet at a point.  Such an illusion would be
improved, i think, if the portal had an optional `refraction' setting.

-- 
Anton Sherwood  --  br0### [at] p0b0xcom  --  http://ogre.nu/

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