> Ok, but how does POV handle the situation where a ray intersects a new
> different IOR surface before "exiting" the previous? Does the ray just
> get bended more for this short overlapping portion and then back to
normal?

I think when it hits the first surface (the water surface), it accepts that
it's inside water and uses the water ior (as far as it knows, it's going to
come out of the water before it comes out of the glass). Then, when it comes
out of the glass, it recognizes that it's been in overlapping materials and
doesn't change the ior; it simply continues through the surface of the glass
and into the water.

 - Slime
 [ http://www.slimeland.com/ ]

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