Warp wrote:
>   Radiosity requires lots of sampling, but the results can be spectacular.
> Media also requires lots of sampling, but the results can also be quite
> spectacular. Variable IOR would probably require even more sampling, yet
> I highly doubt the end result will look any spectacular.

This is probably the best argument against it I've heard.  I'm sure 
someone will eventually write a patch to do it, and we'll see at that 
point whether your argument is justified.

Personally, I think that if used well, it could aid in realism the same 
way that radiosity, focal blur, et al can - that is, when the viewer 
doesn't realize that the effect is there, that's when it has the 
greatest benefit.

...Chambers

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