> Well, I can't say that I know what I'm talking about, but I think that
> even the slightest calculation inaccuracies would lead to big visible
> differences from pixel to pixel thus giving a very grainy look. Smooth
> variable ior would require render times that would make smooth focal
> blur seem like nothing in comparison. ...I think... :)


You're probably right, though it would depend on *how* variable the ior was.
f_noise3d scaled very small would be innacurate, but something like a
gradient scaled very large would be much more accurate.

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

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