Slime wrote:
>>
http://www.students.tut.fi/~warp/povQandT/languageQandT.html#variableior
>
> You know, it's not really impossible. It would just
> require some sort of approximated integration,
> Euler's method at the least.

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... :)

Rune
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