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It depends on what you're trying to emulate. If you want anti-aliasing simply to
make it look like you started with a higher res image and reduced it, then the
way pov does it is fine. But if you want it to simulate photography then it
should combine all it's samples before clipping them. You could avoid
over-bright objects getting jagged edges by using more samples (the
anti-aliasing threshold would mean these extra samples only got used on those
high-contrast areas).
--
Tek
www.evilsuperbrain.com
"Slime" <fak### [at] email address> wrote in message news:40034b23$1@news.povray.org...
> > Unfortunately, POV clips the colors before it combines them, rather than
> > afterward...to antialiasing, rgb 20 is the same as rgb 1.
>
> You mean fortunately. POV-Ray does this in the mathematically correct way.
> Antialiasing is a method of making an image with finite resolution appear as
> though it has infinite resolution. If POV-Ray did not do it this way, then
> extremly bright objects which are *large* (such as a sphere with color rgb
> 20) would look very aliased.
>
> Clipping after anti-aliasing would cause anti-aliasing to be useful only in
> situations where colors were not oversaturated. Just because the alternative
> would produce a specific effect in a specific situation doesn't mean that
> it's desirable.
>
> - Slime
> [ http://www.slimeland.com/ ]
>
>
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