> Is it possible to automatically know when a scene is good enough? Or
> does it take human intervention to say "ok, stop now and move on to the
> next frame"?
>
On the only forwards-raytracer I have ever used (WinOSi), the rendering
algorithm is two passes inside an infinite loop. You stop it when you
want to. You can also render for a while on different computers, and
*merge* the results.
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