Warp wrote:

>   I think it would be possible to render first a non-antialiased image
> and then make a second pass shooting more rays where necessary in order to
> antialias the image.
> 
>   POV-Ray still works as it worked 10 years ago, when computers had just a
> few megabytes of memory (and thus loading a big image to memory was just
> out of question). Nowadays keeping the entire image in memory (as an option)
> would not be such a burden as it was 10 years ago and thus all kind of
> extra passes would be possible.
>   Perhaps POV-Ray 4 will change to this ideology...
> 


Some people have been rendering image (for poster printing) at big 
resolution (10000 x 10000).
That's only a need of 400 Meg of memory, just for the image (RGBA),
at only 8 bits per components.
What if they want it with 16 bits per components or even a bigger size ?

Because you have a lot of memory available is no reason to waste it
with an algorithm which scales badly.

Handling two lines of 10000 pixels is reasonnable, keeping a whole
picture in memory is not. Doing a two pass rendering (no AA, then AA) 
might be reasonnable, if you use an intermediate picture file.

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