Peter J. Holzer <hjp### [at] sikituwsracat> wrote:
: This is also not true. After you have rendered the whole frame without
: AA, you can "refine" only those pixels which differ more than some
: threshold from their neighbours.

  You are right. This, however, needs that the info of the whole image is
kept in memory for the final antialiasing pass.
  Not an impossible solution, though.

:>  Yes, but if there are no nearby pixels,

: Every pixel has at least 3 nearby pixels.

... which are yet to be calculated when we are in an earlier step of a
progressive render.

: True. You would need a file format which lets you determine exactly
: where you left off. For example, with PNG, you could use the alpha
: channel to store info about whether the pixel has already been computed.

  Not a good solution if you want to use the alpha channel of the final
image for transparency information (possible in povray with option +ua).

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):_;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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