Looks like this can be significantly improved by changing AA settings.

Try any or all:

 - Turn off AA jitter (-J)
 - Increase sampling depth (+R4 (or 5))
 - Use AA method 2 (+AM2) (beware high sampling depths with this)

As for the straight lines, they'll still have their edges anti-aliased,
which may create a sort of blurring effect along their edges. (It shouldn't
be fuzzy if you get the AA right, but it won't be completely sharp either.)
This can be fixed, if it bothers you, by carefully placing the edges of the
object that makes the outline so that it lines up with the edges of pixels.
The best way to do that would be to make a macro which takes an (x,y)
coordinate and returns the nearest <x,y,z> on the image by using image_width
and image_height. Of course, the details depend on your camera position and
settings.

 - Slime
 [ http://www.slimeland.com/ ]

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