Rune wrote:
> 
> I think object-specific AA could work well. The biggest problem as I
> see it would be to make bounding objects that were tight enough so
> that not too many calculations are wasted...

Which is why the user would have to specify a specific aa-bound;
that way the user could be precise in selecting the areas that need
it; he could even select a portion of the object, if it were just
that one portion that was the problem.

Regards,
John

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Apache wrote:
> 
> Technically a really hard thing to do.
> If POV-Ray is going to do this, it should be able to trace the edges
> of objects on the screen. Try doing this with isosurfaces ;-)

There is no need to trace the edges.  It merely tests to see if the
bounding object covers the pixel currently being traced.  POV-Ray
already uses bounding objects heavily.  If so, the *pixel* is anti-
aliased at a higher level.

Regards,
John

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Warp wrote:
> 
>   I think that it would require that if the ray hits the object
> which has to be antialieased for the first time in the current line,
> we have to go back one pixel and render it again antialiased.
> And thinking about it, it would also require rendering the same pixel
> in the previous line again the first time we hit the object
> vertically.

This would be an issue with sampling method 2.  Sampling method 1
doesn't worry as much about neighboring pixels.

Regards,
John

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> Warp wrote:
>>  I think that it would require that if the ray hits the object
>>which has to be antialieased for the first time in the current line,
>>we have to go back one pixel and render it again antialiased.
>>And thinking about it, it would also require rendering the same pixel
>>in the previous line again the first time we hit the object
>>vertically.

John VanSickle wrote:
> This would be an issue with sampling method 2.  Sampling method 1
> doesn't worry as much about neighboring pixels.

No, to the contrary: method 1 has to go back if it detects a need of AA.
method 2 always keeps the current and the last generation of pixels
(of a square) and thus is always prepared for kicking in the AA.


Regards,
Hermann

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