[Xmas]

Originally Posted by Morgoth the Dark Enemy

But then it is a different tent-filter from the narrow/wide implementations that are transparently available...considering the current ATi nomenclature(tripling of base-AA level) it must be a very-wide tent filter(as wide "doubles" the base AA level in CCC terms and narrow multiplies it by 1.5).

I wouldn't give a lot on the nomenclature, but judging from no-X's screenshots it might indeed be a significantly wider filter. It might also be a different filter shape than tent.

[AlexV]

Originally Posted by Xmas

I wouldn't give a lot on the nomenclature, but judging from no-X's screenshots it might indeed be a significantly wider filter. It might also be a different filter shape than tent.

Well, in my experience, sample density is highly improved in 24x ED when compared to the base 8X-a simple black square on white background, slightly tilted shows this quite nicely, so it's probably something else...gah, I hate picking at straws

[no-X]

I agree with Xmas. It's a wider filter. It's visible on 4x / 8x WT / 12x ED differences (8x zoomed):

4x (box)


8x (WT)


12x (ED)


More samples per-pixel would cause more continuous transition on this angle (using a good pattern). This two-pixel steps are supposedly caused by significantly wider filter. It works on other angles, it works on 24x ED (because higher sample density of MSAA 8x cause nearer location of these 2-pixel steps), but on 12x ED and this angle, ED isn't perfect and due to this unperfection we can judge how it's done.

[AlexV]

Originally Posted by no-X

I agree with Xmas. It's a wider filter. It's visible on 4x / 8x WT / 12x ED differences (8x zoomed):

4x (box)


8x (WT)


12x (ED)


More samples per-pixel would cause more continuous transition on this angle (using a good pattern). This two-pixel steps are supposedly caused by significantly wider filter. It works on other angles, it works on 24x ED (because higher sample density of MSAA 8x cause nearer location of these 2-pixel steps), but on 12x ED and this angle, ED isn't perfect and due to this unperfection we can judge how it's done.

Thanks for the zoomed-in pictures. Yup, you seem to be correct...interesting.

[no-X]

You're welcome. As I said, other angles are OK and almost perfectly smooth (zoom 7,5x):

detail 4x box:


detail 12x ED:



24x ED is OK (almost perfect) for all angles (thanks to sufficient level of per-pixel samples even for very low angles; zoom 8x):

8x box


24x ED


the only thing which could be improved (to make me happier) would be the transition between last AAed pixel and black area, which isn't perfectly smooth because of box filter usage for this pixel, as Xmas mentioned. The step is even a bit amplified by ATis' gamma correction. I think 2.20 is a bit much, even for my Diamondtron CRT. It would be nice if ATi let users to set their own level, or at least prepare some basic presets (CRT, LCD...). I played a bit with a graphical editor and ~ 1.80 semms to be best for my eyes and my CRT

[ERK]

To me that doesn't look like a wider filter for ED, but just a finer grid/more samples within the box. The ED pattern shows much more in common with the box than it does with the wide tent. In a way I almost prefer the wide tent because it offers a consistent transition to the edges, as opposed to sometimes there is an abrupt change from one color to another, and sometimes there is an intermediate blended pixel at the edge. With the tent there is always the blended edge=no jaggies (but slightly more blurring perhaps).

Thanks for the excellent pictures and examples.

ERK