Adaptive AA / Temporal AA

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Slo Gun

Limp Gawd
Joined
Sep 10, 2005
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If you enable adaptive AA in the control panel, but set the number of samples to let the application decide, will adaptive aa still work?
Also I read that temporal AA is only any good if you have a refresh rate of 100hz or more (its quite an old article tho, see link below).
I am on an LCD and only have 75hz, so would there be any point in using this?
Also i was wondering what the performance hit if any of using temporal AA would be.

Thanks


http://www.elitebastards.com/page.php?pageid=4533&head=1&comments=1
 
temporal AA uses an optical effect to trick the eye into thinking the image looks better than it really is... So running temporal 2xAA will look like 4xAA

But because it is an optical effect, your framerate must be a constant 60 FPS or else you will be able to see a "shimmer" in all the graphics.
 
60 fps sounds like a better reference, because the refresh rates of LCDs are not comparable to CRTs right?
 
DermicSavage said:
temporal AA uses an optical effect to trick the eye into thinking the image looks better than it really is... So running temporal 2xAA will look like 4xAA

But because it is an optical effect, your framerate must be a constant 60 FPS or else you will be able to see a "shimmer" in all the graphics.
Click to expand...

Is that 60fps before or after vsync?
 
Slo Gun said:
Is that 60fps before or after vsync?
Click to expand...

I believe temporal AA uses vsync to make sure the card is maintaining 60fps. If the card can't manage it, I wouldn't recommend using TempAA...
 
Temporal AA runs surprisingly well on high refresh rate LCD's (75hz+, not 60hz)

Thing is, the pixel warmup and down times are so slow, even on 8ms panels, that the effect is *smoothed* out which would otherwise be pretty noticable on a 75hz CRT.

On CRT's it can be noticable, you should really be running 85hz+, preferrably 90hz or more and force the temporal AA to only show up when the FPS is over 90 (instead of the default 60). In those instances, at least for me personally the free temporal AA is definitely worth it.
 
100Hz is recommended for using the 3x multiplier as the pattern will be changing more often than the default 2x multi. Though even with a high refresh rate, it would be pretty difficult to maintain that kind of framerate to avoid flickering in today's games. 2x TAA looks fine on LCD's with the threshold around 30fps IMO (because of the aforementioned pixel decay), though on CRT's I can see flickering starting at around the lower fiftys. Every monitor and pair of eyes is different, so it's definitely worth experimenting with. Don't forget to have triple buffering enabled to avoid any buffer underruns with the VSync that would cause flickering with TAA.
 
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