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Old 07-02-2004, 02:30 AM   #1 (permalink)
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Default AA and AF??!!

im new and was wondering what the AA and AF meant for a video card, i hear people tellin me to change it or something. plz tell me what its all about and how u change it if u can.
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Old 07-02-2004, 02:33 AM   #2 (permalink)
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AA = Antialiasing
AS = Anisotropic

They're suppose to enhance video quality or something. Not sure what. I think if you turn them off, you get better performance.

Control Panel > Display > Settings > Advanced
It should be somewhere in there. It's listed under different tabs depending on your video card.
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Old 07-02-2004, 02:54 AM   #3 (permalink)
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Simply put:

Anti-aliasing blends together neighboring pixels of edge of an object to smooth it out, anisotropic filtering is used to sharpen the appearance of objects that are located far away from the camera in a viewing plane.
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Old 07-02-2004, 03:29 AM   #4 (permalink)
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Nicely put Martin...
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Old 07-02-2004, 03:33 AM   #5 (permalink)
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I have played with them on full and with them both off...didn't notice a difference really. Except for the extra lag.
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Old 07-02-2004, 03:36 AM   #6 (permalink)
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Anti Aliasing, like Martin said merges pixels that are close together which removes the jagged edges in objects that are curved or diagonal. Ij you were to take a close look at a curve for instance, you would see several things like this _l making the circle. Anti aliasing would blend those 2 pixels to make it more like this /. The higher the setting, the more samples you take and blend together to improve the effect. This is very demanding on your CPU since it has to do several calculations.

Anisotropic filtering will increase the LOD (level of details). This is mostly visible in very close objects. A good example is with the Star-Trek Elite Force 2 games. With AF set to 4X you could read the ship's computer panels when standing close to them while they were blurry with no AF. It also requires a lot of resources so unless you have a good CPU and video cards, these 2 have to be set fairly low in order to eliminate choppy fps and gameplay.

Since lower resolution will show more jagged edges than higher ones (i.e. 800 X 600) aliasing becomes less apparent at higher resolution therefore the level of AA used can be decreased.

If you check ANANDTECH and TOMSHARDWARE site, they give good visual examples of AA and AF for both ATI and NVIDIA
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Old 07-02-2004, 11:31 PM   #7 (permalink)
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Quote:
Originally posted by slvrstang
I have played with them on full and with them both off...didn't notice a difference really. Except for the extra lag.
So have I, and I noticed a tremendous difference, espically with AA. Without AA, you have very noticable jaggies. With 2x AA it gets a little better, but where it really starts looking good is 4x AA. AF makes the rendering appear much smoother, in my opinion.
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Old 07-02-2004, 11:47 PM   #8 (permalink)
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Quote:
Originally posted by beedubaya
So have I, and I noticed a tremendous difference, espically with AA. Without AA, you have very noticable jaggies. With 2x AA it gets a little better, but where it really starts looking good is 4x AA. AF makes the rendering appear much smoother, in my opinion.
I expected better from a "9800 pro on steroids" card.
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