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The SSOA in the graphics options (running hardware test), makes a 12 fps (from 14fps to 26fps on a 2.53Ghz 13" MacBook Pro with Nvida 9400M graphics running at 1280x800) difference but the given explanation didn't mean much to me, nor could I really see any difference on that hardware test (beyond flames flickering badly and then well when SSOA was off)

What does it actually do?
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tarasis: The SSOA in the graphics options (running hardware test), makes a 12 fps (from 14fps to 26fps on a 2.53Ghz 13" MacBook Pro with Nvida 9400M graphics running at 1280x800) difference but the given explanation didn't mean much to me, nor could I really see any difference on that hardware test (beyond flames flickering badly and then well when SSOA was off)

What does it actually do?
http://en.wikipedia.org/wiki/Screen_Space_Ambient_Occlusion there you go.
It used for shading surfaces which light less received. Like corners of a room. It helps to give object volumetric feel.
http://icrontic.com/uploads/features/gaming/2009/10/Screen-Space-Ambient-Occlusion.jpg Right side have SSAO (Screen Space Ambient Occlusion)
Post edited April 11, 2012 by golge_avcisi
http://en.wikipedia.org/wiki/Screen_Space_Ambient_Occlusion - that's all that I can tell.
Simplest way to explain it.

It makes shadows more "Deep" and a softer edge.