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Friday, November 1, 2002

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FSAA Details in JK2
9:05 AM | Jean-Luc Dinsdale | Comment on this story

Westlake Interactive's Brad Oliver recently dropped by IMG's Forums to discuss graphical features included in Aspyr Media's newly released title Jedi Knight II: Jedi Outcast.

In his posts, Brad discusses Full Screen Anti-Aliasing (FSAA) options supported by the game, including that fact that it will support Nvidia cards (one of the first commercial titles to do so):

(FSAA is) currently supported in 10.2 (and maybe earlier - I didn't check) on GeForce3 hardware. JK2 has an option to enable it... (Jedi Knight 2) supports multisampling at 2, 4, 5, 8 and 9 points. The 5 and 9 point options are the "Quincunx" modes while the others are the standard multisampling.
The purpose of FSAA is to reduce aliasing artifacts caused by the limitations of both graphics cards and displays. The two main aliasing artifacts are edge aliasing and texture aliasing.

Edge aliasing happens at edges of models most often and can be described as edge "crawling". It gives the appearance of stepping "sliding" up and down the edge of models.

Texture aliasing can be described as "shimmering" or "sparkling". This tends to be particularly problematic in simulation games as they tend to have less then optimal mip mapping to deal with texture aliasing using more simplistic methods.

"Quincunx" anti-aliasing is a new AA technique based on the averaging of five samples around a pixel. From the nVidia web site:

Quincunx AA is a special mode in GeForce3 where two samples are generated per fragment, but 5 samples are averaged together when filtering down, thus increasing the number of effective samples per pixel and giving higher quality than 2 sample AA with only slightly greater cost. The term “Quincunx” comes from the 5-pattern on the side of a die.
"Accuview" AA, mentioned in the posts, is a new multisampling technique:
Accuview improves upon multisampling technology by providing a variety of multisampling modes, including 2x, 4x, Quincunx and a new 4XS mode that delivers improved subpixel coverage and better texture quality. 4XS mode delivers 50% more subpixel coverage than previous modes. This translates into a finer gradation in final pixel color values at the edge of an object, resulting in a smoother antialiased edge.
Stay tuned to IMG for more news of FSAA support on the Mac as they develop.

IMG Forum: FSAA Support in JK2
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Westlake Interactive
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Jedi Knight II: Jedi Outcast
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