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To: Alexis Cousein who wrote (6125)	5/27/1999 10:57:00 AM
From: Woody_Nickels	Read Replies (1) \| Respond to of 14451

WOW! Alexis, thanks for the explanation. I actually understand much of what you wrote. Doesn't the VW320 handle large amounts of main memory as video buffers (?) and move the data into the video/graphics processor in one piece?

To: Alexis Cousein who wrote (6125)	5/27/1999 11:22:00 AM
From: Bill Holtzman	Respond to of 14451

Thanks, Alexis, for a great explanation. I saw a demo once at Mt View where the operator zoomed in on some computer animation and the anti-aliasing went to work to keep up. Does it generate new polygons in this case?

To: Alexis Cousein who wrote (6125)	5/27/1999 3:15:00 PM
From: brushwud	Read Replies (1) \| Respond to of 14451

Antialiasing can be done by pre-filtering or post-filtering. Your explanation pertains to post-filtering: > Anti-aliasing is a method by which a pixel colour is determined by > sampling more than one subpixel (with fractional coordinates) and > averaging. Pre-filtering, in theory, would accumulate contributions from all surfaces which contribute to a given pixel, but in practice, might accumulate contributions from some subset of such surfaces. Pre-filtering tends not to have the visual artifacts of the post-filtering approaches based on subpixel sampling. But "stochastic" sampling can reduce artifacts by sampling randomly (or pseudo-randomly), not on a regular grid. > as an example, a TV has only roughly 500 lines of video, but no < aliasing artefacts -- and you'll note that you neither see jaggies > or creepies when watching a movie ;) You can certainly see artifacts of scan lines on TV. Perhaps the jaggies don't catch your eye because of the 30 Hz (U.S.) frame rate, but if you look at a still frame, you can find them. Vertical artifacts may be less pronounced because of the analog character of TV. Often if talking heads are wearing thin-striped ties or shirts, they turn into sparkling psychedelic rainbows because of aliasing.