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From: steve@bambi.UUCP (Steve Miller)
Newsgroups: net.graphics
Subject: Re: Possible way of anti-aliasing.
Message-ID: <551@bambi.UUCP>
Date: Sat, 11-Oct-86 19:30:12 EDT
Article-I.D.: bambi.551
Posted: Sat Oct 11 19:30:12 1986
Date-Received: Sun, 12-Oct-86 02:06:38 EDT
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> Ken Turkowski posts a way to analytically anti-alias circles (thanks!),
> but claims that this shows that it's possible to anti-alias "curved
> surfaces".  Unfortunately, flat circles are different from curved
> surfaces.  To anti-alias the rendition of a curved surface properly,
> one must anti-alias any sharp-edged color changes; for example, the
> edge of a highlight.

A good reference here is "Pyramidal Parametrics," by Lance Williams,
Siggraph Proceedings, 1983.  Basically, Lance interpolates between pairs
of pre-filtered images of spheres, where the images include highlights.

Anyone planning to implement this approach should also read "Summed-Area
Tables for Texture Mapping," by Franklin Crow, Siggraph Proceedings 1984.

	-Steve Miller ihnp4!bellcore!bambi!steve