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From: peter@sugar.UUCP (Peter da Silva)
Newsgroups: comp.graphics
Subject: Rainbows (was Re: Ray tracing and caustics.)
Message-ID: <439@sugar.UUCP>
Date: Tue, 28-Jul-87 22:40:41 EDT
Article-I.D.: sugar.439
Posted: Tue Jul 28 22:40:41 1987
Date-Received: Sun, 2-Aug-87 10:49:31 EDT
References: <219@sugar.UUCP> <543@saturn.ucsc.edu> <1827@vax135.UUCP>
Organization: Sugar Land UNIX - Houston, TX
Lines: 16
Keywords: ray-tracing caustics algorithm reality
Summary: How about chromatic abberation?

OK, I think I have come up with something the rendering equation won't
cover. Chromatic abberation. You know... the stuff that makes rainbows
colorful and diamonds sparkly. I don't think backtracking would give
you that. Preprocessing and painting will.

Hold on. I think I can see how backtracking could work. You just calculate
a sample of paths whenever you refract. Tag each path with a color
value. Except for small angles the spread will probably be too small
to bother with. Anyway, when you recombine the paths you selectively
reduce the contribution of the other colors.

I'm not a computer graphics heavy, and I haven't reda the article, but
I don't remember seeing this one described anywhere. Does this get me
a citation :->?
-- 
-- Peter da Silva `-_-' ...!seismo!soma!uhnix1!sugar!peter (I said, NO PHOTOS!)