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From: david@sun.uucp (David DiGiacomo)
Newsgroups: comp.graphics
Subject: Re: Ray tracing and caustics.
Message-ID: <23177@sun.uucp>
Date: Fri, 10-Jul-87 13:16:57 EDT
Article-I.D.: sun.23177
Posted: Fri Jul 10 13:16:57 1987
Date-Received: Sun, 12-Jul-87 12:23:35 EDT
References: <219@sugar.UUCP>
Organization: Sun Microsystems, Inc. - Mtn View, CA
Lines: 12

In article <219@sugar.UUCP> peter@sugar.UUCP (Peter DaSilva) writes:
>It has occurred to me that I have never seen such an effect in ray-traced
>images. It shouldn't be too hard: you would have to reverse ray-trace from
>the light source for each transparent object and add the caustic to the
>texture map for each matte object it eventually falls on. Has anyone
>considered doing this?

Yes.  Take a look at the last illustration in Jim Kajiya's paper "The
Rendering Equation" in the Siggraph '86 proceedings.

P.S. Why is this paper illustrated by two tiny images surrounded by a
vast expanse of blank paper?  Grrr.