Path: utzoo!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!uflorida!ukma!rutgers!att!alberta!yigong
From: yigong@alberta.UUCP (Yigong Wang)
Newsgroups: comp.graphics
Subject: Re: Radiosity programs, anyone?
Message-ID: <2043@pembina.UUCP>
Date: 12 Feb 89 00:47:23 GMT
References: <50267@yale-celray.yale.UUCP>
Reply-To: yigong@pembina.UUCP (Yigong Wang)
Organization: U. of Alberta, Edmonton, Alberta, Canada
Lines: 30

In article <50267@yale-celray.yale.UUCP> engelson-sean@CS.YALE.EDU (Sean Philip Engelson) writes:
>
>Does anyone out there have or know of a program to do radiosity
>imaging that I could get (with source!) and play with, preferably for
>

I have such a program that produces very good radiosity images. But it
is very slow, and especially not portable (I used some graphics packages built
here). 

>a Pixar?  I'm planning on doing some work with radiosity-type stuff,
>and would like to avoid building the entire system from scratch.
>

Actually, a radiosity program is not so complex as it is thought. Basically,
it consists of four parts which are quite independent of each other:

           Subdivider: divide polygons into smaller patches;
           Form-factor calculator: determine form-factor between patches;
           Guass-Siedel solver: solve radiosity equations;
           Render: display final image.

The major part is the form-factor calculation. I try to make the part
machine-independent. Obviously, the solver is always available.

The program only deals with diffuse surfaces. I am working on other
aspects.

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email: yigong@pembina.alberta.UUCP