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From: ken@turtlevax.UUCP (Ken Turkowski)
Newsgroups: net.graphics
Subject: Re: Color calc. for ray tracing, HELP
Message-ID: <589@turtlevax.UUCP>
Date: Sun, 11-Nov-84 19:30:37 EST
Article-I.D.: turtleva.589
Posted: Sun Nov 11 19:30:37 1984
Date-Received: Tue, 13-Nov-84 00:59:52 EST
References: <31000007@uiucdcs.UUCP> <3106@utah-cs.UUCP>
Organization: CADLINC, Inc. @ Palo Alto, CA
Lines: 20

> > I'm starting on a ray tracing project but I'm having one problem.
> > I don't know how to convert the intensity calculations from the 
> > reflection model into the appropriate RGB values for display.
> > I know it has something to do with integrating certain functions 
> > to get the XYZ values and then transforming these to the RGB space 
> > via a matrix multiplication.
> 
> What you're refering to with the transformation matrices is probably 
> Cornell style color and shading models.  These are well described; they
> wrote a couple of papers on the subject in Siggraph '79 (see the procedings
> for that year).  I believe it falls under the title "color gamut
> transform pairs", I don't have the procedings handy, but it's pretty
> easy to find it.

The paper, "Color Gamut Transform Pairs" was written by Alvy Ray Smith,
and appears in the 1978 SIGGRAPH proceedings, pp. 12-19.
-- 
Ken Turkowski @ CADLINC, Palo Alto, CA
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