Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!cs.utexas.edu!uunet!smosjc!glenn
From: glenn@smosjc.UUCP (Glenn Poole)
Newsgroups: comp.graphics
Subject: Material constants for Phong lighting model
Message-ID: <648@smosjc.UUCP>
Date: 14 May 91 00:49:05 GMT
Organization: S-MOS Systems, San Jose, Ca., USA
Lines: 32

I am working on a rendering system using the phong lighting model.
The lighting equations we are using are similar to:

Cobject= Cambient + Cdiffuse*Clight*(N.L) + Cspecular*Clight*(N.H)^n

Where:

	N.L is the dot product of the normal vector and the light vector
	    (N and L both normalized)

	N.H is the dot product of the normal vector and the half-way vector
	    which is halfway between the L and V vectors.  
	    (N and H both normalized)

	n is the "specular exponent"

This is essentially the textbook formulation, as found in Foley & vanDam 2nd Ed,
pages 722-731, except they separate the coeficients into a product of
coefficients, such as: Cambient <=> IAlambda* KA* ODlambda.

Now for the question:  Does anyone know where can I get a list or library 
of material properties for some common materials, such as wood, paper, 
plastic, brushed aluminum, etc?  Best would be a computer file with 
the Cambient, Cdiffuse, Cspecular and n parameters for a variety of 
interesting materials.  A list in a book would also be good.


Thanks in advance.

Glenn Poole
S-MOS Systems, Inc
San Jose, CA