glenn@smosjc.UUCP (Glenn Poole) (05/14/91)
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
mark@calvin..westford.ccur.com (Mark Thompson) (05/15/91)
In article <648@smosjc.UUCP> glenn@smosjc.UUCP (Glenn Poole) writes: >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. "Illumination and Color in Computer Generated Imagery" by Roy Hall is an excellent book for describing the problem of realistic surface rendering and has a number of tables, plots, and guidlines for rendering various materials. In Hall's book, he references Purdue University (1970) "Thermophysical Properties of Matter", Thermophysical Properties Research Center, for the various spectral curves and data for a multitude of materials. Hope this helps. %~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~% % ` ' Mark Thompson CONCURRENT COMPUTER % % --==* RADIANT *==-- mark@westford.ccur.com Principal Graphics % % ' Image ` ...!uunet!masscomp!mark Hardware Architect % % Productions (508)392-2480 (603)424-1829 & General Nuisance % % % ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~