Eric P. Lafortune and Yves D. Willems

Report CW197, Department of Computer Science, K.U.Leuven (November 1994).

This text discusses a few aspects of reflectance models in physically based rendering:

- The first section presents the definition of the
*bidirectional reflection distribution function*(*brdf*) of a surface and its physical properties. - On a more practical level, the next section discusses models to
represent
*brdf*s and their desired properties in general for Monte Carlo algorithms. - The third section goes into details about a specific reflectance
model, the modified Phong
*brdf*, with its definition, its properties and its use. We show how this model can be correctly integrated in importance sampling schemes for physically based Monte Carlo rendering algorithms. - The fourth section is devoted to alternative parameter spaces in which reflectance models can be sampled, either deterministically or stochastically.
- The last section discusses an important implementational issue, more specifically the problem of verifying the implementation of a reflectance model.

This Technical Report is available on-line as a gzip'ed Postscript file (19 pages, 117 KBytes, expands to 725 KBytes).

Copyright © 1996-2016 Eric Lafortune.