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The halfway vector disk for BRDF Modeling

delete2006-01-01
delete33
PRE
AI
J
Jared Johnson
P
Peter Shirley
M
Michael Stark
C
Chris Wyman
DOI：10.1145/1122501.1122502delete
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Abstract

Abstract

En 中文
We present a mathematical framework for enforcing energy conservation in a bidirectional reflectance distribution function (BRDF) by specifying halfway vector distributions in simple two-dimensional domains. Energy-conserving BRDFs can produce plausible rendered images with accurate reflectance behavior, especially near grazing angles. Using our framework, we create an empirical BRDF that allows easy specification of diffuse, specular, and retroreflective materials. We also present a second BRDF model that is useful for data fitting; although it does not preserve energy, it uses the same halfway vector domain as the first model. We show that this data-fitting BRDF can be used to match measured data extremely well using only a small set of parameters. We believe that this is an improvement over table-based lookups and factored versions of BRDF data.
Keywords:
design
performance
BRDF
global illumination
Monte Carlo
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Journal

ACM Transactions on Graphics cover
ACM Transactions on Graphics
IF:
9.5
Papers:
4.7K
Citations:
3.6W

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