Interactive Rendering with Arbitrary BRDFs using Separable Approximations

Kautz, Jan; McCool, Michael D.

Interactive Rendering with Arbitrary BRDFs using Separable Approximations

Files

247-260.pdf (18.1 MB)

Date

1999

Authors

Kautz, Jan
McCool, Michael D.

Publisher

The Eurographics Association

Abstract

A separable decomposition of bidirectional reflectance distributions (BRDFs) is used to implement arbitrary reflectances from point sources on existing graphics hardware. Two-dimensional texture mapping and compositing operations are used to reconstruct samples of the BRDF at every pixel at interactive rates. A change of variables, the Gram-Schmidt halfangle/difference vector parameterization, improves separability. Two decomposition algorithms are also presented. The singular value decomposition (SVD) minimizes RMS error. The normalized decomposition is fast and simple, using no more space than what is required for the final representation.

        @inproceedings{:10.2312/EGWR/EGWR99/247-260
,
booktitle = {Eurographics Workshop on Rendering
},
editor = {Dani Lischinski and Greg Ward Larson
},
title = {{Interactive Rendering with Arbitrary BRDFs using Separable Approximations
}},
author = {Kautz, Jan and 
McCool, Michael D.
},
year = {1999
},
publisher = {The Eurographics Association
},
ISSN = {1727-3463
},
ISBN = {3-211-83382-X
},
DOI = {/10.2312/EGWR/EGWR99/247-260
}
}