Evolutionary Design of BRDFs

Meyer-Spradow, Jennis; Loviscach, Joern

Evolutionary Design of BRDFs

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brdf1.mpg (728.52 KB)

brdf2.mpg (728.52 KB)

Date

2003

Authors

Meyer-Spradow, Jennis
Loviscach, Joern

Publisher

Eurographics Association

Abstract

The look of a non-transparent material is determined by its bidirectional reflection distribution function (BRDF). To design 3-D objects for example for games or animation films thus includes to design BRDFs. However, as functions defined on a four-dimensional domain, these form a vast space that is very difficult to explore interactively. Typically, the infinite number of degrees of freedom is reduced to a tractable handful of parameters by introducing simplified physical models or heuristic approximations such as Phongs. As the complexity of such approaches increases, they become difficult to master for a human operator. Even if many parameters are made accessible, an infinite variety of useful and/or interesting BRDFs remains hidden and inaccessible. We therefore propose a method of constructing BRDFs through genetic programming with a human operator making choices based on his or her preferences. With the pixel shader programmability of modern graphics cards this can be performed in real time.

        @inproceedings{:10.2312/egs.20031043
,
booktitle = {Eurographics 2003 - Short Presentations
},
editor = {},
title = {{Evolutionary Design of BRDFs
}},
author = {Meyer-Spradow, Jennis and 
Loviscach, Joern
},
year = {2003
},
publisher = {Eurographics Association
},
ISSN = {1017-4656
},
ISBN = {},
DOI = {/10.2312/egs.20031043
}
}