Accurate fitting of measured reflectances using a Shifted Gamma micro‐facet distribution |
| |
Authors: | M M Bagher C Soler N Holzschuch |
| |
Affiliation: | Maverick, INRIA Grenoble‐Rh?ne‐Alpes and LJK (University of Grenoble and CNRS) |
| |
Abstract: | Material models are essential to the production of photo‐realistic images. Measured BRDFs provide accurate representation with complex visual appearance, but have larger storage cost. Analytical BRDFs such as Cook‐Torrance provide a compact representation but fail to represent the effects we observe with measured appearance. Accurately fitting an analytical BRDF to measured data remains a challenging problem. In this paper we introduce the SGD micro‐facet distribution for Cook‐Torrance BRDF. This distribution accurately models the behavior of most materials. As a consequence, we accurately represent all measured BRDFs using a single lobe. Our fitting procedure is stable and robust, and does not require manual tweaking of the parameters. |
| |
Keywords: | http://www acm org/class/1998/ I 3 7 [Computer Graphics]: Three‐Dimensional Graphics and Realism— Color shading shadowing and texture |
|