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Accurate fitting of measured reflectances using a Shifted Gamma micro-facet distribution

Mahdi Bagher 1 Cyril Soler 1 Nicolas Holzschuch 1
1 MAVERICK - Models and Algorithms for Visualization and Rendering
Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann, Grenoble INP - Institut polytechnique de Grenoble - Grenoble Institute of Technology
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.
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Submitted on : Friday, June 1, 2012 - 11:01:05 AM
Last modification on : Monday, November 8, 2021 - 9:48:06 AM
Long-term archiving on: : Friday, November 30, 2012 - 1:05:13 PM


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Mahdi Bagher, Cyril Soler, Nicolas Holzschuch. Accurate fitting of measured reflectances using a Shifted Gamma micro-facet distribution. Computer Graphics Forum, Wiley, 2012, 31 (4), pp.1509-1518. ⟨10.1111/j.1467-8659.2012.03147.x⟩. ⟨hal-00702304⟩



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