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SUMMARY:Microfacet BRDF models  
DTSTART:20140620T151500
DTSTAMP:20260407T084850Z
UID:9cdb1cee575588f51930b486e135f586ff6604e58d67aad4573ab3c9
CATEGORIES:Conferences - Seminars
DESCRIPTION:Lionel SIMONOT\, Université de Poitiers\, France\nThe volume 
 and surface scattering of a material is usually defined at a macroscopic 
 scale by its bidirectional reflectance distribution function (BRDF) that 
 describes the chance of reflection for different pairs of incoming and ou
 tgoing light directions. It is widely used in remote sensing\, science mat
 erial\, lighting simulation or computer graphics.\nMicrofacet BRDF models 
 are based on a geometrical description of the material surface as a collec
 tion of microfacets whose dimensions are much greater than the wavelength.
  The resulting BRDF dépends on the microfacet slope distribution\, the sh
 adowing-masking function and the BRDF of the individual facets. In the ori
 ginal Cook-Torrance model\, and in most of cases even today\, each facet i
 s assumed to reflect light only in the specular direction. The third facto
 r of the model is then given by the Fresnel relation depending on the mate
 rial refractive index.\nWe will present the generalization of microfacet m
 odels for any radiometric response of the individual facets. Some crucial 
 points (radiometric proof of the model\, choice of the distribution and of
  the shadowing-masking function\, numerical calculations…) will be discu
 ssed. And we propose to consider facets consisting of a flat interface on 
 a Lambertian background. The Oren-Nayar model distribution of strictly Lam
 bertian facets and the Cook-Torrance model distribution of strictly specul
 ar facets appear as special cases.
LOCATION:BC 420 https://plan.epfl.ch/?room==BC%20420
STATUS:CONFIRMED
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