Extracting Microfacet-based BRDF Parameters from Arbitrary Materials with Power Iterations - Inria - Institut national de recherche en sciences et technologies du numérique Accéder directement au contenu
Article Dans Une Revue Computer Graphics Forum Année : 2015

Extracting Microfacet-based BRDF Parameters from Arbitrary Materials with Power Iterations

Résumé

We introduce a novel fitting procedure that takes as input an arbitrary material, possibly anisotropic, and automatically converts it to a microfacet BRDF. Our algorithm is based on the property that the distribution of microfacets may be retrieved by solving an eigenvector problem that is built solely from backscattering samples. We show that the eigenvector associated to the largest eigenvalue is always the only solution to this problem, and compute it using the power iteration method. This approach is straightforward to implement, much faster to compute, and considerably more robust than solutions based on nonlinear optimizations. In addition, we provide simple conversion procedures of our fits into both Beckmann and GGX roughness parameters, and discuss the advantages of microfacet slope space to make our fits editable. We apply our method to measured materials from two large databases that include anisotropic materials, and demonstrate the benefits of spatially varying roughness on texture mapped geometric models.
Fichier principal
Vignette du fichier
egsr15.pdf (16.64 Mo) Télécharger le fichier
egsr15_slides.pdf (3.8 Mo) Télécharger le fichier
egsr15_supp.pdf (64.59 Mo) Télécharger le fichier
Origine : Accord explicite pour ce dépôt
Origine : Fichiers produits par l'(les) auteur(s)
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01168516 , version 1 (03-07-2015)
hal-01168516 , version 2 (07-07-2015)

Identifiants

  • HAL Id : hal-01168516 , version 2

Citer

Jonathan Dupuy, Eric Heitz, Jean-Claude Iehl, Pierre Poulin, Victor Ostromoukhov. Extracting Microfacet-based BRDF Parameters from Arbitrary Materials with Power Iterations. Computer Graphics Forum, 2015, pp.10. ⟨hal-01168516v2⟩
1645 Consultations
1897 Téléchargements

Partager

Gmail Facebook X LinkedIn More