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

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dc.contributor.authorDupuy, Jonathanen_US
dc.contributor.authorHeitz, Ericen_US
dc.contributor.authorIehl, Jean-Claudeen_US
dc.contributor.authorPoulin, Pierreen_US
dc.contributor.authorOstromoukhov, Victoren_US
dc.contributor.editorJaakko Lehtinen and Derek Nowrouzezahraien_US
dc.date.accessioned2015-06-23T04:47:37Z
dc.date.available2015-06-23T04:47:37Z
dc.date.issued2015en_US
dc.description.abstractWe 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.en_US
dc.description.number4en_US
dc.description.sectionheadersMaterial Appearanceen_US
dc.description.seriesinformationComputer Graphics Forumen_US
dc.description.volume34en_US
dc.identifier.doi10.1111/cgf.12675en_US
dc.identifier.pages021-030en_US
dc.identifier.urihttps://doi.org/10.1111/cgf.12675en_US
dc.publisherThe Eurographics Association and John Wiley & Sons Ltd.en_US
dc.subjectI.3.3 [Computer Graphics]en_US
dc.subjectPicture/Image Generationen_US
dc.subjectAntialiasingen_US
dc.subjectI.3.7 [Computer Graphics]en_US
dc.subjectThree Dimensional Graphics and Realismen_US
dc.subjectColoren_US
dc.subjectshadingen_US
dc.subjectshadowingen_US
dc.subjectand textureen_US
dc.titleExtracting Microfacet-based BRDF Parameters from Arbitrary Materials with Power Iterationsen_US
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34-Issue 4
EGSR15: 26th Eurographics Symposium on Rendering