Extracting Microfacet‐based BRDF Parameters from Arbitrary Materials with Power Iterations (English)

In: Computer Graphics Forum   ;  34 ,  4  ;  21-30  ;  2015

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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.

Table of contents – Volume 34, Issue 4

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The tables of contents are generated automatically and are based on the data records of the individual contributions available in the index of the TIB portal. The display of the Tables of Contents may therefore be incomplete.

1
Stochastic Soft Shadow Mapping
Liktor, G. / Spassov, S. / Mückl, G. / Dachsbacher, C. | 2015
13
Portal‐Masked Environment Map Sampling
Bitterli, Benedikt / Novák, Jan / Jarosz, Wojciech | 2015
21
Extracting Microfacet‐based BRDF Parameters from Arbitrary Materials with Power Iterations
Dupuy, Jonathan / Heitz, Eric / Iehl, Jean‐Claude / Poulin, Pierre / Ostromoukhov, Victor | 2015
31
Physically Meaningful Rendering using Tristimulus Colours
Meng, Johannes / Simon, Florian / Hanika, Johannes / Dachsbacher, Carsten | 2015
41
Consistent Scene Editing by Progressive Difference Images
Günther, Tobias / Grosch, Thorsten | 2015
53
Unifying Color and Texture Transfer for Predictive Appearance Manipulation
Okura, Fumio / Vanhoey, Kenneth / Bousseau, Adrien / Efros, Alexei A. / Drettakis, George | 2015
65
Improved Half Vector Space Light Transport
Hanika, Johannes / Kaplanyan, Anton / Dachsbacher, Carsten | 2015
75
Probabilistic Connections for Bidirectional Path Tracing
Popov, Stefan / Ramamoorthi, Ravi / Durand, Fredo / Drettakis, George | 2015
87
Manifold Next Event Estimation
Hanika, Johannes / Droske, Marc / Fascione, Luca | 2015
99
Smooth Loops from Unconstrained Video
Sevilla‐Lara, L. / Wulff, J. / Sunkavalli, K. / Shechtman, E. | 2015
109
Radiometric Transfer: Example‐based Radiometric Linearization of Photographs
Li, Han / Peers, Pieter | 2015
119
Motion Aware Exposure Bracketing for HDR Video
Gryaditskaya, Yulia / Pouli, Tania / Reinhard, Erik / Myszkowski, Karol / Seidel, Hans‐Peter | 2015
131
Path‐space Motion Estimation and Decomposition for Robust Animation Filtering
Zimmer, Henning / Rousselle, Fabrice / Jakob, Wenzel / Wang, Oliver / Adler, David / Jarosz, Wojciech / Sorkine‐Hornung, Olga / Sorkine‐Hornung, Alexander | 2015
143
Wavelet Point‐Based Global Illumination
Wang, Beibei / Meng, Xiangxu / Boubekeur, Tamy | 2015
155
Modeling Luminance Perception at Absolute Threshold
Kellnhofer, Petr / Ritschel, Tobias / Myszkowski, Karol / Eisemann, Elmar / Seidel, Hans‐Peter | 2015
165
Illumination‐driven Mesh Reduction for Accelerating Light Transport Simulations
Reich, Andreas / Günther, Tobias / Grosch, Thorsten | 2015
i
Frontmatter
| 2015
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