Microfacet BSDFs Generated from NDFs and Explicit Microgeometry
| Autor: | Benjamin Bringier, Mickaël Ribardière, Lionel Simonot, Daniel Meneveaux |
|---|---|
| Přispěvatelé: | Synthèse et analyse d'images (XLIM-ASALI), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Université de Poitiers, Institut Pprime (PPRIME), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2019 |
| Předmět: |
Computer science
Scattering Global illumination [SCCO.COMP]Cognitive science/Computer science 020207 software engineering 02 engineering and technology Function (mathematics) 01 natural sciences Computer Graphics and Computer-Aided Design 010309 optics Normal distribution 0103 physical sciences Bidirectional scattering distribution function Path tracing 0202 electrical engineering electronic engineering information engineering Piecewise Anisotropy Representation (mathematics) Algorithm ComputingMilieux_MISCELLANEOUS Importance sampling ComputingMethodologies_COMPUTERGRAPHICS |
| Zdroj: | ACM Transactions on Graphics ACM Transactions on Graphics, Association for Computing Machinery, 2019, 38 (5), pp.1-15. ⟨10.1145/3338697⟩ |
| ISSN: | 1557-7368 0730-0301 |
| DOI: | 10.1145/3338697 |
| Popis: | Microfacet distributions are considered nowadays as a reference for physically plausible BSDF representations. Many authors have focused on their physical and mathematical correctness, while introducing means to enlarge the range of possible appearances. This article is dedicated to Normal Distribution Functions (NDFs) and the influence of their shape on the rendered material aspect. We provide a complete framework for studying the impact of NDFs on the observed Bidirectional Scattering Distribution Functions (BSDFs). To explore very general NDFs, manually controlled by the user, and including anisotropic materials, we propose to use a piecewise continuous representation. It is derived with its associated Smith shadowing-masking function and importance sampling formulations for ensuring efficient global illumination computations. A new procedure is also proposed in this article for generating an explicit geometric micro-surface, used to evaluate the validity of analytic models and multiple scattering effects. The results are produced with a computer-generated process using path tracing. They show that this generation procedure is suitable with any NDF model, independently from its shape complexity. |
| Databáze: | OpenAIRE |
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