1. Real-time rendering of layered materials with anisotropic normal distributions
- Author
-
Tatsuya Yatagawa, Yusuke Tokuyoshi, Shigeo Morishima, and Tomoya Yamaguchi
- Subjects
Physics ,microfacet BSDF ,Mathematical analysis ,Isotropy ,real-time rendering ,020207 software engineering ,02 engineering and technology ,Computer Graphics and Computer-Aided Design ,lcsh:QA75.5-76.95 ,Projection (linear algebra) ,Normal distribution ,reflection modeling ,Reflection (mathematics) ,layered materials ,Artificial Intelligence ,Bidirectional scattering distribution function ,0202 electrical engineering, electronic engineering, information engineering ,Refraction (sound) ,lcsh:Electronic computers. Computer science ,Computer Vision and Pattern Recognition ,Tangent vector ,Anisotropy - Abstract
This paper proposes a lightweight bidirectional scattering distribution function (BSDF) model for layered materials with anisotropic reflection and refraction properties. In our method, each layer of the materials can be described by a microfacet BSDF using an anisotropic normal distribution function (NDF). Furthermore, the NDFs of layers can be defined on tangent vector fields, which differ from layer to layer. Our method is based on a previous study in which isotropic BSDFs are approximated by projecting them onto base planes. However, the adequateness of this previous work has not been well investigated for anisotropic BSDFs. In this paper, we demonstrate that the projection is also applicable to anisotropic BSDFs and that the BSDFs are approximated by elliptical distributions using covariance matrices.
- Published
- 2020