Real-time rendering of layered materials with anisotropic normal distributions
Real-time rendering of layered materials with anisotropic normal distributions
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DOI：
10.1007/s41095-019-0154-z
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发表时间：
2019-11
影响因子：
6.9
通讯作者：
Tomoya Yamaguchi;Tatsuya Yatagawa;Yusuke Tokuyoshi;S. Morishima
中科院分区：
文献类型：
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作者：
Tomoya Yamaguchi;Tatsuya Yatagawa;Yusuke Tokuyoshi;S. Morishima
提出了一种适用于具有各向异性反射和折射特性的层状介质的轻量双向散射分布函数模型。在我们的方法中，每一层的材料可以被描述为一个微面BSDF使用各向异性的正态分布函数（NDF）。此外，层的NDF可以在切向量场上定义，其在层与层之间不同。我们的方法是基于以前的研究，其中各向同性BSDF近似投影到基平面上。然而，以前的工作的充分性还没有得到很好的研究各向异性BSDF。在本文中，我们证明了投影也适用于各向异性BSDF，并且可以使用协方差矩阵用椭圆分布来近似它们。
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 they can be approximated by elliptical distributions using covariance matrices.