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Research Article | Open Access

Real-time rendering of layered materials with anisotropic normal distributions

Waseda University, Tokyo, 155-8885, Japan.
The University of Tokyo, Tokyo, 153-8656, Japan.
Intel Corporation, CA, 95054, USA.
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Abstract

This paper proposes a lightweight bi-directional 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.

Keywords

layered materialsmicrofacet BSDFreflection modelingreal-time rendering

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Computational Visual Media
Volume 6 Issue 1,
March 2020
Pages 29-36
DOI: 10.1007/s41095-019-0154-z
Cite this article:
Yamaguchi T, Yatagawa T, Tokuyoshi Y, et al. Real-time rendering of layered materials with anisotropic normal distributions. Computational Visual Media, 2020, 6(1): 29-36. https://doi.org/10.1007/s41095-019-0154-z

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Revised: 14 December 2019
Accepted: 21 December 2019
Published: 27 January 2020
© The Author(s) 2019

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