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Multiple scattering from distributions of specular v-grooves

Published: 04 December 2018 Publication History

Abstract

Microfacet-based reflection models are the most common way to represent reflection from rough surfaces. However, a major current limitation of these models is that they only account for single scattering. Unfortunately, single scattering models do not preserve energy. In this paper, we develop a microfacet BRDF for specular v-grooves that includes multiple scattering. Our approach is based on previous work by Zipin, who showed that the number of reflections inside a specular v-groove is bounded and analytically computable. Using his insight, we present a closed form solution for the BRDF and its probability density function (PDF); we also present a method for importance sampling the BRDF. As a result, our BRDF can be easily used within a path-traced rendering system such as PBRT. The model supports any microfacet distribution function, and spatially-varying surface roughness. The images produced by the model have a pleasing appearance compared to traditional single-scattering models.

References

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    Published In

    cover image ACM Transactions on Graphics
    ACM Transactions on Graphics  Volume 37, Issue 6
    December 2018
    1401 pages
    ISSN:0730-0301
    EISSN:1557-7368
    DOI:10.1145/3272127
    Issue’s Table of Contents
    Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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    Publication History

    Published: 04 December 2018
    Published in TOG Volume 37, Issue 6

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    Author Tags

    1. appearance modeling
    2. microfacet distributions
    3. multiple scattering

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