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Efficient rendering of layered materials using an atomic decomposition with statistical operators

Published: 30 July 2018 Publication History

Abstract

We derive a novel framework for the efficient analysis and computation of light transport within layered materials. Our derivation consists in two steps. First, we decompose light transport into a set of atomic operators that act on its directional statistics. Specifically, our operators consist of reflection, refraction, scattering, and absorption, whose combinations are sufficient to describe the statistics of light scattering multiple times within layered structures. We show that the first three directional moments (energy, mean and variance) already provide an accurate summary. Second, we extend the adding-doubling method to support arbitrary combinations of such operators efficiently. During shading, we map the directional moments to BSDF lobes. We validate that the resulting BSDF closely matches the ground truth in a lightweight and efficient form. Unlike previous methods we support an arbitrary number of textured layers, and demonstrate a practical and accurate rendering of layered materials with both an offline and real-time implementation that are free from per-material precomputation.

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    Published In

    cover image ACM Transactions on Graphics
    ACM Transactions on Graphics  Volume 37, Issue 4
    August 2018
    1670 pages
    ISSN:0730-0301
    EISSN:1557-7368
    DOI:10.1145/3197517
    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 the author(s) 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: 30 July 2018
    Published in TOG Volume 37, Issue 4

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    Author Tags

    1. layered materials
    2. real-time rendering
    3. statistical analysis

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    • (2024)RNA: Relightable Neural AssetsACM Transactions on Graphics10.1145/369586644:1(1-19)Online publication date: 12-Sep-2024
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