research-article

Microfacet BSDFs Generated from NDFs and Explicit Microgeometry

Authors:

Mickaël Ribardière,

Benjamin Bringier,

Lionel Simonot,

Daniel MeneveauxAuthors Info & Claims

ACM Transactions on Graphics (TOG), Volume 38, Issue 5

Article No.: 143, Pages 1 - 15

https://doi.org/10.1145/3338697

Published: 26 June 2019 Publication History

Abstract

Microfacet distributions are considered nowadays as a reference for physically plausible BSDF representations. Many authors have focused on their physical and mathematical correctness, while introducing means to enlarge the range of possible appearances. This article is dedicated to Normal Distribution Functions (NDFs) and the influence of their shape on the rendered material aspect. We provide a complete framework for studying the impact of NDFs on the observed Bidirectional Scattering Distribution Functions (BSDFs). To explore very general NDFs, manually controlled by the user, and including anisotropic materials, we propose to use a piecewise continuous representation. It is derived with its associated Smith shadowing-masking function and importance sampling formulations for ensuring efficient global illumination computations. A new procedure is also proposed in this article for generating an explicit geometric micro-surface, used to evaluate the validity of analytic models and multiple scattering effects. The results are produced with a computer-generated process using path tracing. They show that this generation procedure is suitable with any NDF model, independently from its shape complexity.

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Xu KCavalier ABringier BRibardière MMeneveaux D(2024)Virtually measuring layered material appearanceJournal of the Optical Society of America A10.1364/JOSAA.51460441:5(959)Online publication date: 25-Apr-2024
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Index Terms

Microfacet BSDFs Generated from NDFs and Explicit Microgeometry
1. Computing methodologies
  1. Computer graphics
    1. Rendering
      1. Reflectance modeling

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cover image ACM Transactions on Graphics

ACM Transactions on Graphics Volume 38, Issue 5

October 2019

191 pages

ISSN:0730-0301

EISSN:1557-7368

DOI:10.1145/3341165

Editor:
Marc Alexa
TU Berlin, Germany

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Publication History

Published: 26 June 2019

Accepted: 01 May 2019

Revised: 01 May 2019

Received: 01 October 2018

Published in TOG Volume 38, Issue 5

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Cited By

Xu KCavalier ABringier BRibardière MMeneveaux D(2024)Virtually measuring layered material appearanceJournal of the Optical Society of America A10.1364/JOSAA.51460441:5(959)Online publication date: 25-Apr-2024
https://doi.org/10.1364/JOSAA.514604
Cocco GZanni CChermain X(2024)Anisotropic Specular Image‐Based Lighting Based on BRDF Major Axis SamplingComputer Graphics Forum10.1111/cgf.1523343:7Online publication date: 30-Oct-2024
https://doi.org/10.1111/cgf.15233
Chermain XZanni CMartínez JHugron PLefebvre S(2023)Orientable Dense Cyclic Infill for Anisotropic Appearance FabricationACM Transactions on Graphics10.1145/359241242:4(1-13)Online publication date: 26-Jul-2023
https://dl.acm.org/doi/10.1145/3592412
d'Eon EBitterli BWeidlich AZeltner T(2023)Microfacet Theory for Non-Uniform HeightfieldsACM SIGGRAPH 2023 Conference Proceedings10.1145/3588432.3591486(1-10)Online publication date: 23-Jul-2023
https://dl.acm.org/doi/10.1145/3588432.3591486
Zou JWu SZhou L(2023)Improved normal distribution function for skin specular reflection rendering based on GGX distributionThird International Conference on Computer Graphics, Image, and Virtualization (ICCGIV 2023)10.1117/12.3008031(30)Online publication date: 14-Nov-2023
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Wang BJin WFan JYang JHolzschuch NYan L(2022)Position-free multiple-bounce computations for smith microfacet BSDFsACM Transactions on Graphics10.1145/3528223.353011241:4(1-14)Online publication date: 22-Jul-2022
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Atanasov AKoylazov VDimov RWilkie A(2022)Microsurface TransformationsComputer Graphics Forum10.1111/cgf.1459041:4(105-116)Online publication date: 30-Jul-2022
https://doi.org/10.1111/cgf.14590
Zhang XXu F(2022)Coherent Spatially Varying Bidirectional Scattering Distribution Function of Rough SurfaceIEEE Transactions on Geoscience and Remote Sensing10.1109/TGRS.2021.313657260(1-17)Online publication date: 2022
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