Practical Multiple Scattering for Rough Surfaces

Lee, J.H. ; Jarabo, A. (Universidad de Zaragoza) ; Jeon, D.S. ; Gutierrez, D. (Universidad de Zaragoza) ; Kim, M.H.
Practical Multiple Scattering for Rough Surfaces
Financiación H2020 / H2020 Funds
Resumen: Microfacet theory concisely models light transport over rough surfaces. Specular reflection is the result of single mirror reflections on each facet, while exact computation of multiple scattering is either neglected, or modeled using costly importance sampling techniques. Practical but accurate simulation of multiple scattering in microfacet theory thus remains an open challenge. In this work, we revisit the traditional V-groove cavity model and derive an analytical, cost-effective solution for multiple scattering in rough surfaces. Our kaleidoscopic model is made up of both real and virtual V-grooves, and allows us to calculate higher-order scattering in the microfacets in an analytical fashion. We then extend our model to include nonsymmetric grooves, allowing for additional degrees of freedom on the surface geometry, improving multiple reflections at grazing angles with backward compatibility to traditional normal distribution functions. We validate the accuracy of our model against ground-truth Monte Carlo simulations, and demonstrate its flexibility on anisotropic and textured materials. Our model is analytical, does not introduce significant cost and variance, can be seamless integrated in any rendering engine, preserves reciprocity and energy conservation, and is suitable for bidirectional methods.
Idioma: Inglés
DOI: 10.1145/3272127.3275016
Año: 2018
Publicado en: ACM TRANSACTIONS ON GRAPHICS 37, 6 (2018), 275 [12 pp]
ISSN: 0730-0301

Factor impacto JCR: 6.495 (2018)
Categ. JCR: COMPUTER SCIENCE, SOFTWARE ENGINEERING rank: 1 / 107 = 0.009 (2018) - Q1 - T1
Factor impacto SCIMAGO: 2.272 - Computer Graphics and Computer-Aided Design (Q1)

Financiación: info:eu-repo/grantAgreement/EC/H2020/682080/EU/Intuitive editing of visual appearance from real-world datasets/CHAMELEON
Financiación: info:eu-repo/grantAgreement/ES/MINECO/TIN2016-78753-P
Tipo y forma: Article (PostPrint)
Área (Departamento): Área Lenguajes y Sistemas Inf. (Dpto. Informát.Ingenie.Sistms.)

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