000085404 001__ 85404 000085404 005__ 20200117221630.0 000085404 0247_ $$2doi$$a10.1145/3272127.3275016 000085404 0248_ $$2sideral$$a110533 000085404 037__ $$aART-2018-110533 000085404 041__ $$aeng 000085404 100__ $$aLee, J.H. 000085404 245__ $$aPractical Multiple Scattering for Rough Surfaces 000085404 260__ $$c2018 000085404 5060_ $$aAccess copy available to the general public$$fUnrestricted 000085404 5203_ $$aMicrofacet 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. 000085404 536__ $$9info:eu-repo/grantAgreement/EC/H2020/682080/EU/Intuitive editing of visual appearance from real-world datasets/CHAMELEON$$9This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 682080-CHAMELEON$$9info:eu-repo/grantAgreement/ES/MINECO/TIN2016-78753-P 000085404 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/ 000085404 590__ $$a6.495$$b2018 000085404 591__ $$aCOMPUTER SCIENCE, SOFTWARE ENGINEERING$$b1 / 107 = 0.009$$c2018$$dQ1$$eT1 000085404 592__ $$a2.272$$b2018 000085404 593__ $$aComputer Graphics and Computer-Aided Design$$c2018$$dQ1 000085404 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion 000085404 700__ $$0(orcid)0000-0001-9000-0466$$aJarabo, A.$$uUniversidad de Zaragoza 000085404 700__ $$aJeon, D.S. 000085404 700__ $$0(orcid)0000-0002-7503-7022$$aGutierrez, D.$$uUniversidad de Zaragoza 000085404 700__ $$aKim, M.H. 000085404 7102_ $$15007$$2570$$aUniversidad de Zaragoza$$bDpto. Informát.Ingenie.Sistms.$$cÁrea Lenguajes y Sistemas Inf. 000085404 773__ $$g37, 6 (2018), 275 [12 pp]$$pACM trans. graph.$$tACM TRANSACTIONS ON GRAPHICS$$x0730-0301 000085404 8564_ $$s670573$$uhttps://zaguan.unizar.es/record/85404/files/texto_completo.pdf$$yPostprint 000085404 8564_ $$s88493$$uhttps://zaguan.unizar.es/record/85404/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint 000085404 909CO $$ooai:zaguan.unizar.es:85404$$particulos$$pdriver 000085404 951__ $$a2020-01-17-21:59:17 000085404 980__ $$aARTICLE