Practical Rendering of Thin Layered Materials with Extended Microfacet Normal Distributions

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dc.contributor.authorGuo, Jieen_US
dc.contributor.authorQian, Jinghuien_US
dc.contributor.authorPan, Jinguien_US
dc.contributor.editorJaakko Lehtinen and Derek Nowrouzezahraien_US
dc.date.accessioned2015-06-23T05:04:16Z
dc.date.available2015-06-23T05:04:16Z
dc.date.issued2015en_US
dc.description.abstractWe propose a practical reflectance model for rendering thin transparent layers with different sides varying in roughness and levels of gloss. To capture the effect of subsurface reflection, previous methods rely on importance sampling for each light-surface interaction. This soon becomes a computationally demanding task since a recursive sampling scheme is required to handle multiple internal reflections. In this paper, we first provide a comprehensive analysis of the relationship between the directional distribution of scattered light and the roughness of each layer boundary using joint spherical warping. Based on the analysis, we generalize the traditional microfacet theory for layered materials and introduce the extended normal distribution function (ENDF) to accurately model the behavior of subsurface reflection. With the ENDF, the number of sampling processes can be reduced to only once for each bounce of subsurface reflection. We demonstrate that our BSDF model based on the ENDF is easy to be implemented on top of Monte Carlo sampling based offline renderers and it incurs little computational overhead. Moreover, it can be also efficiently used in real-time applications with the help of GPU acceleration.en_US
dc.description.sectionheadersMaterial Appearanceen_US
dc.description.seriesinformationEurographics Symposium on Rendering - Experimental Ideas & Implementationsen_US
dc.identifier.doi10.2312/sre.20151162en_US
dc.identifier.pages9-20en_US
dc.identifier.urihttps://doi.org/10.2312/sre.20151162en_US
dc.publisherThe Eurographics Associationen_US
dc.subjectI.3.7 [Computer Graphics]en_US
dc.subjectThree Dimensional Graphics and Realismen_US
dc.subjectColoren_US
dc.subjectshadingen_US
dc.subjectshadowingen_US
dc.subjectand textureen_US
dc.titlePractical Rendering of Thin Layered Materials with Extended Microfacet Normal Distributionsen_US
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