Additional Progress Towards the Unification of Microfacet and Microflake Theories

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dc.contributor.authorDupuy, Jonathanen_US
dc.contributor.authorHeitz, Ericen_US
dc.contributor.authord'Eon, Eugeneen_US
dc.contributor.editorElmar Eisemann and Eugene Fiumeen_US
dc.date.accessioned2016-06-17T14:12:42Z
dc.date.available2016-06-17T14:12:42Z
dc.date.issued2016en_US
dc.description.abstractWe study the links between microfacet and microflake theories from the perspective of linear transport theory. In doing so, we gain additional insights, find several simplifications and touch upon important open questions as well as possible paths forward in extending the unification of surface and volume scattering models. First, we introduce a semi-infinite homogeneous exponential-free-path medium that (a) produces exactly the same light transport as the Smith microsurface scattering model and the inhomogeneous Smith medium that was recently introduced by Heitz et al, and (b) allows us to rederive all the Smith masking and shadowing functions in a simple way. Second, we investigate in detail what new aspects of linear transport theory enable a volume to act like a rough surface. We show that this is mostly due to the use of non-symmetric distributions of normals and explore how the violation of this symmetry impacts light transport within the microflake volume without breaking global reciprocity. Finally, we argue that the surface profiles that would be consistent with very rough Smith microsurfaces have geometrically implausible shapes. To overcome this, we discuss an extension of Smith theory in the volume setting that includes NDFs on the entire sphere in order to produce a single unified reflectance model capable of describing everything from a smooth flat mirror all the way to a semi-infinite isotropically scattering medium with both low and high roughness regimes in between.en_US
dc.description.sectionheadersMaterials at all Scalesen_US
dc.description.seriesinformationEurographics Symposium on Rendering - Experimental Ideas & Implementationsen_US
dc.identifier.doi10.2312/sre.20161210en_US
dc.identifier.isbn978-3-03868-019-2en_US
dc.identifier.issn1727-3463en_US
dc.identifier.pages55-63en_US
dc.identifier.urihttps://doi.org/10.2312/sre.20161210en_US
dc.publisherThe Eurographics Associationen_US
dc.subjectI.3.7 [Computer Graphics]en_US
dc.subjectThree Dimensional Graphics and Realismen_US
dc.subjectKeywordsen_US
dc.subjectMicrofacet theoryen_US
dc.subjectBRDFen_US
dc.subjectBSDFen_US
dc.subjectmultiple scatteringen_US
dc.subjectanisotropic mediaen_US
dc.titleAdditional Progress Towards the Unification of Microfacet and Microflake Theoriesen_US
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Rendering - Experimental Ideas & Implementations 2016