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dc.contributor.authorGamboa, Luis E.en_US
dc.contributor.authorGruson, Adrienen_US
dc.contributor.authorNowrouzezahrai, Dereken_US
dc.contributor.editorPanozzo, Daniele and Assarsson, Ulfen_US
dc.date.accessioned2020-05-24T12:52:31Z
dc.date.available2020-05-24T12:52:31Z
dc.date.issued2020
dc.identifier.issn1467-8659
dc.identifier.urihttps://doi.org/10.1111/cgf.13936
dc.identifier.urihttps://diglib.eg.org:443/handle/10.1111/cgf13936
dc.description.abstractLayered materials capture subtle, realistic reflection behaviors that traditional single-layer models lack. Much of this is due to the complex subsurface light transport at the interfaces of - and in the media between - layers. Rendering with these materials can be costly, since we must simulate these transport effects at every evaluation of the underlying reflectance model. Rendering an image requires thousands of such evaluations, per pixel. Recent work treats this complexity by introducing significant approximations, requiring large precomputed datasets per material, or simplifying the light transport simulations within the materials. Even the most effective of these methods struggle with the complexity induced by high-frequency variation in reflectance parameters and micro-surface normal variation, as well as anisotropic volumetric scattering between the layer interfaces. We present a more efficient, unbiased estimator for light transport in such general, complex layered appearance models. By conducting an analysis of the types of transport paths that contribute most to the aggregate reflectance dynamics, we propose an effective and unbiased path sampling method that reduces variance in the reflectance evaluations. Our method additionally supports reflectance importance sampling, does not rely on any precomputation, and so integrates readily into existing renderers. We consistently outperform the state-of-the-art by ~2-6x in equal-quality (i.e., equal error) comparisons.en_US
dc.publisherThe Eurographics Association and John Wiley & Sons Ltd.en_US
dc.rightsAttribution 4.0 International License
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectComputing methodologies
dc.subjectRendering
dc.titleAn Efficient Transport Estimator for Complex Layered Materialsen_US
dc.description.seriesinformationComputer Graphics Forum
dc.description.sectionheadersRay Tracing and Global Illumination
dc.description.volume39
dc.description.number2
dc.identifier.doi10.1111/cgf.13936
dc.identifier.pages363-371


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Attribution 4.0 International License
Except where otherwise noted, this item's license is described as Attribution 4.0 International License