A Discrete Polydisperse Anisotropic BSDF Model based on the Micrograin Framework

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dc.contributor.authorXu, Kewei
dc.contributor.authorLucas, Simon
dc.contributor.authorRibardière, Mickael
dc.contributor.authorBringier, Benjamin
dc.contributor.authorBarla, Pascal
dc.contributor.editorMasia, Belen
dc.contributor.editorThies, Justus
dc.date.accessioned2026-04-17T13:50:56Z
dc.date.available2026-04-17T13:50:56Z
dc.date.issued2026
dc.description.abstractWe introduce a discrete polydisperse micrograin BSDF model for the rendering of porous surface materials composed of microscopic elements of different size, shape and reflectance distributed on a bulk medium. Our approach generalizes the anisotropic monodisperse micrograin model. We first reformulate it in a non-axis-aligned configuration, allowing for the later combination of different micrograin types elongated in arbitrary directions. We then extend the monodisperse model to the polydisperse case, deriving its three key components: (i) a general filling factor that controls the mix between micrograins and the bulk medium; (ii) an exact normal distribution function for surfaces composed of polydisperse micrograin distributions; and (iii) the corresponding fully-correlated shadowing and masking term. This results in an analytical single-scattering BSDF for discrete polydisperse surface materials, validated over ground truth simulations, for which we also derive a dedicated importance sampling procedure. Our model supports varying heights and anisotropy orientations of different micrograin types as input, giving additional control to simulate phenomena like retro-reflection from mixed materials, color mixture depending on lighting and observation directions, multiple directions of anisotropy, etc.
dc.description.number2
dc.description.sectionheadersMeasuring and Modeling Material Appearance
dc.description.seriesinformationComputer Graphics Forum
dc.description.volume45
dc.identifier.citationComputer Graphics Forum, Volume 45, Issue 2, e70387, 2026
dc.identifier.doi10.1111/cgf.70387
dc.identifier.issn1467-8659
dc.identifier.pages13 pages
dc.identifier.urihttps://diglib.eg.org/handle/10.1111/cgf70387
dc.identifier.urihttps://doi.org/10.1111/cgf.70387
dc.publisherThe Eurographics Association and John Wiley & Sons Ltd.
dc.rightsCC-BY-4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectCCS Concepts: Computing methodologies → Reflectance modeling
dc.titleA Discrete Polydisperse Anisotropic BSDF Model based on the Micrograin Framework
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