| Title: |
A Discrete Polydisperse Anisotropic BSDF Model based on the Micrograin Framework |
| Authors: |
Xu, Kewei; Lucas, Simon; Ribardière, M.; Bringier, Benjamin; Barla, Pascal |
| Contributors: |
XLIM (XLIM); Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS); Université de Bordeaux (UB); Melting the frontiers between Light, Shape and Matter (MANAO); Laboratoire Bordelais de Recherche en Informatique (LaBRI); Université de Bordeaux (UB)-École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB)-École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB)-Centre National de la Recherche Scientifique (CNRS)-Centre Inria de l'Université de Bordeaux; Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria); Université de Poitiers = University of Poitiers (UP); SIC (XLIM-SIC); Université de Poitiers = University of Poitiers (UP)-XLIM (XLIM); Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS); Synthèse et analyse d'images (XLIM-ASALI); Université de Bordeaux (UB)-École Nationale Supérieure d'Électronique, Informatique et Radiocommunications de Bordeaux (ENSEIRB)-Centre National de la Recherche Scientifique (CNRS); ANR-22-CE22-0006,REFLECTIVITY,Mesure de la BRDF des surfaces routières pour optimiser l'éclairage, le contraste des marquages, l'impact de l'albédo afin de concilier visibilité et territoire durable(2022) |
| Source: |
ISSN: 0167-7055. |
| Publisher Information: |
CCSD; Wiley |
| Publication Year: |
2026 |
| Collection: |
Université de Limoges: HAL |
| Subject Terms: |
Computer graphics; Material appearance; BRDF; Rendering; CCS Concepts • Computing methodologies → Reflectance modeling; [INFO.INFO-GR]Computer Science [cs]/Graphics [cs.GR] |
| Description: |
International audience ; We 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. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| DOI: |
10.1111/cgf.70387 |
| Availability: |
https://hal.science/hal-05574460; https://hal.science/hal-05574460v1/document; https://hal.science/hal-05574460v1/file/paper_polygrain_bsdf.pdf; https://doi.org/10.1111/cgf.70387 |
| Rights: |
https://creativecommons.org/licenses/by/4.0/ ; info:eu-repo/semantics/OpenAccess |
| Accession Number: |
edsbas.4A23690E |
| Database: |
BASE |