Procedural Physically based BRDF for Real-Time Rendering of Glints |
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Authors: | X. Chermain B. Sauvage J.-M. Dischler C. Dachsbacher |
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Affiliation: | 1. ICube, Université de Strasbourg, CNRS, France;2. Institute for Visualization and Data Analysis, Karlsruhe Institute of Technology |
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Abstract: | Physically based rendering of glittering surfaces is a challenging problem in computer graphics. Several methods have proposed off-line solutions, but none is dedicated to high-performance graphics. In this work, we propose a novel physically based BRDF for real-time rendering of glints. Our model can reproduce the appearance of sparkling materials (rocks, rough plastics, glitter fabrics, etc.). Compared to the previous real-time method [ZK16], which is not physically based, our BRDF uses normalized NDFs and converges to the standard microfacet BRDF [CT82] for a large number of microfacets. Our method procedurally computes NDFs with hundreds of sharp lobes. It relies on a dictionary of 1D marginal distributions: at each location two of them are randomly picked and multiplied (to obtain a NDF), rotated (to increase the variety), and scaled (to control standard deviation/roughness). The dictionary is multiscale, does not depend on roughness, and has a low memory footprint (less than 1 MiB). |
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Keywords: | CCS Concepts • Computing methodologies → Reflectance modeling |
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