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BRDF Importance Sampling for Linear Lights

Peters, Christoph


We introduce an efficient method to sample linear lights, i.e. infinitesimally thin cylinders, proportional to projected solid angle. Our method uses inverse function sampling with a specialized iterative procedure that converges to high accuracy in only two iterations. It also allows us to sample proportional to a linearly transformed cosine. By combining both sampling techniques through suitable multiple importance sampling heuristics and by using good stratification, we achieve unbiased diffuse and specular real-time shading with low variance outside penumbrae at two samples per pixel. Additionally, we provide a fast method for solid angle sampling.

Verlagsausgabe §
DOI: 10.5445/IR/1000137268/pub
Veröffentlicht am 21.10.2022
Postprint §
DOI: 10.5445/IR/1000137268
Veröffentlicht am 19.06.2022
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Visualisierung und Datenanalyse (IVD)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 06.07.2021
Sprache Englisch
Identifikator ISSN: 0167-7055, 1467-8659
KITopen-ID: 1000137268
Erschienen in Computer graphics forum
Verlag John Wiley and Sons
Band 40
Heft 8
Seiten 31-40
Vorab online veröffentlicht am 18.06.2021
Schlagwörter real-time rendering, ray tracing, linear lights, light sampling
Nachgewiesen in Dimensions
Web of Science
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