BRDF Importance Sampling for Linear Lights

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 p...

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Bibliographic Details
Published inComputer graphics forum Vol. 40; no. 8; pp. 31 - 39
Main Author Peters, Christoph
Format Journal Article
LanguageEnglish
Published Oxford Blackwell Publishing Ltd 01.12.2021
Subjects
Categories and Subject Descriptors (according to ACM CCS): I.3.7 [Computer Graphics]: Three‐Dimensional Graphics and Realism—Color, shading, shadowing, and texture
Importance sampling
Sampling methods
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Summary: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.
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ISSN:0167-7055
1467-8659
DOI:10.1111/cgf.14379