BRDF Importance Sampling for Linear Lights

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Date
2021
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Publisher
The Eurographics Association and John Wiley & Sons Ltd.
Abstract
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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@article{
10.1111:cgf.14379
, journal = {Computer Graphics Forum}, title = {{
BRDF Importance Sampling for Linear Lights
}}, author = {
Peters, Christoph
}, year = {
2021
}, publisher = {
The Eurographics Association and John Wiley & Sons Ltd.
}, ISSN = {
1467-8659
}, DOI = {
10.1111/cgf.14379
} }
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