Exploiting Visibility Correlation in Direct Illumination

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dc.contributor.authorClarberg, Petriken_US
dc.contributor.authorAkenine-Moeller, Tomasen_US
dc.date.accessioned2015-02-21T17:05:45Z
dc.date.available2015-02-21T17:05:45Z
dc.date.issued2008en_US
dc.description.abstractThe visibility function in direct illumination describes the binary visibility over a light source, e.g., an environment map. Intuitively, the visibility is often strongly correlated between nearby locations in time and space, but exploiting this correlation without introducing noticeable errors is a hard problem. In this paper, we first study the statistical characteristics of the visibility function. Then, we propose a robust and unbiased method for using estimated visibility information to improve the quality of Monte Carlo evaluation of direct illumination. Our method is based on the theory of control variates, and it can be used on top of existing state-of-the-art schemes for importance sampling. The visibility estimation is obtained by sparsely sampling and caching the 4D visibility field in a compact bitwise representation. In addition to Monte Carlo rendering, the stored visibility information can be used in a number of other applications, for example, ambient occlusion and lighting design.en_US
dc.description.number4en_US
dc.description.seriesinformationComputer Graphics Forumen_US
dc.description.volume27en_US
dc.identifier.doi10.1111/j.1467-8659.2008.01250.xen_US
dc.identifier.issn1467-8659en_US
dc.identifier.pages1125-1136en_US
dc.identifier.urihttps://doi.org/10.1111/j.1467-8659.2008.01250.xen_US
dc.publisherThe Eurographics Association and Blackwell Publishing Ltden_US
dc.titleExploiting Visibility Correlation in Direct Illuminationen_US
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27-Issue 4
EGSR08: 19th Eurographics Symposium on Rendering