Correlated visibility sampling for direct illumination

Abhijeet Ghosh*, Wolfgang Heidrich

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


State-of-the-art importance sampling strategies for direct illumination take into account the importance of the incident illumination, as well as the surface BRDF. Hence, these techniques achieve low variance in unoccluded regions. However, the resulting images still have noise in partially occluded regions as these techniques do not take visibility into account during the sampling process. We introduce the notion of correlated visibility sampling, which considers visibility in partially occluded regions during the sampling process, thereby improving the quality of the shadowed regions. We aim to draw samples in the partially occluded regions according to the triple product of the incident illumination, BRDF and visibility using Monte Carlo sampling followed by Metropolis sampling.

Original languageEnglish (US)
Pages (from-to)693-701
Number of pages9
JournalVisual Computer
Issue number9-11
StatePublished - Sep 2006
Externally publishedYes


  • Monte Carlo techniques
  • Ray tracing

ASJC Scopus subject areas

  • Software
  • Computer Vision and Pattern Recognition
  • Computer Graphics and Computer-Aided Design


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