Probabilistic Connections for Bidirectional Path Tracing

@article{Popov2015ProbabilisticCF,
  title={Probabilistic Connections for Bidirectional Path Tracing},
  author={Stefan Popov and Ravi Ramamoorthi and Fr{\'e}do Durand and George Drettakis},
  journal={Comput. Graph. Forum},
  year={2015},
  volume={34},
  pages={75-86}
}
Bidirectional path tracing (BDPT) with Multiple Importance Sampling is one of the most versatile unbiased rendering algorithms today. BDPT repeatedly generates sub-paths from the eye and the lights, which are connected for each pixel and then discarded. Unfortunately, many such bidirectional connections turn out to have low contribution to the solution. Our key observation is that we can importance sample connections to an eye sub-path by considering multiple light sub-paths at once and… CONTINUE READING
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