WIP: Volume Scattering Probability Guiding #21
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…sed). The type can be configured using FieldConfig::SetVarianceBasedVSP()
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This PR adds experimental support for Volume Scattering Probability Guiding (VSPG).
https://kehanxuuu.github.io/vspg-website/
VSPG is the result of a collaborative research project (Intel, ETH Zurich, Disney Research Zurich) and allows to guide the binary decision to scatter inside a volume or at the closest surface inside or behind the volume.
Guiding this simple decision can lead to a significant variance reduction (see image):
Opens: