ReSTIR

Computer Graphics · Light Transport · 2020 · also: Spatiotemporal reservoir resampling · restir.yaml

Keeps a small reservoir of chosen light samples per pixel and repeatedly resamples it against neighbours and the previous frame, so each pixel effectively inherits thousands of candidates for a handful of rays.

• supersedescorrects · extends
• classifiesspecializes · part-of
• substitutes forapproximates · alternative-to
• depends onrequires · validates

Colour is the family; a dashed line is the second member of it.

This node

• specializesis a specific case of Resampled Importance Samplingreuses candidate pools across pixels and frames
• requiresdoes not work without Temporal Reprojectionthe previous frame's reservoir must be located

Referenced by

• extendsReSTIR GI adds capability to thisreuses indirect paths, not just direct light samples

References

• Spatiotemporal Reservoir Resampling for Real-Time Ray Tracing with Dynamic Direct Lighting — Bitterli, Wyman, Pharr, Rayfield, Jarosz, Novak — 2020 · link