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ReSTIR PT Enhanced: Algorithmic Advances for Faster and More Robust ReSTIR Path Tracing

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Daqi Lin, Markus Kettunen, Chris Wyman

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ReSTIR PT Enhanced: Algorithmic Advances for Faster and More Robust ReSTIR Path Tracing is a 2026 Symposium on Interactive 3D Graphics and Games best paper by Daqi Lin, Markus Kettunen, and Chris Wyman from NVIDIA real-time graphics research. It focuses on implementation-ready improvements to ReSTIR path tracing rather than purely theoretical resampling variants.

Reported gains include roughly 2 - 3x speedups with lower visual and numerical error through reciprocal neighbor selection, footprint-based shift reconnection criteria, duplication maps to reduce spatiotemporal correlation, unified direct and global illumination reservoirs, and bundled noise reduction for color and disocclusion artifacts.

Real-time ray and path tracing engineers integrating ReSTIR PT into production-style renderers are the core audience. Strong familiarity with ReSTIR reservoirs, shift mappings, and path replay is assumed.

The publication page on NVIDIA Research links PDF, supplementary material, and video openly. The authors' prior ReSTIR PT and GI papers are widely cited in real-time path tracing engineering talks.

Link last verified accessible on 2026-09-28.