Overview
- Nvidia published a research paper on ReSTIR PT Enhanced that targets faster real-time path tracing and describes the work as closer to production-ready.
- Tests on a workstation-class RTX 5880 across four scenes showed an average 2.74x speedup, with results ranging from 2.08x to 3.05x over the original ReSTIR.
- The method halves spatial reuse cost and introduces reciprocal neighbor selection, adaptive ray-footprint thresholds, sample-duplication maps, and a unified path for direct and indirect lighting.
- Low-level GPU changes increased SM warp occupancy and active threads per warp and cut warp latency, which points to reduced thread divergence during rendering.
- Compressed and unified reservoirs lowered 1080p ReSTIR memory use from 431 MB to 265 MB in the tested implementation.