Publications

(* as Join First Authors)

2025

Many-Light Rendering Using ReSTIR-Sampled Shadow Maps (to appear in Eurographics 2025)

Song Zhang, Daqi Lin, Chris Wyman, and Cem Yuksel

In , 2025

Abs

We present a practical method targeting dynamic shadow maps for many light sources in real-time rendering. We compute full-resolution shadow maps for a subset of lights, which we select with spatiotemporal reservoir resampling (ReSTIR). Our selection strategy automatically regenerates shadow maps for lights with the strongest contributions to pixels in the current camera view. The remaining lights are handled using imperfect shadow maps, which provide low-resolution shadow approximation. We significantly reduce the computation and storage compared to using all full-resolution shadow maps and substantially improve shadow quality compared to handling all lights with imperfect shadow maps.

2024

Area ReSTIR: Resampling for Real-Time Defocus and Antialiasing

Song Zhang^*, Daqi Lin^*, Markus Kettunen, Cem Yuksel, and Chris Wyman

ACM Transactions on Graphics (Proceedings of SIGGRAPH 2024), 2024

Abs DOI PDF Code Website

Recent advancements in spatiotemporal reservoir resampling (ReSTIR) leverage sample reuse from neighbors to efficiently evaluate the path integral. Like rasterization, ReSTIR methods implicitly assume a pinhole camera and evaluate the light arriving at a pixel through a single predetermined subpixel location at a time (e.g., the pixel center). This prevents efficient path reuse in and near pixels with high-frequency details.We introduce Area ReSTIR, extending ReSTIR reservoirs to also integrate each pixel’s 4D ray space, including 2D areas on the film and lens. We design novel subpixel-tracking temporal reuse and shift mappings that maximize resampling quality in such regions. This robustifies ReSTIR against high-frequency content, letting us importance sample subpixel and lens coordinates and efficiently render antialiasing and depth of field.