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Even with the advent of hardware‐accelerated ray tracing in modern GPUs, only a small number of rays can be traced at each pixel in real‐time applications. This presents a significant challenge for path tracing, even when augmented with state‐of‐the art denoising algorithms. While the recently‐developed ReSTIR algorithm [BWP∗20] enables high‐quality renderings of scenes with millions of light sources using just a few shadow rays at each pixel, there remains a need for effective algorithms to sample indirect illumination.

We introduce an effective path sampling algorithm for indirect lighting that is suitable to highly parallel GPU architectures. Building on the screen‐space spatio‐temporal resampling principles of ReSTIR, our approach resamples multi‐bounce indirect lighting paths obtained by path tracing. Doing so allows sharing information about important paths that contribute to lighting both across time and …