research.nvidia.com/publication/hardware-accelerated-global-illumination-image-space-photon-mapping

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      Hardware-Accelerated Global Illumination by Image Space Photon Mapping | Research
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      We describe an extension to photon mapping that recasts the most expensive steps of the algorithm -- the initial and final photon bounces -- as image-space operations amenable to GPU acceleration. This enables global illumination for real-time applications as well as accelerating it for offline rendering. Image Space Photon Mapping (ISPM) rasterizes a light-space bounce map of emitted photons surviving initial-bounce Russian roulette sampling on a GPU. It then traces photons conventionally on the CPU.

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