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SIGGRAPH 2019: Real-Time Ray Tracing - Special Topics and Latest Resarch- Ray-Traced Global Illumination for Games: Massively Parallel Path Space Filtering

Alex Keller, NVIDIA
Restricting path tracing to a small number of paths per pixel for performance reasons rarely achieves a satisfactory image quality. Using a hash map, we greatly improve the performance of path space filtering, yielding a dramatically better visual quality at interactive frame rates.

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