Two-level Radiance Caching for Fast and Scalable Real-Time Dynamic GI in Games: GI-1.0 PREVIEW
122This video shows a PREVIEW of a pre-release version of our GI-1.0 solution including a sneak peek of glossy reflections.
Real-time global illumination is key to enabling dynamic and believable game worlds. GPU-accelerated ray tracing makes this possible; however, framerate and resolution requirements limit the number of traceable rays per pixel, imposing practical limits on current hardware generations. Existing solutions, such as probe-based techniques, approximate the irradiance signal using fewer rays per frame but suffer from reduced details and slow response times to lighting changes. On the other hand, reservoir-based resampling techniques capture higher detail but typically suffer from poorer performance and increased noise.
Our presentation at the Advanced Graphics Summit during GDC 2023 introduced the practical implementation of a solution aimed at making the most of every sample by caching the estimated radiance into a cache hierarchy used for both sampling and filtering. We showed how this approach allows for highly performant, high-quality, dynamic, and leak-free global illumination without requiring any content pre-processing, thus enabling easy integration into existing real-time rendering pipelines.
Read the paper: https://gpuopen.com/download/publications/GPUOpen2022_GI1_0.pdf
Learn about AMD at GDC 2023: https://gpuopen.com/events/gdc-2023/
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