We describe a hybrid rendering approach that leverages existing rasterizationbased techniques and combines them with ray tracing in order to achieve realtime global illumination. We reduce the number of traced rays by trying to find an intersection in screen space and reuse information from previous frames via reprojection and filtering. Artificial lighting is stored in nodes of the spatial acceleration structure to ensure efficient memory access. Our techniques require no manual preprocessing and only a few seconds of precomputation. They were developed as a real-time rendering solution for architectural design but can be applied to other purposes as well.
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