Path space filtering

Light transport simulation comprises of summing up the contributions of light transport paths that connect sensors and light sources. Such light transport paths may be sampled by following photon trajectories from the lights, tracing paths from the camera, and connecting such path segments by proximity (photon mapping) or shadow rays (both dashed in black). Smoothing the contribution of light transport paths before reconstructing the image can efficiently reduce the noise inherent to sampling.


Ken Dahm (NVIDIA)

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