Neural Radiance Cache
The Neural Radiance Cache (NRC) allows for faster noise resolution by using a neural network that is trained at render time. This is especially useful in scenes with indirect lighting where many rays might not reach the camera. In figure 1, the render on the left does not have the NCR activated (Path Tracing, 500 samples, 6 seconds) and the render on the right has NCR activated (Path Tracing, 500 samples, 3 seconds).
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Neural Radiance Cache
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Figure 1: Comparing Neural Radiance Cache renders