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ERPT vs Path Tracing on GPU

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Published on Jul 12, 2010

This video shows a GPU path tracer and ERPT in the Brigade engine. Two scenes are shown, one small scene containing various caustics, and the Sponza atrium. Both scenes are first shown using normal path tracing and then using ERPT. Notice the difference in convergence and noise patterns. The demo system contained a NVIDIA GeForce GTX470.

After some complains pointing out that in the movie, ERPT is significantly darker then path tracing , I fixed the darkening effect of the ERPT image filter, solving the difference in lighting quality. I made an image ( http://img844.imageshack.us/img844/72... ) using ERPT for the left half, while using path tracing for the right half and waited until the path tracing noise almost vanished. As you can see, the lighting quality between the left and right half is pretty much the same. (The performance and convergence characteristics remain unchanged)

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