Artifacts with Sobol Sampler

mmp / pbrt-v3

Source code for pbrt, the renderer described in the third edition of "Physically Based Rendering: From Theory To Implementation", by Matt Pharr, Wenzel Jakob, and Greg Humphreys.

http://pbrt.org

BSD 2-Clause "Simplified" License

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Artifacts with Sobol Sampler #236

Closed gonsolo closed 5 years ago

gonsolo commented 5 years ago

I am seeing some artifacts with the Sobol sampler with 32 samples per pixel. They disappear at 64spp. Is this inherent in the Sobol sampler or just a bug? See the attached zip with the scene and two images.

sobol

bug.zip

mmp commented 5 years ago

That's a known issue with the Sobol sampler: that it has structured artifacts like that before convergence. Here's another illustration.