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I've posted a similar problem before but it was in vray advanced. Now i have something similar but it's in vray GPU. The scene is very simple, self ilum object and a reflective plane with GGX 0.9. At around 15-20seconds the image is pretty much clean except for these edges below, where random pixels keep appearing and dissapearing. I have to wait until 1m30 or 2min for it to kind of clean up.
From 15seconds to 1m30 is a BIG difference for just those pixels, my guess is the way how vray sampling works. Did something similar with Octane and the noise distribution is pretty even, and i get a clean result in 40 seconds. If it wasn't for these random pixels, vray could be 2x faster than octane in this case. Vray's sampling seems to be "smarter" but i wonder if there's any way to clean up those sampling edges?
Image with issue:
This seems to be more of an issue with GGX tailoff than other brdf's. GGX even at 2min there's noisy fireflies. Ward cleans-up better and faster at 50s, Blinn at 25s. All with similar glossiness values.
From 15seconds to 1m30 is a BIG difference for just those pixels, my guess is the way how vray sampling works. Did something similar with Octane and the noise distribution is pretty even, and i get a clean result in 40 seconds. If it wasn't for these random pixels, vray could be 2x faster than octane in this case. Vray's sampling seems to be "smarter" but i wonder if there's any way to clean up those sampling edges?
Image with issue:
This seems to be more of an issue with GGX tailoff than other brdf's. GGX even at 2min there's noisy fireflies. Ward cleans-up better and faster at 50s, Blinn at 25s. All with similar glossiness values.
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