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I have this weird problem with noise coming from gi, when seen behind more than one refractive object, which seems to be related to the way vray automatically adjusts subdivisions. assuming brute force subdivisions are controlled as materials and lights are.
in a simple scene a set up the three boxes are behind, from left to right, a single glass plane (though not really a plane as it has thickness), then two and three. what's seen through refraction is sampled consistently in the first two cases, but not the last one. with default settings, even raising the msr to very high values doesn't make any difference. what I found does clear the noise, is checking use local subdivisions and manually adjust the gi ones. once I've done that, even reverting to automatic renders correctly.
I thought vray would take care of all subdivisions when use local is unchecked, and that the msr would globally control them. as weird and uncommon as it may be, in this case it doesn't seem to work.
or quite possibly is me doing something stupid or overlooking something...
in the first two images noise won't go away raising the msr, last two have use local checked and gi adjusted manually.
vray version is 3.30.04
in a simple scene a set up the three boxes are behind, from left to right, a single glass plane (though not really a plane as it has thickness), then two and three. what's seen through refraction is sampled consistently in the first two cases, but not the last one. with default settings, even raising the msr to very high values doesn't make any difference. what I found does clear the noise, is checking use local subdivisions and manually adjust the gi ones. once I've done that, even reverting to automatic renders correctly.
I thought vray would take care of all subdivisions when use local is unchecked, and that the msr would globally control them. as weird and uncommon as it may be, in this case it doesn't seem to work.
or quite possibly is me doing something stupid or overlooking something...
in the first two images noise won't go away raising the msr, last two have use local checked and gi adjusted manually.
vray version is 3.30.04
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