Next GPU and Volume Grid VDB Artifacts?

[mitchgates]

I'm doing some tests using the Disney cloud vdb sample and finding that when I create several copies of the same vray volume grid and rendering using Next GPU there are some strange artifacts. If I render via Next CPU it looks fine, but takes forever

The error looks like squares patches where the illumination or showing isn't correct. Any ideas?

[mitchgates]

Single cloud renders fine. 2 or more start showing the issue.

[mitchgates]

The artifact doesn't show up during the lightcache phase, only during final render. The dark squares are also in the alpha.

[psanitra]

In case you copied/offset them only XY axis, try to offset a bit in Z too, there was similar issue reported recently..

[mitchgates]

Boom! That was it. Thanks for the tip.