[VrayProxy] Artifacts when Camera MotionBlur is ON and VrayDisplacement is ON

[tdugard]

Hello Chaos Team !

Here at Capsule Studio we recently move our pipeline of Point Cached asset to Alembic cache. To load those cache we used VrayProxies because it contains all ancestors (in opposite of 3dsmax Alembic loader) so if one object is cached to disk, one object is loaded. But during the last project we have faced a really annoying issue :
If the motion blur is activated on the Physical Camera and the VrayDisplacementMod is activated on the object it produce at rendertime some big articfacts (it's not always the case).

I've made a video to explain the problem (with a side by side with the 3dsmax alembic container) and a test scene for you to spot the issue :
https://drive.google.com/file/d/1SJB...usp=share_link

And here is the test scene to reproduce the issue :
https://drive.google.com/file/d/1r-8...usp=share_link

Hope you'll find the issue because the vrayproxy abc loader is great and we really need it in our pipeline.

Using : 3dsmax 2023.1 and Vray 5 update 2.3

Thanks.

[hermit.crab]

Thank you for the report. Not exactly sure what's going on yet, but the issue seems to be present in 3ds Max only. Rendering in Standalone seems to yield correct results and you can use it as a workaround. Meanwhile, I'll continue debugging and report back with more information.

[tdugard]

Thanks it'll be great if you could hotfix the vray 5.0. Can't render in standalone mode because converting whole scene with animated hirez character is really to long.

[hermit.crab]

FYI, I've logged the issue (internal bug-tracker id: VMAX-12836) for developer investigation.

[tdugard]

Thanks can't wait for the fix, our entire pipeline is based on vrayproxies.

[hermit.crab]

It turns out the issue was already fixed in V-Ray, however, we've cherry-picked the fix for the V-Ray 5 stable nightly builds. Install it and give it a try.

[tdugard]

It's working perfectly, thanks for the Vray 5 users with the nightly build. Have a nice day !