Motion blur error using alembic cache file

[joa_grilo]

Hi,
i'm getting certain frames of an animation rendering with motion blur error.
And its just those frames, if i repeat the render it renders them wrong again.

Is it a alembic thing?
Or my Vray version bug?
Vray 2.30.02 for maya

Thanks

[t.petrov]

Can you give us the file, so we can look at it?
Have you tried 2.40?

[ivaylo.ivanov]

You mean from Pipeline Cache->Alembic Cache->Import Alembic?

[joa_grilo]

Hi, yes it's using the alembic cache .
Its work really good, until I use vray motion blur.
I cant try 2.4 now, we have a lot work to finish before changing to 2.4.
Probably i will try to export a new file again to see if its a exporter problem.

pretov i will send you the file.

Thanks.

[joa_grilo]

Here's the files.
Scene file and the cached alembic
https://www.wetransfer.com/downloads...2224036/2ae60f

[Morbid Angel]

looks like the issue is in subframe sampling. If you turn up the geo sampling in motion blur to something like 6, it looks better. I would suggest for fast moving objects to cache them with subframe sample interval of 0.25 or at least 0.5, this should work properly then.

[joa_grilo]

Thanks i will give it a try!