Hard to track down render error. Disappearing geo.

[Jim Meston]

We have a major issue with current scene, where when one object display is switched on, it makes another object corrupt or not render correctly (half the geo disappears).

See vid.
https://drive.google.com/file/d/1w3z...ew?usp=sharing

Any thoughts much appreciated.

[Gosho.Genchev]

Huh, that's interesting.

Seems like the bounding box fo "geo_animated" is cutting "meshed_sim".
1. Are there any V-Ray Clippers in this scene?
2. Are those files cached to Alembic or is it live geometry?
3. Any chance you could share a single frame cache with me?

If I had the file with me, I'd add a new Renderer, go to the Objects tab and disable the export of both lights and geometry(clear the * in Candidate Objects/Lights), and only force those two nodes + a default dome light (with Force Objects/Lights lists). -> Render
Then override their materials with a default clay material. -> Render
If the problem is still there, I'd disable motion blur, -> Render
then set the Alembic mode to Unpacked so it's treated as a live mesh. -> Render

If you can't share the file, could you please check if any of those steps above fix the problem?

Best regards!

[Jim Meston]

I will email you the link !

[Jim Meston]

1. No I am sure there are not.
2. Live geo.
3. Email sent with link (250+mb)

If you have any thoughts when you look at the file, please do share them ... we are under pressure!!!

[Gosho.Genchev]

Hey Jim Meston ,

At the moment I'm not certain what the root cause of the issue is but adding V-Ray Object Properties and setting the Geometry Type to Static seems to resolve the problem. It certainly appears as a bug so I'm logging it for the dev team and will message back once resolved.

Best regards!

[Jim Meston]

Great news.
Thank you for taking a look at this.

Very very much appreciated.