Vray Artefacts

[Pacifa]

Hello everyone,

We have a serious issue regarding our rendered images. It happens randomly and not everytime on the same server or the same image but as you can see we have some artefacts that seem "unprocessed" but the image is saved and finished.

This is the first time this kind of issue happens on our projets. I tried to look around on the internet or the forum but I didn't find anything close to this problem.

Did anyone already experience this kind of bug?

Thank's in advance

ps : Vray 3.5, 3DSmax 2014

[Svetlozar Draganov]

Is this image rendered on a single machine only or on multiple machines with V-Ray Distrubuted Rendering enabled?

[Pacifa]

It has been rendered on only one machine. We do not use distributed rendering yet

[Pacifa]

We managed to fix this issue by going back to an older Vray (3.2 actually). We also think this might have been caused by upgrading our whole farm (Vray 3.2 to 3.5) while we were making this scene.

[Svetlozar Draganov]

The scene was build with 3.2 but when rendered with 3.5 it gives those artifacts?
This might be a bug, are you able to replicate it each time?
Is there a chance to send us the scene for investigation?

[Pacifa]

Yes I think this might have been caused by openning our scene after the upgrade and ticking "yes" (when vray asked to modify the parameters to the new version). We couldn't replicate it since it was very random. For instance, we have 18 machines and we rendered 200 frames two times (2 productions). The artefacts did not appear on the same frames or the same machines on our two productions.

Unfortunately I am not allowed to share my scene since we work with NDA.

Regards

[Svetlozar Draganov]

We could sign NDA as well, that shouldn't be a problem but since it is a random issue I don't know how much time it will take to replicate it here.
Have you got some render elements exported, would be a good idea to know in which one the artifacts are more prominent?

[vlado]

Please update to V-Ray 3.50.04 and check if the problem is still there.

Best regards,
Vlado