Vray 3.40 Gradually increased render time with each frame.

[Dini009]

We were rendering a 1500 frame sequence.

I left the server to render at night.

It started each frame on 16 sec. It went up to 2 minutes /frame.

When I restarted 3ds Max 2015 it went back to 16 sec again and with each frame rendered gradually went up again 1-2 sec/frame.

I downgraded my vray to 3.30 it does not do that any more with the same scene. Its constantly 16 - 18 sec.

Any idea what causing this?

Thanks,

Denes

[matanov]

This sounds scene related (I hope), can you upload it somewhere and share the link with me at peter.matanov@chaosgroup.com or support@chaosgroup.com ?

[vlado]

What Peter said, it would be great if you can get us some scenes. I've rendered a bunch of animations with 3.40 and things seemed fine.

Best regards,
Vlado

[Dini009]

Ahm sorry guys don't have time for that and its client's stuff I can't upload.

D

[vlado]

Ok then, if you notice it again or if you get a bit of time, let us know.

Best regards,
Vlado

[eyepiz]

I had a very similar problem with an animation on 3.4.02.

It's was something to do with the Backburner the denoiser element and a network path output combination.
The CPU usage begins to gradually throttle after beginning each frame even a single node will start to throttle the CPU over the network within seconds of starting to render a frame. I can reproduce the problem every time with backburner rendering over a network.

This does not happen with the beta build with the denioser Vlado posted or rendering locally with 3.4.02

Please look into this.

[Svetlozar Draganov]

Is there a chance to send us a reproducible scene even if it is a very very simple one?
A quick step-by-step guide to reproduce the issue will be also very helpful.

[anthonyh]

I had a similar thing with just a background image from an older file. Resetting the renderer seemed to fix it. Sent the scene in another thread. Don`t know if it`s related.
anthonyh

[EL_CISNE_POST]

I'm having the same problem, my render started at 30 mins per frame and then started to increase from that to more than 3 hours per frame. I had to open the file in one of the render servers and do the render local using the spawner from the other render servers. Now my render time is 12 (with only the local host) :/
I'm using vray denoiser on the elements so I just read that this might be a problem, haven't tried without it.

[eyepiz]

Is there a chance to send us a reproducible scene even if it is a very very simple one?
A quick step-by-step guide to reproduce the issue will be also very helpful.

any update? I sent you the scene last week.

[Svetlozar Draganov]

The scene wasn't render very fast and we needed more time to complete the test.
We did two tests actually one with UNC-path setup and another one with Mapped Drive as a D:\ drive as described in the email you sent us.
In both cases however we didn't get any slowdowns with the subsequent frames, there are some variations in both directions of course but nothing unusual.
There wasn't any CPU usage drop-downs, it was always at 100%.

Log files exported from BB of both tests could be downloaded from the links bellow (the times are in seconds unfortunately):
Mapped Network D-Drive setup: http://ftp.chaosgroup.com/support/scenes/local.txt
UNC path setup: http://ftp.chaosgroup.com/support/sc...pped_drive.txt

We do not have the following plugin so the tests were executed without it. Does the issue exists into your environment if this plugin does not exist?

May be we are missing something, or maybe the missing plugin is causing that issue, that's why it is important to run a test with and without it and see if there is any difference.

The scene is not using V-Ray DR and you didn't mentioned anything about it, have you noticed if the issue exists if you render with V-Ray DR directly without using BB?
Would it be possible also to render that scene with the latest V-Ray stable build? Let me know if you haven't got access to the nightlies.