Random Pulse/Zoom/FOV Render Error

[Bex]

I keep getting a strange render problem. Footage once it comes back from renderfarm looks like it has random frames that seem to do tiny zooms, almost like the FOV is being calculated slightly differently. This is happening across 4 different scenes I'm currently working on.

It's not a problem that seems to be localised to any particular render node or frame in the animation. Happens completely at random in the last two thirds of the scenes, about 50 frames out of 300 will enlarge slightly. Currently having to comb through each sequence, identify frames, re-submit them to render, then check those ones all came out ok, normally another 5-10 out of the 50 re-submitted will need to be re-submitted again.

Computer that I'm working on and renderfarm are all updated to Max 2016 and Vray 3.20.03.
Camera and target are smooth, no hidden key frames.
Irradiance Map and Light Cache have both been precalulated.
Dumped all render settings and re-created them.

Has anyone got any ideas on what is causing this?


Bex

[Alex_M]

Is it possible that the different slaves are loading the rendered scene at different units? I've noticed that if you change scene units, cameras in the scene zoom in or out a bit.

[Bex]

Why would slaves be rendering a saved Max scene at different units? I've always changed my units to display 'cm' and use 'mm', never had this happen before. Should I try setting them all back to Max default units?

[Alex_M]

No idea to be honest. Just sharing a similar experience I've had with cameras changing FOV depending on scene units. However, in my case I wasn't rendering with DR so I'm not sure if this would happen with DR turned on. Maybe you could try and see what happens.

[tsvetan.geshev]

Can send us the scene to check if we can reproduce the issue here?

[svetlozar.draganov]

We got the scene but we have a few questions/requests:

1.Would it be possible to send the render output to get some idea how exactly the issue looks like?
2.Since the scene is quite complex with lot of frames which requires some time to be calculated would it be possible to give us some directions which frames/regions/cameras we should render in order to reproduce the issue in the quickest possible way?
3.There are some missing plugins used in the scene, are they important to reproduce the issue?


Thank you very much in advance.

[Bex]

Hi Svetlocar,

I have responded to you via email.
1. I have sent a render output sequence
2. The issue becomes pronounced around frame 281
3. maxtoae won't affect the scene and is not important for the issue.

Thank you,

Bex