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I am having an issue in my renders where random frames are "flickering". I am having the exact same issue this person was having and no one seemed to be able to answer his question: What causes rendered frame "flickering"?

Here is my animation with the issue: https://www.youtube.com/watch?v=UcIcOf4g3-g

I have put hours into finding a solution and I can't seem to find one. Here are the solutions that I tried:

I have tried rendering with motion blur OFF and it fixes SOME frames. Still not a definitive solution though.

I have messed with camera settings.

I have rendered the shadows separately and the meshes separately.

Rendered with GPU and CPU.

None of these seem to make a difference.

I don't believe this is z-fighting because no faces intersect with each other ever.

I am on a very tight deadline and I can't find a solution. Please let me know if anyone knows a solution.

Dropbox link to the Blender file: https://www.dropbox.com/s/9q2jf745go6u1l9/flickering_problem.blend?dl=0

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  • $\begingroup$ Could you show us some actual info about your scene, like render settings, compositor node setup, render layers, sampling and performance settings, material setups, lighting, ambient occlusion, etc.? Looks like some sort of sampling error between frames $\endgroup$
    – Duarte Farrajota Ramos ♦
    Commented Oct 29, 2017 at 22:06
  • $\begingroup$ Are growing objects being scaled to zero? This may cause sampling errors $\endgroup$
    – Duarte Farrajota Ramos ♦
    Commented Oct 29, 2017 at 22:07
  • $\begingroup$ @DuarteFarrajotaRamos Thank you for answering so quickly! I have updated the question with the blender file on dropbox. $\endgroup$
    – matty
    Commented Oct 29, 2017 at 22:17

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Well you have a scene lit by three sun lamps which is not very conventional, but that should not cause problems by itself.

The real source of the problem is that your lighting seems inconsequential and the lamp placement random and not well thought out.

You lamp objects are intermittently inside and outside of animated objects. That will obviously lead to seemingly random lighting variations across frames.

Lamp placement

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  • $\begingroup$ Thank you for taking the time to look at the project. Unfortunately the problem still persists when I move the sun lamps around and away from the meshes. I am going to try your suggestions and move the lamps around and try different lamps to see if that gets rid of the problem. $\endgroup$
    – matty
    Commented Oct 29, 2017 at 23:21
  • $\begingroup$ So I deleted 2 of the sun lamps and rendered the scene and there is no flickering! Now I am going to try different lamps and see if it I get flickering but this might be the answer! $\endgroup$
    – matty
    Commented Oct 30, 2017 at 0:21

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