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Weird "glitches" while rendering a sequence

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Paolo Di NoiaWeird "glitches" while rendering a sequence
by on Jun 7, 2014 at 8:13:50 am

I'm rendering a 150 frames sequence. If I render a single frame in any part of the sequence it does it fine. However if I try to render the full video, either as a PNG sequence or a Quicktime Movie some weird "glitches" start appearing on the objects. The first frame is fine, and then these glitches start appearing more and more after the first one. Here's an example:

Frame 1:
http://i.gyazo.com/30a8c9079b14512f2ce792b252d0a979.png

Frame 10:
http://i.gyazo.com/08061218d7251a359ac75a6725314075.png

Frame 21:
http://i.gyazo.com/8ad653a290384ac39de07d4e086c1cca.png

I'm running Cinema 4D R15 Broadcast on a Windows 8.1 computer with an i5 4670k running at 4.3 GHz.


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Adam TrachtenbergRe: Weird "glitches" while rendering a sequence
by on Jun 7, 2014 at 2:56:44 pm

Are you using global illumination?


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Paolo Di NoiaRe: Weird "glitches" while rendering a sequence
by on Jun 7, 2014 at 3:30:24 pm
Last Edited By Paolo Di Noia on Jun 7, 2014 at 5:20:25 pm

Yes

EDIT: Global Illumination is the problem, disabling it removes the issue. However I want it on, do you have any suggestion on how to fix this issue?


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Darby EdelenRe: Weird "glitches" while rendering a sequence
by on Jun 7, 2014 at 8:49:32 pm

Well, QMC won't have this issue but it will require more render time. Check your cache file settings and try switching the state of Full Animation Mode.

Darby Edelen


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Paolo Di NoiaRe: Weird "glitches" while rendering a sequence
by on Jun 8, 2014 at 9:30:53 am

Thank you, Full Animation did the trick! I have another problem with this scene tho, and I was wondering if you could help me with it as well? The lights reflections on the dominos seem to flicker and I don't know why. Here's the video:







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Darby EdelenRe: Weird "glitches" while rendering a sequence
by on Jun 8, 2014 at 5:20:01 pm

That's classic irradiance cache behavior. You might be able to improve the results by increasing the record density or sampling. QMC won't do that but it will add some noise into the render.

What are your global illumination settings?

How are you lighting the scene? Are you using lights or polygon lights? If the latter make sure that GI Area Light is enabled in the lighting/luminous material.

Darby Edelen


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Paolo Di NoiaRe: Weird "glitches" while rendering a sequence
by on Jun 9, 2014 at 8:22:35 am

Thank you very much for your help. Unfortunately I'm still experiencing the same issue. I set both Record Density and Sampling from low to high. My global illumination settings are the following:

http://gyazo.com/e6cc33adbf560061e12907128d8a98df
http://gyazo.com/e2b438ceba9f920519dcd969aed16b30
http://gyazo.com/0d55a92c2b49eed78acf6b31b6281d90
http://gyazo.com/e8b1b824e30e9c31c4779e760f519da4
http://gyazo.com/f28779627354ba31b806374a9de80e1d

I'm lighting the scene with both lights and polygon lights. The "GI Area Light" switch in the material settings for the polygon lights is enabled. Do you have any other suggestion?


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Darby EdelenRe: Weird "glitches" while rendering a sequence
by on Jun 9, 2014 at 1:42:12 pm

The path count in your light map settings is pretty low. Light mapping can cause the same sort of artifacts with low settings. I'd recommend trying a path count setting of 10,000.

You might be able to lower the GI samples back to medium to offset the increase in render time.

Darby Edelen


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Paolo Di NoiaRe: Weird "glitches" while rendering a sequence
by on Jun 10, 2014 at 7:21:29 am

I did as you said and the flickering decreased drastically. Thanks for the support.


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