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Maniphest T78901

Tiles missing in render in Cycles
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Description

System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: Quadro 2000/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 377.83

Blender Version
Broken: version: 2.83.2, branch: master, commit date: 2020-07-09 05:50, hash: rB239fbf7d936f
Worked: not found

Short description of error
during rendering short (about 320frames) animation in Cycles on CPU I've found twelve frames that were rendered badly. There are tiles missing in them- just blank space instead of render in these tiles.

Exact steps for others to reproduce the error

T78901.blend1 MBDownload

  1. Open file
  2. Render

You may need to render few times or render animation. Majority of images should produce bug
Issue can not be reproduced when you disable subdiv modifier in Cube.012 object

Event Timeline

adrian (adi0) created this task.Jul 14 2020, 12:39 AM
Richard Antalik (ISS) changed the task status from Needs Triage to Needs Information from User.Jul 15 2020, 1:04 AM
Richard Antalik (ISS) added a subscriber: Richard Antalik (ISS).

Can you upload simple example file?

adrian (adi0) added a comment.Jul 15 2020, 3:03 AM

ok, here is upload

spaceship6.blend6 MBDownload

Richard Antalik (ISS) added a comment.Jul 15 2020, 11:07 PM

Thanks for example file, I guess to reproduce we need to use hdr texture, is that correct? Also file is very slow to render. Can you simplify it as much as possible to reproduce problem as quickly as possible?

adrian (adi0) added a comment.EditedJul 17 2020, 2:00 AM

right, I forgot about hdr texture for environment. I used this one attached here. I'm not sure - how to simplify this .blend file ?

Richard Antalik (ISS) added a comment.Jul 17 2020, 2:06 AM
In T78901#980562, @adrian (adi0) wrote:

how to simplify this .blend file ?

Delete any objects that doesn't cause bug. Usually you need only handful of elements to reproduce the issue

Campbell Barton (campbellbarton) added a subscriber: Campbell Barton (campbellbarton).Jul 27 2020, 1:14 PM

@adrian (adi0) could you provide a simplified blend? Otherwise this report will be closed.

adrian (adi0) added a comment.EditedJul 29 2020, 9:29 PM

I don't know how to make it simplier and which (if) objects casues the problem. Please verify problem with rendering on this file. As I said - problem happens on random frames and random time and different tiles are missing at the same frame rendered few times - it means I can render the same frame with different (good or bad) result without changing anything so I really don't know what causes the problem and what not delete

adrian (adi0) renamed this task from tales missing in render in Cycles to tiles missing in render in Cycles .Jul 29 2020, 11:02 PM
adrian (adi0) updated the task description. (Show Details)
Richard Antalik (ISS) added a comment.Jul 31 2020, 7:24 PM
In T78901#987397, @adrian (adi0) wrote:

I don't know how to make it simplier and which (if) objects casues the problem. Please verify problem with rendering on this file. As I said - problem happens on random frames and random time and different tiles are missing at the same frame rendered few times - it means I can render the same frame with different (good or bad) result without changing anything so I really don't know what causes the problem and what not delete

We don't know either. I have been able to confirm issue now at least, but still don't know exactly what cause this. So far I got this file

T78901.blend2 MBDownload

It would definitely help us to strip it down further. deleting all objects seems to be too much.

I have swapped environment texture to check if that is problem and I got this result:

So tiles are not black, but rather coordinates are different somehow.

Richard Antalik (ISS) added a comment.Aug 6 2020, 8:32 AM

Had another go at this issue, found problematic object. If I disable subdiv modifier, the issue disappears, so perhaps there is some data corruption.

T78901.blend1 MBDownload

Reproducibility is now near 100%

Richard Antalik (ISS) renamed this task from tiles missing in render in Cycles to Tiles missing in render in Cycles .Aug 7 2020, 3:27 AM
Richard Antalik (ISS) changed the task status from Needs Information from User to Confirmed.
Richard Antalik (ISS) updated the task description. (Show Details)
Richard Antalik (ISS) added projects: Render & Cycles, Modeling.
Raimund Klink (Raimund58) added a subscriber: Raimund Klink (Raimund58).Sep 7 2020, 11:03 AM

@Richard Antalik (ISS) Hi, can you still reproduce it? Because I just tried it in 2.90 (release) and could not reproduce it...

Richard Antalik (ISS) added a comment.Sep 8 2020, 1:49 AM
In T78901#1010727, @Raimund Klink (Raimund58) wrote:

@Richard Antalik (ISS) Hi, can you still reproduce it? Because I just tried it in 2.90 (release) and could not reproduce it...

Will have a look. Best way to check if issue is solved is to check with version mentioned in report to see if the issue is still there

Richard Antalik (ISS) closed this task as Resolved.Sep 8 2020, 2:10 AM
Richard Antalik (ISS) claimed this task.

Indeed this issue seems to be resolved in 2.90 release