Mantaflow: Slight jitter of the Domain object. Gas. #74171

New Issue

Yuriy · 2020-02-24T15:47:27+01:00

Yuriy commented

2020-02-24 15:47:27 +01:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.19

Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-02-12 16:20, hash: 77d23b0bd7

Short description of error
Most likely, jitter occurs when the adaptive Domain begins to trim the excess voxels. When extra voxels are removed, the noise information becomes incorrect and the noise shows artifacts.
simple_test_cube.blend
020001-2397.mp4
And another test. simple_test_Suzanne.blend
0001-2879.mp4

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.19 **Blender Version** Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-02-12 16:20, hash: `77d23b0bd7` **Short description of error** Most likely, jitter occurs when the adaptive Domain begins to trim the excess voxels. When extra voxels are removed, the noise information becomes incorrect and the noise shows artifacts. [simple_test_cube.blend](https://archive.blender.org/developer/F8373065/simple_test_cube.blend) [020001-2397.mp4](https://archive.blender.org/developer/F8373067/020001-2397.mp4) And another test. [simple_test_Suzanne.blend](https://archive.blender.org/developer/F8373074/simple_test_Suzanne.blend) [0001-2879.mp4](https://archive.blender.org/developer/F8373077/0001-2879.mp4)

Yuriy commented

2020-02-24 15:47:27 +01:00

Added subscriber: @YuraKharitonow

Yuriy commented

2020-02-26 10:13:39 +01:00

I found out that jitter only appears with Noise enabled in the Domain settings. Without noise, baked smoke does not tremble. In the video, the result is first with noise, then without noise. Noise_jerk0001-1514.mp4
I uploaded the cache. Only 180-190 frames.cache.rar

I found out that jitter only appears with Noise enabled in the Domain settings. Without noise, baked smoke does not tremble. In the video, the result is first with noise, then without noise. [Noise_jerk0001-1514.mp4](https://archive.blender.org/developer/F8371029/Noise_jerk0001-1514.mp4) I uploaded the cache. Only 180-190 frames.[cache.rar](https://archive.blender.org/developer/F8371035/cache.rar)

Richard Antalik commented

2020-02-26 12:38:33 +01:00

Added subscriber: @iss

Richard Antalik commented

2020-02-26 12:38:33 +01:00

I would suggest trying to strip this file from any unnecessary things such as camera animation.
Preferably also simplifying simulation. With file as is now it may be impossible to debug.

I would suggest trying to strip this file from any unnecessary things such as camera animation. Preferably also simplifying simulation. With file as is now it may be impossible to debug.

Yuriy commented

2020-02-26 15:27:31 +01:00

Most likely, jitter occurs when the adaptive Domain begins to trim the excess voxels. When extra voxels are removed, the noise information becomes incorrect and the noise shows artifacts.
simple_test_cube.blend
020001-2397.mp4
And another test. simple_test_Suzanne.blend
0001-2879.mp4

Most likely, jitter occurs when the adaptive Domain begins to trim the excess voxels. When extra voxels are removed, the noise information becomes incorrect and the noise shows artifacts. [simple_test_cube.blend](https://archive.blender.org/developer/F8373065/simple_test_cube.blend) [020001-2397.mp4](https://archive.blender.org/developer/F8373067/020001-2397.mp4) And another test. [simple_test_Suzanne.blend](https://archive.blender.org/developer/F8373074/simple_test_Suzanne.blend) [0001-2879.mp4](https://archive.blender.org/developer/F8373077/0001-2879.mp4)

Richard Antalik commented

2020-02-26 18:40:21 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Richard Antalik commented

2020-02-26 18:40:21 +01:00

@Yuriy Thanks for simplified case. Can you also point out frames to look for? I am looking at cube render and don't see anything extraordinary

It would be better for developer to render only say 10 frames not whole animation

@Yuriy Thanks for simplified case. Can you also point out frames to look for? I am looking at cube render and don't see anything extraordinary It would be better for developer to render only say 10 frames not whole animation

Yuriy commented

2020-02-27 10:19:39 +01:00

Frames 88-89.
030001-0950.mp4

Frames 88-89. [030001-0950.mp4](https://archive.blender.org/developer/F8374975/030001-0950.mp4)

Richard Antalik commented

2020-03-11 20:02:59 +01:00

Changed status from 'Needs User Info' to: 'Confirmed'

Sebastián Barschkis commented

2020-04-09 15:53:06 +02:00

Added subscriber: @sebbas

Sebastián Barschkis commented

2020-04-09 15:53:06 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Sebastián Barschkis closed this issue

2020-04-09 15:53:06 +02:00

Sebastián Barschkis self-assigned this 2020-04-09 15:53:06 +02:00

Sebastián Barschkis commented

2020-04-09 15:53:06 +02:00

I think this issue is related to #72253. A detailed explanation can be found over there.

In short: The solution is to use a smaller Empty Space value. And since the adaptive domain is being used, the Threshold (Adaptive Domain panel) also needs to be smaller.
Otherwise voxels with smoke will be considered "empty" too soon.

I think this issue is related to #72253. A detailed explanation can be found over there. In short: The solution is to use a smaller `Empty Space` value. And since the adaptive domain is being used, the `Threshold` (Adaptive Domain panel) also needs to be smaller. Otherwise voxels with smoke will be considered "empty" too soon.

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Mantaflow: Slight jitter of the Domain object. Gas. #74171