Mantaflow - glitchers/flickers when using adaptive domain + noise #77601

New Issue

Carlos Troncoso · 2020-06-08T06:55:18+02:00

Carlos Troncoso commented

2020-06-08 06:55:18 +02:00

System Information
Operating system: Ubuntu 20.04 + Mac OSx
Graphics card: GTX 1050i

Blender Version
Broken: 2.83.0
Worked: 2.82a

Short description of error
Fire flickers and mixes with smoke.

Correct simulation on 2.82a with adaptive domain and noise
2.82a_test0001-0050.mkv

Flickering and smoke showing up as fire. on 2.83.0
2.83.00001-0050.mkv

Opening the 2.82a file on 2.83 without rebaking, shows ok.
Rebaking without changing any parameters also works on 2.83.0

Exact steps for others to reproduce the error
Delete everything.
Create a circle, edit and fill.
Quick Effects -> Quick Smoke (Fire+Smoke)
Set resolution divisions to 64
Enable Adaptive domain
Enable Noise
Bake simulation + noise

**System Information** Operating system: Ubuntu 20.04 + Mac OSx Graphics card: GTX 1050i **Blender Version** Broken: 2.83.0 Worked: 2.82a **Short description of error** Fire flickers and mixes with smoke. Correct simulation on 2.82a with adaptive domain and noise [2.82a_test0001-0050.mkv](https://archive.blender.org/developer/F8597670/2.82a_test0001-0050.mkv) Flickering and smoke showing up as fire. on 2.83.0 [2.83.00001-0050.mkv](https://archive.blender.org/developer/F8597669/2.83.00001-0050.mkv) Opening the 2.82a file on 2.83 without rebaking, shows ok. Rebaking without changing any parameters also works on 2.83.0 **Exact steps for others to reproduce the error** Delete everything. Create a circle, edit and fill. Quick Effects -> Quick Smoke (Fire+Smoke) Set resolution divisions to 64 Enable Adaptive domain Enable Noise Bake simulation + noise

Carlos Troncoso commented

2020-06-08 06:55:18 +02:00

Added subscriber: @schmicky

Ankit Meel commented

2020-06-08 12:17:00 +02:00

Added subscriber: @ankitm

Ankit Meel commented

2020-06-08 12:17:00 +02:00

https://developer.blender.org/T76238#932632

Hello, I found the solution. The problem with flickering was causing by max number of bounces setting. I changed transmission, volumetric and the other ones to 16 from 4 and flickering disappeared !

https://developer.blender.org/T76238#932632 >Hello, I found the solution. The problem with flickering was causing by max number of bounces setting. I changed transmission, volumetric and the other ones to 16 from 4 and flickering disappeared !

Carlos Troncoso commented

2020-06-08 18:36:24 +02:00

In #77601#948398, @ankitm wrote:
https://developer.blender.org/T76238#932632

Hello, I found the solution. The problem with flickering was causing by max number of bounces setting. I changed transmission, volumetric and the other ones to 16 from 4 and flickering disappeared !

Thanks but I've seen it.
Wouldn't consider it a solution, but a low quality workaround.
That problem was fixed without restricting a completely valid transmission value. I bet it's a regression that brought back a known bug.
Furthermore, the same simulation, created on 2.82a, opened and rebaked on 2.83.0 worked fine without reducing transmission, so there is a fix without need of this workaround.

> In #77601#948398, @ankitm wrote: > https://developer.blender.org/T76238#932632 >>Hello, I found the solution. The problem with flickering was causing by max number of bounces setting. I changed transmission, volumetric and the other ones to 16 from 4 and flickering disappeared ! Thanks but I've seen it. Wouldn't consider it a solution, but a low quality workaround. That problem was fixed without restricting a completely valid transmission value. I bet it's a regression that brought back a known bug. Furthermore, the same simulation, created on 2.82a, opened and rebaked on 2.83.0 worked fine without reducing transmission, so there is a fix without need of this workaround.

Carlos Troncoso commented

2020-06-09 14:59:48 +02:00

https://developer.blender.org/T77678 Related

Wender Silva commented

2020-06-10 06:41:39 +02:00

Added subscriber: @wenderversaofull

Adam Burke commented

2020-06-10 23:19:12 +02:00

Added subscriber: @Adam-Burke

Adam Burke commented

2020-06-10 23:42:02 +02:00

mantaflow problem 2.83 - 2.83.mp4

mantaflow problem 2.83 - 2.82.mp4

same issue here. Happens with all generation of fire with mantaflow in 2.83 - same file baked in 2.82 & 2.83 attached...

[mantaflow problem 2.83 - 2.83.mp4](https://archive.blender.org/developer/F8606777/mantaflow_problem_2.83_-_2.83.mp4) [mantaflow problem 2.83 - 2.82.mp4](https://archive.blender.org/developer/F8606773/mantaflow_problem_2.83_-_2.82.mp4) same issue here. Happens with all generation of fire with mantaflow in 2.83 - same file baked in 2.82 & 2.83 attached...

Jacques Lucke commented

2020-06-17 12:40:23 +02:00

Closed as duplicate of #77678

Jacques Lucke closed this issue

2020-06-17 12:40:23 +02:00

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Mantaflow - glitchers/flickers when using adaptive domain + noise #77601