Line artifacts in Mantaflow smoke sim when using "Noise" #71391
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Reference: blender/blender#71391
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System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.08
Blender Version
Broken: version: 2.81 (sub 12), branch: fluid-mantaflow, commit date: 2019-10-19 21:25, hash:
998c8d18f2Worked: (optional)
Short description of error
When Noise is activated in a Mantaflow smoke sim, hash line artifacts show up in the early frames of the sim.
With Noise active:
With Noise switched off:
Here's the .blend file: mantaflow_2.81_problems.blend
Exact steps for others to reproduce the error
Create mantaflow smoke sim, bake smoke, bake noise, notice artifacts.
Added subscriber: @steveernst117
Added subscribers: @sebbas, @dfelinto
We don't usually take bug reports in work in progress branches, but I will leave to @sebbas to decide what to do here.
Thanks for reporting and testing the functionalities either way.
Added subscriber: @juang3d
I can confirm I can reproduce the problem even at render time.
Yes, thanks for reporting. I will look into this now.
@steveernst117 @juang3d Just tried to reproduce the issue but it seems to be fine now. Can you try it out as well?
@sebbas Yeah, I can confirm the project file looks much better with newest official mantaflow build. Looks like they got the bug worked out.
Changed status from 'Confirmed' to: 'Resolved'
Okay, great! Closing the issue!
Changed status from 'Resolved' to: 'Confirmed'
Another file showed up where the "line artifacts" are still visible. Reopening the issue!
Added subscriber: @GottfriedHofmann
I think I have an example file here that has the same issue but in an extreme form, hope it helps with hunting down the bug.
Here the simulation without noise:
And here the same frame with noise turned on:
How to reproduce: Open attached file and bake twice, once with noise disabled and once enabled:
rocket_manta_01.blend
Added subscriber: @Iago-Diogo-de-Vasconcelos-Mota
Added subscriber: @kubagrodzki
I have exactly the same problem. Looks terrible, especially with fast moving flames.
Removed subscriber: @dfelinto
Mantaflow (fluid simulator) has no active developer at the moment. Moving those bugs as known issues so at least other users can find their issues already reported.