Mantaflow Noise Smear (OpenVDB cache) #92101

New Issue

Anže · 2021-10-11T04:25:29+02:00

Anže commented

2021-10-11 04:25:29 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.12

Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-10-09 19:40, hash: 79425ed326

Short description of error
When you add the noise effect to any gas simulation (that uses the OpenVDB cache type) it creates a smearing effect. It only adds to the simulation and it never deletes itself.

Video explanation base simulation | with noise enabled | overlayed

Noise_Smear.mp4

Noise_Smear_2.mp4

Exact steps for others to reproduce the error

Create any kind of Mantaflow gas simulation (if the emitter moves it is the most noticeable)
Leave the cache type to OpenVDB (With UniCache it works properly)
Enable Noise
Bake the simulation

Test File:
Noise_smear_bug.blend

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.12 **Blender Version** Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-10-09 19:40, hash: `79425ed326` **Short description of error** When you add the noise effect to any gas simulation (that uses the OpenVDB cache type) it creates a smearing effect. It only adds to the simulation and it never deletes itself. **Video explanation** base simulation | with noise enabled | overlayed [Noise_Smear.mp4](https://archive.blender.org/developer/F10955048/Noise_Smear.mp4) [Noise_Smear_2.mp4](https://archive.blender.org/developer/F10955057/Noise_Smear_2.mp4) **Exact steps for others to reproduce the error** - Create any kind of Mantaflow gas simulation (if the emitter moves it is the most noticeable) - Leave the cache type to OpenVDB (With UniCache it works properly) - Enable [Noise ](https://docs.blender.org/manual/en/dev/physics/fluid/type/domain/gas/noise.html#bpy-types-fluiddomainsettings-use-noise) - Bake the simulation Test File: [Noise_smear_bug.blend](https://archive.blender.org/developer/F10959806/Noise_smear_bug.blend)

Anže commented

2021-10-11 04:25:29 +02:00

Added subscriber: @koko_ze

Pratik Borhade commented

2021-10-11 08:04:43 +02:00

Added subscriber: @PratikPB2123

Anže changed title from ~~Mantaflow Noise Smear~~ to Mantaflow Noise Smear (OpenVDB cache)

2021-10-19 00:06:49 +02:00

Sebastián Barschkis was assigned by Anže

2021-10-19 00:06:49 +02:00

Germano Cavalcante commented

2021-10-21 19:31:10 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2021-10-21 19:31:10 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Germano Cavalcante commented

2021-10-21 19:31:10 +02:00

Thanks for the report and the simplified file.
I can confirm the problem.

Thanks for the report and the simplified file. I can confirm the problem.

Philipp Oeser commented

2021-10-22 08:27:52 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-10-22 08:27:52 +02:00

Likely closely related to (or a duplicate of)

#71391 (Line artifacts in Mantaflow smoke sim when using "Noise") or
#81017 (Mantaflow: Noise doesn't follow smoke)

Likely closely related to (or a duplicate of) - #71391 (Line artifacts in Mantaflow smoke sim when using "Noise") or - #81017 (Mantaflow: Noise doesn't follow smoke)

Iago Mota commented

2022-01-23 19:14:38 +01:00

Added subscriber: @Iago-Diogo-de-Vasconcelos-Mota

Dalai Felinto commented

2022-05-09 11:01:07 +02:00

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.

Philipp Oeser removed the

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Mantaflow Noise Smear (OpenVDB cache) #92101