Noise OpenVDB baked with Mantaflow is not visible by Cycles and EEVEE #100742

Closed
opened 2022-09-01 00:19:44 +02:00 by Jakub Jaszewski · 10 comments

System Information
system-info.txt

Blender Version
Broken: version: 3.4.0 Alpha, branch: master, commit date: 2022-08-24 00:20, hash: be81690b73

Short description of error
Mantaflow during baking smoke simulation produces two kinds of vdb files - data and noise. Second is only baked if noiseoption is set before baking. Those cache files baked for each frame can be then imported as individual objects into Blender with import vdb volume for further work.

When the simulation is baked with Blender be81690b73 and those vdb files are imported into a scene then Cycles and EEVEE does not render noise vdb files. They are visible in the Outliner and are rendered properly in Workbench.

I also checked and those files are not visible in Blender 3.3 but I didn't tried to bake the simulation in other versions than master.

2022-08-31_23-52.png

2022-08-31_23-52_1.png

Exact steps for others to reproduce the error

  1. Open attached file.
  2. Change viewport shading to Rendered
  3. Observe fluid_noise_0005 object.

Alternatively for triaging purposes:

  1. Open attached file.
  2. With Smoke Domain object selected go to Properties -> Physics -> Fluid
  3. Under Cache set temporary path for cache files (could be whatever)
  4. Still in Cache hit Bake All and wait for bake to finish.
  5. Locate cache files.
  6. Shift + A -> Volume -> Import OpenVDB and select one vdb file from data cache folder and one from noise.
  7. Change viewport shading to Rendered.
  8. Observe noise object.

VDB_NOISE.blend

**System Information** [system-info.txt](https://archive.blender.org/developer/F13442668/system-info.txt) **Blender Version** Broken: version: 3.4.0 Alpha, branch: master, commit date: 2022-08-24 00:20, hash: be81690b73ad **Short description of error** Mantaflow during baking smoke simulation produces two kinds of vdb files - `data` and `noise`. Second is only baked if `noise`option is set before baking. Those cache files baked for each frame can be then imported as individual objects into Blender with import vdb volume for further work. When the simulation is baked with Blender be81690b73ad and those vdb files are imported into a scene then Cycles and EEVEE does not render `noise` vdb files. They are visible in the Outliner and are rendered properly in Workbench. I also checked and those files are not visible in Blender 3.3 but I didn't tried to bake the simulation in other versions than master. ![2022-08-31_23-52.png](https://archive.blender.org/developer/F13442712/2022-08-31_23-52.png) ![2022-08-31_23-52_1.png](https://archive.blender.org/developer/F13442713/2022-08-31_23-52_1.png) **Exact steps for others to reproduce the error** 1. Open attached file. 2. Change viewport shading to `Rendered` 3. Observe `fluid_noise_0005` object. Alternatively for triaging purposes: 1. Open attached file. 2. With `Smoke Domain` object selected go to Properties -> Physics -> Fluid 3. Under `Cache` set temporary path for cache files (could be whatever) 4. Still in `Cache` hit `Bake All` and wait for bake to finish. 5. Locate cache files. 6. `Shift + A` -> Volume -> Import OpenVDB and select one vdb file from `data` cache folder and one from `noise`. 7. Change viewport shading to `Rendered`. 8. Observe `noise` object. [VDB_NOISE.blend](https://archive.blender.org/developer/F13442735/VDB_NOISE.blend)

Added subscriber: @silex

Added subscriber: @silex
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Changed status from 'Needs Triage' to: 'Confirmed'

Changed status from 'Needs Triage' to: 'Confirmed'
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Added subscriber: @PratikPB2123

Added subscriber: @PratikPB2123

Added subscriber: @brecht

Added subscriber: @brecht

Principled Volume will by default use the density grid as density. In these files there is density_noise instead, which can be manually set in the shader node.

Principled Volume will by default use the `density` grid as density. In these files there is `density_noise` instead, which can be manually set in the shader node.

Ah, indeed.
If that is by design then I guess this report can be closed.
Sorry for the noise (pun intended).

Ah, indeed. If that is by design then I guess this report can be closed. Sorry for the noise (pun intended).
Member

Added subscriber: @lichtwerk

Added subscriber: @lichtwerk
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Changed status from 'Confirmed' to: 'Archived'

Changed status from 'Confirmed' to: 'Archived'
Member

If using density_noise as the Density Attribute in the shader works correctly, then I would assume this can indeed be closed (@brecht: correct me if I am wrong).

If using `density_noise` as the `Density Attribute` in the shader works correctly, then I would assume this can indeed be closed (@brecht: correct me if I am wrong).

I think so. If anything should be fixed it's in mantaflow, and that's not rbeing maintained.

I think so. If anything should be fixed it's in mantaflow, and that's not rbeing maintained.
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Reference: blender/blender#100742
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