OpenVDB cache Mantaflow Gas has Hollow Emission #91174

New Issue

Anže · 2021-09-04T00:20:21+02:00

Anže commented

2021-09-04 00:20:21 +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 471.68

Blender Version
Broken: version: 3.0.0 Alpha, branch: cycles-x, commit date: 2021-09-02 10:34, hash: b72c1e9324
Also Broken with the Blender 2.93 version.

Short description of error
Solid emitters aren't solid. They have an empty interior even if you put the Volume Emission setting to 1.
If the cache type is set to UniCache it fixes this problem.

Emitter settings:

Viewport 2D slice:
hollow_emission_Viewport-slice.mp4

Render with default volume shader settings:
hollow_emission_Render.mp4

Exact steps for others to reproduce the error

Create a gas domain from a cube
Increase the "Resolution Divisions" to 80
Change the cache type to modular and resumable
Create an emitter from a cube
In the Flow source settings set the "Surface Emission" to 0.0 and "Volume Emission" to 1.0
Bake the simulation

Optionally inspect it using the viewport slice option.

Based on an attached .blend file
hollow_emission.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 471.68 **Blender Version** Broken: version: 3.0.0 Alpha, branch: cycles-x, commit date: 2021-09-02 10:34, hash: `b72c1e9324` Also Broken with the Blender 2.93 version. **Short description of error** Solid emitters aren't solid. They have an empty interior even if you put the [Volume Emission ](https://docs.blender.org/manual/en/dev/physics/fluid/type/flow.html#bpy-types-fluidflowsettings-volume-density) setting to 1. **If the cache type is set to UniCache it fixes this problem.** Emitter settings: ![2021-09-04 00_13_08-Window.png](https://archive.blender.org/developer/F10375022/2021-09-04_00_13_08-Window.png) Viewport 2D slice: [hollow_emission_Viewport-slice.mp4](https://archive.blender.org/developer/F10375025/hollow_emission_Viewport-slice.mp4) Render with default volume shader settings: [hollow_emission_Render.mp4](https://archive.blender.org/developer/F10375027/hollow_emission_Render.mp4) **Exact steps for others to reproduce the error** - Create a gas domain from a cube - Increase the "Resolution Divisions" to 80 - Change the cache type to modular and resumable - Create an emitter from a cube - In the Flow source settings set the "Surface Emission" to 0.0 and "Volume Emission" to 1.0 - Bake the simulation # Optionally inspect it using the viewport slice option. Based on an attached .blend file [hollow_emission.blend](https://archive.blender.org/developer/F10375014/hollow_emission.blend)

Anže commented

2021-09-04 00:20:21 +02:00

Added subscriber: @koko_ze

Iago Mota commented

2022-01-28 22:42:40 +01:00

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

Germano Cavalcante commented

2022-01-31 16:12:15 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2022-01-31 16:12:15 +01:00

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

Germano Cavalcante commented

2022-01-31 16:12:15 +01:00

Although I am able to replicate the problem with the file attached in the description. I can't replicate from scratch. So there must be some step missing?
hollow_emission_from_steps.blend

Although I am able to replicate the problem with the file attached in the description. I can't replicate from scratch. So there must be some step missing? [hollow_emission_from_steps.blend](https://archive.blender.org/developer/F12837491/hollow_emission_from_steps.blend)

Germano Cavalcante commented

2022-02-07 22:26:56 +01:00

Have you figured out a way to reproduce the bug from scratch without using the attached file?

Anže commented

2022-02-09 02:56:03 +01:00

In #91174#1303479, @mano-wii wrote:
Have you figured out a way to reproduce the bug from scratch without using the attached file?

Yes, I can still reproduce it. Here is a video of it (this time with the 3.1 beta):
2022-02-09 02-47-48_1.mp4

I hope this helps :)

> In #91174#1303479, @mano-wii wrote: > Have you figured out a way to reproduce the bug from scratch without using the attached file? Yes, I can still reproduce it. Here is a video of it (this time with the 3.1 beta): [2022-02-09 02-47-48_1.mp4](https://archive.blender.org/developer/F12856532/2022-02-09_02-47-48_1.mp4) I hope this helps :)

Germano Cavalcante commented

2022-02-09 22:40:01 +01:00

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

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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OpenVDB cache Mantaflow Gas has Hollow Emission #91174

Optionally inspect it using the viewport slice option.