Force fields don't work on a fire simulation with Flame Smoke 0 #86512

New Issue

John Bread · 2021-03-12T04:09:59+01:00

John Bread commented

2021-03-12 04:09:59 +01:00

System Information
Operating system: Windows 7 (64 bits)
Graphics card: Radeon R7 200

Blender Version
Broken: 2.83, 2.92.0
Worked: -

Short description of error
Setting the Flame Smoke to 0 makes the fire simulation to ignore all forces except gravity.

Exact steps for others to reproduce the error

create a Quick Smoke simulation
set the Flow object to Fire, behaviour to Inflow
set Domain object Flame Smoke to 0 in the domain object of a fire simulation

I've also added a particle system to visualize the force, while the fire remains unaffected:

Here's a test file:fire-test.blend

**System Information** Operating system: Windows 7 (64 bits) Graphics card: Radeon R7 200 **Blender Version** Broken: 2.83, 2.92.0 Worked: - **Short description of error** Setting the Flame Smoke to 0 makes the fire simulation to ignore all forces except gravity. **Exact steps for others to reproduce the error** * create a Quick Smoke simulation * set the Flow object to Fire, behaviour to Inflow * set Domain object Flame Smoke to 0 in the domain object of a fire simulation I've also added a particle system to visualize the force, while the fire remains unaffected: ![forces-stopped-working.jpeg](https://archive.blender.org/developer/F9886000/forces-stopped-working.jpeg) Here's a test file:[fire-test.blend](https://archive.blender.org/developer/F9885998/fire-test.blend)

John Bread commented

2021-03-12 04:09:59 +01:00

Added subscriber: @Otraz

Philipp Oeser commented

2021-03-12 13:40:24 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-03-12 13:40:24 +01:00

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

Philipp Oeser commented

2021-03-12 13:40:24 +01:00

Can confirm.

**System Information**
Operating system: Linux-5.10.19-200.fc33.x86_64-x86_64-with-glibc2.32 64 Bits
Graphics card: GeForce GTX 970M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 455.45.01
version: 2.93.0 Alpha, branch: master (modified), commit date: 2021-03-12 08:22, hash: `rBa5c44265a336`

Can confirm. ``` **System Information** Operating system: Linux-5.10.19-200.fc33.x86_64-x86_64-with-glibc2.32 64 Bits Graphics card: GeForce GTX 970M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 455.45.01 version: 2.93.0 Alpha, branch: master (modified), commit date: 2021-03-12 08:22, hash: `rBa5c44265a336` ```

Ritik Mittal commented

2021-03-28 01:55:44 +01:00

Added subscriber: @ritikmittal

Ritik Mittal commented

2021-03-28 01:55:44 +01:00

Hey, The issue is that, in mantaflow fire without smoke, is considered just massless flames. In the file source/blender/blenkernel/intern/fluid.c in function update_effectors_task_cb() there is a if statement which will check for density of object before applying any force or effector. But as fire without smoke has a density set to 0, the effector function never get called. So I don't know if this is exactly a bug or not. As in practical purpose also, you can't really apply any force to a massless objects.

Iago Mota commented

2022-03-16 13:46:36 +01:00

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

Dalai Felinto commented

2022-05-09 10:59:32 +02:00

Mantaflow (fluid simulator) has no active developer at the moment. Moving those reports as known issues so at least other users can find their issues already reported.

Philipp Oeser removed the

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Force fields don't work on a fire simulation with Flame Smoke 0 #86512