Fieldweights Gravity doesn't work with Mantaflow Liquid #74642

New Issue

Peter Keis · 2020-03-11T09:30:04+01:00

Peter Keis commented

2020-03-11 09:30:04 +01:00

System Information
Operating system: Windows-10-10.0.17763-SP0 64 Bits
Graphics card: Intel(R) HD Graphics 630 Intel 4.5.0 - Build 25.20.100.6472

Blender Version
Broken: version: 2.83 (sub 7), branch: master, commit date: 2020-03-10 12:11, hash: 85cdf9a1b9
Worked: Never

Short description of error
Sliding the gravity slider all the wy to zero doesn't effect the simulation.

Exact steps for others to reproduce the error
#74642.blend

Open a fresh Blender scene and delete everything. Add a sphere. With sphere selected choose "objects"->"quick effects"->"quick liquid".
In the physics properties go down to field weights and set the gravity slider to zero.
Bake the data and the mesh (if you like to).
Fluid is falling down to the "ground" allthough gravity has to have no influence to the simulation.

**System Information** Operating system: Windows-10-10.0.17763-SP0 64 Bits Graphics card: Intel(R) HD Graphics 630 Intel 4.5.0 - Build 25.20.100.6472 **Blender Version** Broken: version: 2.83 (sub 7), branch: master, commit date: 2020-03-10 12:11, hash: `85cdf9a1b9` Worked: Never **Short description of error** Sliding the gravity slider all the wy to zero doesn't effect the simulation. **Exact steps for others to reproduce the error** [#74642.blend](https://archive.blender.org/developer/F8411992/T74642.blend) Open a fresh Blender scene and delete everything. Add a sphere. With sphere selected choose "objects"->"quick effects"->"quick liquid". In the physics properties go down to field weights and set the gravity slider to zero. Bake the data and the mesh (if you like to). Fluid is falling down to the "ground" allthough gravity has to have no influence to the simulation.

Peter Keis commented

2020-03-11 09:30:04 +01:00

Added subscriber: @BlenderPete

Ankit Meel commented

2020-03-11 12:26:07 +01:00

Added subscriber: @ankitm

Ankit Meel commented

2020-03-11 12:26:07 +01:00

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

Ankit Meel commented

2020-03-11 12:26:07 +01:00

there are some reports about this.. please check if it is similar to one of :

https://developer.blender.org/T73680
https://developer.blender.org/T73474
https://developer.blender.org/T72949

It would help if you also provide a simple blend file.

there are some reports about this.. please check if it is similar to one of : https://developer.blender.org/T73680 https://developer.blender.org/T73474 https://developer.blender.org/T72949 It would help if you also provide a simple blend file.

Peter Keis commented

2020-03-11 14:01:57 +01:00

#73680 is not using scene gravity (scene properties -> no checkmark at "gravity") but using the gravity settings inside Mantaflow. Also it says that using this property the gravity is 10 times stronger...
#73474 is a bug report concerning real word size setting...
#72949 mentions the initial velocity not to be used by the Mantaflow emission object...

Maybe all bug reports refer to the same basic problem, but each report describes a different but incorrect behavior of Mantaflow.

I also provided a .blend. Please open it and bake the data (not provided).

MantaflowNoGravityBug.blend

#73680 is not using scene gravity (scene properties -> no checkmark at "gravity") but using the gravity settings inside Mantaflow. Also it says that using this property the gravity is 10 times stronger... #73474 is a bug report concerning real word size setting... #72949 mentions the initial velocity not to be used by the Mantaflow emission object... Maybe all bug reports refer to the same basic problem, but each report describes a different but incorrect behavior of Mantaflow. I also provided a .blend. Please open it and bake the data (not provided). [MantaflowNoGravityBug.blend](https://archive.blender.org/developer/F8400652/MantaflowNoGravityBug.blend)

Ankit Meel commented

2020-03-17 09:29:50 +01:00

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

Ankit Meel commented

2020-03-17 10:21:53 +01:00

The report seems correct. scene gravity is working as expected, but global property is always downwards despite changing slider values. https://docs.blender.org/manual/en/latest/physics/forces/gravity.html says

Changing this value would simulate a lower or higher force of gravity. Gravity denoted g, measurement m × s-2.

The report seems correct. scene gravity is working as expected, but global property is always downwards despite changing slider values. https://docs.blender.org/manual/en/latest/physics/forces/gravity.html says > Changing this value would simulate a lower or higher force of gravity. Gravity denoted g, measurement m × s-2.

Richard Antalik commented

2020-03-17 12:20:04 +01:00

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

blender-admin commented

2020-03-27 12:39:21 +01:00

This issue was referenced by 31bd8e6bf3

This issue was referenced by 31bd8e6bf3aeecf7968249c7b7e832fc639a52d5

Jacques Lucke commented

2020-03-27 12:41:41 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Jacques Lucke closed this issue

2020-03-27 12:41:41 +01:00

Jacques Lucke self-assigned this 2020-03-27 12:41:41 +01:00

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Fieldweights Gravity doesn't work with Mantaflow Liquid #74642