Fluid inflow behaves unexpectedly when keyframed #59384

New Issue

Andy H · 2018-12-14T19:57:36+01:00

Andy H commented

2018-12-14 19:57:36 +01:00

System Information
Operating system: Windows 10 x64
Graphics card: nVidia GTX 1060 6gb

Blender Version
Broken: 2.79b Date 2018-03-22 14:10

Short description of error
Adding a keyframe for the fluid inflow 'Enabled' property, when the property is unchecked, will cause the fluid simulation to behave differently from the non-keyframed version, even if the keyframe is at the end of the simulation. (Specifically the fluid velocity setting seems to be ignored.)

Exact steps for others to reproduce the error

Open default startup file, delete default cube.
Add a new cube to origin, set radius to 5. Set maximum draw type to wireframe.
Make the cube a fluid domain with default settings. Leave start and end time at 0 and 4. Set viewport display to final.
Add an icosphere to origin, leave size at 1
Make the icosphere a fluid inflow with default settings. Leave volume initialization as 'Volume' and inflow velocity at 0.
Leave start and end frames at 1 and 250. Bake.
The fluid clings to the sphere and intermittently drips down as separate droplets into a small puddle.
Set the timeline to keyframe 1. Select the icosphere and insert a keyframe for the checked 'Enabled' property.
Select the icosphere and uncheck the 'Enabled' property. Insert a keyframe for the unchecked 'Enabled' property at keyframe 250.
Select the domain and bake again
The fluid now streams out of the icosphere in a continuous column, filling up the domain box partway.
Move the timeline to frame 249. Select the icosphere. Check the 'Enabled' property and keyframe it at 249.
Bake. The fluid still streams out of the icosphere continuously and fills the domain.

**System Information** Operating system: Windows 10 x64 Graphics card: nVidia GTX 1060 6gb **Blender Version** Broken: 2.79b Date 2018-03-22 14:10 **Short description of error** Adding a keyframe for the fluid inflow 'Enabled' property, when the property is unchecked, will cause the fluid simulation to behave differently from the non-keyframed version, even if the keyframe is at the end of the simulation. (Specifically the fluid velocity setting seems to be ignored.) **Exact steps for others to reproduce the error** 1) Open default startup file, delete default cube. 2) Add a new cube to origin, set radius to 5. Set maximum draw type to wireframe. 3) Make the cube a fluid domain with default settings. Leave start and end time at 0 and 4. Set viewport display to final. 4) Add an icosphere to origin, leave size at 1 5) Make the icosphere a fluid inflow with default settings. Leave volume initialization as 'Volume' and inflow velocity at 0. 6) Leave start and end frames at 1 and 250. Bake. 7) The fluid clings to the sphere and intermittently drips down as separate droplets into a small puddle. 8) Set the timeline to keyframe 1. Select the icosphere and insert a keyframe for the checked 'Enabled' property. 9) Select the icosphere and uncheck the 'Enabled' property. Insert a keyframe for the unchecked 'Enabled' property at keyframe 250. 10) Select the domain and bake again 11) The fluid now streams out of the icosphere in a continuous column, filling up the domain box partway. 12) Move the timeline to frame 249. Select the icosphere. Check the 'Enabled' property and keyframe it at 249. 13) Bake. The fluid still streams out of the icosphere continuously and fills the domain.

Andy H commented

2018-12-14 19:57:36 +01:00

Added subscriber: @complexly

Sebastian Parborg commented

2018-12-19 14:35:59 +01:00

Added subscribers: @brecht, @ZedDB

Sebastian Parborg commented

2018-12-19 14:36:00 +01:00

@brecht, what to do with fluid issues? I'm guessing that nothing will be done until mantaflow has been merged.

Brecht Van Lommel commented

2018-12-21 18:08:32 +01:00

The current fluid system has no maintainer, so there isn't really anyone to assign it to. So chances of this being fixed are indeed quite low at this point.

Sebastian Parborg commented

2020-01-17 16:45:29 +01:00

Changed status from 'Confirmed' to: 'Archived'

Sebastian Parborg closed this issue

2020-01-17 16:45:29 +01:00

Sebastian Parborg self-assigned this 2020-01-17 16:45:29 +01:00

Sebastian Parborg commented

2020-01-17 16:45:29 +01:00

This issue is for the old fluid system that has now been removed from blender, closing.

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Fluid inflow behaves unexpectedly when keyframed #59384