Issues with Fluid sim INSIDE objects #87029

New Issue

Jean Marc MONS · 2021-03-29T23:53:53+02:00

Jean Marc MONS commented

2021-03-29 23:53:53 +02:00

System Information
Operating system: Win 10
Graphics card: Twin GTX 1070

Blender Version
Broken: 2.92
Worked: 2.91

Fluid sim inside properly meshed objects does not work at all

Create a tube with a curb or a Cylinder,
add a solidify modifier and apply it,
put a icosphere and downscale it to fit inside the tube,
keep icosphere selected and go to Object -> Quick Effects -> Quick Liquid.
scale the domain to fit everything inside.
Use tube as effector (planar or not does not work either way)
Try to bake a sim.
All settings that used to work in 2.93 and 2.91 do not work AT ALL in 2.92. Looks like it considers the mesh as a closed object.

Thanks in advance

**System Information** Operating system: Win 10 Graphics card: Twin GTX 1070 **Blender Version** Broken: 2.92 Worked: 2.91 **Fluid sim inside properly meshed objects does not work at all** - Create a tube with a curb or a Cylinder, - add a solidify modifier and apply it, - put a icosphere and downscale it to fit inside the tube, - keep icosphere selected and go to Object -> Quick Effects -> Quick Liquid. - scale the domain to fit everything inside. - Use tube as effector (planar or not does not work either way) - Try to bake a sim. All settings that used to work in 2.93 and 2.91 do not work AT ALL in 2.92. Looks like it considers the mesh as a closed object. Thanks in advance

Jean Marc MONS commented

2021-03-29 23:53:53 +02:00

Added subscriber: @Loulou_972

Falk David commented

2021-03-30 10:26:25 +02:00

Added subscriber: @filedescriptor

Falk David commented

2021-03-30 10:26:25 +02:00

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

Falk David commented

2021-03-30 10:26:25 +02:00

@Loulou_972 It would be very helpful if you could provide the test .blend file. You can edit the task and upload it via drag & drop. Thank you.

@Loulou_972 It would be very helpful if you could provide the test `.blend` file. You can edit the task and upload it via drag & drop. Thank you.

Jean Marc MONS commented

2021-03-30 14:12:49 +02:00

Hi David

Attached is the test file

Thanks test liquide pe1.blend

Hi David Attached is the test file Thanks [test liquide pe1.blend](https://archive.blender.org/developer/F9914518/test_liquide_pe1.blend)

Jean Marc MONS commented

2021-03-30 14:26:27 +02:00

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

Jean Marc MONS closed this issue

2021-03-30 14:26:27 +02:00

Jean Marc MONS self-assigned this 2021-03-30 14:26:27 +02:00

Jean Marc MONS commented

2021-03-30 14:26:27 +02:00

Hi David

Found out a solution for that specific issue, ramp up the Resolution Division to 200 Minimum solves the issue, but that is A LOT compare to what is feasable in 2.83 LTS

Also, the issue remains UNSOLVED for closed Mesh.

I have attached another blend that worked perfectly fine in 2.83 LTS, but does not in 2.92, unless you "break" open the mesh by cutting out a piece. For that specific issue, even ramping up the Resolution to 300 does not solve it.

Thanks again

Cheers

Hi David Found out a solution for that specific issue, ramp up the Resolution Division to 200 Minimum solves the issue, but that is A LOT compare to what is feasable in 2.83 LTS Also, the issue remains UNSOLVED for closed Mesh. I have attached another blend that worked perfectly fine in 2.83 LTS, but does not in 2.92, unless you "break" open the mesh by cutting out a piece. For that specific issue, even ramping up the Resolution to 300 does not solve it. Thanks again Cheers

Jean Marc MONS was unassigned by Falk David

2021-03-31 13:14:52 +02:00

Falk David commented

2021-03-31 13:14:52 +02:00

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

Falk David reopened this issue

2021-03-31 13:14:52 +02:00

Falk David commented

2021-03-31 13:14:52 +02:00

@Loulou_972 I will keep this task open for now. From what I understand there seems to be a regression in the simulator so this will have to be investigated further. If there is a workaround then that does not mean, that the task can be marked as resolved.

Germano Cavalcante commented

2021-04-01 23:29:42 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2021-04-01 23:29:42 +02:00

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

Germano Cavalcante commented

2021-04-01 23:29:42 +02:00

I don't know if it's the same problem reported, but in my case the simulation crashes.
This is the file I used:
quick_fluid_crash.blend

If it is not the same problem, it must be related, so I am confirming the bug.

I don't know if it's the same problem reported, but in my case the simulation crashes. This is the file I used: [quick_fluid_crash.blend](https://archive.blender.org/developer/F9917235/quick_fluid_crash.blend) If it is not the same problem, it must be related, so I am confirming the bug.

Jason commented

2021-06-13 07:17:37 +02:00

Added subscriber: @JasonHorkles

Jason commented

2021-06-13 07:23:43 +02:00

The only time it seems to work is if the fluid shape is both inside and outside the effector
Works normally from my testing on 2.83.15 but not 2.93.0 nor 3.0.0
Fluid.blend

The only time it seems to work is if the fluid shape is both inside and outside the effector Works normally from my testing on 2.83.15 but not 2.93.0 nor 3.0.0 [Fluid.blend](https://archive.blender.org/developer/F10169008/Fluid.blend)

Stephen commented

2021-07-14 17:07:13 +02:00

Added subscriber: @stephen_pearson

Stephen commented

2021-07-14 17:17:33 +02:00

Same here. 2.83 works perfectly fine but once you jump to 2.90+ or 3.0.0 the fluid no longer simulates. I've tried so many variations to see if I can figure out a solution but nothing is working. In 2.83 flipping the normals to the inside of the mesh works but not in 2.9 or 3.0.0 The only way 2.9 can simulate fluid inside a mesh is if you cut a hole somewhere on the mesh. It also depends on the size of the hole, if it's to small it won't work.

Is this suppose to act this way or is it a bug?

Same here. 2.83 works perfectly fine but once you jump to 2.90+ or 3.0.0 the fluid no longer simulates. I've tried so many variations to see if I can figure out a solution but nothing is working. In 2.83 flipping the normals to the inside of the mesh works but not in 2.9 or 3.0.0 The only way 2.9 can simulate fluid inside a mesh is if you cut a hole somewhere on the mesh. It also depends on the size of the hole, if it's to small it won't work. Is this suppose to act this way or is it a bug?

Philipp Oeser removed the

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Issues with Fluid sim INSIDE objects #87029