Mantaflow: emit smoke from particles can't inherit velocity. #88257

New Issue

jianzwan · 2021-05-13T16:58:16+02:00

jianzwan commented

2021-05-13 16:58:16 +02:00

Operating system: windows 10
Graphics card:

Blender Version
Broken: 2.92
Worked: 2.83

Short description of error
Emit smoke from particles can't inherit velocity.
volume speed bug.blend

2.90.0

2.91

Operating system: windows 10 Graphics card: **Blender Version** Broken: 2.92 Worked: 2.83 **Short description of error** Emit smoke from particles can't inherit velocity. [volume speed bug.blend](https://archive.blender.org/developer/F10094387/volume_speed_bug.blend) ![volume bug.png](https://archive.blender.org/developer/F10094368/volume_bug.png) 2.90.0 ![image.png](https://archive.blender.org/developer/F10295969/image.png) 2.91 ![image.png](https://archive.blender.org/developer/F10295971/image.png)

jianzwan commented

2021-05-13 16:58:16 +02:00

Added subscriber: @An_Zi

blender-admin commented

2021-05-13 16:58:16 +02:00

#90784 was marked as duplicate of this issue

blender-admin commented

2021-05-13 16:58:16 +02:00

#84001 was marked as duplicate of this issue

Richard Antalik commented

2021-05-13 22:08:31 +02:00

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

Fernando Alcala commented

2021-05-14 19:24:13 +02:00

Added subscriber: @Fernando-Alcala

Fernando Alcala commented

2021-05-14 19:24:13 +02:00

Same as #84001

Ankit Meel commented

2021-06-18 19:59:27 +02:00

Added subscribers: @Druzian, @kubagrodzki, @EitanSomething, @lichtwerk, @sebbas, @rjg

Ankit Meel commented

2021-06-18 19:59:31 +02:00

Added subscriber: @ankitm

Philipp Oeser commented

2021-08-20 13:46:39 +02:00

Added subscribers: @VirtusH, @PratikPB2123

Philipp Oeser commented

2021-08-20 13:47:52 +02:00

Will try to check which commit broke this, but would already assume this deserves high priority

Philipp Oeser changed title from ~~Emit smoke from particles can't inherit velocity.~~ to Mantaflow: emit smoke from particles can't inherit velocity.

2021-08-20 13:55:31 +02:00

Sebastián Barschkis was assigned by Philipp Oeser

2021-08-20 14:22:57 +02:00

Philipp Oeser commented

2021-08-20 14:22:57 +02:00

@sebbas: can you check this?

David DeLuca commented

2021-09-05 15:49:58 +02:00

Added subscriber: @Dd3d

David DeLuca commented

2021-09-05 15:49:58 +02:00

I think this is the same issue that I have, but from another angle:

Working with liquids, the limitation seems to be specific to the case that the flow behavior is set to geometry . If I set the flow behavior to geometry, and check the box for "initial velocity", the particles do NOT inherit the velocity of the object that spawns them. However, if I set the flow behavior to inflow, then the initial velocity check box works as expected, and all the particles do inherit the object's velocity.

I think this is the same issue that I have, but from another angle: Working with liquids, the limitation seems to be specific to the case that the flow behavior is set to **geometry** . If I set the flow behavior to **geometry**, and check the box for "initial velocity", the particles do NOT inherit the velocity of the object that spawns them. However, if I set the flow behavior to **inflow**, then the initial velocity check box works as expected, and all the particles do inherit the object's velocity.

Fernando Alcala commented

2021-09-05 22:22:38 +02:00

source 0
manta liquid inflow source 00001-0100.mp4
source 1
manta liquid inflow source 10001-0100.mp4
source 2
manta liquid inflow source 20001-0100.mp4
reason 52 why mantaflow sucks: mantaflow geometry
manta liquid geo source 1000001-0100.mp4
flipfluids geometry
manta liquid flipfluid geo source 10001-0100.mp4

source 0 [manta liquid inflow source 00001-0100.mp4](https://archive.blender.org/developer/F10379743/manta_liquid_inflow_source_00001-0100.mp4) source 1 [manta liquid inflow source 10001-0100.mp4](https://archive.blender.org/developer/F10379744/manta_liquid_inflow_source_10001-0100.mp4) source 2 [manta liquid inflow source 20001-0100.mp4](https://archive.blender.org/developer/F10379745/manta_liquid_inflow_source_20001-0100.mp4) reason 52 why mantaflow sucks: mantaflow geometry [manta liquid geo source 1000001-0100.mp4](https://archive.blender.org/developer/F10379742/manta_liquid_geo_source_1000001-0100.mp4) flipfluids geometry [manta liquid flipfluid geo source 10001-0100.mp4](https://archive.blender.org/developer/F10379791/manta_liquid_flipfluid_geo_source_10001-0100.mp4)

Dalai Felinto commented

2021-12-23 14:58:52 +01:00

Added subscriber: @dfelinto

Dalai Felinto commented

2021-12-24 13:03:35 +01:00

At the moment there is no one actively maintaining Mantaflow (and its integration with Blender). I'm moving this to Known Issue.

Philipp Oeser removed the

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Mantaflow: emit smoke from particles can't inherit velocity. #88257