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'Force' 'Every Point' force field does not effect smoke properly #44583

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opened 2015-05-02 05:39:55 +02:00 by Kalcifer Kandari · 10 comments
Kalcifer Kandari commented 2015-05-02 05:39:55 +02:00
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System Information
MacBook Pro (17-inch, Mid 2010)
Processor: 2.66 GHz Intel Core i7
Memory: 8 GB 1067 MHz DDR3
Graphics: NVIDIA GeForce GT 330M 512 MB

Blender Version
Blender 2.74

Short description of error
'Force' 'Every Point' force field behaves in the same way as the 'Force' 'Point' force field when used as a 'Smoke Field Weight' on smoke domains. Smoke flows towards the origin of the particle emitter (when strength is set to a negative value).

smoke_every_point_example.blend

Exact steps for others to reproduce the error

  • Open blender with factory start-up file
  • Select 'cube'
  • Object -> Quick Effects -> Quick Smoke
  • Select 'cube'

Particles -> New

- Emission
  - Number -> 50
  - End -> 1
  - Emit From -> Volume
- Physics -> No

Physics -> Smoke -> Flow

  - Flow Source -> Particle System
  - Particle System -> ParticleSystem
  - Temp. Diff. -> 0
  • Add -> Mesh -> Cube
  • Object -> Scale -> 4
  • Adjust size of 'Smoke Domain' and move 'Cube.001' somewhere inside it away from 'Cube'
  • Particles -> New
    • Emission
      • Number -> 200
      • End 1
      • Emit From -> Volume
    • Physics -> No

Physics -> Force -> Every Point

- Strength -> -8
  • Select 'Smoke Domain' cube
  • Physics
    • Smoke
      • Density -> 0
      • Temp. -> 0
    • Smoke Field Weights
      • Effector Group -> Group
  • Play animation
**System Information** MacBook Pro (17-inch, Mid 2010) Processor: 2.66 GHz Intel Core i7 Memory: 8 GB 1067 MHz DDR3 Graphics: NVIDIA GeForce GT 330M 512 MB **Blender Version** Blender 2.74 **Short description of error** 'Force' 'Every Point' force field behaves in the same way as the 'Force' 'Point' force field when used as a 'Smoke Field Weight' on smoke domains. Smoke flows towards the origin of the particle emitter (when strength is set to a negative value). [smoke_every_point_example.blend](https://archive.blender.org/developer/F169227/smoke_every_point_example.blend) **Exact steps for others to reproduce the error** - Open blender with factory start-up file - Select 'cube' - Object -> Quick Effects -> Quick Smoke - Select 'cube' # Particles -> New - Emission - Number -> 50 - End -> 1 - Emit From -> Volume - Physics -> No # Physics -> Smoke -> Flow - Flow Source -> Particle System - Particle System -> ParticleSystem - Temp. Diff. -> 0 - Add -> Mesh -> Cube - Object -> Scale -> 4 - Adjust size of 'Smoke Domain' and move 'Cube.001' somewhere inside it away from 'Cube' - Particles -> New - Emission - Number -> 200 - End 1 - Emit From -> Volume - Physics -> No # Physics -> Force -> Every Point - Strength -> -8 - Select 'Smoke Domain' cube - Physics - Smoke - Density -> 0 - Temp. -> 0 - Smoke Field Weights - Effector Group -> Group - Play animation
Kalcifer Kandari commented 2015-05-02 05:39:55 +02:00
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Changed status to: 'Open'

Changed status to: 'Open'
Kalcifer Kandari commented 2015-05-02 05:39:55 +02:00
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Added subscriber: @KalciferKandari

Added subscriber: @KalciferKandari
Bastien Montagne commented 2015-05-06 11:00:58 +02:00
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Added subscribers: @LukasTonne, @genscher, @miikah, @mont29

Added subscribers: @LukasTonne, @genscher, @miikah, @mont29
Bastien Montagne commented 2015-05-06 11:00:58 +02:00
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I would assume this is the same as with curve force field - not all forces are supported by 'grid-based' simulations?

I would assume this is the same as with curve force field - not all forces are supported by 'grid-based' simulations?
Kalcifer Kandari commented 2015-05-06 11:15:01 +02:00
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Smoke can be attracted to 'Force' 'Point', there is no reason particles cannot be treated in the same way.

Smoke can be attracted to 'Force' 'Point', there is no reason particles cannot be treated in the same way.
Kalcifer Kandari commented 2015-05-17 17:36:28 +02:00
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Could a dev confirm this bug?

Could a dev confirm this bug?
ronan ducluzeau commented 2015-09-15 12:28:40 +02:00
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Added subscriber: @zeauro

Added subscriber: @zeauro
ronan ducluzeau commented 2015-09-15 12:28:40 +02:00
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In .blend of report, center of mesh correspond to origin of object.
If origin of object is not at same place that mesh; it is obvious that an EveryPoint force does not behaves like a Point force.
smoke_ep_correct.blend

There is no bug.

Every point shape is relative to mesh vertices, not particles.
Force_Field_EP.blend
For particles, there is a force field settings panel in particle settings.

In .blend of report, center of mesh correspond to origin of object. If origin of object is not at same place that mesh; it is obvious that an EveryPoint force does not behaves like a Point force. [smoke_ep_correct.blend](https://archive.blender.org/developer/F233408/smoke_ep_correct.blend) There is no bug. Every point shape is relative to mesh vertices, not particles. [Force_Field_EP.blend](https://archive.blender.org/developer/F233411/Force_Field_EP.blend) For particles, there is a force field settings panel in particle settings.
Lukas Tönne commented 2015-09-15 12:50:00 +02:00
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Changed status from 'Open' to: 'Archived'

Changed status from 'Open' to: 'Archived'
Lukas Tönne self-assigned this 2015-09-15 12:50:00 +02:00
Lukas Tönne commented 2015-09-15 12:50:00 +02:00
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Try using a force falloff of 2 (and a large strength of ~500 to compensate for falloff).

When using no falloff the forces of all the particles accumulate regardless of their distance, which leads to an effective force that is basically the same as a single point force. Especially when the density of attractors (particles) is high compared to the grid resolution, it will be difficult to see any small scale deviations from such an overall centered radial force.

Try using a force falloff of 2 (and a large strength of ~500 to compensate for falloff). When using no falloff the forces of all the particles accumulate regardless of their distance, which leads to an *effective force* that is basically the same as a single point force. Especially when the density of attractors (particles) is high compared to the grid resolution, it will be difficult to see any small scale deviations from such an overall centered radial force.
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Reference: blender/blender#44583
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