FORCE FIELDS How?

[Animaticoide]

Hello, does any one know how to implement Force Fields in 2.5? At least a basic clue how to start it? Or if you know a tutorial about this, greatly appreciated.

For what I have read it works for sofbody meshes only? Also for particles?

See the screen shot of what I mean.

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[stuart.t]

Check http://blenderguru.com/ there is one for a flag.

Also followed one about creating a 7 up advert, sure you can find it on google. It was based on .49b but easily transferable to 2.54.

[wysiwyg]

Force fields affect particle systems. to get you started:

1. add a plane
2. go to the particles buttons and add a new system, crank up the norm setting a bit
   (note: i dont know what your knowledge level is in blender so if you need clarification just ask)
3. Add a Magnetic Forcefield, move it a little away from the emitter plane and playback the animation. the particles should be attracted to the Forcefield. experiment with all the different types.
   hope this helps!

eidt: oh and yes they can be used for cloth modifiers, for example wind on a flag

[Animaticoide]

@Stuart.t:
Thanks for pointing out that tutorial. It is a good one and very easy setup.

@WYIWYouGet:

Thanks for this quick intro to get started. However it does not look that simple or may be I am missing some basic setup. I am trying to create a fire ( like dragon ) so that’s why I need some force field. See the shots, I added a magnetic Field ( Shift A ), play with its parameters Strength etc but I do not see any influence on the fire.

Also,the domain panel has an option to add a force Field displaying the same options as for Shift A ( Wind, Magnetic etc) what is the difference? ( From adding the force by using shift-A ?) Also this option is available for the particle system ! Hmm that sound a bit confusing. Look at the shots, the fire goes up all the time.
(PS: Fire was rendered in Low Res, default 32 and just 10.000 particles to save time.)

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[delic]

I would first setup a couple of particle systems as I want, with force fields, then try to get the fire of it with the domain etc …
Not a smoke guru talking here.

edit :
point density texture ?

[Animaticoide]

@delic

I would first setup a couple of particle systems as I want, with force fields, then try to get the fire of it with the domain etc …
Not a smoke guru talking here.

edit :
point density texture ?

Thanks for your reply.
I know how to create realistic fire, that won’t be a problem at all. The thing is I want that fire to obey any Force Field added with Shift-A. Let’s imagine a simple magnetic field, or a wind blowing at it.:eek:

[Ecrivain (Écrivain)]

@Animaticoide

The thing is I want that fire to obey any Force Field added with Shift-A. Let’s imagine a simple magnetic field, or a wind blowing at it.:eek:

It does, just raise the strength of the forcefield (physics tab.) If you don’t want the smoke to rise zero it’s heat and gravity.

[Animaticoide]

@Écrivain

It does, just raise the strength of the forcefield (physics tab.) If you don’t want the smoke to rise zero it’s heat and gravity.

Yeap beautiful, thanks. I think I can take it from here. I got a feel of how it works. My only concern is why to have another option inside the domain and particles’ panel to add a force field? Well, no big deal just to know.

Also, if you press ALT-A and later you move your force to somewhere, rewind the animation and press ALT-A, it simulates the same thing. You have to move the domain or just press G in order to be reconsidered the new Force Position. This is not the case when hitting BAKE which seems to work differently. Well anyways I got something thanks to everyone !

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[Ecrivain (Écrivain)]

All objects have the ability to be a force field using the ‘Force Fields’ panel (when adding a force field with Shift + A it just creates an Empty with a force field setting.)

The ‘Smoke Field Weights’ and ‘Field Weights’ (particles) panels lets you tweak how much the smoke/particles are affected by the different types of force fields.

The ‘Force Field Settings’ under particles lets particles affect themselves.

[Paint_Guy]

Hi, I hope you don’t mind if I ask a question here.

I have an emitter with 4000 particles and have selected “Smoke > Domain” and have zeroed the heat and gravity. Do I need to adjust any settings in the “Smoke Field Weights”? Right now it just looks all white what else do I need to do to get it to look like fire? (see image)

Also Animaticoid, you said: (PS: Fire was rendered in Low Res, default 32 and just 10.000 particles to save time.) Did you bake this first and how long did it take?

pg

[Animaticoide]

I am posting this file here so you can see how the fire was made. You know too many parameters. At glance: Heat makes your smoke go up, gravity makes it go down. So you play with these two values and see where your fire goes. Zero to both don’t make much sense to me.

Also, it seems you are rendering the particles as halo? Well you must set NO TO RENDER the particles, so the smoke is created. Also you need to add a volumetric material to the domain with two textures, density and emission. You take a look at the file and see for yourself all the settings, then you are welcome to ask here any particular setting.

yes, 32 divisions, high Resolution = disabled with 10.000 particles takes just a few seconds, 200 frames. the good fire comes with 64 divisions, high resolution enabled with 1 or 2 divisions, then it takes a few minutes to bake. Just use this setting when sure.

Be aware that we are on 2.5.

http://www.mediafire.com/file/d3kecqvj9mxur1g/fire_sampleLOW.blend