Sphere interacting with a 'particle field'

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Old 07 July 2006   #1
Sphere interacting with a 'particle field'

I've seen it somewhere before, but I can't find it anymore. I've got a plane with particles positioned at every vertex. Now there's a sphere which passes the plane lets say from left to right... The sphere has to push the particles away, but in a smooth way (like there's some kind of 'fallof' attached to the outside of the sphere... or like what 'soft-selection' does when selecting something in a mesh...). After they have been pushed aside, and the sphere has left that area, they should go back to their initial state...
Portfolio: http://users.telenet.be/sorgeloos/portfolio
Old 07 July 2006   #2
The simple way is to link a Wind SW to the sphere then assign it as a force to the particles. Then turn up the Decay value on the SW and it will attenuate the effect. Be careful though as the values are very sensitive (start with 0.001 and go from there).
-Brandon Davis
Old 07 July 2006   #3
Ok, this works great! But... only in one frame. I'll explain. I add the wind SW but at frame 0, nothing happens. So when I move the timeline to lets say 50, I get the desired effect, but that makes it not animatable. Only when 'in frame 50' I start moving my SW by hand, I get the effect I want on screen. Moving back or further in time only makes the 'pushing effect' less or more stronger. (Because the wind keeps blowing off course...)
Deflectors, PBombs,... none of them seem to do what I want to achieve...

I hope I'm clear on this, otherwise, just ask and I'll post some screenshots.
Portfolio: http://users.telenet.be/sorgeloos/portfolio

Last edited by 3D_me : 07 July 2006 at 10:14 AM.
Old 07 July 2006   #4
Maybe something like this?

Details are here - http://www.orbaz.com/forum/viewtopic.php?t=703 - it uses PFTools:Box#3 for the effect.

Oleg B.
More about Particle Flow at Orbaz Forum
Old 07 July 2006   #5
That's almost what I'm looking for. In this screencap you can see what exactly I'm trying to get, but animatable (animating the wind movement, and freezing what it has blown yet...)


If possible I'd like to get the result without using 3rd-party software. It's not realy a cutting edge particle job, so the investement for extra software to get it done seems a bit overkill. (Although I have to admit the PFtoolboxes look quite usefull for heavy particle work...)

Just for the record, I don't have to get the job done with particles, if there's another option I'm overlooking... fine for me.
Portfolio: http://users.telenet.be/sorgeloos/portfolio
Old 07 July 2006   #6

hi ,

I am really interested in "PFTools:Box#3" where can I get it ?
Is it a freeware ?
Old 07 July 2006   #7
Quote: I am really interested in "PFTools:Box#3" where can I get it ?

PFTools:Box#3 - http://www.orbaz.com/forum/viewtopic.php?t=464

Oleg B.
More about Particle Flow at Orbaz Forum
Old 07 July 2006   #8
So even when you change the Decay value of the Wind, it still affects all particles the same? It's really a no brainer. You have spherical wind that pushes particles away from the center of the space warp. You have that space warp linked to the location of the object moving through the particles. Then you adjust the Decay value to attenuate the strength of the wind based on how far particles are from the center point of the space warp.

That's it, unless I'm totally missing something.
-Brandon Davis
Old 07 July 2006   #9
I'm afraid you're totally missing something No offence on that, because it's probably mainly my mistake...

What I want as a result is an animation of particles of the grid being pushed away by some kind of spherical 'force/object/...'. The pushing away has to take place in a decayed way.
What I'm showing in my screencap is that the action that takes place in frame 50 (me moving the Wind SW by hand) should take place in an animated way between frame 0 and 100.
Now, and that's what I'm showing when moving the timeslider, when time moves on, only the effect of wind, constantly blowing (a not desirable effect), is seen in the animation. Somehow I'd like to 'freeze' the windforce on what it is on frame 50 and work with that 'object' in the whole animation.

Thanks anyway to have taken some time to take a look at my problem...
Portfolio: http://users.telenet.be/sorgeloos/portfolio
Old 07 July 2006   #10
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