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Dr BeN
04-25-2002, 12:18 AM
Hi
i got a problem

i want a cloud of particles to rotate like ... err a galaxy ... but my vertex field always drives them apart ... what can i do ... that they only rotate but not drive apart ?

add another field ?? keep them in place with an expression ? anyone got any idea ?


c'ya

and thx:bounce:

gaiXyn
04-25-2002, 05:36 AM
well adding another field might help....but you'll have to tweak the settings to get the desired effect....I suggest using the vortex....but stoping the animation at the moment where you like what you see...and using the particle solver to keep the particles in that position and then detete the fields and then rotate as usual.....or better yet....you can use the "Draw Particle" Tool to draw the basic shape of your particles and then simple rotate it as you would with any other object......

Hope that helped....

peaCe :buttrock:

NickolasYounker
04-25-2002, 10:22 AM
make a partical grid, create vortex or radial(yourpref) let the simulation take place, but when you get to the frame that you like how the shape is looking. press stop.... freeze everything/break connection of the field and the partical grid.....and whala you have agalaxy shape that is rotatable/animatable through its center axis.

alexx
04-26-2002, 02:27 PM
to create the particles i would model a rough poly galaxy, smooth it and let this one emit particles from the surface of the poly geometry.

after particles are emitted, freeze the movement and emission by setting an initial state for the particles after setting their speeds to 0 in the component editor.

now you can use a vortex to move them with different speeds (center slow, outside faster).
to prevent them spreading to infinity either create a volume field that has a falloff to the edges (cylinder volume in this case) or the better solution (for most particle animations btw) is to tweak the conserve value from the particles.
with a conserve value of 1 (default) particles accumulate the forces they get in each frame which makes them faster from frame to frame. lowering this value helps in most cases.

e.g.: try setting the conserve to 0. now increase the magnitude of your fields a LOT. and see.. does mostly what you need.

but honestly.. it is a lot of playing with parameters. changing one makes you change another one... :)

Dr BeN
04-27-2002, 10:45 PM
yea now i got it it was the "set conserv to 0 " what i wanted to know ;) htx for the help !

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