Random moving particles

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tobitobsen

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Random moving particles

Hello.

I am rather new to Cheetah and already have a small problem. I'd like to have particles (e.g. from a particle array) to move randomly over time. I could achieve this by changing the random seed over time, but unfortunately, in the key editor, I can't record the random seed. I am sure that there is probably another solution to my problem, and I would be really glad about any hint or help.

Thanks a lot!
 
Hi and welcome.
I´m not sure what you´re expecting from a key-framed random order and what you´re doing with the "Particle array" in this context?
Maybe post your scene or an example showing what you´re after.

Cheers
Frank
 
Hi.

Thanks for the welcome. I attached a simple example file. As you can see, I create spheres irregularly distributed. Now, I'd like to create an animation where each sphere moves randomly around its initial position (e.g. +- 0.1 in x,y and z direction). I realised that my previously posted idea would not work anyway... but as I said, there is probably an easy way to achieve that, that I just do not think of.

Thanks a again for the welcome and the fast reply.
 

Attachments

  • exampleParticles.zip
    6.5 KB · Views: 326
The particle array is part of the instancing system so you need the particle emitter.
I attached a modified scene from the help->example files-> Particles

Lets see how far you can get with this.

Cheers
Frank
 

Attachments

  • EmitterStationary.jas.zip
    10.8 KB · Views: 324
Hello Frank.

Thanks for the answer.

A particle emitter is not quite what I am looking for, because:

- I want to keep the number of particles constant over time. Let's say, I start with 50 particles.
- I want the particles to move around their initial position. Which means the particles would stay more or less within the initial bounding box.

Thanks for the answer, anyway.
 
Ah - ok - I think I understand it more clearly now. Look at this set up then:

Cheers
Frank
 

Attachments

  • ParticleLimbo.jas.zip
    7 KB · Views: 315
Hey.

Yep, that's getting close...

But: What exactly are you doing in your file? I see you rotate the Polyhedra, but did you also offset the coord system? And if yes, how did you do that?

Thanks for your help... and your patience!
 
Glad I´m on the right track. :p
For the offset I simply make the "particle" editable - select all points or polygons and move them away from x,y,z=0. I now key-framed the rotation in object mode.

Cheers
Frank
 
Very nice!!!

The only thing missing is now a 'random' component. What I mean is one can directly see that all particles move 'in-sync', i.e. they all make the same rotation. Any idea how to add that?
 
You can add a bunch of particles with it´s own tags to the particle array to make it more random looking:

Cheers
Frank
 

Attachments

  • ParticleJitterbug.jas.zip
    31.2 KB · Views: 331
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