How do you make random local velocity for particles?

Question

I'm pretty new to Unity and found I couldn't make the particle effect I was going for (using a particle emitter component) without random local velocity. My first thought was to make a script adding values which would translate to world values then be added to the existing rndVelocity options. I can't figure out how to do it though. This is what I tried:

var rndLocalVelX : float = 0; var rndLocalVelY : float = 0; var rndLocalVelZ : float = 0; var particlez : ParticleEmitter; var relativeDirection : Vector3;

function Start () { var randomAdd : Vector3; randomAdd = Vector3( rndLocalVelX, rndLocalVelY, rndLocalVelZ);

 relativeDirection = transform.TransformDirection(randomAdd);

 particlez = GetComponent(ParticleEmitter);

 //adding a random value to local velocity:
 particlez.rndVelocity += relativeDirection;

}

Answer 1

Answer by Tobs 1 · Feb 09, 2011 at 12:42 PM

do you need to add positive and negative velocity? If so, use Random.Range(min, max)

randomAdd = Vector3(Random.Range(-rndLocalVelX, rndLocalVelX), Random.Range(-rndLocalVelY, rndLocalVelY), Random.Range(-rndLocalVelZ, rndLocalVelZ));

you would set this as Velocity instead of rndVelocity ofcourse

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Answer 2

Answer by runevision · Feb 09, 2011 at 12:04 PM

I don't understand what you're trying to do, but anyway, the variable called Rnd Velocity is already local random velocity. So you can just set that value directly.

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How do you make random local velocity for particles?

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