change particle speed "between two constants" via script

The speed of particles in my scene depend on a variable.
It works like a charm to use

Code (JavaScript):

1. particleSystem.startSpeed = LevelSpeed/20;

But what I actually want is to use the "Start Speed -> Random between two constants" property as found in the particle editor. Can't find out how to change those values through scripting (js).

Something like:
particleSystem.startSpeed.ConstantA = LevelSpeed/20;
particleSystem.startSpeed.ConstantB = LevelSpeed/30;

I could work around it by creating a second particle system or attach a script to the particle itself … but the above solution would be a lot smoother (at least that's how it appears to me).

 

Why not use Random.Range?

 

do you mean like

particleSystem.startSpeed = Random.Range(x,y) ?

unfortunately that just takes ONE random number and applies it to all particles.
any way I can talk to each emmitted particle?

 

I tested it and changing the startSpeed changes the upper limit while keeping the ratio.

If your original startSpeed was constant between 1 and 2 and you did:

Code (csharp):

1.  
2. emittor.startSpeed = 10;
3.  

the new startSpeeds are now between 5 and 10.

Hope this helps.

 

if that helps?
it actually solves the whole problem! thanks so much!

(I was actually sure I already tried that)

 

To anyone who found this post, ParticleSystem.startSpeed is now depreciated. Instead, you'll need to set the startSpeed of the ParticleSystem.MainModule as a MinMaxCurve instead:

Code (CSharp):

1. ParticleSystem p = GetComponent<ParticleSystem>();
2. var v = p.main;
3. v.startSpeed = new ParticleSystem.MinMaxCurve(5, 10);

 

Thank you this worked perfectly!

 

This thread helped me find ParticleSystem.MinMaxCurve(), which helped me find my solution, so I thought I'd post my solution here. (I was doing basically the same thing but for startRotation)

Code (CSharp):

1. ParticleSystem ps = GetComponent<ParticleSystem>();
2. ps.Stop();
3. ParticleSystem.MainModule psm = ps.main;
4.  
5. ParticleSystem.MinMaxCurve psmmc = new ParticleSystem.MinMaxCurve(0.0f, Mathf.Deg2Rad * 360.0f);
6. psmmc.mode = ParticleSystemCurveMode.TwoConstants;
7.  
8. psm.startRotation = psmmc;    //This would be startSpeed for you, also your MinMaxValues would be for speed instead of rotation, which doesn't need radians
9. //Insert whatever else you need to change
10. ps.Play();