How to prevent particle system from restarting when value changes from script?

Questions & Answers
1

Whenever I change my particle system values from the script during runtime the particle system starts from scratch but I don’t want it to restart I want it to continue from where its values are changed.

2

You cannot modify the “System” and expect it to affect the “[Particles][1]” which have already been emitted. Instead you need to [get][2] and [set][3] each particle individually in a loop:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class MoveParticle : MonoBehaviour
{
    public ParticleSystem _ps;
    ParticleSystem.MainModule _ps_main;
	ParticleSystem.Particle[] _p;
	public float _speed = 5f;
	int numParticlesAlive;
	
    void Awake()
    {
        _ps = this.GetComponent<ParticleSystem>();
	    _ps_main = _ps.main;
	    _p = new ParticleSystem.Particle[_ps_main.maxParticles];
    }

    public void StartParticle()
    {
	    numParticlesAlive = _ps.GetParticles(_p);
	    for (int i = 0; i < numParticlesAlive; i++)
	    {
		    _p*.velocity = new Vector3(0f, 0f, _speed);*

  •  }*

  •  _ps.SetParticles(_p, numParticlesAlive);*

}

public void ResetParticle()
{
_ps.Stop();
_ps.Play();
}
}
[1]: Unity - Scripting API: Particle
[2]: Unity - Scripting API: ParticleSystem.GetParticles
[3]: Unity - Scripting API: ParticleSystem.SetParticles