ParticleMagnet / Particle Attractor

ParticleMagnet

using UnityEngine;

/// <summary>
/// Particle Attractor
/// </summary>
[AddComponentMenu("NVenti/ParticleMagnet")]
public class ParticleMagnet : MonoBehaviour
{
    public ParticleSystem System;

    public Transform MagnetPoint;

    public float Delay = 1;

    public bool AutoPlay = true;

    public bool Looping = true;

    protected float delta;

    [ContextMenu("Play")]
    public void Play()
    {
        delta = 0;
        System.Play();

    }

    void Start()
    {
        if (AutoPlay)
        {
            Play();
        }
    }

    void Update()
    {
        delta += Time.deltaTime;

        //pause
        if (delta < Delay)
        {
            return;
        }

        ParticleSystem.Particle[] ps = new ParticleSystem.Particle[System.particleCount];

        System.GetParticles(ps);

        for (int i = 0;i < ps.Length;i++)
        {
            ps[i].velocity = Vector3.Lerp(ps[i].velocity, (MagnetPoint.position - ps[i].position).normalized, 0.1f);
        }

        System.SetParticles(ps, ps.Length);

        if (Looping)
        {
            //reset
            if (delta > System.duration)
            {
                Play();
            }
        }
        else
        {
            enabled = false;
        }
    }
}