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Assets/Standard Assets/Utility/ParticleSystemDestroyer.cs

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+using System;
+using System.Collections;
+using UnityEngine;
+using Random = UnityEngine.Random;
+
+namespace UnityStandardAssets.Utility
+{
+    public class ParticleSystemDestroyer : MonoBehaviour
+    {
+        // allows a particle system to exist for a specified duration,
+        // then shuts off emission, and waits for all particles to expire
+        // before destroying the gameObject
+
+        public float minDuration = 8;
+        public float maxDuration = 10;
+
+        private float m_MaxLifetime;
+        private bool m_EarlyStop;
+
+
+        private IEnumerator Start()
+        {
+            var systems = GetComponentsInChildren<ParticleSystem>();
+
+            // find out the maximum lifetime of any particles in this effect
+            foreach (var system in systems)
+            {
+                m_MaxLifetime = Mathf.Max(system.main.startLifetime.constant, m_MaxLifetime);
+            }
+
+            // wait for random duration
+
+            float stopTime = Time.time + Random.Range(minDuration, maxDuration);
+
+            while (Time.time < stopTime && !m_EarlyStop)
+            {
+                yield return null;
+            }
+            Debug.Log("stopping " + name);
+
+            // turn off emission
+            foreach (var system in systems)
+            {
+                var emission = system.emission;
+                emission.enabled = false;
+            }
+            BroadcastMessage("Extinguish", SendMessageOptions.DontRequireReceiver);
+
+            // wait for any remaining particles to expire
+            yield return new WaitForSeconds(m_MaxLifetime);
+
+            Destroy(gameObject);
+        }
+
+
+        public void Stop()
+        {
+            // stops the particle system early
+            m_EarlyStop = true;
+        }
+    }
+}