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Assets/Standard Assets/ParticleSystems/Scripts/Explosive.cs

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+using System;
+using System.Collections;
+using UnityEngine;
+using UnityStandardAssets.Utility;
+
+namespace UnityStandardAssets.Effects
+{
+    public class Explosive : MonoBehaviour
+    {
+        public Transform explosionPrefab;
+        public float detonationImpactVelocity = 10;
+        public float sizeMultiplier = 1;
+        public bool reset = true;
+        public float resetTimeDelay = 10;
+
+        private bool m_Exploded;
+        private ObjectResetter m_ObjectResetter;
+
+
+        // implementing one method from monobehviour to ensure that the enable/disable tickbox appears in the inspector
+        private void Start()
+        {
+            m_ObjectResetter = GetComponent<ObjectResetter>();
+        }
+
+
+        private IEnumerator OnCollisionEnter(Collision col)
+        {
+            if (enabled)
+            {
+                if (col.contacts.Length > 0)
+                {
+                    // compare relative velocity to collision normal - so we don't explode from a fast but gentle glancing collision
+                    float velocityAlongCollisionNormal =
+                        Vector3.Project(col.relativeVelocity, col.contacts[0].normal).magnitude;
+
+                    if (velocityAlongCollisionNormal > detonationImpactVelocity || m_Exploded)
+                    {
+                        if (!m_Exploded)
+                        {
+                            Instantiate(explosionPrefab, col.contacts[0].point,
+                                        Quaternion.LookRotation(col.contacts[0].normal));
+                            m_Exploded = true;
+
+                            SendMessage("Immobilize");
+
+                            if (reset)
+                            {
+                                m_ObjectResetter.DelayedReset(resetTimeDelay);
+                            }
+                        }
+                    }
+                }
+            }
+
+            yield return null;
+        }
+
+
+        public void Reset()
+        {
+            m_Exploded = false;
+        }
+    }
+}