Legacy Documentation: Version 5.4
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MonoBehaviour.OnCollisionEnter(Collision)

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Parameters

other The Collision data associated with this collision.

Description

OnCollisionEnter is called when this collider/rigidbody has begun touching another rigidbody/collider.

In contrast to OnTriggerEnter, OnCollisionEnter is passed the Collision class and not a Collider. The Collision class contains information about contact points, impact velocity etc. If you don't use collisionInfo in the function, leave out the collisionInfo parameter as this avoids unneccessary calculations. Notes: Collision events are only sent if one of the colliders also has a non-kinematic rigidbody attached. Collision events will be sent to disabled MonoBehaviours, to allow enabling Behaviours in response to collisions.

#pragma strict
var audio: AudioSource;
function Start() {
	audio = GetComponent.<AudioSource>();
}
function OnCollisionEnter(collision: Collision) {
	for (var contact: ContactPoint in collision.contacts) {
		Debug.DrawRay(contact.point, contact.normal, Color.white);
	}
	if (collision.relativeVelocity.magnitude > 2)
		audio.Play();
}
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { AudioSource audio; void Start() { audio = GetComponent<AudioSource>(); } void OnCollisionEnter(Collision collision) { foreach (ContactPoint contact in collision.contacts) { Debug.DrawRay(contact.point, contact.normal, Color.white); } if (collision.relativeVelocity.magnitude > 2) audio.Play(); } }

OnCollisionEnter can be a co-routine, simply use the yield statement in the function.