The following examples demonstrate ways to call events from collision functions. They use OnCollisionEnter
and OnTriggerEnter
respectively, but the concepts apply to all OnCollision
and OnTrigger
functions.
You can configure your scripts to trigger different events based on the properties of the other collider’s associated GameObject, such as its name or tag. This is useful if, for example, you want to allow some colliders to produce an event, but not others.
The following example prints a different message depending on whether the other collider that has touched this collider has a tag of “Player” or “Enemy”.
using UnityEngine;
using System.Collections;
public class DoorObject : Monobehaviour
{
private void OnCollisionEnter(Collider other)
{
if (other.CompareTag("Player"))
{
Debug.Log ("The player character has touched the door.")
}
if (other.CompareTag("Enemy"))
{
Debug.Log ("An enemy character has touched the door!")
}
}
}
The following example uses a trigger collider to produce a hoverpad. The trigger collider is positioned directly on top of a hoverpad GameObject, and applies a constant upward force to any GameObject within its trigger.
using UnityEngine;
using System.Collections;
public class HoverPad : MonoBehaviour
{
// define a value for the upward force calculation
public float hoverForce = 12f;
// whenever another collider is in contact with this trigger collider…
void OnTriggerStay (Collider other)
{
// …add an upward force to the Rigidbody of the other collider.
other.rigidbody.AddForce(Vector3.up * hoverForce, ForceMode.Acceleration)
}
}
Did you find this page useful? Please give it a rating:
Thanks for rating this page!
What kind of problem would you like to report?
Thanks for letting us know! This page has been marked for review based on your feedback.
If you have time, you can provide more information to help us fix the problem faster.
Provide more information
You've told us this page needs code samples. If you'd like to help us further, you could provide a code sample, or tell us about what kind of code sample you'd like to see:
You've told us there are code samples on this page which don't work. If you know how to fix it, or have something better we could use instead, please let us know:
You've told us there is information missing from this page. Please tell us more about what's missing:
You've told us there is incorrect information on this page. If you know what we should change to make it correct, please tell us:
You've told us this page has unclear or confusing information. Please tell us more about what you found unclear or confusing, or let us know how we could make it clearer:
You've told us there is a spelling or grammar error on this page. Please tell us what's wrong:
You've told us this page has a problem. Please tell us more about what's wrong:
Thank you for helping to make the Unity documentation better!
Your feedback has been submitted as a ticket for our documentation team to review.
We are not able to reply to every ticket submitted.