Unity 5 OnCollisionEnter() not working

Questions & Answers
1

Hello,

I have searched both these forums and Google for a solution to my issue. It seems to be fairly common for people to have issues with OnCollisionEnter(), so I hate having to repost, but I have not found any of the other solutions to be helpful.

So I have two objects, a “Footman” and a “Wall”. Both have 2D Box Colliders with triggers disabled. Both have RigidBody2D attached, with only the wall having Kinematic checked. The following code is attached to my wall gameobject;

using UnityEngine;
using System.Collections;

public class CollisionDetection : MonoBehaviour {

public int hitPoints;

// Use this for initialization
void Start () 
{
	hitPoints = 100;
}

// Update is called once per frame
void Update ()
{
	if(hitPoints == 0)
	{
		Destroy (this.gameObject);
	}
}

void OnCollisionEnter(Collision col)
{
	Debug.Log ("Collision!");

	if(col.gameObject.tag == "Footman")
	{
		hitPoints =- 50; 
	}
}

}

I see the objects collide with each other, and the “Footman” gets stopped at the wall, but the debug statement never executes. I am either doing something really stupid, or something is broken.

Thanks a lot for any help!

2

Hey there :smiley:
I had that problem too… Its really simple:

void OnCollisionEnter2D () {}

or with the GameObject:

void OnCollisionEnter2D (Collision2D col) {}

Hope I could help you :slight_smile:

-Simple_zomb

3

2D physics? OnCollisionEnter2D is the right method for that, with Collision2D parameter.

4

You’re doing something really stupid…

void OnCollisionEnter2D() {}
5

You just need attach script to the same object, whose need detects the collision.

6

You need to put the Debug.log() inside the if statement and it needs to be OnCollisionEnter2D() !!