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Question by AdamOnUnity · May 29, 2015 at 12:36 PM · unity 52djavascriptcollisionrigidbody2d

Unity2D game objects don't collide

I made two objects and attached a BoxCollider and a RigidBody2D component to each of them.

In the code associated with object 1, I have

     void FixedUpdate(){
         GetComponent<Rigidbody2D> ().AddForce (new Vector2 (1.0f, 9.8f),
                                                   ForceMode2D.Force);
     }
     void OnCollisionEnter(){
         Debug.Log ("Collision");
     }

and in the code associated with object 2, I have,

     void FixedUpdate(){
         GetComponent<Rigidbody2D> ().AddForce (new Vector2 (-1.0f, 9.8f),
                                                    ForceMode2D.Force);
     }


And when I play, the objects move toward each other, seem to physically touch each other, and then rotate away from each other. Nothing is logged, OnCollisionEnter is never entered into?

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avatar image $$anonymous$$ · May 29, 2015 at 12:35 PM 0
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It depends on what object collided with which one, because the "OnCollisiobEneter()" will only occur when OBJECT 1 collides first...

avatar image LaireonGames · May 29, 2015 at 12:58 PM 1
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taxi's answer is right you need to change OnCollisionEnter to be 2D. Also a box collider will not work. You need to add a 2D BoxCollider!

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Answer by taxvi · May 29, 2015 at 12:53 PM

because Rigidbody2D is triggering OnCollisionEnter2D(Collision2D col) instead of OnColisionEnter

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