Unity 3D 5.4 2D Collisions Not Working?

Question

I am working on a very small Unity 5.4 project, I have several "pellets" which in the game world have a Rigid Body 2D and 2D polygon collider attached. I then also have a ball which has a Rigid Body 2D, Polygon Colider and also a Physics Material which allows the ball to bounce into other objects.

The following code is attached to a script on the ball would do something... anything when it hits the green pellets but nothing happens. I don't actually want it to quit the application this was just for example purposes.

The following are the properties of both objects:

public class BallBounce : MonoBehaviour {

    // Use this for initialization
    void Start () {
        //activate camera because I am lazy
        var cam = GameObject.Find ("camera");
        var ball = GameObject.Find ("ball");
        Rigidbody2D rb = GetComponent<Rigidbody2D>();
        cam.SetActive (true);
                    }

    // Update is called once per frame
    void Update () {
            }

    void OnCollisionEnter2D(Collision2D col)
    {
        if (col.gameObject.tag  ==  "Bricks") {
            Application.Quit ();
        }

    }
}

Answer 1

Application.Quit(); does not work in the Editor. It is used for Standalone Build. Replace that with UnityEditor.EditorApplication.isPlaying = false;

Now, if you want it to work in both Editor and Standalone Build:

void Start () 
{
    //activate camera because I am lazy
    var cam = GameObject.Find ("camera");
    var ball = GameObject.Find ("ball");
    Rigidbody2D rb = GetComponent<Rigidbody2D>();
    cam.SetActive (true);
    Debug.Log("Start Called!");
}

void Update () 
{

}

void OnCollisionEnter2D(Collision2D col)
{
    Debug.Log("Collision detected: "+col.gameObject.name);
    if (col.gameObject.tag  ==  "Bricks") {
       #if UNITY_EDITOR
       UnityEditor.EditorApplication.isPlaying = false;
       #else
       Application.Quit();
       #endif
     }
}

Next time when testing if something is true or false, simply use Debug.Log("It works");