Collision detection not working in Unity 2D

Question

I have two 2D game objects. They each have a Box Collider 2D and a Rigid Body 2D which is not kinematic. When the game plays, one moves towards the other and collides with it. However, I also have the following method in the moving GameObject: ``` void OnCollisionEnter(Collision collision) { print( "Collided with someone" ); } ``` The print statement never prints, so presumably the method is never called. Where am I going wrong?

Accepted Answer

Unity has replicated all of the physics methods for 2D with the word "2D" stuck onto the end! So for your example, it should be changed to:

```
void OnCollisionEnter2D(Collision2D collision)
```

And the same with basically any other 2D physics thing.

Collision detection not working in Unity 2D

Solution

Problem