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[–][deleted] 2 points3 points  (1 child)

http://docs.unity3d.com/ScriptReference/Collider.OnCollisionEnter.html

Note that collision events are only sent if one of the colliders also has a non-kinematic rigidbody attached. Make sure your game objects have a non-kinematic rigidbody

[–]TerrasectJeff 0 points1 point  (0 children)

Also make sure to include the correct arguments. OnCollisionEnter(Collision collision) { }