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So [this link](http://www.unity3dstudent.com/2010/07/beginner-b01-basic-collision-detection/) was of no use, despite the handy “code used” segment which showed exactly how collisions are detected?
Or [this link](http://docs.unity3d.com/Documentation/ScriptReference/Collider.OnCollisionEnter.html) which is the documentation and indicates that collisions are handled via a function?
Or the half dozen or so other links that show the same thing?
(GIANT HINT: There is no “if(colliding)” check)