Generated Terrain not colliding! HALP.

Hi all, I'm sort of new to this and I'm still learning. But I have this little game where you have an infinite scrolling hilly terrain (I borrowed the scripts from another project) but I want the camera to collide with this generated terrain so I can know when to end the game. I put a plain sphere as a child of the main camera with a sphere collider on it. The terrain has a mesh collider on it and I modified the script so that it tags each instantiated plane with "Plane". The camera doesnt stop moving so I made a script but that isnt working either...am I doing something wrong?

     function OnCollisionEnter(other : Collision) {
     Debug.Log(other.transform.tag);
     if (other.transform.tag == "Plane"){
     stopIt();}
     else{
     Debug.Log("you hit SOMETHING");
     }
     }
     
     function stopIt(){
     Time.timeScale = 0;
     //code to end game or whatever goes here
     }

the following code doesnt even generate ANY output in the console... Please help if you can! Any assistance is greatly appreciated! Thanks.