Stopping OnCollisionEnter from occurring too often

Whats the best way to stop an OnCollision even from occurring too often .

Its a breakout like game, and I run the Alt() function every time the ball hits the paddle , right now i just jumps to 2 and then the game object destroys itself .

Code (csharp):

1.  
2.     void OnCollisionEnter ()
3.     {
4.    
5.     Alt();  
6.    
7.    
8.     }
9.    
10.    
11.     void Alt() {
12.     ;
13.         if( i == 0 ) {
14.         Me.fillColor1 = ColorNew ;  
15.             Me.RefreshMesh();
16.     i ++ ;
17.         }
18.         if( i ==1 )
19.         {
20.             Me.fillColor1 = ColorB ;
21.         i++;   
22.         Me.RefreshMesh();
23.         }
24.        
25.         if(i== 2 ) {
26.            
27.         Destroy(gameObject);
28.        
29.         }
30.        
31.     }
32.  

I could do this with Couritines , but I'd like to know if their was a clearer way of doing this .

 

I think it's because the ball hasn't moved out of the collision box by the time it gets called again. I solved this problem by seting a timer to say 1/10 th of a second after the 1st hit and just returning from your collision routine if the time hasn't passed yet.

Another way is to set a flag on entry and clear the flag on collision exit, so don't process the collision if the flag is still set.