Camera collision detection?

I want to make my camera move at the ball when the camera has a object in between it, or is in a wall and back when there isnt for example ( atleast when between).

How would I go about doing this I have been trying to figure it out XD

I have the balls camera at a angle aiming down at it so I assume I need to use local position to make it move at the angle i want (its faceing ( currently at the ball)

I was also puzzled on how to figure out what the object is that is hit by a ray (new to rays)

 

Easy, you use a Physics.Raycast from the player to the camera. If it hits something, then you subtract 1 unit for measure and place your camera there.

Code (csharp):

1.  
2. var ray : Ray=Ray(target.position, target.position - transform.position);
3. var hit : RaycastHit;
4. if(Physics.Raycast(ray, hit))
5. transform.position=ray.GetPoint(hit.distance-1);
6.  

 

what is the target in target.position ?

I have it like this

Code (csharp):

1.  
2.  
3. var player = GameObject;
4.  
5. function Update () {
6.  
7.     var ray : Ray = Ray(player.Transform.Position, player.Transform.Position - transform.Position);
8.     var hit : RaycastHit;
9.    
10.     if(Physics.Raycast(ray, hit)){
11.         Camera.main.transform.position = ray.GetPoint(hit.distance-1);
12.        
13.     }
14. }

However on line 6 i have problems with the player which will be the ball and the commands to get his position to start the ray and to send it to the camera *script attached to* I tried lots combos of what commands put after the player but doesnt work .....

 

Does anyone know why the

var ray : Ray = Ray(player.Transform.Position, player.Transform.Position - transform.Position);


does not work, errors with red mark on left in editor ?