How can i get the coordinates of the point on an object I click on?

Hi all,

I am new to this so I hope this question hassn't been asked before. I've tried finding it with google but no luck.

So I am trying to set the coordinates of an empty game object (a 'walkToPoint') to which my character has move when he walks.

What I would like to know is how to get the coordinates of the point on the object 'a plane' (and eventually terrain) i click on.

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Solved =)

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This is what I eventually used (for those who have the same question) :

 var camera3rd     : Camera;
 var walkToPoint    : Transform;
 
 function OnMouseDown()
 {
     var hit    : RaycastHit;
     var ray    : Ray = camera3rd.ScreenPointToRay (Input.mousePosition);
     
     // Cast a ray, get its hit coördinates, set it to the walkToPoint
     if(Physics.Raycast(ray.origin, ray.direction, hit)){walkToPoint.transform.position = hit.point;}
     
     
     // Draw a Yellow colored ray
     // Debug.DrawRay (ray.origin, ray.direction * 50, Color.yellow);
 }
 
 
 
 

camera3rd = my 3rd person camera (the camera you are using to look with)

walkToPoint = A point in space my character has to walk to.