void Update()
{
  // Check for mouse input
  if (Input.GetMouseButton(0))
  {
      Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
       RaycastHit hit;
       // Casts the ray and get the first game object hit
       Physics.Raycast(ray, out hit);
       Debug.Log("This hit at " + hit.point );
  }
}