Draw

    var depth = 10.0;
    var pencil : Transform;

    function Start ()
    {
         Cursor.visible = true;
    }

    function Update ()
    {

         var mousePos = Input.mousePosition;
         var wantedPos = Camera.main.ScreenToWorldPoint (Vector3 (mousePos.x, mousePos.y, depth));
         transform.position = wantedPos;

    }
    function FixedUpdate(){
    if(Input.GetMouseButtonDown(0)){

    Instantiate(pencil, transform.position, transform.rotation);

    }
    }