var prefab: GameObject;
function Update () {
	if(Input.GetButtonDown("Fire1")){
		var ray : Ray = Camera.main.ScreenPointToRay (Input.mousePosition);
		var hit :RaycastHit;
		if (Physics.Raycast (ray, hit, 100)){
			hit.point.z=0.0;
			var dir:Vector3=(hit.point-transform.position).normalized;
			Debug.Log(hit.point);
			var projectile = Instantiate(prefab, transform.position+dir, Quaternion.identity);
			projectile.rigidbody.velocity=20*dir;
		}
	}
}