// Use this for initialization
void Start()
{
refr = Instantiate(prefab, TargetHelper.getPositionIn(GetComponent <Rigidbody> (), 10), Quaternion.identity);
}
// Update is called once per frame
void Update()
{
Destroy(refr);
refr = Instantiate(prefab, TargetHelper.getPositionIn(GetComponent <Rigidbody> (), 10), Quaternion.identity);
}