//private void OnCollisionEnter(Collision collision)
//{
// Debug.Log("AlertGameAreaLimit");
// StartCoroutine(AlertGameAreaLimit());
//}
public IEnumerator AlertGameAreaLimit()
{
UICtrl uiCtrl = FindObjectOfType <UICtrl>();
uiCtrl.AlertTextSet("この先はゲームエリア外です");
yield return(new WaitForSeconds(3.0f));
uiCtrl.AlertTextOff();
}