public void AddSidewalk (Block block)
 {
   Sidewalk s = new Sidewalk(block);
   s.name = "sidewalk";
   s.material = MaterialManager.Instance.Get("mat_sidewalk");
   _sidewalks.Add(s);
 }
 public void AddSidewalk(Block block)
 {
     Sidewalk s = new Sidewalk(block);
     s.name = "sidewalk";
     s.material = MaterialManager.Instance.Get("mat_sidewalk");
     _sidewalks.Add(s);
 }