anchor.diff:      _transparentMeshes.clear();
     }
   
  -  void enter();
  +  void enter() {
  +    
  +  }
   
  +  // TODO remove parameters
     void enterFrame(num elapsed, num interval) {
   
     }
  
positive.code:       _lights.add(node);
      }
      nodes.add(node);
      if (node.name == null) {
        node.name = "Node${nodes.length}";
      }
    }
  
  
negative.code:       _physicsEngine = null;
        return false;
      }
      if(gravity == null) gravity = _gravity;
      _physicsEngine._initialize(gravity);
      return true;
    }
  