主要有两个问题；
I have two questions now (My English may not be so good,sorry about that)
其一是，如何实现蓝图修改NavModifierVolume中NavArea_Obstacle类的开销（Cost)，以实现比较不同的Obstaclel类的不同的通行性；
The First is ,How to make it possible to modify the “cost” of the NavArea_Obstacle Class in order to set different accessibility for different NavModifierVolume using the NavArea_Obstacle Class
其二是，如何构建对同一区域，针对不同Actor产生不同通行性的导航方法，举个例子，正向车道与逆向车道；
The Second is,How to build a navigation system in the same area that can provide different navigation for different classes of actors.For Example,on the same road we have vehicles moving on both forward lanes and reverse lanes.