只有当你的程序修改一个在场景图中隐藏很深或者经由用户交互式而被选择的节点的时候，问题才会比较复杂。
The problem becomes more complex if your application modifies a node that is buried deep within a scene graph or selected interactively by a user.
只有当你的程序修改一个在场景图中隐藏很深或者经由用户交互式而被选择的节点的时候，问题才会比较复杂。
The problem becomes more complex if your application modifies a node that is buried deep within a scene graph or selected interactively by a user.
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