针对已在当前帧中删除的每个 BoundedPlane 引发。
平面可能会因以下两种原因而删除：\
1. 系统确定该平面不再有效\
2. 系统确定两个平面实际上为同一表面。在这种情况下，一个平面可能会合并到另一个平面中。
系统将针对一个平面引发 PlaneRemoved 事件，并且 PlaneRemovedEventArgs.SubsumedByPlane 中将会包含
合并后的平面。
另请参阅：BoundedPlane、PlaneRemovedEventArgs
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