包含此平面的 BoundedPlane 的会话唯一标识符。
如果 SubsumedById 不是 TrackableId.InvalidId，那么此 BoundedPlane 已经合并到 BoundedPlane 中，且 TrackableId 由 SubsumedById 指定。例如，当同一表面的两个部分最初被当作单独平面进行检测时，就可能发生这种情况。当探索物理空间时，设备可以确定两个平面实际上代表同一表面。
注意：并不是所有平台都支持这一功能。Unity 提供了可用信息。
另请参阅：BoundedPlane、XRPlaneSubsystem、XRPlaneSubsystem.TryGetPlane
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