设备空间中平面的姿势。
除非对平面位置的了解发生了变化，
否则各帧之间的平面位置通常保持不变。例如，设备的平面
检测算法可以确定与平面相关联的表面
实际上低于最初设想。在这种情况下，位置的 Y 值
可能会改变。但如果平面的尺寸随着表面的探索而变化，
位置可能会保持不变。这不同于
可能会经常改变的 Center。
因此，Pose.position 提供了一个稳定的参考点，您可以使其与其他 GameObject 相关。
同一性旋转意味着平面是水平的，其法向向上
（沿 Y 轴正方向）。BoundedPlane.Width 与它在 X 方向上的大小对应，BoundedPlane.Height 与它在 Z 方向上的大小对应。
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