struct in UnityEngine.Experimental.XR
切换到手册一个结构，用于描述表示真实世界表面的有界平面。
与无限的 Plane 不同，BoundedPlane 具有大小和更详细的形状。 BoundedPlane 可能随帧发生更改（请参阅 XRPlaneSubsystem.PlaneUpdated）。通常，这 意味着当前对平面的了解已经改变，而不是对实际几何形状。这可能 发生在设备探索物理空间并能够感知更多细节时。
| Alignment | 平面的对齐方式，例如水平或垂直。 |
| Center | 设备空间中平面的中心点。 |
| Height | 平面的当前高度。 |
| Id | 平面的会话唯一标识符。 |
| Normal | 设备空间中平面的法向矢量。 |
| Plane | 返回与此 BoundedPlane 关联的无限 Plane。 |
| Pose | 设备空间中平面的姿势。 |
| Size | 平面的当前大小。 |
| SubsumedById | 包含此平面的 BoundedPlane 的会话唯一标识符。 |
| Width | 平面的当前宽度。 |
| GetCorners | 在设备空间中输出四个点，表示平面的四个角。这些角按顺时针排序。 |
| TryGetBoundary | 尝试检索设备空间中描述当前平面边界的位置列表。 |
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