此 WorldAnchor 用于将表面锁定到相对于现实世界中的对象的位置。调用 RequestMeshAsync 以针对表面生成数据时，系统将在 WorldAnchor 中填入相关内容，并通过 SurfaceDataReadyDelegate 返回此 WorldAnchor。
此锚点允许设备在得知现实世界发生变化时将相应表面锁定到相对于现实世界中的对象的位置。对于此坐标系而言，所有生成的网格数据都是局部数据。调用 RequestMeshAsync 时，需要使用 outputAnchor 参数，因为空间映射网格要映射现实世界。
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