表示设备如何报告姿势数据。
| Device | 表示设备相对跟踪原点。设备相对跟踪原点定义了在某个先前时间点（通常在重新居中事件、开机或 AR/VR 会话开始时）位于空间内设备位置的本地原点。设备提供的姿势数据将在此空间中相对于本地原点。这意味着在此模式下返回的姿势将不包括用户高度（对于 VR）或设备高度（对于 AR），并需要相应地手动偏移 XR 设备的摄像机跟踪位置。 |
| Floor | 表示跟踪原点，其中 0,0,0 位于“地板”上或由正在使用的 XR 设备确定的其他表面上。XR 设备在此模式下报告的姿势值将包括 XR 设备在此表面上方的高度，无需将摄像机跟踪 XR 设备的位置偏移位于地板上方的用户高度 (VR) 或设备高度 (AR)。 |
| Unknown | 这表示设备不知道或无法确定其当前报告姿势数据的方式。应将此值视为错误条件。 |
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