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)。
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