| point | 场景中焦点相对于摄像机的位置。 |
| normal | 在焦点处查看的平面的表面法线。 |
| velocity | 描述焦点在这个时间点如何在场景中移动的矢量。这允许设备补偿头部移动和场景中对象的移动。 |
针对此帧，在 3D 空间中将一个点设置为场景的焦点。这有助于提高此点周围内容的视觉保真度。必须每一帧都设置此值。
请注意，指定将焦点中的内容锁定到身体，系统将以未锁定到身体的内容为代价，提高锁定到身体的内容的保真度。这在用户移动时尤其明显。
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