可选：此字段包含对 PoseProvider 实例的引用，如果设置了该实例，则会用于重载 TrackedPoseDriver 的行为。当此字段为空时，TrackedPoseDriver 将按常规运行，从设备检索姿势数据或检索 TrackedPoseDriver 的姿势设置。设置此字段后，姿势数据将由附加的 PoseProvider 提供。设备或姿势字段将被隐藏，因为它们不再用于控制父游戏对象变换组件。
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