IntPtr Windows::Perception::Spatial::ISpatialCoordinateSystem 的指针。
返回 Windows::Perception::Spatial::ISpatialCoordinateSystem 原生指针，此指针是从 Unity 世界原点下的 Windows::Perception::Spatial::ISpatialStationaryFrameOfReference 对象检索到的。
调用程序使用此引用执行完操作后，会负责将其释放。如果没有可用的 ISpatialCoordinateSystem，此函数可能会返回 null。
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