可跟踪信息是设备能够在物理环境中跟踪的特征，比如平面。
TrackableType 可以用作标志并传递给 XRRaycastSubsystem.Raycast 等方法，以指定要进行射线投射的
不同类型的可跟踪信息。
| None | 无可跟踪信息。 |
| PlaneWithinPolygon | BoundedPlane 的边界 |
| PlaneWithinBounds | 在 BoundedPlane 的 BoundedPlane.Size 范围内 |
| PlaneWithinInfinity | BoundedPlane 的无限平面 |
| PlaneEstimated | 一个估算平面。 |
| Planes | 任何平面类型。 |
| FeaturePoint | 功能点 |
| All | 所有可跟踪信息（平面和点云） |
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