# TrackingReference

> XRInputSubsystem tracks all InputDevice s in reference to an InputDevice with the InputDeviceCharacteristics.TrackingReference flag set when set to TrackingOriginModeFlags.TrackingReference.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine.XR](/engine/6000.6/script-reference/unityengine/xr.md)
* **Assembly:** UnityEngine.XRModule

```csharp
TrackingReference = 4
```