# Unbounded

> XRInputSubsystem tracks all InputDevice s in relation to a world anchor. This world anchor can change at any time, and is chosen by the runtime.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine.XR](/engine/6000.7/script-reference/unityengine/xr.md)
* **Assembly:** UnityEngine.XRModule

```csharp
Unbounded = 8
```

### Remarks

Use [\_trackingOriginUpdated](/engine/6000.7/script-reference/unityengine/xr/xrinputsubsystem/trackingoriginupdated.md) to be notified when the anchor has been updated.