# Unknown

> TrackingOriginModeFlags.Unknown enumerates when the XRInputSubsystem was not able to set its tracking origin or has no tracking.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine.XR](/engine/6000.0/script-reference/unityengine/xr.md)
* **Assembly:** UnityEngine.XRModule

```csharp
Unknown = 0
```