# XRObjectTrackingFeature

This `OpenXRInteractionFeature` configures Android XR extensions `XR_ANDROID_trackables` and `XR_ANDROID_trackables_object` at runtime and provides XRObjectTrackingSubsystem implementation that works on Android XR platform.

Note: due to the dependency on [XRSessionFeature](https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRSessionFeature#classGoogle_1_1XR_1_1Extensions_1_1XRSessionFeature), its priority must be lower than it so the feature registration happens after XrInstanceManager creation.

## Summary

### Inheritance

Inherits from: `OpenXRFeature`, [`Google.XR.Extensions.IXRSpatialSdk`](https://developer.android.com/develop/xr/unity/reference/interface/Google/XR/Extensions/IXRSpatialSdk)

| ### Public attributes ||
|---|---|
| `https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRObjectTrackingFeature#extensionstrings = "XR_ANDROID_trackables " + "XR_ANDROID_trackables_object"` | `const string` The OpenXR Extension string. |
| `https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRObjectTrackingFeature#featureid = "com.google.xr.extensions.object_tracking"` | `const string` The feature ID string. |
| `https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRObjectTrackingFeature#uiname = "Android XR (Extensions): Object Tracking"` | `const string` The UI name shows on the XR Plug-in Management panel, help users to understand validation errors and expected fixes. |

| ### Public static attributes ||
|---|---|
| `https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRObjectTrackingFeature#isextensionenabled => _extensionEnabled` | `bool` Gets if the required OpenXR extension is enabled. |
| `https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRObjectTrackingFeature#requiredpermission = AndroidXRPermission.SceneUnderstandingCoarse` | `readonly https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#androidxrpermission` Runtime permission required to enable scene understanding. |

| ### Public functions ||
|---|---|
| `https://developer.android.com/develop/xr/unity/reference/class/Google/XR/Extensions/XRObjectTrackingFeature#gettargetversion()` | `https://developer.android.com/develop/xr/unity/reference/namespace/Google/XR/Extensions#xrspatialsdkversions` Gets the target version of the given feature if applicable. |

## Public attributes

### ExtensionStrings

```c#
const string ExtensionStrings =
            "XR_ANDROID_trackables " +
            "XR_ANDROID_trackables_object"
```
The OpenXR Extension string.

Used to check if this extensions is available or enabled. To enable runtime configuration, always enabling persistence extension when it's available.

### FeatureId

```c#
const string FeatureId = "com.google.xr.extensions.object_tracking"
```
The feature ID string.

### UiName

```c#
const string UiName = "Android XR (Extensions): Object Tracking"
```
The UI name shows on the XR Plug-in Management panel, help users to understand validation errors and expected fixes.

## Public static attributes

### IsExtensionEnabled

```c#
bool IsExtensionEnabled => _extensionEnabled
```
Gets if the required OpenXR extension is enabled.

When OpenXR runtime is waiting, it returns `null`. Otherwise, it indicates whether the `XR_ANDROID_trackables` and `XR_ANDROID_trackables_object` extensions are available on current device.

### RequiredPermission

```c#
readonly AndroidXRPermission RequiredPermission =
            AndroidXRPermission.SceneUnderstandingCoarse
```
Runtime permission required to enable scene understanding.

## Public functions

### GetTargetVersion

```c#
XRSpatialSdkVersions GetTargetVersion()
```
Gets the target version of the given feature if applicable.