XRTrackableFeature
This OpenXRInteractionFeature configures new extension XR_ANDROID_trackables at runtime and provides XRPlaneSubsystem implementation that works on Android XR platform. 
Note: due to the dependency on XRSessionFeature, its priority must be lower than session feature so the feature registration happens after XrInstanceManager creation.
Summary
Inheritance
Inherits from:OpenXRFeature
        Public attributes | 
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        ExtensionString = "XR_ANDROID_trackables"
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        const string
        The OpenXR Extension string.  
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        FeatureId = "com.google.xr.extensions.trackables"
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        const string
        The feature ID string.  
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        UiName = "Android XR (Extensions): Plane"
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        const string
        The UI name shows on the XR Plug-in Management panel, help users to understand validation errors and expected fixes.  
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        Public static attributes | 
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        IsExtensionEnabled => _extensionEnabled
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        bool
        Gets if the required OpenXR extension is enabled.  
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        RequiredPermission =
            AndroidXRPermission.SceneUnderstandingCoarse
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        readonly AndroidXRPermission
        Runtime permission required to enable scene understanding.  
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Public attributes
ExtensionString
const string ExtensionString = "XR_ANDROID_trackables"
The OpenXR Extension string.
Used to check if this extensions is available or enabled.
FeatureId
const string FeatureId = "com.google.xr.extensions.trackables"
The feature ID string.
UiName
const string UiName = "Android XR (Extensions): Plane"
The UI name shows on the XR Plug-in Management panel, help users to understand validation errors and expected fixes.
Public static attributes
IsExtensionEnabled
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 extension is available on current device. 
RequiredPermission
readonly AndroidXRPermission RequiredPermission = AndroidXRPermission.SceneUnderstandingCoarse
Runtime permission required to enable scene understanding.