XRFaceTrackingFeature
This OpenXRInteractionFeature configures new extension 
XR_ANDROID_face_tracking and provides face blendshape parameter vectors at runtime. 
Summary
Inheritance
Inherits from:OpenXRFeature
        Public attributes | 
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        FaceTrackingExtensionString = "XR_ANDROID_face_tracking"
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        const string
        The OpenXR Extension string.  
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        FeatureId = "com.google.xr.extensions.face_tracking"
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        const string
        The feature ID string.  
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        UiName = "Android XR: Face Tracking"
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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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        IsFaceTrackingExtensionEnabled => _faceTrackingExtensionEnabled
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        bool
        Gets if the required OpenXR extension is enabled.  
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        RequiredPermission =
            AndroidXRPermission.FaceTracking
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        readonly AndroidXRPermission
        Runtime permission required to enable face tracking.  
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Public attributes
FaceTrackingExtensionString
const string FaceTrackingExtensionString = "XR_ANDROID_face_tracking"
The OpenXR Extension string.
Used to check if this extensions is available or enabled.
FeatureId
const string FeatureId = "com.google.xr.extensions.face_tracking"
The feature ID string.
UiName
const string UiName = "Android XR: Face Tracking"
The UI name shows on the XR Plug-in Management panel, help users to understand validation errors and expected fixes.
Public static attributes
IsFaceTrackingExtensionEnabled
bool IsFaceTrackingExtensionEnabled => _faceTrackingExtensionEnabled
Gets if the required OpenXR extension is enabled.
When OpenXR runtime is waiting, it returns null. Otherwise, it indicates whether the XR_ANDROID_face_tracking extension is enabled. 
RequiredPermission
readonly AndroidXRPermission RequiredPermission = AndroidXRPermission.FaceTracking
Runtime permission required to enable face tracking.