Live Link Face: How to detect when the face is out of the camera?

Development Pipeline & Plugins
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1

I’m following the Recording Facial Animation from an iPhone X tutorial capturing and presenting my face movement successfully.
But when my face is out of the camera, the pose in the editor will stuck in the last frame. How could I detect the lost of live animation data so to play a prerecorded animation?

Thanks in advance!

2

I have figured it out. Just use ILiveLinkClient::IsSubjectValid(SubjectName); method from the LiveLinkPlugin source in c++ or export it to Blueprint:

    class DAZTOUE4_API UMyBlueprintFunctionLibrary : 
    public UBlueprintFunctionLibrary
    {
	    GENERATED_BODY()
	
        UFUNCTION(BlueprintCallable, Category = "MyVirtualCharacter")
        static bool IsLiveLinkSubjectValid(const FLiveLinkSubjectName SubjectName);
    };

    bool UMyBlueprintFunctionLibrary::IsLiveLinkSubjectValid(const FLiveLinkSubjectName SubjectName)
    {
        IModularFeatures& ModularFeatures = IModularFeatures::Get();
	    if (ModularFeatures.IsModularFeatureAvailable(ILiveLinkClient::ModularFeatureName))
	    {
    		ILiveLinkClient& LiveLinkClient = ModularFeatures.GetModularFeature<ILiveLinkClient>(ILiveLinkClient::ModularFeatureName);
		    return LiveLinkClient.IsSubjectValid(SubjectName);
    	}
	    return false;
    }