Unreal Live Link Face Plugin:如何检测人脸何时离开相机?

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

我正在跟随 Recording Facial Animation from an iPhone X tutorial with Unreal Engine 4 并成功捕捉和呈现我的脸部运动。
但是当我的脸在镜头外时,编辑器中的姿势会卡在最后一帧。
我怎样才能检测到实时动画数据丢失以便播放预先录制的动画?

我想通了。只需在 c++ 中使用 LiveLinkPlugin 源中的 ILiveLinkClient::IsSubjectValid(SubjectName); 方法或将其导出到蓝图:

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;
}