Fix fallback to head orientation tracking if eyetracking is unavailable, see #102

Source/StudyFrameworkPlugin/Private/Logging/SFLogObject.cpp

@@ -166,7 +166,7 @@ void USFLogObject::WriteGazeTrackingLogToFile() {
 	}
 
 	USFGazeTracker* GazeTracker = USFGameInstance::Get()->GetGazeTracker();
-	if(!GazeTracker || GazeTracker->DataAlreadyLogged())
+	if(!GazeTracker || (GazeTracker->IsTrackingEyes() && GazeTracker->DataAlreadyLogged()))
 	{
 		return;
 	}

Source/StudyFrameworkPlugin/Public/GazeTracking/SFGazeTracker.h

@@ -86,7 +86,9 @@ private:
 	UPROPERTY()
 	TArray<AActor*> ActorsToIgnore;
 
-	bool bDataLogged = false;
+	//This is only relevant for when eyetracking is used: Set false once SranipalEyeData is updated, Set true after writing out current eyedata
+	//For Head Rotation, we always get up-to-date info while logging, then bDataLogged is ignored
+	bool bDataLogged = true;
 	float EyeDataGatheringDelay;
 	float TimeSinceLastEyeDataGather = 0.0f;
 #ifdef WITH_SRANIPAL