fix(utilities): Fixes problem with check for HMD, now using new Unreal internal function.

Source/RWTHVRToolkit/Private/Utility/RWTHVRUtilities.cpp

 #include "Utility/RWTHVRUtilities.h"
 
 #include "AudioDevice.h"
+#include "HeadMountedDisplayFunctionLibrary.h"
 #include "IHeadMountedDisplay.h"
 #include "IXRTrackingSystem.h"
 #include "Engine/Engine.h"
@@ -18,9 +19,7 @@ bool URWTHVRUtilities::IsDesktopMode() { return !IsRoomMountedMode() && !IsHeadM
 
 bool URWTHVRUtilities::IsHeadMountedMode()
 {
-	// In editor builds: checks for EdEngine->IsVRPreviewActive()
-	// In packaged builds: checks for `-vr` in commandline or bStartInVR in UGeneralProjectSettings
-	return FAudioDevice::CanUseVRAudioDevice();
+	return UHeadMountedDisplayFunctionLibrary::IsHeadMountedDisplayEnabled();
 }
 
 bool URWTHVRUtilities::IsRoomMountedMode()

Source/RWTHVRToolkit/RWTHVRToolkit.Build.cs

@@ -38,7 +38,7 @@ public class RWTHVRToolkit : ModuleRules
 		PrivateDependencyModuleNames.AddRange(
 			new string[]
 			{
-				"NetCore"
+				"NetCore", "XRBase"
 			}
 		);
 		if (Target.bBuildEditor == true)