"NOTE: if your project is a pure Blueprint project, you may need to add a dummy C++ game module to your project to get Unreal to generate a Visual Studio project for you. " This sentence is from GitHub - OSVR/OSVR-Unreal: OSVR plugin for Unreal Engine. Showdown VR Demo is a pure blueprint. In UE4.13 “add an empty class in the editor” can be interpreted as “add a dummy C++ game module”, is it true? Thank you.