...Copy the Plugin in your (you might need to create a Plugin folder in the directory where your project file is). Start (or restart) Unreal Engine. You might get a warning that the plugin needs to be rebuilt. That's normal. Drag the OffAxisActor in your scene. Set position of OffAxisActor to 0,0,0. In the OffAxisActor, place the child actors P_a, P_b, and P_c so that they correspond to the corners of your "virtual window". For some inputs, you might need to change the key if they are already in use in your project.