All the info I can find are for old versions of the engine. What is the best way to do this now? Do I use nDisplay?
Unreal by default has 1 camera and 1 window so that’s half the problem. Next thing you need to spawn second windows, you can do that with UGameEngine::CreateGameWindow(). Then you spawn an image there and stream your camera into the image. The easiest way would be to create scene capture and bind render target and image. You’ll probably need slate to do that.