I am not sure. But first what i try to get is some kind of aiming assistance in my shooter for longrange weapons.

My first aproach was to create a second view with higher layer and smaler size, centered to the screen. It has the same position and rotation as my main view.
But the problem here is that the area covered by the second view is to0 big. It is still the whole screen just scaled down to fit within the size parameters.
I think i will need something like "window" as it is available for panels. I'm sorry i cant describe it better at the moment.

Regards