view in view

[mms]

Hi all,
I would like to program an augmented reality HUD. I added an object, e.g. an arrow, to my world, but I want it to be only visible, if it is in a specific area of my view. My idea is to add this "ar" objects to an other scene and show this scene in a specific area in my view. I tried this with a subwindow, but i couldn't set the view of the subwindow to show the exact same view like the area that is covered by the subwindow. Is there perhaps an other way to solve this issue?

Thanks in advance.