3d or 2d object rendered without window

hello , I am trying to move max’s objects like pwindow playing a video or opengl 3d objects through the main window of a patch , using thispatcher or presentation_position, is there a way that I see only the 3d sphere e.g. , and not its background field,? something like if I want to see shape torus flying around ,like donuts,and I move them not by mousing but via osc , so it would be great if I see only the object with a background of.. a sky,this background is the main patch’s b.g., so I’ll have donuts flying in the sunset .(this is not what I’ll do , only for understand :–) ) .
Hope I’ve explained what I mean , sorry for my english ..
Many thanks .
Carlo .