The most flexible approach would be to use a Camera that moves over
the 2D subgraph using the view frustum to clip out what you don't need
to see on screen. The Camera could be a straight HUD camera and
render on top or a RTT Camera, the later would have the added
flexibility of rendering onto 3D objects, but this is really an
orthogonal issue, once you have a Camera for rendering you scrollable
view you are done. For the scrolling you could either update the view
matrix or the projection matrix, personally I'd update the view matrix
as one can then think of scolling as panning across a scene and even
use camera manipulators for it
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