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scrolling an openGL view (with an NSScrollView)

I think I've found a solution here, I just want to check that I am barking
up the right tree.

I am attemptying to scroll an NSOpenGLView (subclass of), the total area of
which is greater than 2048x2048. My first solution (as explained here) was
to change the viewport as I scrolled, however this limited me to 2048x2048,
so I have thought up a slightly different solution.

First I create an NSScrollView which contains a dummy NSView (which does no
rendering at all), I then put an OpenGL view over the top of the scroll view
(so that only the scroll bars show). In the OpenGL view I translate before
drawing (using glTranslate (xPan, yPan, 0.0)) and according to how much my
view is zoomed and translated I change the frame rect of the dummy NSView
behind the openGL view.

Is this a sensible approach, or is there a simpler solution?

Bob
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