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GL viewports

What's a good way to get OpenGL to render just a bit of the display?

What I need is a 3D view and a bit of 2D UI. So I figured I can set
the viewport up to draw the 3D view most of the time and just rewire
it to draw the 2D UI when that changes.

Is that sensible?

Do the 2D operations get clipped by the viewport? (I'm assuming they
will, because that would be the sensible thing.)

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