[visionegg] moving aperture

I'm brand new to vision egg, and getting stymied about how to do the following task.

What I want to do is display an image or text in a viewport, but then hide all but a small aperture (e.g., an oval with gaussian edges), and then move the aperture around.

 If anyone has advice or example code to share, I'd be grateful.

Thanks,

jim

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