A pic will most easily explain what I want:
So, the Viewport object could do this, but I believe it doesn't work in DirectX mode (when I tried it, it just zoomed in on a single-pixel). Is there some other way to do this? Or could someone who understands shader language please help me modify the Lens effect to achieve this? I don't care much about performance, as I'll probably just be using this for debugging, to better see collisions and so on. (then again, now that I think of it, I can think of some cool other uses for it)