I suspect that this is a pretty basic question, but I've not found the right
search terms yet.  I'd like to know how to do the following:  imagine you're in
a stadium, and there's one of those jumbo-tron screens that shows people in the
audience.  If I were to take a picture of that stadium, then that picture would
contain the people in the stadium, plus that jumbo-tron screen, which shows the
perspective of another camera, projected onto a rectangle.  I'd like to know how
to replicate this behavior (having a rectangle somewhere in my scene whose
texture is the projection of some other part of the scene).  Is there an easy
way to do this?

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