I thought there had been some discussion about this, Way Back When (TM), but I
could not locate a thread.

I was wondering if there were some way to calculate the positions of the four
corners of the visible render frame, or unit-length-vectors that point from the
camera in those directions.

If there are other formulas for calculating schtuff associated with the final
render and field of view, that would be helpful as well.

Currently just interested in typical perspective camera, though I also use
orthographic frequently.

Thanks

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