Being seen

There are many occasions during gameplay when questions of object visibility arise, some actual and some hypothetical. Concerning the actual occasion, there are several questions we could ask, including whether object X is visible to camera Y right now, whether object X is visible to any camera right now, or when does object X become visible or nonvisible to a specific camera or to any camera. With regard to hypotheticals, we would ask whether object X would be visible if camera Y were moved to position Z. In the actual occasion case, we're concerned with the real visibility of objects for the current frame, based on the positions of all cameras, and concerning hypotheticals, we're concerned with what would be the case if a camera were ...

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