I'm doing some research on virtual visual environments. I believe that the PVS contains the estimated set of objects (geometry) that may be visible to the player. I was wondering if there was an Actual Visible Set that contains only the objects that the player really can see. If there isn't, would it be difficult to create such a set? Hopefully, I wouldn't have to do any ray-tracing or anything. Also, is there a short way of getting the number of objects visible on the screen? I think I've seen this before in some area portal tutorial where the guy had objects shown as wire meshes.
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