I am wondering how you would deal with a room that has 2 openings and basically a skylight. Obviously the 2 openings (entryways to the room) has to be portaled, but was not sure how to deal with the skylight opening. 1) should that skylight glass indeed be a tied to world? 2)would an area portal be, in the glass or sized slightly larger than the glass in the z direction such that the skylight glass is slightly smaller than the area portal in the Z direction? 3) when and how do we use func_areaportalwindow?