Been looking for the trick to make a window in boom that is a solid sector that blocks sound and lets the player look through transparent textures on the upper/lower sidedef. It might be a vanilla trick too, as I remember playing an old wad that had a gate made in this way that raised immediately when opened. There was also a map a guy made pretty recently in wads/mods that had this for a grate that opened when you get a key. If anyone could explain how this works/what I'm doing wrong (map is #2