Talk:Monsters attacking across tall ledges

This bug falls within the no-vertical limit feature (like the barrels that cause damage on a vertical scale). Strictly speaking, Doom is a 2-D game with a 3-D appearance; a similar effect is drawing a 3-D cube on a 2-D piece of paper. Therefore, vertical linedefs are only for show. Although, I'm still a bit concerned about the player's aiming feature. If you fire a rocket at a wall with a monster high on a ledge directly above, why doesn't that monster become afftected?