Yes, game designers regularly take advantage of physically impossible models. Look at this map of the level "5-D Space" from Bungie's Marathon.[1] Like Doom, th

Yes, game designers regularly take advantage of physically impossible models. Look at this map of the level "5-D Space" from Bungie's Marathon.[1] Like Doom, the map is made of 2D sectors, but without the restriction that sectors can't overlap. Bungie took advantage of this to create an impossible space. The crossing solid lines are part of different rooms that can't be seen from the other. Only sectors connected with the light colored two-sided lines are visible. So you could turn left four times but be in a different room than where you started. Overlapping was used in Tomb Raider III[2] to create a UFO that is larger on the inside than it is on the outside. (This had the unfortunate outcome where I was once killed by an enemy that was inside the UFO while I was outside, but the game thought we were in line-of-sight.) The original Tomb Raider games also used a trick to make the environment dynamic. When they needed to show a wall moving, or ceiling collapsing, or a room being filled with water, you'd be instantaneously teleported to a different map. Sneaky camera positioning made sure you never saw the change taking place. Teleporting is a common technique to make a map appear larger or more complex than it really is. One I learned recently is in The Witness[3]. The best example of a game built around physically impossible spaces is Antichamber[4]. You might enter a room, walk around a pillar, and exiti the same door but end up in a different place than where you started. Antichamber uses portal rendering to show areas that are larger on the inside than the outside, similar to the overlapping in "5-D Space". But also I think it has some teleporting. [1] https://www.lhowon.org/level/marathon/30 https://www.lhowon.org/level/marathon/30 [2] https://www.tombraiderforums.com/showthread.php?t=166545 https://www.tombraiderforums.com/showthread.php?t=166545 [3] https://old.reddit.com/r/TheWitness/comments/47pr3h/spoilersmeta_the_existence_of_portal_technology/d0eseww/ https://old.reddit.com/r/TheWitness/comments/47pr3h/spoilers... [4] http://www.antichamber-game.com/ http://www.antichamber-game.com/