Anyway, once the lights turn off, you are in a different and similar room. There was one in chapter 4 when you escape from Glados light bridge experiment. That does make sense in The Part Where He Kills You, but they had to put that in because the room was moving. This might show the trick better than above pictures. From here on he shows the box from outside at the three locations (before box, in box, after box) he first does this slowly, then at a later point he goes between all of them in quicker succession. You might want to skip the commentary and long walk and go to 04:30. Near the threshold and a tiny step (noclip fly) to either side: Here is a picture of the Death Trap that isn't connected to the other rooms: I guess that the development team first made the rooms separate so that they could wipe a bad room, then connect them later when the levels were more perfect, and I suppose that this room didn't fit.
It is the only use of this entity in the final version of the game, though commentary states that it was used a lot during the development of the title to link chambers together. The room is actually completely separate from its supposed surroundings. It is used in Chapter 9, in the Chamber 75 Death Trap with all the crap turrets. This entity is designed to link two separate, distant areas together without any clear transition between the two. In the entity list, there is a linked_portal_door for this purpose it is used in the Death Trap (in map sp_a4_finale2.bsp): See if you can figure out where it is.Īfter the map layout was finalized, most of these were fixed into boring linear spaces, likely for the sake of performance, save for one spot. There's only one impossible space left in the whole game. Once the game settled down we were able to finalize our path and remove all of the world portals. Even a simple door worked like the cartoons - just a facade painted on a wall that seamlessly opened somewhere else entirely. Soon every connection between any space was a portal. If we ever wanted to ship something the size of Portal with the finely tuned balance we desired then we needed a way to be able to make big changes to the layout of the game without paying the cost of making everything line up again.
When we started the project, making any big structural change in a level or the order of levels would lead to hours or even days of busy work trying to reconnect things and make sure they lined up again. One of the commentary nodes by a Portal 2 developer, Eric Tams, said they used "world portals" to quickly reconfigure maps and puzzles during testing, which allowed them to create rooms that were bigger on the inside, infinite falls, and other sorts of impossible geometry, save for the users own ASHPD space bending.
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