While there?s little-to-no chance we?ll ever actually play that canceled Portal prequel, some details recently surfaced about the mysterious project and its secret F-Stop mechanic. It?s no secret that Portal 2 was actually the backup plan for Valve. Originally the game was a prequel and ran off a mechanic called ?F-Stop?, which testers loved but was ultimately cut from the game because most people kept asking where Chell, GLaDOS, and the actual portals were. Valve has never actually talked about what F-Stop was, mostly because they planned to use it for a future game. Now, we finally get a chance to see. Valve has provided the code for F-Stop to indie developer LunchHouse Software so they can make a documentary named Exposure, a ?multi-part video series detailing the original mechanics of Valve?s F-Stop.? The mechanic centers around a camera called the Aperture Camera. The player takes pictures of objects in the world, saving them as photos that you would hold. Players then place the object in the world, changing its dimensions to any size. In the brief minute and a half video, we got to see the player resize various crates to climb on, mess with the physics by attaching balloons to a crate so it lifts off, and eventually move a fan to the ground to use it as a launchpad.

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