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The computer is voiced by Ellen McLain, who also voiced GLaDOS, the A.I. from Portal (2007) and Portal 2 (2011). This is in fact a cameo by GLaDOS, as Guillermo del Toro was such a fan of the games that he approached the game's developers, Valve, who approved. Del Toro said in an interview for the Toronto Sun, "I wanted very much to have her, because I'm a big Portal fan. But just as a wink. She's not cake-obsessed. She's not out to destroy humanity." He further explained, "Look, there's no A.I. I'd rather have than GlaDOS, but McLain's voice in the movie, due in theaters July 12th, has been modulated a bit to be less similar to the distinctive tone of Portal's unforgettable antagonist. The filter we're using is slightly less GLaDOS. Slightly. The one in the trailer I wanted to be full-on GlaDOS." The GLaDOS voice itself is inspired by the computer in The Thirteenth Floor (1999).
Approximately a hundred Kaijus and a hundred Jaegers were designed, but only a fraction of them appeared in the film. Every week, the filmmakers held a vote for their favorites.
(At around 1 hour, 25 minutes) The inside of the building that Gipsy's fist smashes through was created using miniatures. Many of the components of the office cubicles were made using 3-D printers. The lighting was practical and done to scale. Once the set was ready, a large green mandrel was rammed through it. This was digitally replaced with Gipsy's fist.
According to Travis Beacham, in an earlier version of the script Mako and Raleigh spoke two different languages for a majority of the film. After connecting as pilots, they slowly began to understand one another, and before the end they heard each other speaking in their own respective languages. The only remnant of a language barrier is when Raleigh speaks to Mako in Japanese, and she is surprised he knows her home language.
Though the giant monsters were always intended to be computer generated, all of their designs were expanded from the notion that they could be "worn as suits," like in traditional kaiju films.
Screenwriter Travis Beacham also wrote the graphic novel Pacific Rim: Tales from Year Zero. Released along with the movie, "Tales from Year Zero" serves as a prologue to the film and is set twelve years before its events.