Today at the North American International Auto Show in Detroit, Toyota revealed a curvy, candy-apple red sports car called the FT-1. But before this sexy coupe was assembled, it existed in a videogame, tested extensively and designed on the tracks of Gran Turismo 5 and 6.  The Verge reports that Polyphony, the maker of the ultra-realistic auto sim, were involved in the process from the conceptual stages, creating in-game models of the vehicle so that the designers could get a feel for how it would perform before they went about producing it. The designers then used the game to pitch…