rFactor

rFactor is a computer racing simulator designed for hardcore simulation racers. rFactor claimed to be the most accurate race simulator of its time. Released in August 2005, it competed with games like NASCAR Racing 2003 Season, Live for Speed, and GTR. The game featured many technical advances in tire modeling, complex aerodynamics and a 15 degrees of freedom physics engine. It also featured multiplayer. rFactor was developed by Image Space Incorporated (ISI), which has been developing simulators since the early 1990s for both commercial and military purposes. The isiMotor2 on which the game is based is a direct successor to the engine used in previous titles developed by ISI, most notably F1 Challenge '99–'02, released through EA Sports. The isiMotor2 engine was also used in many other simulation games, and in rFpro. The game was made without ISI's longtime publishing partner at the time of EA Sports, and featured exclusively custom tracks rather than licensing real ones.