The rFactor mod development tool pack is a set of applications for the video game called rFactor, and this package includes the gMotor MAS File Utility software. The rFactor development tool pack can modify certain files used in the rFactor application, which is a racing simulation video game. The gMotor MAS File Utility program can specifically be used to open files in the .mas extension, and these MAS files are used in the rFactor video game as containers of asset files comprising certain racing track maps. These MAS files also contain other files that are used during gameplay to display visual elements of the rFactor video game, such as backgrounds, foreground items and track structures. Modifications to the asset files contained in these MAS files can be done using the gMotor MAS File Utility software.
Image Space rFactor is a race simulation game that has hyper-realistic graphics and sound FX that surround the senses. The game's second installment has been updated with real-time day and night transitions, improved daylight and nighttime scenes, realistic weather with heat waves and rain, more definition in the road surface while driving, and high-level aerodynamics. The cars received engine boosts, turbo modeling features, new tire models, and cockpit vibrations. This simulation software has been upgraded to work well with multi-core technology for faster game play. The rFactor series featured mixed class road racing in its first installment. Image Space Incorporated developed rFactor using its isiMotor software engine, which made use of an advanced physics engine (pMotor) and an automotive design engine (gMotor) during development. The software engine and its add-on components largely contributed to making rFactor the industry standard in simulated racing platforms.