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''iRacing.com'' is an online, subscription-based motor racing simulation service for Microsoft Windows, Linux and OS X created by iRacing.com Motorsport Simulations. In addition to accurately modeled vehicles and tracks, iRacing provides servers on which to race, to practice & to upgrade licenses, and a sanctioning body to organize and oversee competition within the service. From the start, iRacing has been marketed as both an entertainment service and a training tool for real life racers. They have established numerous partnerships with real-world racing organizations and series, including NASCAR, IndyCar, V8 Supercars, the SCCA, the Skip Barber Racing School, the Volkswagen Jetta TDI Cup, the Star Mazda Championship, the Blancpain Endurance Series and Williams F1 among others.〔(【引用サイトリンク】title = Partners )〕 The service was launched to the public on August 26, 2008. There were over 50,000 active members as of December 2013, and over 55,000 by late May 2015. ==Gameplay== The iRacing company aims to cater both to real-world racers and racing simulation enthusiasts〔(【引用サイトリンク】title = iRacing.com FAQ )〕 by offering a realistic simulation of motorsport with accurate track, vehicle and physics modeling,〔(【引用サイトリンク】title = Track Technology )〕〔(【引用サイトリンク】title = Car Technology )〕 and with all of the cars and tracks officially licensed.〔 iRacing can only be driven online on servers run by iRacing.com, and participation requires a subscription to the service. The subscription package includes a basic set of 10 tracks and seven cars with which to practice and race.〔(【引用サイトリンク】title = Membership )〕 Additional cars and tracks are subject to additional one-time charges. Vehicles in iRacing are divided into classes which correspond to the identically named driver license classes, except for the two different Rookie car classes which can both be driven with the same Rookie driver license. The simulator is launched through a member website, and there is no standalone offline client. In addition to choosing the series and session to run, the member site interface can be used to browse series and driver statistics, acquire information about the cars and tracks, keep track of friends & join them in their session, launch the online forums and chat, open the replay viewer, customize the virtual vehicles and helmets, purchase new content, and review and update personal account data. Third-party software also provides additional features; for example "Trading Paints", which hosts custom paint schemes much more detailed and advanced than the customisations available on the website. Another is "LiveRaceStats", which allows users to have a signature bar displaying their iRacing game statistics. Rather than objecting to these external sites, iRacing actively supports their use by the community. An API is provided for third party extensions such as fuel managers, shift lights, live timing and telemetry, however direct modification of core game files is forbidden. iRacing run several different official series, but members are also free to organize their own online sessions that are hosted on servers run by iRacing. In 2012, iRacing increased the ability for users to run their own seasons through the introduction of the "Leagues" feature where, for a fee of $10 a year, users could manage their own league, recruit/accept drivers, and have automated scoring. Individual hosted sessions cost $0.50 per hour to host. Any member-organized sessions are free from the license level restrictions. In addition to taking part in the different public sessions, a member can use a test mode to drive alone on any track with any car, assuming he has purchased the license to use the content. For the standard official series managed by iRacing, each calendar year is normally divided into four 12-week seasons, with all driving sessions in a series taking place on one track for each week during the 12 week seasons. Drivers can participate in practice, qualifying, license time trials, and race sessions. The week between each season is referred to as "week thirteen", and has its own set of series which change track each day. During Week 13 drivers cannot complete time-trials, and so cannot add to their licence level. There are also non-standard series, examples of which are the four-week Rookie series, IndyCar, Skip Barber and Grand-Am Premier series, and Pro series. Races that are organized by members do not have to follow any official schedule. The series are divided into two main categories, oval and road, which are further divided into several license level series from Rookie to Pro, and a driver must earn each license to be eligible to participate in official race week sessions at their license level. If not qualified for the correct license for a series, drivers can still participate in practice sessions. Earning a higher license involves both participation in competitions on a driver's current highest license level and achievement of a minimum safety record. The requirements for advancing and the licenses themselves are category-specific — in other words, a driver has a separate license for road and oval categories. At the core of iRacing is the driving simulation. iRacing began with a new, proprietary tire model that was partly based on the company's own research in a tire testing facility. On June 22, 2011, iRacing began a limited release of a new theoretical tire model which had been in development for three years. This new model used the construction and physical properties of the tire to simulate the tire's response, rather than matching to empirical data.〔(【引用サイトリンク】title = The Sticking Points in Modeling Tires )〕 iRacing receive full "shop access" to every vehicle modeled in the service to calculate physical and inertia parameters of individual parts. Vehicles are either laser scanned or CAD data is used to recreate the visual and physical properties of each car. For aerodynamics data, they have had to rely on data collected from manufacturers and teams,〔 though more recent additions have used computational fluid dynamics to calculate the aerodynamic properties of the cars more accurately. The simulation is criticized for missing some features often found on comparable products; for example environment conditions such as temperature are static, though dynamic temperatures are in use as of July 2015.〔 Racing within the service is managed by a sanctioning body called FIRST. The detailed rules for official competition are published in a document titled the FIRST Sporting Code, which registered members of the service are expected to read. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「IRacing.com」の詳細全文を読む スポンサード リンク
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