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Gametrak is a brand of 3-dimensional game control systems based on position tracking, designed for home video game platforms such as video game consoles and personal computers. The first Gametrak was invented in 2000 by Elliott Myers, who developed and guided the Gamester video game peripheral range for Leda Media Products and later Radica Games. Myers founded gaming company In2Games around Gametrak in November 2000. The main hardware for the original Gametrak is the base unit, a weighted device positioned on the floor in front of the display. The base unit communicates with the console or PC by Universal Serial Bus. and also features an attached foot-pedal input. ==Technology== The Gametrak uses a patented mechanical system for tracking position of physical elements in three-dimensional space in real time. The base unit features two identical mechanisms, each of which can determine the three-dimensional coordinates of an associated element relative to the mechanism. Each mechanism contains a retracting cable reel and a small tubular guide arm from which the cable passes out. The guide arm is articulated in a ball joint such that the arm and ball follow the angle at which the cable extends from the mechanism. At the end of the cable is a fastener for connecting to the tracked element. The distance of the tracked element from the mechanism is determined through components which measure the rotation of the spool drum for the retracting cable reel, and calculating how far the cable is extended. Through the ball joint and guide arm, the mechanism functions in a similar fashion as a gamepad analog stick to determine the angular direction from the mechanism to the track element.〔 From the distance and angle data, a three-dimensional position for the element is resolved. The predetermined spacing and orientation of the mechanisms on the base unit allows the coordinate data gathered by the two mechanisms to be converted into positions in a unified space. According to In2Games, the mechanisms can determine position "to an accuracy of 1 millimetre anywhere within a 3m cube around the unit, with no processor overhead or time delay." By tracking two positions, it is possible to independently track two different objects, or the position and orientation of a single object, such as a sword or baseball bat. The Gametrak includes special fingerless gloves, each with a fastener along the outside edge for attaching a tether cable, allowing the system to track both of a user's hands. Haptic functionality was planned to be incorporated into future revisions of the original Gametrak, in which supplementary retraction forces on the tension cables would be dynamically increased or decreased to simulate various effects.〔 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「Gametrak」の詳細全文を読む スポンサード リンク
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