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database server provides the data needed to run the simulation and descriptions of the objects shown to the user. A visualization system takes the output of the simulation and renders it on the display system. The input/output controller accepts input from the navigation device and from the tracking system, and outputs feedback and sound. All of this must happen simultaneously, ideally every thirtieth of a second, to provide smooth animation.
The functions of a VizSim system may be distributed among several computers or concentrated in a single PC, depending on the complexity of the requirements. Systems range in price from a few thousand dollars up to multimillions-in 2002 the average price worldwide was $141,510. -B.D.
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