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Predictive look ahead memory management for computer image generation in simulators

  • US 4,952,922 A
  • Filed: 07/18/1985
  • Issued: 08/28/1990
  • Est. Priority Date: 07/18/1985
  • Status: Expired due to Fees
First Claim
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1. A method for use in a system which projects a time varying computer generated image scene representation of terrain as viewed from a moving vehicle which traverses a simulated path, said image scene being derived from a data base stored in secondary storage, said method comprising the steps of:

  • predicting a set of possible future positions of the vehicle after a predetermined time interval, said predicted positions being calculated based on the motion dynamics of the vehicle;

    for a number of possible future positions, sampling the terrain data base with line-of-sight rays projected from the position of the vehicle operator'"'"'s eye into the data base in cartesian coordinate space;

    marking the data at the point of sample ray terrain surface intersection and the data for surfaces adjacent to that point as likely candidates for near-future display update;

    accessing the marked data and storing them in high speed main memory; and

    displaying selected ones of the stored data segments based on the simulated path and position of the vehicle after the predetermined time interval has elapsed;

    whereby a rapid update of the displayed terrain in the near future is achieved.

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