×

Incremental terrain image generation

  • US 4,583,185 A
  • Filed: 10/28/1983
  • Issued: 04/15/1986
  • Est. Priority Date: 10/28/1983
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of real-time computer generation of visual scenes comprising the steps ofstoring a grid data base of elevation posts at predetermined intervals for the visual scene to be generated,defining a horizontal field of view as a predetermined number of sweep increments perpendicular to a boresight at a view point,incrementing the change in range Δ

  • R from the view point and for each sweep, defining the changes Δ

    X and Δ

    Y in said grid data base,accumulating Δ

    X and Δ

    Y to generate an X,Y data base address for extracting the elevation for that sweep element,for each range increment Δ

    R, stepping a view ray down by a increment of Δ

    R Tan φ

    m, where m refers to the mth view ray,for each range increment Δ

    R, increasing the distance between sweeps by the increment Δ



    Tan φ

    ,comparing at each range increment the accumulated elevation value of the view ray with the elevation extracted with said X,Y data base address, andif a view ray strikes an elevation post, reading the data for that post to a display means, otherwise reading the elevation data for the next elevation post from the data base.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×