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Resolution-independent method for displaying a three dimensional model in two-dimensional display space

  • US 5,544,291 A
  • Filed: 11/10/1993
  • Issued: 08/06/1996
  • Est. Priority Date: 11/10/1993
  • Status: Expired due to Term
First Claim
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1. A computer implemented method of displaying a three-dimensional model having one or more surfaces, the method comprising computer controlled steps of:

  • providing the three-dimensional model in a computer readable medium of a computer system;

    projecting a parametric surface representation of the three-dimensional model into two-dimensional parametric space;

    selecting surface regions of predetermined shading in the two-dimensional parametric space by;

    a. mapping an array of grid points onto the two-dimensional parametric space;

    b. forming an array of shading values by applying a shading function at each grid point; and

    c. applying a contouring function to the array of shading values to select the surface regions of predetermined shading;

    determining the boundaries of consistent-facing regions boundaries of the consistent-facing regions by applying a silhouette function to the parametric surface representation of the three-dimensional model;

    clipping the regions of predetermined shading by the boundaries of the consistent-facing regions to derive consistent-facing regions having the predetermined shading;

    mapping the derived consistent-facing regions to display space; and

    displaying the mapped consistent-facing regions.

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