×

Textured sphere and spherical environment map rendering using texture map double indirection

  • US 5,561,756 A
  • Filed: 06/07/1995
  • Issued: 10/01/1996
  • Est. Priority Date: 05/08/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. In a rendering system for generating pixel values for rendering textured spheres and spherical environment maps, said rendering system utilizing a screen look-up table to identify pixel values in a texture map corresponding to pixel addresses in said screen look-up table, a method for generating said screen look-up table comprising the steps of:

  • a) identifying a projection orientation of a textured sphere;

    b) generating a set of look-up addresses for a first scanline of a plurality of scanlines in a display window;

    c) storing said set of look-up addresses for said first scanline;

    d) for each of the scanlines in said plurality of scanlines other than said first scanline in said display window;

    scaling said look-up addresses for said first scanline by a factor corresponding to the position of the scanline being processed; and

    storing said scaled look-up address in a corresponding location of said screen look-up table.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×