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US5278949A Polygon renderer which determines the coordinates of polygon edges to sub-pixel resolution in the X,Y and Z coordinates directions 失效
多边形渲染器,其确定X,Y和Z坐标方向上的多边形边缘到子像素分辨率的坐标

  • Patent Title: Polygon renderer which determines the coordinates of polygon edges to sub-pixel resolution in the X,Y and Z coordinates directions
  • Patent Title (中): 多边形渲染器,其确定X,Y和Z坐标方向上的多边形边缘到子像素分辨率的坐标
  • Application No.: US669150
    Application Date: 1991-03-12
  • Publication No.: US5278949A
    Publication Date: 1994-01-11
  • Inventor: Larry J. Thayer
  • Applicant: Larry J. Thayer
  • Applicant Address: CA Palo Alto
  • Assignee: Hewlett-Packard Company
  • Current Assignee: Hewlett-Packard Company
  • Current Assignee Address: CA Palo Alto
  • Main IPC: G06T15/87
  • IPC: G06T15/87 G06F15/62
Polygon renderer which determines the coordinates of polygon edges to
sub-pixel resolution in the X,Y and Z coordinates directions
Abstract:
A polygon rendering circuit for a computer color graphics system comprising an edge stepper which steps along edges of an input polygon to determine the span of the polygon along each scan line intersected by the polygon. The coordinate values of the edges on each scan line are determined to sub-pixel resolution such that only those pixels whose centers lie within the true polygon edges (within the span width) must be drawn. Processing efficiency is improved and bandwidth is minimized by passing only those edges of the polygon which are new to that polygon and by computing the Z values in the same manner as, and in parallel with, the X values. Improved results are also possible in accordance with the technique of the invention, for since adjacent polygons compute the same edge by stepping, there can be no gaps between polygons due to round-off errors.
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