Polygon data generation method and image display apparatus using same
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United States of America Patent
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Jul 29, 2003
Grant Date -
N/A
app pub date -
Mar 3, 2000
filing date -
Jul 3, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for generating polygon data from NURBS (non-uniform rational B-spline) data representing a parametric surface and an image display apparatus using that method are disclosed. In the method for generating polygon data, NURBS object data are coordinate-converted to coordinates having the viewing point as the origin, in correspondence with the advance of a program. Furthermore, the level of detail wherewith the object is drawn on the display is determined, the number of divisions into polygons when converting NURBS object data to objects configured by polygons is found, according to the determined level of detail wherewith objects are drawn, and vertices of polygons converted to according to that number of divisions are computed. Furthermore, polygons for which all vertices among the computed vertices are off the display screen displayed on the display, and all polygons which are front/back-determined to be backward and which do not have a front-and-back display attribute are deleted, and the vertex attributes are computed for the vertices of the remaining polygons. Rendering processing is also performed on the remaining polygons.
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