Polygon data generation method and image display apparatus using same
US6600485B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 2000 |
| Grant date | Jul 29, 2003 |
| Priority date | — |
| Expiry date | Mar 3, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T17/30
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.