| 摘要 |
<p>Data with two-dimensional coordinates can be used by simply expanding them to data with three-dimensional coordinates, and three-dimensional polygons can be accurately displayed on a screen.</p><p><Paragraphs id="pa02" num="0002" xmlns:base="http://www.sipo.gov.cn/XMLSchema/base">Three-dimensional models with three-dimensional coordinates for a certain area to be displayed on the screen based on coordinates of a reference position are received. The received three-dimensional models are classified according to the positions of nodes of polygons for the three-dimensional models. As for the three-dimensional models of which the nodes of the polygons exist on the same plane, they are displayed on the screen through automatic triangulation using a general three-dimensional graphic library. As for the three-dimensional models of which the nodes of the polygons do not exist on the same plane, they are displayed on the screen by converting the three-dimensional coordinates of the nodes of the polygons into three-dimensional coordinates based on a view point, converting the converted three-dimensional coordinates into two-dimensional coordinates through projection conversion onto a projection plane, and converting the two-dimensional coordinates into screen coordinates. According to the present invention, the amount of calculation in the general three-dimensional graphic library is reduced, thereby shortening processing time. Further, three-dimensional polygons that cannot be processed in the general three-dimensional graphic library can be accurately processed and then displayed on the screen.
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