| 摘要 |
A hidden line processing method includes the steps of obtaining the maximum value PZmax of the Z-axis direction component of each vertex in a viewpoint coordinate system for each of the plurality of polygons; sorting the plurality of polygons in a descending order based on the obtained maximum values PZmax; obtaining a value LZmin that is the smaller of the Z-axis direction components in the viewpoint coordinate system of two end points of an arbitrary line obtained from the plurality of polygons; and comparing the maximum value PZmax of the Z-axis direction component of the plurality of polygons with the value LZmin that is the smaller of the above obtained Z-axis direction components of the arbitrary line, in the sorted order, wherein at the time when LZmin>=PZmax, determination of whether or not the lines are hidden lines is avoided for polygons subsequent to the plurality of polygons sorted.
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