| 摘要 |
PROBLEM TO BE SOLVED: To prevent a phenomenon wherein a part of a drawing figure is displayed or is not displayed in pixel units by calculating a Z value of the same pixel of each of both figures to the same value when performing hidden surface removal processing using the Z value and overwriting the plurality of figures on the same plane. SOLUTION: The plane that is a reference is designated, and the Z value of each point on the reference plane is uniquely calculated in the reference plane on the basis of the Z value of a drawing start point, a gradient dZdx in an X-direction of that Z value, and a gradient dZdy in a Y-direction of that Z value. Accordingly, because the Z value of each the point becomes an equal value about the plurality of figures on the same plane, the figure drawn afterward is certainly drawn in the plurality of figures on the same plane as long as it is set such that rewriting of the figure is performed even if the Z value is equal. COPYRIGHT: (C)2007,JPO&INPIT |
