| 摘要 |
PURPOSE:To offer a method and device for rotating a graphic in three- dimensional computer graphics whose operation is easy by eliminating the slanting of the height direction of the graphics even when complicate rotating operation is performed by varying the order of matrix arithmetic. CONSTITUTION:When a valuator 3 input an instruction for rotational conversion of an X, a Y, and a Z axis to a CAD main body 4, coordinate information on the graphics represented by a three-dimensional space coordinate system is converted by the matrix arithmetic in the order of the Y, Z and Z axes. Consequently, when the graphics is a solid, the graphics is rotated on the axis of the height direction of the body as the Y-axis rotation and the figure is displayed on a display 5. |
