Method and apparatus for drawing three-dimensionally by a plurality of points on the stereoscopic two-dimensional display screen in a computer graphics system

摘要

PURPOSE: To provide method and device for plotting the points of a solid so that calculating processing is simple and reduced in the case of three- dimensionally plotting a solid from plural points on a two-dimensional display screen, points are uniformaly arranged on the faces of the solid and further, the direction of the solid can be easily grasped even after the solid is rotated on the two-dimensional display screen. ;CONSTITUTION: In order to three-dimensionally plot the solid by using plural points on the two-dimensional display screen, the surface of the solid is divided into plural areas and on these plural areas, the points are arranged based on mutually different rules. In the case of plotting a rotational object from points, the face forming the rotational object is divided into a 1st area, where the change of a radius of gyration from a axis of gyration is comparatively remarkable, and a 2nd area, where the change of the radius of gyration is comparatively a little, such as a spherical object is divided into polar areas Np and Sp and an equatorial area Es, for example, and according to the mutually different rules, the points are arranged in the respective areas.;COPYRIGHT: (C)1995,JPO