| 摘要 |
PURPOSE:To obtain the system which is simple and plain, and can be applied to the type of all curved surfaces by using an internal point in order to form a close triangular polygon. CONSTITUTION:A boundary of a curved surface and a boundary curve of a hole are divided into polylines, the curved surface of all boundary curves is converted to the polyline, polyline data is mapped to a two-dimensional parameter space of the curved surface, the curved surface boundary of the outside is formed as a polygon of a base, and by connecting all holes on the curved surface to the polygon of the base so as to form a main polygon, the boundary of the curved surface becomes one polygon. Subsequently, a point contained in the hole of the curved surface is excluded and an internal point is added onto the curved surface, and when necessary, the main polygon is divided into triangular polygons by using the internal point, as well, so that the divided polygon is returned to its original three-dimensional space from a two-dimensional parameter space and a trimmed free curved surface is converted to the polygon. In such a way, by a simple method, the polygon of the curved surfaces is divided into triangles. |
