| 摘要 |
PURPOSE:To produce a triangular patch with no indication given to a computer even with a complicated form by securing the correspondence among several connection areas on the adjacent two planes obtained by cutting a 3-dimensional object with plural parallel planes. CONSTITUTION:Picture data on the display subjects on two adjacent planes are divided into several connection areas enclosed by the closed broken lines. Then those data set on the lower plane are defines as L1...LF and the data on the upper plane are projected on the lower plane to obtain data U1, U2.... Thus areas F1<i>...Fq<i> are obtained to satisfy the conditions of equations, where phishows an empty gathering. Then the boundary point is obtained between Fj<i> and Uj of an equation Fj<i> phi, and the boundary point string of Fj<i> and that of Uj are allowed to correspond to each other. Thus the triangle face elements are obtained. The procedure for production of these triangle face elements can be processed automatically even in case the connection areas are separated or joined together. |
