金型設計用3次元CADシステムの開発(第3報) : 対話型形状設計法(2) : 処理の高速化と線画抽出

概要

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The second paper describes the basic algorithms to obtain shaded pictures on CRT display from TIPS-1 geometric database by interactive operation. However, from the practical point of view, the algorithms in the second paper are not enough with respect to the processing time and required storage of the data in the CPU memory. In the first half of this paper, some techniques for further improvement in the algorithms in the second paper are discussed. And then, in the latter half of this paper, a methodology of the generation of line-drawings from the described shaded pictures is presented. Line-drawing are composed of the contour and profile edges of the object shape which are extracted from the described shaded pictures. And, line-drawings require less processing time to transmit the display data from computer to graphic display, because the data of line-drawings are less than those of shaded pictures. Therefore, it is important and desirable to make a system that has the capability of getting not only shaded pictures but also line-drawings.
1987-06-05