Development, of the 3-Dimensional CAD System for Injection Mold Design (2nd Report)

Interactive Geometric Modeling

Abstract

The mold design system SMDS which was presented at the first report has conversational functions to build up a mold object. This paper describes the method of building up a 3-dimensional object by interactive operations in SMDS. The concept of geometric modeling in this system is based on solid modeler TIPS-1 system. In the TIPS-1 system, 3-dimensional shape is described by TIPS-1 shape description language and represented by set operations of several segments. And geometric data are generated by batch process. In this paper, a theoretical approach to the interactive object modeling is discussed. Secondly, the algorithms are described that realize the interactive object modeling and also output shaded pictures of the object on a raster-scan display. And some results of shaded pictures are presented.