VLEGO - A SIMPLE 2-HANDED 3D MODELER IN A VIRTUAL ENVIRONMENT

Modeling 3D objects in a virtual space has many advantages such as int uitive manipulation. To generate the 3D objects efficiently and precis ely, it is useful to introduce optimal assisting methods by software i nstead of using the special equipment of force feedback displays. On t he basis of this idea, we develop a 3D modeler VLEGO in a virtual envi ronment. VLEGO simulates toy blocks, and introduces a number of manipu lation assisting methods for virtual object manipulation. The methods have the following three features: (1) limiting the relative positions of primitives in discrete fashion, (2) detecting mutual interference among primitives, and adjusting the positions to avoid collision, and (3) making flexible two-handed manipulation possible by the use of two 3D cursors. Thus, VLEGO can provide a virtual environment in which th e intuitive and precise generation of shapes is possible without train ing. In this paper, the design principle and basic functions of VLEGO are described, and the effects on the working efficiency of the virtua l object manipulation assisting methods of VLEGO are evaluated by expe riments. (C) 1998 Scripta Technica.