Computerization has come to our society rapidly in recent years. In particular, most processes of production are now automated in industrial fields. Owing to this computerization, even in fields of design which require imaginary processes, it is also being done. Thus, may professional designers are forced to design new products in restricted environments such as CAD systems. Today, many designers generate prototype shapes of products with actual objects like clay. It is the best method to design a product full of originality. However, it is difficult to convert the actual model to CAD data using even the latest tools and CAD systems. Our team has developed 3D shape modeler (3DSM). The 3DSM can generate the lost entities from measured data of an actual model. This system provides an interactive interface to generate the geometry of lines, planes and filet entities. ALso, as this systems is equipped with a stereoscopic display and a 3D mouse, it provides users with 3D environments. Thus, users can get a sense of the designed shape in the display.