Abstract
While recent decades have seen significant progress in CAD software, current state of the art still appears insufficient when it comes to the styling design of products. This is evidenced by the fact that a-significant portion of early design activities such as concept development and style generation occurs almost exclusively in 2D environments - be it the traditional pen-and-paper environment or its digital equivalents. The authors describe a pen-based modeling system for the styling design of 3D objects. Their system is tailored toward the rapid and intuitive design of styling features such as free-form curves and surfaces. Basic wireframe and surfaces are constructed and modified using the strategy of curve creation, curve modification, surface creation, and finally surface modification