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    From raw 3D-Sketches to exact CAD product models Concept for an assistant-system
    (The Eurographics Association, 2004) Diehl, Holger; Müller, Franz; Lindemann, Udo; Joaquim Armando Pires Jorge and Eric Galin and John F. Hughes
    As we try to develop new 3D-Sketching devices we come across the problem of how to transfer 3D-Sketches into exact product models to gain an integrated design system. There are some promising approaches for the retrieving of 3D-geometries out of 2D-Sketches, but nearly none supports the concretization of 3D-Sketches. We are developing an intelligent assistant that supports the designer in the task of concretization. Our higher level goal is a system that uses a cad-kernel and supports the designer from the early stages of sketching up to the modelling of exact product representations.
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    Sketching in Early Conceptual Phases of Product Design: Guidelines and Tools
    (The Eurographics Association, 2004) Ponn, Josef; Lindemann, Udo; Diehl, Holger; Müller, Franz; Joaquim Armando Pires Jorge and Eric Galin and John F. Hughes
    The early phases of product development play a significant role for the success of a product and the prevention of time and money consuming changes in late phases. This paper describes a new methodological approach for the genereration of principle solutions in the form of sketches in early phases of product development. A guideline has been developed for a target-oriented and efficient progression from working principles to principle solutions. In particular, the linkage between physical effects and form parameters (geometry, materials etc.) has been investigated. A computer system including physical effects as features which can be used for the generation of digital principle sketches is described as a vision. Such a system offers the potential of facilitating routine work and supporting the engineer in defining solution concepts at early stages of product design.