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Proceedings of CAD'14, 2014, 23-25
A Framework to Support 3D Explicit Modeling Education and Practice

Harald E. Otto, Ferruccio Mandorli, Polytechnic University of Marche

Abstract. Recently a new approach to modeling in computer-aided design for mechanical engineering (MCAD) has emerged. It is referred to as 3D explicit modeling, and also sometimes known as direct modeling. This modeling approach is based on the definition of 2D regions, which can be pushed, pulled, and twisted interactively, to manipulate the shape of a CAD model. Geometric constraints, along with so-called driving dimensions, can then be placed directly on the 3D model allowing for geometric rearrangements according to desired functionality. One major objective in the development of this modeling technique was to overcome difficulties related to the editing and reuse of feature-based CAD models. Feature-based systems were introduced with the aim of providing modeling systems capable of facilitating both the initial design/modeling phase and the editing and reuse of geometric models afterwards. However, what was intended to be a triumph of feature-based systems, supported by parametric functionalities, the single modeling operations (feature) and the design feature history tree, has unfortunately turned out to have some significant disadvantages. Without knowledge relating to the original design intent and initial use of features, feature history trees tend to become complex and ambiguous to the point of being incomprehensible.

Keywords. CAD Education, functional dimensioning, geometric product specification standard

DOI: 10.14733/cadconfP.2014.23-25