ABSTRACT
Computer aided design (CAD) and geographic information systems are being used more and more in the development of plans and products as well as for visualization, surveying, and location-based services. Information systems that involve geometry are used for many different purposes. One could classify CAD as one such family of systems; this, in turn, is often related to another family of systems, “computer aided manufacturing”. In general, 3D object construction is a complicated process. It is also relatively time-consuming, as part of it still needs to be performed manually. In addition to the 2D drawings describing accurate designs of objects to be constructed, there are also plenty of examples of 3D CAD models, which are generated in the design process. The semantic content of models can also be organized by arranging the data according to aspects of design and manufacturing or life cycle stages.
