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Generating CAD models from sketches

: Roth-Koch, S.

Cugini, U. ; International Federation for Information Processing -IFIP-, Working Group 5.2 Computer Aided Design:
From geometric modeling to shape modeling : IFIP TC5 WG5.2 Seventh Workshop on Geometric Modeling: Fundamentals and Applications, October 2-4, 2000, Parma, Italy
Boston: Kluwer Academic Publishers, 2002 (IFIP 80)
ISBN: 0-7923-7635-8
Workshop on Geometric Modeling (GEO) <7, 2000, Parma>
Conference Paper
Fraunhofer IPA ()
CAD models generation; two-dimensional sketches; three-dimensional CAD curves; conceptual sketches; conceptual designer; virtual sketch model; fuzzy-spline curves; wireframe modeller; surface modeller

The ultimate goal of the application described in this paper is the conversion of two-dimensional sketches into three-dimensional CAD curves and surfaces. The first creative step of planning and outlining a conceptual idea often is realised in so-called scribbles (conceptual sketches). Normally, they are scribbled with pencils on sheets and thus only can be used for background information to develop the virtual three- dimensional shape. A new method enables the conceptual designer to scan paper scribbles and afterwards convert them into a virtual sketch model. The virtual sketch model includes all the "fuzziness" of the scribble and the therein expressed conceptual steps but is automatically represented in a sequence of real B-Spline curves. The conceptual designer can develop it into the final concept and into the three- dimensional CAD elements.