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Proceedings Paper

Fast surface design based on sketched networks
Author(s): Casper G. C. van Dijk
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Paper Abstract

Computer aided design of freeformed surfaces is strongly biased towards input and optimization of surfaces. Input modules are based on digitizing drawings or placing and manipulating spline control vertices. Design, especially during the idea generation (or conceptual) design phase, is poorly supported. We present a system based on direct manipulation of shaded images of the surfaces. The designer sketches profiles on a tablet. The profiles are positioned in object space with a spaceball (6D joystick). A network of crossing curves is built interactively. The system constructs patches over this network in realtime. The designer can correct a profile by sketching. The affected surfaces are updated immediately. Patches are defined by the curves and estimated cross-boundary derivatives. They connect with G1 continuity. Our prototype surface modeler avoids the need for exact dimensions and precise coordinates, as seen in traditional systems. Instead, it supports fast, intuitive generation and evaluation of surfaces. We discuss a comparison with other systems regarding the time needed to model shapes, and some opinions of professional industrial designers.

Paper Details

Date Published: 1 November 1992
PDF: 11 pages
Proc. SPIE 1830, Curves and Surfaces in Computer Vision and Graphics III, (1 November 1992); doi: 10.1117/12.131740
Show Author Affiliations
Casper G. C. van Dijk, Delft Univ. of Technology (Netherlands)

Published in SPIE Proceedings Vol. 1830:
Curves and Surfaces in Computer Vision and Graphics III
Joe D. Warren, Editor(s)

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