Freeform Tools in CAD Systems: A Comparison

ISBN-13: 9783322867742 / Niemiecki / Miękka / 2012 / 280 str.

Josef Hoschek

Opis

From 13th-17th May, 1991 the Centre for Applied Mathematics at the Darmstadt University of Technology and at the University of Kaiserslautern in cooperation with the European Consortium for Mathematics in Industry {ECMIl has organized the Workshop: "Practice of Computer Aided Gemetric Design - What CAD Systems are really capable of." Some of the most im- portant software vendors had been invited to participate in the workshop and to demonstrate their developments in the area of free form surface technology. The following systems were presented: CATIA (IBM/Dassault); EUCLID (Matra); ICEM (CDC); SYRKO (Mercedes-Benzl; STRIM (Cisigraph); UNIGRAPHICS (McDonnel Douglas) and in addition the visualization system WAVEFRONT (mental images) was introduced. The presentations were supposed to focus on the following topics: re- presentation of analytical curves/surfaces; Coons-Eace-Top-Elements; multisurfs; triangular patches; offset surfaces; volume elements; inter- secting algorithms; operations for combination of curves, surfaces and volumes; sweeping elements/fillets; blending methods; parametrization of data; interpolation/approximation of irregular data/NC data; NC control (three axes, five axes milling). - Demonstrations of the systems were also given on work stations. Besides, a qUestionnaire should have given a short overview on the implementations. Beside these presentations of software systems, the participants had the opportunity to hear lectures on developments for interfaces.

Spis treści

I Presentations of CAD Systems.- CATIA/IBM, Dassault.- Curve and Surface Representation in Catia System.- A Case for CAD.- Digitising Sculptured Surfaces.- ICEM / Control Data.- Representations and Operations in the ICEM Systems.- ICEM MESH — A Mesh Generation Tool for Free-Form Surfaces.- STRIM/cisigraph.- Practice of Computer Aided Geometric Design.- SYRKO/Merces Benz.- Car Body Design and Manufacturing with SYRKO.- UNIGRAPHICS/McDonnel Douglas.- Curves and Surfaces in Unigraphics and Parasolid.- EUCLID / Matra.- UNISURF IV — The advanced Solids & Surfaces Module of EUCLID-IS.- II Visualisation System.- WAVEFRONT — MENTAL RAY/mental images.- High Quality Visualization of CAD Data.- III Lectures on Developments for Interfaces.- The Development Methodology of STEP and its Concept for Shape Representation.- Integration of Physical “Phenomena” into CAD.- General Matrix Representation for NURBS Curves and Surfaces for Interfaces.- Approximate Conversion and Merging of Spline Surface Patches.- IV Questionnaire on Curve/Surface/Volume Implementations.- ANSWERS — Part I (EUCLID, STRIM, ICEM).- ANSWERS — Part II (UNIGRAPHICS, SYRKO, CATIA).- V Excerpts of the Panel Discussion.