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Geometry

  • Ian Anthony Stroud
  • Hildegarde Nagy
Chapter

Abstract

This chapter contains an overview of geometry and its use in CAD modelling. There are two types of geometry, analytic and numeric. With analytic geometry the form is explicit and controlled by a few parameters. With numeric geometry the shape is controlled by a set of points, called control points, and the geometric forms are general. Often CAD systems use a mixture, with analytic geometry for a few common forms and numeric geometry for all the rest. The numeric geometry is important for covering all special shapes The chapter explains some basic techniques and common operations used as well as some exercises for using numerical geometry.

Keywords

Control Point Surface Patch NURBS Curve Control Polygon Geometric Entity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag London Limited 2011

Authors and Affiliations

  1. 1.STI-IPR-LICPEcole Polytechnique Federale de LausanneLausanneSwitzerland
  2. 2.LausanneSwitzerland

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