There have been numerous and dramatic changes in graphics technologies used in engineering design during the last thirty years.  Computer models that represent the geometric characteristics of parts and assemblies are used extensively in design, analysis and manufacturing.  This paper briefly describes these new geometric models used in contemporary CAD software, including wireframe, surface, solid and parametric models.  Their use in engineering design and analysis is reviewed.  The impact of these new technologies on the engineering design graphics curriculum is discussed.

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3-D Geometric Modeling for the 21st Century

The implementation of parametric modelling in industrial and design enterprises has resulted in the ability of computer graphics users to reduce redundant labour practices by the creation of interactive databases. Designers and production staff now have the luxury of being able to edit these databases rather than always having to redesign models that are required to meet current needs or updated specifications. The regeneration of parametric models now allows reduced time in "art-to-part" production as well as providing a foundational database upon which future product development and revisions may rest. However, the large learning curves of most parametric modeling software packages more often than not make their introduction into manufacturing enterprises a slow and arduous experience. There are solutions to this ramp-up time that can allow manufacturers the ability to educate their computer users in the use of parametric modelling packages, and at the same time respond to the evolving needs of their enterprises.

Parametric modelling: concept and implementation

Introducing solid modeling

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Introducing solid modeling

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3-D Geometric Modeling for the 21st Century

Parametric modelling: concept and implementation

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