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There are always features which allow details to be magnified, and the view to be ‘panned’ across to other parts of the drawing. More importantly, all programs provide wide-ranging tools for selecting, manipulating and correcting a drawing’s contents. Drawings are always built using primitive objects such as lines, circles and arcs. CAD programs make few concessions to beauty, being geared towards the clear and accurate presentation of technical information.Īll CAD programs, from budget to professional systems, perform broadly similar functions. While Art packages concentrate on the end result, CAD programs focus on the subject – the item represented in the document is more important than the document itself.
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It’s useful to distinguish between CAD programs and Object-Oriented Art packages such as Corel Draw!. When a detail of a CAD drawing is magnified, the program re-calculates the drawing so that it’s displayed to the screen’s best abilities.
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Because the drawings are Object-Oriented, there’s no link between what’s visible on the screen and the accuracy of the drawing. CAD drawings contain collections of geometrical objects such as ‘lines’, ‘circles’ and so on, which are stored to extremely high levels of accuracy – sometimes 14 places of decimals. Although a picture portrays lines, circles and arcs, the program doesn’t understand the content. Paint programs, such as Windows Paint, store pictures rather like a sheet of graph-paper with squares filled in. The most important distinction between CAD and other drawing programs is how data is stored. What exactly is CAD? CAD programs are Design and Technical Drawing tools which bring benefits such as speed and ease of change over manual methods. AutoCAD LT effectively replaces Generic CADD, and by linking it closely with AutoCAD Release 12, the company hopes to make a breakthrough in this market. Autodesk themselves have enjoyed considerable success in the low-cost market with AutoSketch, but until now Generic CADD was their only mid-priced product. TIM BATY assesses one of the first production copies.Įver since Autodesk’s AutoCAD persuaded everyone that Computer-Aided Design (CAD) was viable on the IBM PC, competitors have developed programs with similar features, but at lower prices.
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Autodesk have set the Mid-Price CAD market alight with a new low-cost version of the Crown King of desktop CAD – AutoCAD LT.
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