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Computer-aided design (CAD) is used for designing real and virtual objects. CAD is not only shapes. The output of CAD ordinarily must also consist of symbolic information, such as materials, processes, dimensions and tolerances according to application-specific conventions. CAD may be used to design curves and figures in 2-dimensional (2D) space, or curves, surfaces and solids in three-dimensional (3D) space. CAD is widely deployed in a number of applications, inclusive of automotive, ship-building and aerospace industries, industrial and architectural design, prosthetics and others. CAD is also widely used to produce computer animation for special effects in movies, commercials and technical instructions. CAD is deployed for designing tools and equipment as well as for drafting and designing all types of structures, from small residential buildings to large commercial and industrial structures, such as hospitals and factories. Computer-aided design is primarily used for detailed engineering of 3D models and/or 2D drawings of physical constituents, but it is also deployed throughout the engineering process. Computer-aided design has become a particularly significant technology within the range of computer-aided technologies, as it saves time and money. In the late Eighties when the Computer-Aided Design programs became widely available, there started massive downsizing in drawing departments of small and mid-size businesses. A CAD operator could replace 3-5 drafters deploying traditional methods. Furthermore, many engineers began to do their own drafting projects, therefore the need for traditional drawing departments vanished. As a result of, a large number of drafters were made redundant. Since the advances were rather expensive, only large companies could afford them. Hence, small businesses were unable to contend against giant companies that extensively deployed CAD. At present, prices are reasonable. Even high-end software packages need cheaper platforms and some even support multiple platforms. Additionally, there have been developed various software packages to convert CAD files to other formats.
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