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Computer-aided design (CAD) is a general term for the powerful tools used for creating, viewing and analysing designs on a computer.
In the early days of CAD the software mimicked the manually produced two dimensional engineering drawings but as the graphical power of computer increased three dimensional CAD has become the norm.
Modern computers with powerful graphic processors and high-end software make it possible to manipulate almost photo-realistic models with very smooth motion and do actions such as push a cross-sectional plane through a complex object in real-time.
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