Если просто необходимо сделать плоский чертёж, без создания 3D модели, вполне сойдёт AutoCAD, Компас и другие не сложные програмки. Для создания 3D модели используют более навороченые програмки. Если необходимо создать сборку механизма, то я лично пользуюсь Inventor-ом (Компас и SolidWorks так-же подойдут).
Для создания объёмных тел со сложной геометрией (корпус корабля) у нас в конторе пользуются SeaSolution-ом и ProEnginer-ом.
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