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مکانیک::
دستگاه مختصات کاربر محور
6.14.3 USING USER CO-ORDINATE SYSTEMS (UCS)
CAD packages have a facility to define several user co-ordinate systems.
Plane figures can be drawn in these user co-ordinate systems to create a 3-D wire frame model.
A plane figure drawn in a User Co-ordinate System can be assigned a thickness to create a 3-D wire frame model.
Complex 3-D models can be created using a combination of several user co-ordinate systems and thicknesses.
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