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CADCAM software uses a lot of techniques. We can do a tentative classification of them.

Triangles in CAD

Mathematics for CAD 2D and 3D vector computation, viewing, hidden line removal, Splines, Nurbs and Topology. This is also called Computer Graphics<!-- RSEdit -->

Mechanical knowledge You need to have a minimum of knowledge in the field your application is targeting

User Interface Windows, Motif. And all the tools coming around : MFC, OLE, OCX. Related to User interface is all the viewing stuff : OpenGL, Phigs etc...

Programming Techniques For the language C++ is now the only choice. Visual Basic is an alternative for the user interface. Java is a new player. Behind there is all the Object Oriented technology. New are templates and patterns.

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CADCAM An ever growing subject. Visit the beginning.

Standards for exchange, input and output.