Geometric modeling is an integral part of any Computer-Aided-Design (CAD) system. A geometric model is defined as the complete representation of graphical and non-graphical information of an object. Geometric modeling provides the user to construct a geometric model of an object on a CAD/CAM system by inputting the object data as required by the modeling technique via the user interface provided by the software. The software then converts such data into a mathematical representation which it stores in the model database for later use. The user may retrieve and edit the model during the design and (or) manufacturing process using the model database.
Geometric modeling is the starting point in a CAD/CAM system for the product design and manufacture. Thus, a geometric model has become a core for the other CAD functions such as finite element analysis (FEM), automated drafting to produce engineering drawings (CADD) and generating NC programs to make parts on NC/CNC machines.