DQ:18.1 OVERVIEW
Ȧã§ãX§ãA model is used to mathematically capture some aspect of the real world so that it may be manipulated, studied, tested, etc.
To computerize a design we will capture a very explicit model of a part in a computer program.
Geometry is by far, the most important part of any design. It is used as a reference for tolerances, processes, functions, materials, assemblies, etc.
Three major functions in geometric modelling,
The Geometric Representation determines what a system can do.
There are a number of methods of representing geometry, 1D, 2D, 2.5D, 3D
2.5D - Points have an x, y coordinate, and height. This is a special case which can describe raised surfaces like buildings.
2D models are quickly becoming obsolete, 2.5D models were an early compromise, but 3D models are quickly becoming the standard.
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