An Introduction Most geometric objects we see every day are solids. That is, they are geometric objects with their interiors rather than only their surfaces.
Solids can be very simple like a cube or very complex like a piston engine.
To be processed by computers, solids must have some representations that can describe the geometry and characteristics completely. While no representation can describe all possible solids, a representation should be able to represent a useful set of geometric objects. When you see a representation of a solid, you will know what is being represented without any doubt. An unambiguous representation is usually referred to as a complete one. That is, there is only one way to represent a particular solid.