Methods of solid modeling
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Cad assignment
The two basic methods used to create solid models are Constructive Solid Geometry (CSG) methods and Boundary Representation (Brep) methods. CSG uses solid primitives (rectangle prisms, spheres, cylinders, cones, etc.) and Boolean operations (unions, subtractions, intersections) to create the solid model. Brep methods start with one or more wireframe profiles ,and create a solid model by extruding, sweeping, revolving or skinning these profiles. The Boolean operations can also be used on the profiles themselves and the solids generated from these profiles. Solids can also be created by combining surfaces, which often have complex shapes, though a sewing operation. This can be used, for example, to create the body of an aerodynamic vehicle such as a car, with its carefully designed body profiles. These two methods can often be combined in order to create the desired parts. Each of these methods has its limitations, and parts which are very difficult to create using just one or the other method can be created much more easily using a combination of both methods. Thus, most commercial solid modelling systems are hybrids using both CSG and Brep methods...