This law provides a quantitative relationship to check the validity of the topological representation of a solid. Each modeling system has its advantages and disadvantages.
Most modeling systems are combinations with algorithms for conversion between the systems.
Advantages and Disadvantages Systems Complexity Uniqueness History of Constr. A feature conveys to the user geometric, topological and additional engineering information. Features are usually combined using a CSG type of approach. Each new feature is created with reference to existing features. Values of these parameters and their logical relationships determine the final shape and size of these objects.