US Patent 10235493 Simplifying a computer-aided design model while retaining references

A computer-implemented method constructs a three-dimensional (3D) model, deletes data defining two or more features of the 3D model, and creates a new feature to replace the two or more features. Each of the two or more features has a set of faces, and a reduced amount of data is associated with the new feature with respect to the amount of data defining the two or more features. The method maps unique identifiers, enabling references to be retained and preventing a failure of an operation that uses the reference.