Methods of producing an electronic geometric model, and systems which perform the methods are disclosed. In some embodiments, the method includes accessing electronic data, the data including polygonal data defining a reference object and a mesh of polygonal data points, the mesh including a plurality of edges. Such methods also include selecting an edge of the mesh, and in response to an indication from a user determining locations for additional data points, where the locations are adjacent to the selected edge and contact portions of the reference object. Such methods also include inserting the additional data points into the accessed data at the determined locations, and subdividing the accessed data having the additional data points with a subdivision algorithm, whereby subdivided data is generated. Such methods also include generating the geometric model based on the subdivided data, and storing the geometric model in a computer readable data storage.