Modelling method and system

A geometric modelling method performed by a data processing system on a geometric model comprising a kernel and associated applications, the method comprising:

• receiving data for an object including mesh data for mesh regions of the object and classical geometry data for classical geometry regions of the object to be processed by the kernel including inputting the data in history-based modelling functions of a user interface application;
• establishing a relationship between the mesh regions of the object and the classical geometry regions of the object;
• propagating, based on the established relationship, changes in the data for one of the mesh regions or one of the classical geometry regions to the other of the one of the mesh regions or the one of the classical geometry regions, regardless of a data format of the data, wherein the propagating comprises applying an offsetting, shelling, or thickening operation to the mesh data without conversion of the mesh data to the classical geometry data;
• generating a standalone object for the user interface application of the geometric model;
• and
• storing, with the user interface application, the standalone object separately and outside the kernel,
• wherein the standalone object is an independently implemented object in the user interface application relative to the object to be processed by the kernel.