Changes

In [[Building Geometrical Constructions in CubeCAD | CubeCAD]], geometric objects are simply grouped together by their color. They do not have any physical properties. In all of [[EM.Cube]]'s computational modules, however, you need to assign physical properties to each geometric object. In From an electromagnetic modeling point of view, the difference between a material block and a free-space region is the constitutive relations that govern the electric and magnetic fields in these media and/or their boundary conditions. In [[EM.Cube]]'s computational modules, geometric objects are grouped together by their common physical properties as well as their color. The types of physical properties may differ in different computational modules, but they are typically related to the material properties or boundary conditions.

From an electromagnetic modeling point of view, materials are categorized by the constitutive relations or boundary conditions that relate electric and magnetic fields. In general, an isotropic material medium is macroscopically characterized by four constitutive parameters: