A physical structure in [[EM.Cube]] in typically made up of one or more geometric objects, which you either draw in its project workspace or import from an external CAD model file. In [[EM.Cube]], geometric objects are generally categorized into solids, surfaces, curves and special objects, which include points and fractal trees.
When you start the [[EM.Cube]] application, you land in its [[CubeCAD]] module by default. [[CubeCAD]] is a comprehensive, parametric, 3D CAD modeler along with integrated mesh generation, data processing and visualization capabilities and a powerful Python scripting environment. With the click of a few buttons, you can build complex 3D models and structures in seconds using a large variety of intuitive mouse-based object creation and transformation tools. Import and export of standard CAD formats allow for native construction of complex geometries along with the ability allows you to fly in external CAD models with utmost ease. Imported structures can easily be augmented with your own geometrical constructions created using the native [[Standard Objects|standard objects]].
All of [[EM.Cube]]'s computational modules use [[CubeCAD]] together with individually customized navigation trees as their graphical user interface and geometry definition utility. Once you have mastered the basics of [[CubeCAD]], using the other modules will be very straightforward.