Changes
/* Physical Structure & 3D Mesh Generation */
=== Defining Groups Of PEC Objects ===
[[Image:wire_pic1.png|thumb|350px|EM.Cube]]Libera's [[MoM3D ModuleNavigation Tree.]] EM.Libera features two different simulation engines: Wire MoM and Surface MoM. Both simulation engines can handle metallic structures. The Wire MoM engine models metallic objects as wireframe structures, while the Surface MoM engine treats them as perfect electric conductor (PEC) surfaces. The PEC objects can be lines, curves, surfaces or solids. All the PEC objects are created under the '''PEC''' node in the '''Physical Structure''' section of the Navigation Tree. Objects are grouped together by their color. You can insert different PEC groups with different colors. A new PEC group can be defined by simply right clicking on the '''PEC''' item in the Navigation Tree and selecting '''Insert New PEC...''' from the contextual menu. A dialog for setting up the PEC properties opens up. From this dialog you can change the name of the group or its color. Note that PEC object do not have any material properties that can be edited. [[File:wire_pic1.png]] [[File:wire_pic2.png]] Figure 1: [[MoM3D Module]]'s Navigation Tree and its PEC dialog.
=== Defining Dielectric Objects ===
Of the two simulation engines of [[EM.Cube]]'s [[MoM3D Module]] only the Surface MoM solver can handle dielectric objects as dielectric materials cannot be modeled by wireframe structures. Dielectric objects are created under the '''Dielectric''' node in the '''Physical Structure''' section of the Navigation Tree. They are grouped together by their color and material properties. You can insert different dielectric groups with different colors and different permittivity e<sub>r</sub> and electric conductivity s. Note that a PEC object is the limiting cases of a lossy dielectric material when σ → ∞.
* Click the '''OK''' button of the dielectric material dialog to accept the changes and close it.
<table><tr><td> [[FileImage:FDTD5wire_pic2.png|thumb|350px|EM.Libera's PEC dialog.]] </td> Figure: <td> [[Image:wire_pic3.png|thumb|350px|EM.Cube]]Libera's material listDielectric dialog.]] </td></tr></table>
=== Moving Objects Between Groups & Modules ===
