|-
| style="width:30px;" | [[File:pec_group_icon.png]]
| style="width:150px250px;" | [[Glossary of EM.Cube's Materials, Sources, Devices & Other Physical Object Types#Perfect Electric Conductor (PEC) |Perfect Electric Conductor (PEC) Surface]]
| style="width:300px;" | Modeling perfect metal surfaces
| style="width:250px;" | Solid and surface objects
|-
| style="width:30px;" | [[File:pmc_group_icon.png]]
| style="width:150px250px;" | [[Glossary of EM.Cube's Materials, Sources, Devices & Other Physical Object Types#Perfect Magnetic Conductor (PMC) |Perfect Magnetic Conductor (PMC) Surface]]
| style="width:300px;" | Modeling perfect magnetic surfaces
| style="width:250px;" | Solid and surface objects
|-
| style="width:30px;" | [[File:voxel_group_icon.png]]
| style="width:150px250px;" | [[Glossary of EM.Cube's Materials, Sources, Devices & Other Physical Object Types#Impedance Surface |Impedance /Dielectric Surface]]
| style="width:300px;" | Modeling impedance surfaces as an equivalent to the surface of dielectric objects
| style="width:250px;" | Solid and surface objects
|-
| style="width:30px;" | [[File:Virt_group_icon.png]]
| style="width:250px;" | [[Glossary of EM.Cube's Materials, Sources, Devices & Other Physical Object Types#Virtual_Object_Group | Virtual Object]]
| style="width:300px;" | Used for representing non-physical items
| style="width:250px;" | All types of objects
|}
=== Organizing Geometric Objects by Surface Type ===
You can define several PEC, PMC or impedance surface groups with different colors and impedance values. All the objects created and drawn under a group share the same color and other properties. Once a new surface node has been created on the navigation tree, it becomes the "Active" surface group of the project workspace, which is always listed in bold letters. When you draw a new CAD object such as a Box or a Sphere, it is inserted under the currently active surface type. There is only one surface group that is active at any time. Any surface type can be made active by right clicking on its name in the navigation tree and selecting the '''Activate''' item of the contextual menu. It is recommended that you first create surface groups, and then draw new objects under the active surface group. However, if you start a new [[EM.Illumina]] project from scratch, and start drawing a new object without having previously defined any surface groups, a new default PEC surface group is created and added to the navigation tree to hold your new CAD object.
[[Image:Info_icon.png|30px]] Click here to learn more about '''[[Building Geometrical Constructions in CubeCAD#Transferring Objects Among Different Groups or Modules | Moving Objects among Different Groups]]'''.
{{Note|In [[EM.Cube]], you can import external CAD models (such as STEP, IGES, STL models, etc.) only to [[CubeCAD]]. From [[CubeCAD]], you can then move the imported objects to [[EM.Illumina]].}}
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