Once a new material node has been created on the navigation tree, it becomes the "Active" material group of the project workspace, which is always listed in bold letters. When you draw a new geometric object such as a box or a sphere, its name is added under the currently active material type. There is only one material group that is active at any time. Any material 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 material groups, and then draw new objects under the active material group. However, if you start a new EM.Tempo project from scratch, and start drawing a new object without having previously defined any material groups, a new default PEC group is created and added to the navigation tree to hold your new object.
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[[Image:Info_icon.png|40px]] Click here to learn more about '''[[Defining_Materials_in_EM.Cube#Moving_Objects_among_Material_Groups | Moving Objects among Material Groups]]'''.
{{Note|You can import external objects only to CubeCAD. You can then move the imported objects form CubeCAD to EM.Tempo.}}
[[Image:Info_icon.png|40px]] Click here for a general discussion of to access the '''[[Defining Materials in Glossary of EM.Cube's Materials & Physical Object Types]]'''.
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[[Image:FDTD_MAN1.png|thumb|left|250px300px|EM.Tempo's navigation tree.]]
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