Your physical structure in EM.Tempo can be made up of several geometric objects with different material compositions. EM.Tempo groups your geometric objects in the project workspace based on their material type. All the objects belonging to the same material group share the same color and same material properties. EM.Tempo's material types are divided into seven categories:
* {| class="wikitable"|-! scope="col"| Material Type! scope="col"| Applications! scope="col"| Geometric Object Types|-| '''[[Glossary of EM.Cube's Materials & Physical Object Types#Perfect Electric Conductor (PEC) |Perfect Electric Conductor (PEC) Objects]]'''* | style="width:300px;" | Modeling perfect metal| style="width:250px;" | Solid, surface and curve objects|-| '''[[Glossary of EM.Cube's Materials & Physical Object Types#Thin Wire |Thin WiresWire]]'''* | style="width:300px;" | Modeling wire radiators| style="width:250px;" | Lines parallel to one of the three principal axes|-| '''[[Glossary of EM.Cube's Materials & Physical Object Types#Perfect Magnetic Conductor (PMC) |Perfect Magnetic Conductor (PMC) Planes]]'''* | style="width:300px;" | Modeling perfect magnetic sheets | style="width:250px;" | Rectangle strips parallel to one of the three principal planes|-| '''[[Glossary of EM.Cube's Materials & Physical Object Types#Dielectric Material |Dielectric MaterialsMaterial]]'''* | style="width:300px;" | Modeling any homogeneous material| style="width:250px;" | Solid objects|-| '''[[Glossary of EM.Cube's Materials & Physical Object Types#Anisotropic Material |Anisotropic MaterialsMaterial]]'''* | style="width:300px;" | Modeling unaxial or generalized anisotriopic materials| style="width:250px;" | Solid objects|-| '''[[Glossary of EM.Cube's Materials & Physical Object Types#Dispersive Material |Dispersive MaterialsMaterial]]'''* | style="width:300px;" | Modeling Debye, Drude and Lorentz materials and generalized metamaterials | style="width:250px;" | Solid objects|-| '''[[Glossary of EM.Cube's Materials & Physical Object Types#Voxel Database |Voxel Databases]]'''| style="width:300px;" | Modeling general inhomogeneous materials defined pointwise using a voxel database| style="width:250px;" | Must import ".CAR" type data file|}
Under each material node in the navigation tree, you can create new material groups of the same type but with different properties such as color, texture, or electric and magnetic constitutive parameters. These material groups are used to organize both the geometric objects you draw in the project workspace and those you import from external CAD model files.