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[[FileImage:FDTD2.png|thumb|left|250px|EM.Tempo's PEC Dialog]]
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[[FileImage:FDTD3.png|thumb|left|250px|EM.Tempo's PMC Dialog]]| valign="top"|[[Image:FDTD4.png|thumb|250px|Dielectric Material dialog]]| valign="top"|[[Image:FDTD6.png|thumb|250px|[[FDTD Module]]'s Anisotropic Material dialog]]| valign="top"|[[Image:FDTD8.png|thumb|250px|Debye Material Dialog]]
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You may also choose from a list of preloaded material types. Click the button labeled '''Material''' to open [[EM.Cube]]'s Material List dialog. Select the desired material from the list or type the first letter of a material to find it. For example, typing '''V''' selects '''Vacuum '''in the list. Once you close the dialog by clicking '''OK''', the selected material properties fill the parameter fields automatically.
{| border="0"|-| valign="top"|[[File:FDTD4.png|thumb|left|250px|Dielectric Material dialog]]| valign="top"|
[[File:FDTD5.png|thumb|left|350px|[[EM.Cube]]'s material list]]
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=== Anisotropic Materials ===
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[[Image:FDTD6.png|thumb|250px|[[FDTD Module]]'s Anisotropic Material dialog]]
[[EM.Tempo]] allows you to define a general anisotropic material, whose constitutive [[parameters]], i.e. permittivity ('''ε'''), permeability ('''μ'''), electrical conductivity ('''σ''') and magnetic conductivity ('''σ<sub>m</sub>'''), are all tensorial in nature. Each constitutive parameter in this case is represented by a 3Ã3 matrix:
where <math>\omega _p</math> and <math>\delta_p</math> are the angular resonant frequency and angular damping frequency corresponding to the p''th'' pole, respectively, and both are expressed in rad/s. Similar to a Debye material, <math>\Delta \varepsilon_p = \varepsilon_{sp} - \varepsilon_{\infty}</math> represents the change in permittivity due to the p''th'' pole.
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[[File:FDTD8.png|thumb|left|200px|Debye Material Dialog]]
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[[File:FDTD7.png|thumb|left|200px|Debye Add Pole Dialog]]
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===Geometrical Rules & Material Hierarchy===