[[Image:FDTD28.png|thumb|350px|The adaptive FDTD meshes of a metallic sphere.]]
[[Image:FDTD34.png|thumb|350px|A human head model and a cellular phone handset on its side.]]
[[Image:FDTD33.png|thumb|350px|The FDTD mesh of the human head model and the cellular phone handset.]]
[[EM.Tempo]]'s FDTD mesh is a rectangular Yee mesh that extends to the entire computational domain. It is primarily constructed from three mesh grid profiles along the XY, YZ and ZX principal planes. These projections together create a 3D rectangular (voxel) mesh space. Straight lines, boxes and rectangular plates whose edges are aligned with the three principal axes are the simplest objects to mesh in EM.Tempo. Such objects preserve their exact shapes after discretization. All the objects with curved edges and curved surfaces or objects with straight edges and flat faces that are not parallel to the principal axes or principal planes (such as oblique lines and slanted lateral faces of a pyramid) are discretized using a staircase (Yee) profile.
{{Note|When choosing a mesh type for your FDTD simulation, keep in mind that adaptive and regular mesh types are frequency-dependent and their density varies with the highest frequency of your specified bandwidth, while the uniform mesh type is always fixed and independent of your project's frequency settings.}}
[[Image:FDTD34.png|thumb|400px|A human head model and a cellular phone handset on its side.]]
[[Image:FDTD33.png|thumb|400px|The FDTD mesh of the human head model and the cellular phone handset.]]
===Viewing the FDTD Mesh===