==Grid Settings & Mesh Generation==
EM.Cube’s [[FDTD Module]] generates a Yee mesh of your physical structure. The mesh properties can be accessed by clicking the <b>Mesh Settings</b> [[Image:fdtd_meshsettings.png]] button of the Simulate Toolbar (or using the keyboard shortcut <b>Ctrl+G</b> or via the menu <b>Simulate → Discretization → Mesh Settings</b>). For this tutorial, accept the default value of 20 Cells/λ<sub>eff</sub> for <b>Minimum Mesh Density</b>.