* Under the [[#Perfect Conductors|PEC]] material category, you can also define [[Curve Objects|curve objects]] such as lines, polylines, etc. to model wire structures.
EM.Cube's [[FDTD Module]] allows overlapping objects, although it is generally recommended that object overlaps be avoided in favor of clearly defined geometries and object boundaries. If two or more objects of the same material type and group overlap, they are merged using the Boolean union operation during the mesh generation process.<font color="red"><u>''' Â If two overlapping objects belong to two different material categories, then the material properties of the FDTD cells in the overlap region will follow the [[FDTD Module]]'s material priority rule.'''</u></font> In that case, the overlap area cells will always be regarded as having the material type of the higher priority. According to this rule, the material types are ordered from the highest priority to the lowest in the following manner:
# [[#Perfect Conductors|PEC]]