'''The most important rule of object connections in EM.Cube's [[Planar Module]] is that only objects belonging to the same trace can be connected to one another.''' For example, if two objects reside on the same Z-plane and geometrically have a common edge which you can clearly see in the project workspace, but organizationally they belong to two different metal traces, then the bridge basis functions will not be generated between them, and the simulation engine will see them disconnected. If two objects belong to the same trace and have a common overlap area, EM.Cube first merges the two objects using the "Boolean Union" operation and converts them into a single object for the purpose of meshing. The mesh of "unioned" areas is usually made up of triangular cells. If two objects reside on the same Z-plane and geometrically overlap with each other but organizationally belong to two different trace groups, incongruous, overlapped cells will be generated that will either blow up the linear system or produce completely wrong simulation results.
[[File:PMOM36.png|250px]] [[File:PMOM38.png|250px]] [[File:PMOM37.png|250px]]
Figure 1: Two overlapping planar objects and their triangular and hybrid planar meshes.
* Rectangular objects that contain gap source or lumped elements, always have a rectangular mesh around the gap area.
[[File:PMOM33.png|250px]] [[File:PMOM35.png|250px]] [[File:PMOM34.png|250px]]
Figure 2: Edge-connected rectangular planar objects and their triangular and hybrid planar meshes.