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=== Adjusting Block Elevation On Terrain ===
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In [[EM.Cube]], buildings and all other CAD objects are initially created on the XY plane by default. In other words, the Z-coordinate of the local coordinate system (LCS) of all blocks is set to zero until you change them. As long as you use the global ground, all is fine as your buildings are seated on the ground. When your propagation scene has an irregular terrain, you want to place your buildings on the terrain and not buried under it. Buildings in [[EM.Cube]] are not adjusted to the terrain elevation automatically. You need to instruct [[EM.Cube]] to do so.
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To update the building positions and adjust their elevation to the underlying terrain, right click on the '''Terrain''' item of the Navigation Tree and select '''Adjust Scene Elevation''' from the context menu. All the blocks in the scene are automatically elevated in the Z direction such that their bases sit on the terrain. In effect, all the blocks are translated along the global Z axis by proper amounts such that their local Z coordinate equals the Z-elevation of the underlying terrain object. This feature is particularly useful if you change the location of the terrain or import a new terrain after the blocks have been created.
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Note: You have to make sure that the resolution of your terrain, its fluctuation scale and building dimensions are all comparable. Otherwise, on a high-resolution, rapidly varying terrain, you will have buildings whose bottoms are in contact with the terrain only at a few points and parts of them hang in the air.
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[[File:prop_adjust1_tn.png|400px]] [[File:prop_adjust2_tn.png|400px]]
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Figure: A Scene with Buildings and Terrain Before and After Adjusting Elevation
=== Transmitters & Receivers Above An Irregular Terrain ===