The ceiling is always a polygon with zero thickness. Height is used to draw ceilings at this height for rooms at the current level, except at the topmost level, when the wall-height is used to calculate the ceiling height for rooms that are nearby. Walls from higher levels also reach below the elevation of their corresponding level with the assigned colors or textures visible. A room floor effectively becomes a polygon extruded below the surface with the given thickness. This thickness reaches below the elevation and is seen from lower levels with the color or texture that is used for the floor of the corresponding room when looking up from lower floors.
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