Here is an except from a revit guide regarding additional view range rules.
■ Model elements located outside of the view range generally are not shown in the view. The exceptions
are floors, stairs, ramps, and components that stay or are mounted on the floor (like furniture). These
are shown even when slightly below the view range. In addition, fascia, gutters, and slab edges are shown
when their bottoms are within a tolerance of the primary view range bottom.
Floors located outside the view range use an adjusted range that is 4 feet (approximately 1.22 meters)
below the bottom of the primary range. Floors are drawn with the Beyond line style if the floor exists
within this adjusted range.
■ Elements that are strictly below the cut plane, but are at least partially within the view range, are shown
as viewed from above. Components display according to Family Element Visibility Settings for Plan/RCP.
See Managing Family Visibility and Detail Level on page 1708
■ Walls shorter than 6 feet (approximately 1.83 meters) are not cut, even if they intersect the cut plane.
The 6 feet are measured from the top of the bounding box to the bottom of the primary view range. For
example, if you create a wall with a sloped top face, when the top of the wall is 6 feet away from the
bottom of the primary view range, the wall is cut at the cut plane. When the top of the wall is less than
6 feet, the entire wall shows as projection even where it intersects the cut plane. This behavior always
occurs when the Top Constraint property for the wall is specified as Unconnected.
■ There are a few categories for which an element located above the cut plane but partially below the top
clip is shown in plan. These categories include windows, casework, and generic models. These objects
are shown as viewed from above.
■ Visibility in RCP views is similar to plan views with the exception that objects are presented as viewed
from below and mirrored.