Tag: tolerances

There is a great video on View Range by Paul Aubin at the link below here: http://www.screencast.com/t/eCJaIgaevE

It is very well explained and I learned some things I had no idea about, like the ‘tolerances’ associated with various elements when using View Range. After using Revit for so long, I’m surprised this piece of important information had ‘slipped through’! I did some searching, and these tolerances are listed in the Revit online help at this link and hinted at in the support information here.

For your convenience, I have copied the information from the Revit help page below:
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 edge slabs 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
• 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 model. 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.

You can view Paul Aubin’s site at:
http://paulaubin.com/lrt/

I received the information about the screencast from Fear and Loathing in a CAD vs BIM World at http://cad-vs-bim.blogspot.com/2009/12/view-ranges-explained.html