Datum Extents And Visibility; Example Of Datum Visibility In Project Views - Autodesk 256B1-05A761-1301 - AutoCAD Revit Structure Suite 2010 User Manual

Name
Defines Origin

Datum Extents and Visibility

Datum planes, such as those for levels, grids, and reference planes are not visible in all views. If the datum
does not intersect a view s plane (or does not intersect the plane in the correct way), then it will not be
visible in that view.
Datum planes are modifiable. You can resize their extents so that they are visible in some views, but not
others. You can also change datum extents in one view and then propagate that change to any desired
parallel views in which the datum is visible.
You can also use scope boxes to control visibility of datum.

Example of Datum Visibility in Project Views

When you resize model (3D) datum extents, you can control in which view they are visible. If the datum
planes do not intersect the view plane, they are not visible in the view.
In the following example, the top level line is not visible in the section view, because its model (3D) extents
do not intersect it.
In the next example, the grid is visible only in the first 2 plan views, because its model (3D) extents do not
intersect the third level line.
1108 | Chapter 18 Annotating and Detailing
Description
you create a door family with 24", 30", and 36" types. For each type, you specify a
reference plane as left. Then you place the new 24" door type in your project and
dimension it 5' from an exterior wall. Then you decide to replace that 24" door with
a 30" door. When you swap out the doors, Revit Architecture retains the 5' dimension.
The Is Reference names are arbitrary and are meant as a convenient method for
maintaining consistency across family types. For more information, including inform-
ation on strong and weak references, see
Specifies where the cursor rests on the object you are placing. For example, as you
place a rectangular column, the cursor rests at the centerline of the column shape.
The Families Guide on page 418.