Metric Tutorials - Autodesk

Notice the new text appears below the supplemental text.
51 On the Design Bar, click Modify.
52 Click File menu ➤ Save As, and save the model to a location of your choice using the following
file name: m_RST_Dimensioning-in progress.rvt.
53 Proceed to the next exercise, Controlling Witness Line Location on page 376.
Controlling Witness Line Location
In this exercise, you learn to add, delete, and change the origin of dimension witness lines. When you place
dimensions, you specify their origin on the Options Bar. However, in some cases, you may need to override
their settings on an instance basis. For example, for a multi-segmented dimension, you may want to locate
the 2 outermost witness lines on the exterior face of each wall, whereas the witness lines referring to interior
walls would be located on the centerline of each wall.
Training File
Continue to use the training file you used in the previous exercise, m_RST_Dimensioning-in progress.rvt
Override dimension defaults
1 Delete the multi-segmented vertical dimension that you placed along the left side of the building
model in the previous exercise.
2 On the Basics tab of the Design Bar, click Dimension.
3 On the Options Bar, verify that Wall faces is selected for Prefer.
4 Move the cursor over the north wall of the North Building, but do not select anything.
5 Alternate the cursor position over the inner and outer wall face.
Notice that only the wall faces highlight when you move the cursor over them, because the
Prefer wall faces option is selected instead of the Prefer wall centerline option.
6 Position the cursor over the wall, and press TAB repeatedly.
Each time you press TAB, a different wall selection choice highlights, including the wall centerline.
7 When the exterior face of the wall highlights, select it.
8 Move the cursor over the south wall of the North Building, press TAB until the wall centerline
highlights, and select it.
9 Move the cursor to the top horizontal wall of the South Building, and select the exterior face.
10 Move the cursor to the south wall of the South Building, and select the exterior face.
11 Place the dimension as shown.
376 | Chapter 11 Annotating and Dimensioning