• Revit

Working with Equality Dimensions

Equalize and constrain dimensioned model elements.


Step-by-step guide

To use the Equality Dimension controls and set the display dimensions for equality conditions in your projects:

  1. Select a multi segment dimension string.

An “EQ” symbol is displayed with a line through it:

A multi-view of a Revit project in which the spacing of the windows on the second floor are being controlled by equality dimensions, which are highlighted after being selected in the drawing view.

  1. Click the EQ symbol to unlock it and equalize and constrain the model elements that are dimensioned.

A multi-view of a Revit project in which the equality dimensions symbol, EQ, has been selected in the drawing view and now shows as being unlocked.

  1. Move one of the elements, and the equality condition is maintained:

A dual image of the Revit drawing. On the left, the dimension is being dragged upward to move it. On the right, the dimensions remain equal after it has been moved.

The value that is displayed by the dimension string is defined by the instance and type properties of the dimension string. The string can be set to display the actual dimension value, a pre-defined text value, or a formula describing the condition. For example, a formula might be set to read, “6 @ 1700mm.”

The Properties palette open to the instance and type properties of the dimension string, where the Equality Display was changed to Value and in the drawing, it shows as “1732” instead of as “Equal.”

To change the text or formula value:

  1. Select the dimension string.
  2. In the Properties palette, click Edit Type.
  3. In the Type Properties dialog, under Other, define the value for the equality text. For example, the text value can be set to read “EQ” rather than “equal”.

The Type Properties dialog box, in which the Equality Text has been changed to “EQ”, which is highlighted in the drawing as having changed.

To control what is displayed when the string is set to use the equality formula:

  1. Adjacent to Equality Formula, click Quantity
  2. In the Dimension Equality Formula dialog, use the Add and Remove controls to add dimension parameters to the formula.
  3. Prefix and suffix characters can be added here as well.

In this example, the formula will read the number of segments, the length of each segment, and the total length.

The Dimension Equality Formula open in the foreground, with the Add, Remove, Prefix and Suffix tools highlighted for building the dimension text. In the background, the Type Properties dialog is still open, with the Quantity button highlighted.

Note: The witness lines can also be controlled. In this case, since the formula includes the total length, the internal witness lines and tick marks will be suppressed.

The final dimension string shown as a formula that was built in the Dimension Equality Formula dialog, shown in the drawing with the seven equally spaced windows across the second floor.