How Revit Uses Dimensioning to Control Relationships Between Model Objects
In Revit, dimensions are directly linked to the model objects they annotate. When an object is deleted, any associated dimensions are removed as well. The dimension annotation reflects the actual size of the object it references. If the object’s size changes, the dimension value updates automatically.
Conversely, you can modify the values of dimension annotations to drive changes in the size of the annotated objects. This means dimensions can be used as a tool to control the spatial relationships between objects. Here’s how it works.
For example, consider the interior wall highlighted in blue in the image below. When you select this wall, a temporary blue dimension appears beneath it, and the permanent dimension above also turns blue.
At this point, clicking on the number in either the temporary or permanent dimension allows you to edit its value. After changing the permanent dimension’s value, the wall automatically moves to the new position as driven by the dimension.
Select the dimension, click the lock icon to fix it, and maintain the relative size between objects.
Dimension annotations also enable you to evenly space doors and windows. After marking the openings and the centerlines of doors and windows, click the “EQ” symbol above the dimension, as shown below. This evenly distributes the doors and windows according to the openings.
With this setup, no matter how the openings are adjusted, the doors and windows will always remain evenly spaced, as illustrated.
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