BIM Software Tip: How to Attach Arrows That Modify the Shape of Revit Family Components
In Revit, you can manually drag arrows along the edges of walls to adjust their height and width. However, you might notice that some custom families display these arrows, while others do not. Let’s first clarify what these arrows represent:
Why is it that only length and height parameters can be adjusted by dragging, whereas thickness cannot? This is because length and height are set as instance parameters, while thickness is a type parameter. Therefore, when creating your own families, the parameters must be defined as instance parameters. Additionally, the parameter needs to be associated with a reference plane that is not set as a “cost” reference.
To summarize, there are two essential requirements:
1. The parameter must be an instance parameter;
2. It must be linked to a non-cost reference plane;
For example:
If either of these conditions is not met, the adjustable arrows will not appear.
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