how to Set Instance-Based Height Parameter for Wall Panel Family via pyRevit Script

[sHubamyadav016]

I’ve created a Revit wall panel family (.rfa) that includes an instance parameter named Height. The panel geometry is designed to flex based on the value of this parameter.

Now, I want to use a pyRevit script that performs the following:

1. Asks the user to input a custom height in millimeters.

2. Places an instance of the wall panel family at a picked point.

3. Sets the Height parameter of the instance dynamically to the user’s input.

I have confirmed that:

• The family is properly parameterized with an instance Height (Length) parameter.

• The panel flexes as expected when manually editing Height in the properties panel.

• The script should prompt for height (e.g., via forms.ask_for_string()).

• Convert the input to feet (Revit internal units).

• Place a family instance at a picked point.

• Set the Height instance parameter to the provided value.

I’ve written some basic script using FilteredElementCollector and NewFamilyInstance, but I’m unsure how to:

• Properly access and set the Height instance parameter

• Handle unit conversion

• Ensure family is activated if not already