Change project unit node

Revit
1

I’m trying to find a node/script that can change a documents unit type.

For example, changing the “distance” project units to imperial to metric:

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I’ve tried tutorial on Youtube but they don’t work with the new api.
Thank you very much!

2

I don’t think there is a node that will update units
Here is some python code that can

import clr

clr.AddReference("RevitServices")
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

clr.AddReference("RevitAPI")
from Autodesk.Revit.DB import *

doc = DocumentManager.Instance.CurrentDBDocument

units = doc.GetUnits()
length = SpecTypeId.Length
feet_fi = UnitTypeId.FeetFractionalInches

current = units.GetFormatOptions(length).GetUnitTypeId()

if current != feet_fi:
    units.SetFormatOptions(length, FormatOptions(feet_fi))

current = LabelUtils.GetLabelForUnit(current)

updated = LabelUtils.GetLabelForUnit(
    units.GetFormatOptions(length).GetUnitTypeId()
)

TransactionManager.Instance.EnsureInTransaction(doc)
doc.SetUnits(units)
TransactionManager.Instance.TransactionTaskDone()

OUT = current, updated
4

Hi,

another example with Distance and Length unit

import clr
import sys
import System

#import Revit API
clr.AddReference('RevitAPI')
import Autodesk
from Autodesk.Revit.DB import *
import Autodesk.Revit.DB as DB

#import transactionManager and DocumentManager (RevitServices is specific to Dynamo)
clr.AddReference('RevitServices')
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

doc = DocumentManager.Instance.CurrentDBDocument

def set_millimeter_Unit():
	TransactionManager.Instance.EnsureInTransaction(doc)
	unit = doc.GetUnits()
	format_opt = FormatOptions(Autodesk.Revit.DB.UnitTypeId.Millimeters)	
	format_opt.Accuracy = 1
	unit.SetFormatOptions(SpecTypeId.Distance, format_opt )
	unit.SetFormatOptions(SpecTypeId.Length, format_opt)
	doc.SetUnits(unit)
	TransactionManager.Instance.TransactionTaskDone()	
	
set_millimeter_Unit()