Place Families using RevitLink elements as Host

Revit
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1

Hi All, I want to place an Air Terminal in a Mechanical Project using a wall placed in a Revit Link as Host with Dynamo.

I tried using “FamilyInstance.ByFace” node but this node returns to me an error: “Reference from different document”. I also tried using RevitAPI and “NewFamilyInstance” methods but the script returns the same error.

Is there a method in RevitAPI or a node in dynamo that allows me to complete this task?

Thanks for the support!

2

What file type is it that youre linking in?

3

Can you do it in Revit UI without Copy/Monitor thing?

4

Hi, I link an Architectural model, and I want RevitLinkInstance as Family Host. The Air terminal needs to have RevitLInkInstance as Host, in particular a ceiling in the linked Architectural model, in order to update his position if the ceiling moves.

5

Hi, I could change Host in Revit selecting another element, but I want to automate the creation of Air Terminals placing them in a specific location of a Space, so I need a script that creates family Instances with the correct Host in order to not change the Host of all the instances created manually

6

ok, so it seems possible…but not entirely trivial

Check the script below. You have to make three inputs for the python node - [0] element type/family symbol, [1] list of your ceilings from the linked model, [2] revit link instance element.
This script places a family instance on the center (more less) of the bottom face of the ceiling.

import clr

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

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

def parseLinkedReference(doc, linkedRef):
	reps = linkedRef.ConvertToStableRepresentation(doc).split(':')			
	res = ''
	first=True				
			
	for i, s in enumerate(reps):
		t = s
		if "RVTLINK" in s:
			if(i<len(reps)-1):
				if reps[i+1]=="0":
					t = "RVTLINK"
				else:
					t = "0:RVTLINK"
			else:
				t = "0:RVTLINK"
		if not first:
			res = res + ":" + t
		else:
			res = t
			first = False
						
	ref = Reference.ParseFromStableRepresentation(doc,res)
	
	return ref


doc = DocumentManager.Instance.CurrentDBDocument
family_type = UnwrapElement(IN[0])
hosts = UnwrapElement(IN[1])
linked_instance = UnwrapElement(IN[2])
output = []

TransactionManager.Instance.EnsureInTransaction(doc)

for h in hosts:
	reference = HostObjectUtils.GetBottomFaces(h)[0]
	linked_reference = reference.CreateLinkReference(linked_instance)
			
	parsed_ref = parseLinkedReference(doc,linked_reference)
	face = h.GetGeometryObjectFromReference(reference)
	bb = face.GetBoundingBox()
	centerUV = bb.Min + (bb.Max-bb.Min)/2
	p = face.Evaluate(centerUV)

	inst = doc.Create.NewFamilyInstance(parsed_ref,p,XYZ(0,0,0),family_type)
	output.append(inst)
	
TransactionManager.Instance.TransactionTaskDone()

#Assign your output to the OUT variable.
OUT = output
4 Likes
7

It works perfectly!!! Thank you very much!:slight_smile: