Get Face Reference using Python

Developers
,
1

I am trying to get to the Reference object of a PlanarFace, using Python.

Underneath you can see the API object that I’m looking for: (a screenshot from RevitLookup addin):

image
image.png834×546 19.8 KB

I have gotten to the PlanarFaces using following code

doc = DocumentManager.Instance.CurrentDBDocument
element = UnwrapElement(IN[0])
options = Autodesk.Revit.DB.Options()

#get element geometry
geometryInstance = element.get_Geometry(options)

#get instance geometry
inst_geom = []
for i in geometryInstance:
inst_geom.append(i.GetInstanceGeometry())

#iterate to remove empty geometry objects
filtered = []
for i in inst_geom[0]:
if list((i.Faces)).Count != 0:
filtered.append(i)

#get faces of filtered geometry
faces = []
for i in filtered:
faces.append(i.Faces)

OUT = faces

image

This is where the problem starts.
From here I have tried 2 methods to get to the Reference object. Both fail.

Method 1: use face.Reference

#get face reference object
face_refs = []
for face in faces[0]:
face_refs.append(face.Reference)

OUT = face_refs

I get Nulls:

image

Method 2: use face.Tags.LookupTag(“RevitFaceReference”)

I did this once in another workflow:

image
image.png1632×500 67.3 KB

So I tried it also here, but failed.
It says PlanarFace has no attribute ‘Tags’

image
image.png1303×705 96.5 KB

Can someone help me get there?

2

Maybe try Revit Api’s Reference Array? Seems to work for me like that:

refArray = ReferenceArray()

refArray.Append(f.Reference)

3

Thanks for the suggestion. But I’m afraid I dont know how to use your method.

I just typed in exactly what you said, and Python doesnt get it (so do I :stuck_out_tongue:

image
image.png1221×679 66.1 KB

Could it be that I am missing a reference maybe? Im currently using these:

import clr
clr.AddReference(‘ProtoGeometry’)
from Autodesk.DesignScript.Geometry import *

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

clr.AddReference("RevitNodes")
import Revit
clr.ImportExtensions(Revit.Elements)
clr.ImportExtensions(Revit.GeometryConversion)

clr.AddReference("RevitAPI")
import Autodesk
clr.AddReference("System")
from System.Collections.Generic import *

4

If think it’s in:

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

5

Allright. At least adding reference from Autodesk.Revit.DB import * helped resolving the error ‘ReferenceArray is not defined’. Thanks for that.

I still get nulls though…

How did you do it? Any other thoughts?

image
image.png1170×588 55 KB

6

Got it.

“To get the reference of a face that is part of a solid, you need to set Option.ComputeReferences = true.”

Thanks to https://forums.autodesk.com/t5/revit-api-forum/how-to-get-the-face-reference/td-p/3949069

8 Likes
7

Tell me, did you manage to get reference from PlanarFace?