Get Exterior Faces Of Walls From Linked File

Revit
1

Hi, guys I ran into the issue with HostObjectUtils.GetSideFaces, it’s works well if element is not linked as you can see in picture below

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import clr
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *
clr.AddReference('RevitAPI')
import Autodesk
from Autodesk.Revit.DB import *
import Autodesk.Revit.DB as DB
clr.AddReference('RevitServices')
import RevitServices
from RevitServices.Persistence import DocumentManager
clr.AddReference('RevitNodes')
import Revit
clr.ImportExtensions(Revit.GeometryConversion)

doc = DocumentManager.Instance.CurrentDBDocument


surfaces = []
walls = FilteredElementCollector(doc).OfCategory(BuiltInCategory.OST_Walls).WhereElementIsNotElementType().ToElements()
for wall in walls:
    side_face = HostObjectUtils.GetSideFaces(wall, ShellLayerType.Exterior)[0]
    surface = wall.GetGeometryObjectFromReference(side_face).ToProtoType()[0]
    surfaces.append(surface)


OUT = surfaces

But when I tried to feed linked wall elements the error is raising. Do you have any suggestions or where I can learn how to avoid that error? Thank you all in advance

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image747×592 68 KB

That’s snippet of code below to obtain walls from link

import clr
clr.AddReference("RevitServices")
import RevitServices
from RevitServices.Persistence import DocumentManager
clr.AddReference("RevitAPI")
import Autodesk
from Autodesk.Revit.DB import *
import System
import sys
pyt_path = r'C:\Program Files (x86)\IronPython 2.7\Lib'
sys.path.append(pyt_path)


doc = DocumentManager.Instance.CurrentDBDocument
links = FilteredElementCollector(doc).OfClass(RevitLinkInstance)


link_docs = [link.GetLinkDocument() for link in links]

category = IN[0]
error_reports = []
result = []

for link_doc in link_docs:
    try:
    	errorReport = None
    	result += FilteredElementCollector(link_doc).OfClass(Wall)
    except:
    	import traceback
    	error_report = traceback.format_exc()
    	error_reports.append(error_report)

if len(error_reports) == 0:
	OUT = result
else:
	OUT = error_reports

And after code pretty much the same with the exception of input for walls

walls = IN[0]
surfaces = []
for wall in walls:
    side_face = HostObjectUtils.GetSideFaces(wall, ShellLayerType.Exterior)[0]
    surface = wall.GetGeometryObjectFromReference(side_face).ToProtoType()[0]
    surfaces.append(surface)

OUT = surfaces
2

Not at the PC to check, but I recall that as the walls aren’t in the document they aren’t actually wall objects in the API, but instead LinkElement objects. If you merge the two Python blocks into one I believe you should be able to progress as intended though as you’re collecting wall elements in the ‘get walls from link’ Python.

3

another way maybe could be genius loci compound surface reference…it give you the surfaces exterior/interiør as well and should work on link

1 Like
4

Hi,

you need to Unwrap the input elements to expose them to the Revit API

walls = UnwrapElement(IN[0])

1 Like
5

Thank you so much, it worked :sunglasses: