Door/Window Areas

[PhillipM]

HI guys.

I'm needing to know the cut area's of windows and doors in a wall. I thought this would be a simple matter of grabbing the BIP "HOST_Area_Computed" as with my testing that was returning the correct area.  It turns out that this is not the case from further testing.

PLease refer to the attached RVT file with two doors inserted into a wall.  They look similar but one is reporting through Revit Lookup 4m2 and the other 2m2.

Why is this?  What actually is "HOST_Area_Computed" reporting?  and what is the most reliable way of getting the cut area of windows and doors?

Regards

Phillip Miller

[office]

jeremy, thanks for your reply!

my solution went like:

for i in openingIds:
				try:
					bounding, orient = I.ExporterIFCUtils.GetInstanceCutoutFromWall(doc, element, doc.GetElement(i),)
					print "success"
				except:
					
					print (" failed for wall %s and opening %s" %(element.Id, i))

cheers peter

[jeremytammik]

Dear Peter,

Thank you for sharing that.

I summarised your solution on The Building Coder, and also point out a generic link with a similar answer:

http://thebuildingcoder.typepad.com/blog/2016/07/retrieving-a-c-out-argument-value-in-python.html#2

Cheers,

Jeremy

[Anonymous]

Hi Peter,

I am trying to implement your solution in a Dynamo Python node but it fails with "AttributeError: attribute 'ExporterIFCUtils' of 'namespace#' object is read-only" which I think means I am not using the reference to IFCUtils properly... but I am not sure of that.

Can you show how you import Autodesk.Revit.DB.IFC to use it with python?

Also, are you coding for Dynamo or using the revit python shell within Revit?

Thanks

[office]

for the import:

from Autodesk.Revit.DB.IFC import *
I = Autodesk.Revit.DB.IFC

and later:

doc =  __revit__.ActiveUIDocument.Document

#element = wall element collected with filter

orient = element.Orientation

bounding, orient = I.ExporterIFCUtils.GetInstanceCutoutFromWall(doc, element, doc.GetElement(i),)

#-----------------

best peter

[Anonymous]

Thanks for the quick response, Peter.

I cannot make it work at all. whenever I assign "I":

from Autodesk.Revit.DB.IFC import *
I = Autodesk.Revit.DB.IFC

Revit Python shell crashes. Have tried with Macros and same result...

I must be missing something somewhere but am clueless now... But If I can't get past loading IFC to use IFCUtils I don't see how to make it work.

Thanks again!

Ivan

[office]

import clr
import math
clr.AddReference('RevitAPI') 
clr.AddReference('RevitAPIUI') 
clr.AddReference('REVITAPIIFC')
from Autodesk.Revit.DB import * 
import Autodesk
from Autodesk.Revit.DB import *
from System.Collections.Generic import *
from Autodesk.Revit.DB.IFC import *
I = Autodesk.Revit.DB.IFC

uidoc = __revit__.ActiveUIDocument
doc = __revit__.ActiveUIDocument.Document
app = __revit__.Application

cl = FilteredElementCollector(doc)
elements = cl.OfCategory( BuiltInCategory.OST_Walls ).WhereElementIsNotElementType().ToElements()
t= Transaction(doc,"netground")
t.Start()
for element in elements:
	orient = element.Orientation
	openingIds=element.FindInserts(True,True,True,True)
	if openingIds.Count >0:
		for i in openingIds:
			opening = doc.GetElement(i)
			try:
				bounding, orient = I.ExporterIFCUtils.GetInstanceCutoutFromWall(doc, element, opening,)
				loops = List[CurveLoop]()
				loops.Add(bounding)
				area = I.ExporterIFCUtils.ComputeAreaOfCurveLoops(loops)
				print (area)
			except:
				pass
t.Commit()

this code is working on my side.

i am using pyRevit as python enviroment.

https://github.com/eirannejad/pyRevit

i suppose the problem might be to set the paths for python libraries correctly when in python shell

[Anonymous]

Solved!. To be able to use IFCUtils from a python node in Dynamo I changed your code like this:

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

uidoc = DocumentManager.Instance.CurrentUIApplication
doc = DocumentManager.Instance.CurrentDBDocument
app = uidoc.Application

Now it properly loads the references from the API and it works. This is probably trivial but beeing a rookie took me a bit to figure out.

Thanks for your help Kop!.

[Anonymous]

BTW, the areas are reported in sq feet... conversion is needed for metric system.

[office]

To clarify: 

1) I am working with the python shell, so no Dynamo specific coding is implemented in the sample.

2) of course all units returned from revit are not metric. conversion will always be necessary for Non US 😉 users.

best peter

[office]

To clarify: 

1) I am working with the python shell, so no Dynamo specific coding is implemented in the sample.

2) of course all units returned from revit are not metric. conversion will always be necessary for Non US users which is appx. 80% of the revit users as I guess?

best peter