IfcOpenShell, how to add a new property and value to an object?

glavoc

Hi,

@Moult said:
In IFC, attributes are fixed. If you want to add arbitrary properties, use property sets, not attributes. This is as @Coen has explained. However, there is a simpler method using the IfcOpenShell API.

import ifcopenshell
import ifcopenshell.api
ifc = ifcopenshell.open('path\to_your\ifc_file')
element = ifc.by_type("IfcElement")[0] # Just as an example, you will need to select the elements you want to add properties to yourself.
pset = ifcopenshell.api.run("pset.add_pset", ifc, product=element, name="Your Property Set Name")
ifcopenshell.api.run("pset.edit_pset", ifc, pset=pset, properties={"foo": "foobar", "foo2": "foobaz"})

this code is not working for me, I don't have much experience with ifc.

Im trying to assign parameters coming from excel file.

f = ifcopenshell.open(ifc_path)
df = pd.read_excel(xls_path), sheet_name="CONCRETE")
for index, row in df.iterrows():
    ifcguid = row['IfcGUID']
    el = f.by_id(ifcguid) 
    pset = ifcopenshell.api.run("pset.add_pset", f, product=el, name="Pset_AsBuilt")
    ifcopenshell.api.run("pset.edit_pset", f, pset=pset, properties=row)
f.write(ifc_path)

and it looks like they do get assigned to elements but they are not visible in bim viewer/blender.

this is ifc file after editing. for example:

#1069189=IFCPROPERTYSINGLEVALUE('Product Manufacture Name',$,IFCLABEL('40MPa Aquron'),$);
#1069176=IFCPROPERTYSET('1KvRowVMrEIfpEJA8$4jLm',#1069175,'Pset_AsBuilt',$,(#1069179,#1069180,#1069181,#1069182,#1069183,#1069184,#1069185,#1069186,#1069187,#1069188,#1069189,#1069190,#1069191));
#1069177=IFCOWNERHISTORY(#192,#188,.READWRITE.,.ADDED.,1686207125,#192,#188,1686207125);
#1069178=IFCRELDEFINESBYPROPERTIES('3S7ICTkE9BIBEDyYqYj8K7',#1069177,$,$,(#8997),#1069176);
#8997=IFCSLAB('0e3zm5Y85BhfXSflZpYTEV',#193,'Default Slab','1,..\\..\\..\\..\\.......................