[IfcOpenShell] Get Pset

C by Coen on 17 Feb 2023, edited 28 Feb 2023 # +1 votes

Is there a way with the ifcopenshell.api to get all occurences of all Pset_*Commons?

For example, I want to get the Pset_WallCommon, Pset_WindowCommon, Pset_CoveringCommon, etc

Or is there a way to retrieve these from an .ifc file using ifcopenshell with python?

C by Coen on 17 Feb 2023 #

I did it like this, but I don't have the feeling this is fool proof:


    if ifc_product:

        if ifc_product.IsDefinedBy:

            for ifc_reldefinesbyproperties in ifc_product.IsDefinedBy:

                if ifc_reldefinesbyproperties.is_a() == 'IfcRelDefinesByProperties':

                    if ifc_reldefinesbyproperties.RelatingPropertyDefinition.is_a() == 'IfcPropertySet':

                        if (ifc_reldefinesbyproperties.RelatingPropertyDefinition.Name).startswith('Pset_') and (ifc_reldefinesbyproperties.RelatingPropertyDefinition.Name).endswith('Common'):

                            for ifc_property in ifc_reldefinesbyproperties.RelatingPropertyDefinition.HasProperties:



                                if ifc_property.Name == property_name:

                                    if ifc_property.NominalValue:

                                        property_set_common_list.append(ifc_property.NominalValue[0])

I know with ifcopenshell it's way easier to use this:


netside_area = ifcopenshell.util.element.get_pset(ifc_product, "Pset_WallCommon","IsExternal")

I could also construct a list with IFC products and string contentacate them with Pset_ and Common?

C by Coen on 17 Feb 2023 # +2 votes

Came up with this eventually, just posting it here in case someone has a better idea:


for product in products:

        if product:

            ifc_pset_common = 'Pset_' +  (str(product.is_a()).replace('Ifc','')) + 'Common'

            ifcopenshell.util.element.get_pset(ifc_product=product,ifc_pset_common,'IsExternal')

C by ChubbyQuark on 18 Feb 2023, edited 18 Feb 2023 # +1 votes

Had a similar conversation over at github. Good to know. Could this be used as part of the section tool for model wide selections by Status (phase)?

https://github.com/IfcOpenShell/IfcOpenShell/issues/2741#issuecomment-1426955540

C by Coen on 23 Feb 2023 #

@Coen said:

Came up with this eventually, just posting it here in case someone has a better idea:

for product in products:

    if product:

        ifc_pset_common = 'Pset_' +  (str(product.is_a()).replace('Ifc','')) + 'Common'

        ifcopenshell.util.element.get_pset(ifc_product=product,ifc_pset_common,'IsExternal')

Coming back from this, this is actually a really stupid method, it creates psets which don't exist

for example:


0     20FpTZCqJy2vhVJYtjuIce              IfcSite          Site  ...                             None              Pset_SiteCommon       None

1     00tMo7QcxqWdIGvc4sMN2A          IfcBuilding      Building  ...                             None          Pset_BuildingCommon       None

2     1Q6PG1Po9C5hoyWBnJmRby    IfcBuildingStorey  -1 fundering  ...                             None    Pset_BuildingStoreyCommon       None

3     1nOs6Hg0v9fR$sLR1LjIyX  IfcWallStandardCase  opgaand werk  ...  03 Metselwerk - kalkzandsteen C  Pset_WallStandardCaseCommon       None

4     3vSAOyJwTEhQMEIJ6D9qRY              IfcBeam   liftputwand  ...          02 Beton gewapend - ihw              Pset_BeamCommon       True

...                      ...                  ...           ...  ...                              ...                          ...        ...

3817  3Olk_mPe65E0KtHIPy$_$1    IfcVirtualElement          None  ...                             None    Pset_VirtualElementCommon       None

3818  1KjO$vvpVoZVVv2TkgMMiV    IfcVirtualElement          None  ...                             None    Pset_VirtualElementCommon       None

3819  0AqwAKlfR7PF2iHZiwYgaj    IfcVirtualElement          None  ...                             None    Pset_VirtualElementCommon       None

3820  0YshRU0dY_pqHrelMDKS95    IfcVirtualElement          None  ...                             None    Pset_VirtualElementCommon       None

3821  1SVMTA56aioBMVjIKpDrkY    IfcVirtualElement          None  ...                             None    Pset_VirtualElementCommon       None

C by chachi_ws on 28 Feb 2023 #

Can't you use a regular expression, because the propertyset name always starts with 'Pset_' and ends with 'Common'?

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[IfcOpenShell] Get Pset_*Common