INQ: IFC custom Predefined type

[Mairh93]

Inquiry description

In Revit 2023 how is it possible to export in IFC a custom predefined type ?

For example for a stair I want the IFC Class : IfcStairType.THREE_STRAIGHT_RUN_STAIR (that not exist in the current list here https://ifc43-docs.standards.buildingsmart.org/IFC/RELEASE/IFC4x3/HTML/lexical/IfcStairTypeEnum.htm )

I already tried to use the parametwers IFCExportAs and IFCExportType, but it is doent work.

Thank you in advace!

Revit Version

2023.1.x

IFC for Revit Addon Version

24.x.x

Windows Version

11 22H2

[LFaiss]

Hi, Im afraid I have no solution for your issue, but I have a similar problem.

I want to export one Stair as IfcStair.NOTDEFINED in Revit 2024

But if I use the "export in IFC as" and the "Predefinded Type" Parameter in Revit it wont export to ifc correctly. It's always IfcStair.STRAIGHT_RUN_STAIR instead of IfcStair.NOTDEFINED

[andydandy74]

• Set the Type IFC Predefined Type parameter (formerly known as IfcExportType) to USERDEFINED.
• Then add an additional type parameter IfcElementType and set that to the name of your custom type.
• Works the same way for instances but your custom type name would need to go into an instance parameter called IfcObjectType instead.