IFC Global Unique Identifier Attribute (GlobalId)

Keep ARCHICAD IFC ID: IFC GlobalId Attributes of elements (assigned automatically by ARCHICAD) will be retained in the exported IFC model.

The “Keep ARCHICAD IFC ID” option is useful when using other programs to compare two IFC model versions arriving from ARCHICAD.

This option is recommended when comparing two IFC models in ARCHICAD: see Detect IFC Model Changes.

This option is recommended for the BCF workflow, in which the roundtrip data exchange identifies model elements using their GlobalId Attributes: see Export/Import Markup Using BIM Collaboration Format (BCF).

Generate new values: Each new exported IFC file will generate brand new GlobalIds for the elements, so that each new exported version is entirely separate from the previous versions.

Note: This option has no effect on the Merge to IFC Model export process.

See also How to Control Global ID (IFC Attribute) Based on ARCHICAD Project Info.

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