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IFCImportOptions.AutoJoin

Property
Description:
Enable or disable auto-join at the end of import.
Remarks:
Enabling auto-join will join appropriate elements (e.g., walls, columns), but will take extra time and may fail. Disabling auto-join will allow some imports that otherwise fail. Default is true for Open IFC; it is ignored (and false) for Link IFC.
Syntax
public bool AutoJoin { get; set; }