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Objects must be dimensionally accurate in the single IFC model because it is
shared by diverse applications.
For information about other methods of sharing drawings with external users,
see Sharing Drawings with AutoCAD Users on page 211.
General Information for Exporting Drawing Files to IFC
Only a currently active drawing can be exported to IFC. The export process
generates 2 files:
â– An IFC file that contains information specified for project number and
name, file path, and external references (xrefs).
â– A LOG file that contains data about information (objects and geographic
location) in the drawing. This file is stored in the same location as the IFC
file.
The current display configuration for the drawing being exported is what
defines the graphical information and geometry for the IFC file. Objects that
would typically display in the current display configuration are exported
regardless of whether their layers are frozen or turned off. For more
information, see Display Representations on page 789.
You can export a property set as an IfcElementQuantity if an object with a
property set definition has a suffix of IfcElementQuantity. The property set
definition must also include at least one property name with a value, such as
IfcQuantityArea, IfcQuantityCount, or IfcQuantityLength. This information
displays on the Extended Data tab of the Properties palette. For more
information, see Property Sets and Property Set Definitions on page 3705.
You can use the IfcBaseProperty property set to specify the name and object
type for each IFC entity exported. This information is also preserved in the
same property set when importing an IFC file.
Spaces and their boundaries must be set to Associative if you want to export
space boundary information. When there is a virtual boundary—a boundary
between spaces or a space with nothing in it—draw a line along the expected
boundary, and set Bound spaces as Yes. This space will be exported as a Virtual
space boundary in IFC. For more information, see Making a Space Associative
or Non-Associative on page 2936.
A value must be specified in the Geographic Location dialog if you want to
export to true North. For more information, see View the Geographic Location
Information in the AutoCAD Help.
220 | Chapter 5 Interoperability with Other Applications
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