The excellent and open-source IFC extension for Revit (previously known as IFC Exporter) has been updated. Please see below for download links and update details.

Download links:
16.6 for Revit 2016

17.3 for Revit 2017

Readme details for the latest release:

General:

– Minor improvements to the Importer class to make it easier for developers to create a custom Importer.
– We now support the IFC4 Addendum 2 schema.  Specific improvements based on that will be listed below.  For this update, you will have to manually add the IFC4_Add2.exp file (included with this package), to the EDM subfolder of your Revit Program folder.  We will automate this in a future update.

New Export Functionality:

– Allow overriding material names on export by using IfcName shared parameter.
– Expand the use of types for many elements that didn’t export types before, including beams (IfcBeamType), curtain walls (IfcCurtainWallType, and types for mullions and panels), and footings (IfcFootingType).
– Improved ability to export some geometry as IfcSweptSolid.
– Try to use axis information, if it exists, when exporting beams and members in addition to columns.
– (IFC4) Better support beam, column, and member base quantities, including weight.
– (IFC4) Collect material information for profiles for beams and columns.
– (IFC4) Expand use of FootPrint representations to columns and slabs.
– (IFC4) Expand use of IfcMaterialLayerSetUsage if the entity has a compound structure in Revit, as allowed by IFC.
– (IFC4) No longer create StandardCase IFC entities, as these have been deprecated (including IfcWallStandardCase).
– (IFC4) Support IfcMaterialConstituent and IfcMaterialProfileSet for a number of elements.
– (IFC4) Use Built-in parameter “Structural_Bend_Dir_Angle” to get “Roll” property for PSet_BeamCommon and PSet_ColumnCommon.
– (IFCAdd2) Support IfcPolygonalFaceSet.

Export Bug Fixes:
– Allow exporting to IFC while using Collaboration for Revit where the default directory isn’t local.
– Better support for MEP type entities, that didn’t always export correctly.
– Correct the parameters of the directrix of some IfcSweptSolids.
– Fix correct mapping of IfcBurnerType/IfcGasTerminalType and IfcElectricHeaterType/IfcSpaceHeaterType.
– Fix creation of types for sub-entities of IfcDistributionControlElement.
– Fix offset problem when using the “Export Linked Files as Separate IFCs” option in locales where the decimal mark is not a point.
– (IFC4) Correct names of IFC4 entity quantity sets.
– (IFC4) Fix the name of IfcCommunicationsApplianceType.

New Import Functionality:

– Add support for IfcDerivedProfileDef.
– Support IfcRelClassification.
– (IFC4) Support IfcMaterialProfile, IfcMaterialProfileSet, and IfcMaterialProfileSetUsage.
– (IFC4) Support IfcMaterialConstituent and IfcMaterialConstituentSet.
– (IFC4) Support IfcTessellatedFaceSet and IfcPolygonalFaceSet.
– (IFC4) Improve mapping from Roll parameter to structural bend direction angle.
– (API only) Allow for two new options, CreateDuplicateZoneGeometry and CreateDuplicateContainerGeometry, that disable the duplication of geometry for zone elements and containers, respectively.

Import Bug Fixes:
– Better reporting when importing an IFC file with invalid rectangular or circular profiles (e.g., a 0 radius profile).
– Don’t show the void geometry when subtracting a void from an empty solid as a result of an IfcBooleanResult calculation.
– Ensure that IFC2x schema files can still be imported.
– Fix import of some IfcSurfaceCurveSweptAreaSolids.

IFC for Revit 2015 (v15.7):
http://apps.exchange.autodesk.com/RVT/en/Detail/Index?id=appstore.exchange.autodesk.com%3aifc2015_windows32and64%3aen

IFC for Revit 2016 (v16.4):
http://apps.exchange.autodesk.com/RVT/en/Detail/Index?id=appstore.exchange.autodesk.com%3aifc2016_windows32and64%3aen

Details:
New Export Functionality:
Append “(Type)” to all internal Revit type property sets, to avoid having multiple property sets with the same name assigned to the same IFC entity.
Changed how the classification code is parsed so that classifications can have brackets and colons in them.
“Extra Low” level of detail now applies to all faceted BRep geometry, allowing many more files to export without hitting the size limit.
If a userdefined property set contains the same property name more than once, take the last nonempty value (don’t duplicate the property name).
Rebar elements can generate up to 1024 consistent GUIDs for individual IfcReinforcementBars, up from 256.
(IFC4) Zones can now have a long name, set by the “ZoneLongName” shared parameter for nonMEP zones, and the “IfcLongName” parameter for MEP zones.

Export Bug Fixes:
Don’t create orphaned IfcStyledItems.
Don’t export invisible geometry in beams.
Export DirectShapes of Walls category.
Export elements with empty custom classification field values.
Floors exported as IfcSlabs correctly report if they are load bearing or not, using either the “LoadBearing” shared parameter or the Structural builtin parameter, in that order.
Improve performance in certain cases where we can’t create a valid tessellation for a face.
The “Use active view to generate geometry” option now works correctly.
(IFC4) Correct the orientation of some IfcAdvancedBRep faces.

New Import Functionality:
Import IfcProxy as Generic Models.

Import Bug Fixes:
Fix how the IFC GUID is set for certain elements.
Fix the orientation of some imported objects where part of the local placement needs to be calculated.
(IFC4) Read in some missing relations caused by “IsDefinedBy” split into 3 inverse attributes.

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