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IFC_roundtrip_specifications.md

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IFC roundtripping specifications

This file lists "exercises" to be performed by a BIM application to achieve adequate round-tripping with IFC files. The application should successfully complete all the steps.

File Naming Convension Examples:

1 – Original File 2 – Exported IFC File 3 – Imported Native File 4 – Exported IFC File 5 – Imported Native File
Extrusions_01.FCStd Extrusions_02_PASS.ifc Extrusions_03_PASS.rvt Extrusions_04_FAIL_rvt.ifc Extrusions_05_FAIL_rvt.rvt
Extrusions_05_FAIL_rvt.FCStd
Extrusions_03_PASS.FCStd
Extrusions_03_PASS.blend Extrusions_04_PASS_blend.ifc Extrusions_05_PASS_blend.rvt
Extrusions_03_PASS.pln Extrusions_04_PASS_pln.ifc Extrusions_05_PASS_pln.pln
Extrusions_05_PASS_pln.rvt

Tests

Extrusions_Rectangles

The application should be able to export and import an IFC file containing three IfcBuildingElementProxy entities, each with one representation, which is an IfcExtrudedAreaSolid, each based on IfcArbitraryClosedProfileDef made of an IfcPolyline, like the example below. One profile should lie on the XY plane, one in the YZ plane, and a third on a plane made of one of the former rotated 45° along the Y axis. Extrusion directions should be normal to the profiles.

  #20= IFCBUILDINGELEMENTPROXY('0ohBfsArr3ruXYxacT4yl5',#1,'NOTDEFINED',$,$,#2,#21,$,.NOTDEFINED.);
    #21= IFCPRODUCTDEFINITIONSHAPE($,$,(#22));
      #22= IFCSHAPEREPRESENTATION(#9,'Body','SweptSolid',(#23));
        #23= IFCEXTRUDEDAREASOLID(#24,#31,#25,2000.);
          #24 = IFCARBITRARYCLOSEDPROFILEDEF(.AREA., $, #26);
            #26 = IFCPOLYLINE((#27, #28, #29, #30));
              #27 = IFCCARTESIANPOINT((0., 0.));
              #28 = IFCCARTESIANPOINT((1000., 0.));
              #29 = IFCCARTESIANPOINT((1000., 1000.));
              #30 = IFCCARTESIANPOINT((0., 1000.));
          #25= IFCDIRECTION((0.,0.,1.));
          #31= IFCAXIS2PLACEMENT3D(#32,#33,#34);
            #32= IFCDIRECTION((0.7071,0.,-0.7071));
            #33= IFCDIRECTION((0.7071,0.,0.7071));
            #34= IFCCARTESIANPOINT((1000.,0.,2000.));

Native Funtionality

Program Native funtion/object
ArchiCAD
BlenderBIM Mesh - IfcArbitraryClosedProfileDef & ExtrudedDirection saved via Vertex Groups
FreeCAD
Microstation
Revit Model-in-Place Family - Solid Extrusion
Vectorworks

Import criteria

  • The extrusion directions and profile positions are correct
  • The extrusions can be changed after import
  • The base polylines can be edited after import

Export criteria

  • The exported IFC file contains three
    • IfcBuildingElementProxy, each with an
      • IfcExtrudedAreaSolid as its representation and an
        • IfcArbitraryClosedProfileDef made of an
          • IfcPolyline as its profile.

Results

Test files here: FreeMVD_WorkFlow/Specifications_Test_Files/Extrusions_Rectangles/

Program Version
native/plugin		 Imported Native File (PASS/FAIL) Import Comments Exported IFC File (PASS/FAIL) Export Comments
ArchiCAD
BlenderBIM 2.82a/0.200621 ✔️ editing the profile's base polylines, however, is cumbersome ✔️
FreeCAD ✔️ ✔️
Revit 2020/20.1.0.1 ✔️ ❌ - Incorrect extrusion direction
- IFCARBITRARYCLOSEDPROFILEDEF was changed to IFCRECTANGLEPROFILEDEF
Vectorworks

Extrusions_Circles

The application should be able to export and import an IFC file containing 2 circle extrusions.

Native Funtionality

Program Native funtion/object
ArchiCAD
BlenderBIM Mesh
FreeCAD
Microstation
Revit Model-in-Place Family - Solid Extrusion
Vectorworks

Import criteria

  • The extrusion directions and profile positions are correct
  • The extrusions can be changed after import
  • The radius of the circles can be changed after import

Export criteria

  • (2) IFCEXTRUDEDAREASOLIDs with
    • (1) IFCCIRCLEPROFILEDEF

Results

Test files here: FreeMVD_WorkFlow/Specifications_Test_Files/Extrusions_Circles

Program Version
native/plugin		 Imported Native File (PASS/FAIL) Import Comments Exported IFC File (PASS/FAIL) Export Comments
ArchiCAD
BlenderBIM 2.82a/200829-win Partial the radius value is not accessible.  Possible room for UI improvement in the future, in using modifiers, curves, etc. ✔️
FreeCAD
Revit Partial creates (2) arcs instead of a circle ✔️ if native file has (2) arcs as the profile, it still exports as IFCCIRCLEPROFILEDEFs
Vectorworks

Extrusions_Arcs

The application should be able to export and import an IFC file containing 2 extrusions with arcs in the profile.

Native Funtionality

Program Native funtion/object
ArchiCAD
BlenderBIM
FreeCAD
Microstation
Revit Model-in-Place Family - Solid Extrusion
Vectorworks

Import criteria

  • The extrusion directions and profile positions are correct
  • The extrusions can be changed after import
  • The radius of the arcs can be changed after import

Export criteria

  • IFCEXTRUDEDAREASOLID
    • IFCARBITRARYCLOSEDPROFILEDEF
      • IFCCOMPOSITECURVE
        • (1) IFCCOMPOSITECURVESEGMENT (the arc)
          • IFCTRIMMEDCURVE
            • IFCCIRCLE
        • (4) IFCCOMPOSITECURVESEGMENT (the straight lines)
          • IFCPOLYLINE

Results

Test files here: FreeMVD_WorkFlow/Specifications_Test_Files/Arcs

Program Version
native/plugin		 Imported Native File (PASS/FAIL) Import Comments Exported IFC File (PASS/FAIL) Export Comments
ArchiCAD
BlenderBIM 2.82a/0.200621 FAIL creates a faceted mesh FAIL
FreeCAD
Revit ✔️ ✔️
VectorWorks

Extrusions_Void_InnerBoundary

Native Funtionality

Program Native funtion/object
ArchiCAD
BlenderBIM
FreeCAD
Microstation
Revit Model-in-Place Family - Solid Extrusion
Vectorworks

Import criteria

  • The extrusion directions and profile positions are correct
  • The extrusions can be changed after import
  • The base polylines can be edited after import

Export criteria

  • IFCEXTRUDEDAREASOLID
    • IFCARBITRARYPROFILEDEFWITHVOIDS
      • IFCPOLYLINE
        • IFCPOLYLINE

Results

Test files here: FreeMVD_WorkFlow/Specifications_Test_Files/Extrusions_Void_InnerBoundary/

Program Version
native/plugin		 Imported Native File (PASS/FAIL) Import Comments Exported IFC File (PASS/FAIL) Export Comments
ArchiCAD
BlenderBIM 2.82a/0.200511 ❌ Profile and Extrusion Direction not available
FreeCAD ✔️
Revit 2020/20.1.0.1 ✔️ ✔️
Vectorworks

Mapped Items

Mapped Items, which go by many different names in different BIM apps (a few called out below), are objects where the definition of one object is connected to another. That is, if one istance is modified, these changes will also be reflected in other connected or linked instances.

Native Funtionality

Program Native funtion/object
ArchiCAD Objects, Modules
BlenderBIM Linked Objects
FreeCAD Clones
Microstation Cells
Revit Groups, Families
Vectorworks Symbols

Import criteria

  • That the connection or link between objects in still intact. That is, if one instance is changed, the other instances will change as well.

Export criteria

  • The IFC file has the same shared mapping connected to the objects--circled in red below.

Results

Test files here: Specifications_Test_Files/Mapped_Items/

Program Version
native/plugin		 Imported Native File (PASS/FAIL) Import Comments Exported IFC File (PASS/FAIL) Export Comments
ArchiCAD
BlenderBIM 2.82a/0.200511 ✔️ ✔️
FreeCAD ✔️ ✔️
Revit 2020/20.1.0.1 ❌ link was broken between objects ❌
Vectorworks

Model_Lines_Straight

Straight lines in 3D space.

Native Funtionality

Program Native funtion/object
ArchiCAD
BlenderBIM
FreeCAD
Microstation
Revit Model Lines
Vectorworks

Import criteria

Export criteria

From Revit...

/*#160= IFCPRODUCTDEFINITIONSHAPE($,$,(#157));*/
  /*#157= IFCSHAPEREPRESENTATION(#113,'Annotation','Annotation2D',(#147));*/
    /*#113= IFCGEOMETRICREPRESENTATIONSUBCONTEXT($,'Annotation',*,*,*,*,#112,0.01,.PLAN_VIEW.,$);*/
      /*#112= IFCGEOMETRICREPRESENTATIONCONTEXT($,'Annotation',3,0.0001,#101,#102);*/
        /*#101= IFCAXIS2PLACEMENT3D(#6,$,$);*/
          /*#6= IFCCARTESIANPOINT((0.,0.,0.));*/
        /*#102= IFCDIRECTION((6.12303176911189E-17,1.));*/
    /*#147= IFCGEOMETRICCURVESET((#145,#183,#199,#215,#231));*/
      /*#145= IFCPOLYLINE((#9,#143));*/
        /*#9= IFCCARTESIANPOINT((0.,0.));*/

Results

Test files here: Model_Lines_Straight

Program Version
native/plugin		 Imported Native File (PASS/FAIL) Import Comments Exported IFC File (PASS/FAIL) Export Comments
ArchiCAD
BlenderBIM 2.83.2/200731-win ❌
FreeCAD
Revit 2020/20.1.0.1 ✔️ ✔️
Vectorworks