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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_PASSED.ifc	Extrusions_03_PASSED.rvt	Extrusions_04_FAILED_rvt.ifc	Extrusions_05_FAILED_rvt.rvt
				Extrusions_05_FAILED_rvt.FCStd
		Extrusions_03_PASSED.FCStd
		Extrusions_03_PASSED.blend	Extrusions_04_PASSED_blend.ifc	Extrusions_05_PASSED_blend.rvt
		Extrusions_03_PASSED.pln	Extrusions_04_PASSED_pln.ifc	Extrusions_05_PASSED_pln.pln
				Extrusions_05_PASSED_pln.rvt

Tests

1. Extrusions

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.));

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.
The positions and extrusion directions are correct when the IFC file is viewed with ifc++

Results

Test files here: FreeMVD_WorkFlow/Specifications_Test_Files/Extrusions/

Program	Version native/plugin	3-Imported Native File	Import Comments	4-Exported IFC File	Export Comments
ArchiCAD
BlenderBIM	2.82a/0.200511	FAILED	- imported as mesh	FAILED	- changed IFCEXTRUDEDAREASOLID to IFCFACETEDBREP w/ IFCFACE
FreeCAD		PASSED		PASSED
Revit	2020/20.1.0.1	PASSED		FAILED	- Incorrect extrusion direction - IFCARBITRARYCLOSEDPROFILEDEF was changed to IFCRECTANGLEPROFILEDEF
Vectorworks

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