FreeMVD_Mirror/IFC_roundtrip_specifications.md

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.

1. importing and exporting a simple extrusion

The application should be able to export and import an IFC file containing one IfcBuildingElementProxy entity, with one representation, which is an IfcExtrudedAreaSolid, based on an IfcArbitraryClosedProfileDef made of an IfcPolyline, like the example below:

  #20= IFCBUILDINGELEMENTPROXY('0ohBfsArr3ruXYxacT4yl5',#1,'NOTDEFINED',$,$,#2,#21,$,.NOTDEFINED.);
    #21= IFCPRODUCTDEFINITIONSHAPE($,$,(#22));
      #22= IFCSHAPEREPRESENTATION(#9,'Body','SweptSolid',(#23));
        #23= IFCEXTRUDEDAREASOLID(#24,$,#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.));

Import criteria

• The extrusion can be changed after import
• The base polyline can be edited after import

Export criteria

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

Results

	BlenderBIM	FreeCAD	Revit	ArchiCAD	BricsCAD
passed?
exported file:
imported file: