IfcOpenShell/src/ifcblenderexport/dxf2ifc.py

class Dxf2Ifc:
    def execute(self):
        self.create_ifc_file()
        doc = ezdxf.readfile('input.dxf')
        model = doc.modelspace()
        products = []
        for entity in model:
            print(entity)
            if entity.get_mode() == 'AcDbPolyFaceMesh':
                ifc_faces = []
                for face in entity.faces():
                    ifc_faces.append(
                        self.file.createIfcFace([self.file.createIfcFaceOuterBound(self.file.createIfcPolyLoop([
                                self.file.createIfcCartesianPoint((v.dxf.location)) for v in face[0:3]]), True)]))
                representation = self.file.createIfcProductDefinitionShape(None, None, [self.file.createIfcShapeRepresentation(
                    self.subcontext, 'Body', 'Brep', [self.file.createIfcFacetedBrep(self.file.createIfcClosedShell(ifc_faces))])])
                products.append(self.file.create_entity('IfcBuildingElementProxy', **{
                    'GlobalId': ifcopenshell.guid.new(),
                    'Name': entity.dxf.layer,
                    'ObjectPlacement': self.placement,
                    'Representation': representation
                }))
            else:
                print('Not yet implemented')
        self.file.createIfcRelContainedInSpatialStructure(ifcopenshell.guid.new(), None, None, None, products, self.site)
        self.file.write('test.ifc')

    def create_ifc_file(self):
        self.file = ifcopenshell.file()
        units = self.file.createIfcUnitAssignment([
            self.file.createIfcSIUnit(None, 'LENGTHUNIT', None, 'METRE')
        ])
        self.origin = self.file.createIfcAxis2Placement3D(
            self.file.createIfcCartesianPoint((0., 0., 0.)),
            self.file.createIfcDirection((0., 0., 1.)),
            self.file.createIfcDirection((1., 0., 0.)))
        self.placement = self.file.createIfcLocalPlacement(None, self.origin)
        self.context = self.file.createIfcGeometricRepresentationContext(None, 'Model', 3, 1.0E-05, self.origin)
        self.subcontext = self.file.createIfcGeometricRepresentationSubcontext(
            'Body', 'Model', None, None, None, None, self.context, None, 'MODEL_VIEW', None)
        self.project = self.file.create_entity('IfcProject', **{
            'GlobalId': ifcopenshell.guid.new(),
            'Name': 'DXF Conversion',
            'RepresentationContexts': [self.context],
            'UnitsInContext': units
        })
        self.site = self.file.create_entity('IfcSite', **{
            'GlobalId': ifcopenshell.guid.new(),
            'Name': 'DXF Conversion Site',
            'ObjectPlacement': self.placement
        })
        self.file.createIfcRelAggregates(ifcopenshell.guid.new(), None, None, None, self.project, [self.site])

dxf2ifc = Dxf2Ifc()
dxf2ifc.execute()