Add highly incomplete proof of concept DXF2IFC script

src/ifcblenderexport/dxf2ifc.py

@@ -0,0 +1,55 @@
+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()