Basic geometry export

README.md

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+# Blender BIM IFC
+
+_Under heavy development!_
+
+Let's use Blender to create BIM models, because why not?

foo.py

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+import ifcopenshell
+import bpy
+
+template_file = '/home/dion/Projects/blender-bim-ifc/template.ifc'
+output_file = '/home/dion/Projects/blender-bim-ifc/output.ifc'
+f = ifcopenshell.open(template_file)
+
+origin = f.by_type("IfcAxis2Placement3D")[0]
+owner_history = f.by_type("ifcownerhistory")[0]
+
+context = f.createIfcGeometricRepresentationContext(
+    None, "Model",
+    3, 1.0E-05,
+    origin,
+    f.createIfcDirection((0., 1., 0.)))
+
+subcontext = f.createIfcGeometricRepresentationSubContext(
+    "Body", "Model",
+    None, None, None, None,
+    context, None, "MODEL_VIEW", None)
+
+project = f.createIfcProject(
+    ifcopenshell.guid.new(),
+    owner_history,
+    'Name', None,
+    None, None, None, [context],
+    f.by_type("IfcUnitAssignment")[0])
+
+building_placement = f.createIfcLocalPlacement(None, origin)
+
+building = f.createIfcBuilding(
+    ifcopenshell.guid.new(),
+    owner_history, 'My building', None, None,
+    building_placement,
+    None, None, 'ELEMENT', None, None, None)
+    
+building_storey_placement = f.createIfcLocalPlacement(building_placement, origin)
+
+building_storey = f.createIfcBuildingStorey(
+    ifcopenshell.guid.new(),
+    owner_history, 'Ground floor', None, None,
+    building_storey_placement, None, None, 'ELEMENT', None)
+    
+f.createIfcRelAggregates(
+    ifcopenshell.guid.new(),
+    owner_history, None, None, building, [building_storey])
+    
+f.createIfcRelAggregates(
+    ifcopenshell.guid.new(),
+    owner_history, None, None, project, [building])
+
+ifc_products = []
+
+for object in bpy.context.selected_objects:
+    ifc_vertices = []
+    ifc_faces = []
+    for vertice in object.data.vertices:
+        ifc_vertices.append(
+            f.createIfcCartesianPoint((vertice.co.x, vertice.co.y, vertice.co.z)))
+    for polygon in object.data.polygons:
+        ifc_faces.append(f.createIfcFace([
+            f.createIfcFaceOuterBound(
+                f.createIfcPolyLoop([ifc_vertices[vertice] for vertice in polygon.vertices]),
+                True)]))
+                
+    representation = f.createIfcProductDefinitionShape(None, None,
+        [f.createIfcShapeRepresentation(
+            subcontext, 'Body', 'Brep',
+            [f.createIfcFacetedBrep(f.createIfcClosedShell(ifc_faces))])])
+            
+    placement = f.createIfcLocalPlacement(building_storey_placement,
+        f.createIfcAxis2Placement3D(
+            f.createIfcCartesianPoint(
+                (object.location.x, object.location.y, object.location.z))))
+                
+    ifc_products.append(f.createIfcBuildingElementProxy(
+        ifcopenshell.guid.new(),
+        owner_history, object.name, None, None, placement, representation, None, None))
+        
+f.createIfcRelContainedInSpatialStructure(
+    ifcopenshell.guid.new(), owner_history, None, None, ifc_products, building_storey)
+
+f.write(output_file)

template.ifc

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+ISO-10303-21;
+HEADER;
+FILE_DESCRIPTION(('ViewDefinition [CoordinationView]'),'2;1');
+FILE_NAME('$filename','2019-05-12T12:33:45',('$owner','$email'),('$company'),'IfcOpenShell','IfcOpenShell','');
+FILE_SCHEMA(('IFC2X3'));
+ENDSEC;
+DATA;
+#1=IFCPERSON($,$,'$owner',$,$,$,$,$);
+#2=IFCORGANIZATION($,'$company',$,$,$);
+#3=IFCPERSONANDORGANIZATION(#1,#2,$);
+#4=IFCAPPLICATION(#2,'$version','FreeCAD','118df2cf_ed21_438e_a41');
+#5=IFCOWNERHISTORY(#3,#4,$,.ADDED.,$,#3,#4,$now);
+#6=IFCDIRECTION((1.,0.,0.));
+#7=IFCDIRECTION((0.,0.,1.));
+#8=IFCCARTESIANPOINT((0.,0.,0.));
+#9=IFCAXIS2PLACEMENT3D(#8,#7,#6);
+#10=IFCDIRECTION((0.,1.,0.));
+#12=IFCDIMENSIONALEXPONENTS(0,0,0,0,0,0,0);
+#13=IFCSIUNIT(*,.LENGTHUNIT.,$,.METRE.);
+#14=IFCSIUNIT(*,.AREAUNIT.,$,.SQUARE_METRE.);
+#15=IFCSIUNIT(*,.VOLUMEUNIT.,$,.CUBIC_METRE.);
+#16=IFCSIUNIT(*,.PLANEANGLEUNIT.,$,.RADIAN.);
+#17=IFCMEASUREWITHUNIT(IFCPLANEANGLEMEASURE(0.017453292519943295),#16);
+#18=IFCCONVERSIONBASEDUNIT(#12,.PLANEANGLEUNIT.,'DEGREE',#17);
+#19=IFCUNITASSIGNMENT((#13,#14,#15,#18));
+ENDSEC;
+END-ISO-10303-21;