Support IfcIndexedPolyCurve for more robust 2D representations

src/ifcblenderexport/blenderbim/bim/export_ifc.py

@@ -2433,21 +2433,9 @@ class IfcExporter():
             return self.create_curves_from_curve(curve, is_2d=is_2d)
 
     def create_curves_from_mesh(self, mesh, is_2d=False):
-        self.create_vertices(mesh.vertices, is_2d=is_2d)
+        return [self.file.createIfcIndexedPolyCurve(
-        edges = list(mesh.edges)
+            self.create_cartesian_point_list_from_vertices(mesh.vertices, is_2d=is_2d),
-        loop_vertices = []
+            [self.file.createIfcLineIndex(tuple(e.vertices)) for e in mesh.edges])]
-        loops = []
-        # Not a fast algorithm, but easy
-        while edges:
-            for i, edge in enumerate(edges):
-                if edge.vertices[0] in loop_vertices \
-                        and edge.vertices[1] in loop_vertices:
-                    del edges[i]
-            loop_vertex_indices = self.get_loop_from_edges(edges)
-            loop_vertices.extend(loop_vertex_indices)
-            loops.append(self.file.createIfcPolyline([
-                self.ifc_vertices[i] for i in loop_vertex_indices]))
-        return loops
 
     def create_curves_from_curve(self, curve, is_2d=False):
         results = []
@@ -2690,6 +2678,11 @@ class IfcExporter():
                 representation['target_view']]['ifc'],
             representation['subcontext'], 'Brep', items)
 
+    def create_cartesian_point_list_from_vertices(self, vertices, is_2d=False):
+        if is_2d:
+            return self.file.createIfcCartesianPointList2D([self.convert_si_to_unit(v.co.xy) for v in vertices])
+        return self.file.createIfcCartesianPointList3D([self.convert_si_to_unit(v.co) for v in vertices])
+
     def create_vertices(self, vertices, is_2d=False):
         if is_2d:
             for v in vertices:

src/ifcblenderexport/blenderbim/bim/module/model/door.py

@@ -31,7 +31,7 @@ def add_object(self, context):
     ]
     edges = [[0, 1], [1, 2], [2, 3]]
     faces = []
-    mesh = bpy.data.meshes.new(name="IfcDoor/Dumb Door")
+    mesh = bpy.data.meshes.new(name="Dumb Door")
     mesh.from_pydata(verts, edges, faces)
     obj2 = object_data_add(context, mesh, operator=self)
     bpy.ops.object.convert(target='CURVE')
@@ -85,11 +85,13 @@ def add_object(self, context):
     obj4.display_type = 'WIRE'
     obj4.parent = obj2
     obj4.matrix_parent_inverse = obj2.matrix_world.inverted()
+    obj4.hide_render = True
     obj4.name = 'IfcOpeningElement/Dumb Door Opening'
     attribute = obj4.BIMObjectProperties.attributes.add()
     attribute.name = 'PredefinedType'
     attribute.string_value = 'OPENING'
 
+    obj2.name = 'IfcDoor/Dumb Door'
     attribute = obj2.BIMObjectProperties.attributes.add()
     attribute.name = 'PredefinedType'
     attribute.string_value = 'DOOR'

src/ifcblenderexport/blenderbim/bim/module/model/window.py

@@ -29,7 +29,7 @@ def add_object(self, context):
     ]
     edges = [[0, 1], [1, 2], [2, 3]]
     faces = []
-    mesh = bpy.data.meshes.new(name="IfcWindow/Dumb Window")
+    mesh = bpy.data.meshes.new(name="Dumb Window")
     mesh.from_pydata(verts, edges, faces)
     obj2 = object_data_add(context, mesh, operator=self)
     bpy.ops.object.convert(target='CURVE')
@@ -84,11 +84,13 @@ def add_object(self, context):
     obj4.display_type = 'WIRE'
     obj4.parent = obj2
     obj4.matrix_parent_inverse = obj2.matrix_world.inverted()
+    obj4.hide_render = True
     obj4.name = 'IfcOpeningElement/Dumb Window Opening'
     attribute = obj4.BIMObjectProperties.attributes.add()
     attribute.name = 'PredefinedType'
     attribute.string_value = 'OPENING'
 
+    obj2.name = 'IfcWindow/Dumb Window'
     attribute = obj2.BIMObjectProperties.attributes.add()
     attribute.name = 'PredefinedType'
     attribute.string_value = 'WINDOW'

src/ifcblenderexport/blenderbim/bim/operator.py

@@ -2123,6 +2123,8 @@ class CutSection(bpy.types.Operator):
             elif obj.type == 'FONT':
                 ifc_cutter.text_objs.append(obj)
 
+        # TODO: this should be detected from the IFC, not from Blender, and
+        # should use a bbox calculation to determine whether it is shown
         for obj in bpy.context.visible_objects:
             for subcontext in  obj.BIMObjectProperties.representation_contexts:
                 if subcontext.context == 'Plan' \