diff --git a/city_model_structure/attributes/polyhedron.py b/city_model_structure/attributes/polyhedron.py
index 7af0a38f..b792eee5 100644
--- a/city_model_structure/attributes/polyhedron.py
+++ b/city_model_structure/attributes/polyhedron.py
@@ -30,7 +30,7 @@ class Polyhedron:
     self._min_z = None
     self._min_y = None
     self._min_x = None
-    self._geometry = GeometryHelper(delta=5.0, area_delta=0.01)
+    self._geometry = GeometryHelper(delta=0.5, area_delta=0.001)
 
   def _position_of(self, point, face):
     vertices = self.vertices
diff --git a/city_model_structure/city_object.py b/city_model_structure/city_object.py
index 3244fae9..21cb91a6 100644
--- a/city_model_structure/city_object.py
+++ b/city_model_structure/city_object.py
@@ -19,7 +19,6 @@ class CityObject:
     self._lod = lod
     self._surfaces = surfaces
     self._polyhedron = None
-    self._geometry = GeometryHelper()
 
   @property
   def lod(self):
diff --git a/helpers/geometry_helper.py b/helpers/geometry_helper.py
index 4365863e..a5d4e197 100644
--- a/helpers/geometry_helper.py
+++ b/helpers/geometry_helper.py
@@ -17,10 +17,15 @@ class GeometryHelper:
   """
   Geometry helper class
   """
+
   def __init__(self, delta=0.5, area_delta=0.5):
     self._delta = delta
     self._area_delta = area_delta
 
+  @property
+  def config(self):
+    print(f'delta {self._delta} area {self._area_delta}')
+
   @staticmethod
   def adjacent_locations(location1, location2):
     """
@@ -46,7 +51,7 @@ class GeometryHelper:
     delta = math.fabs(a1 - a2)
     return delta <= self._area_delta
 
-  def almost_equal(self, v1, v2, debug=False):
+  def almost_equal(self, v1, v2):
     """
     Compare two points and decides if they are almost equal (quadratic error under delta)
     :param v1: [x,y,z]
diff --git a/tests/test_geometry_factory.py b/tests/test_geometry_factory.py
index b73ea27a..4d36871f 100644
--- a/tests/test_geometry_factory.py
+++ b/tests/test_geometry_factory.py
@@ -9,6 +9,7 @@ from unittest import TestCase
 
 from city_model_structure.city import City
 from factories.geometry_factory import GeometryFactory
+from helpers.geometry_helper import GeometryHelper
 
 
 class TestGeometryFactory(TestCase):
@@ -23,7 +24,8 @@ class TestGeometryFactory(TestCase):
     self._city_gml = None
     self._example_path = (Path(__file__).parent.parent / 'tests_data').resolve()
     self._pickle_file = (self._example_path / 'city.pickle').resolve()
-    self._big_pickle_file = (self._example_path / 'big.pickle').resolve()
+    self._kelowna_pickle_file = (self._example_path / 'kelowna_test_case.pickle').resolve()
+    self._output_path = (Path(__file__).parent / 'surface_outputs').resolve()
 
   def _get_citygml(self):
     if self._city_gml is None:
@@ -69,6 +71,21 @@ class TestGeometryFactory(TestCase):
     self.assertIsNotNone(city.country_code, 'country code is none')
     os.remove(self._pickle_file.resolve())
 
+  def test_surfaces_triangulation(self):
+    """
+    Test city surfaces triangulation and polygon creation
+    :return:
+    """
+    city = City.load(self._kelowna_pickle_file)
+    helper = GeometryHelper(delta=0.0, area_delta=0.5)
+    errors = 0
+    for building in city.buildings:
+      building._polyhedron._geometry = helper
+      if str(building.volume) == 'inf':
+        building.obj_export(self._output_path)
+        errors += 1
+    print(f'{errors} buildings aren\'t closed volumes')
+
   def test_citygml_buildings(self):
     """
     Test city objects in the city
diff --git a/tests_data/kelowna_test_case.pickle b/tests_data/kelowna_test_case.pickle
new file mode 100644
index 00000000..4897d569
Binary files /dev/null and b/tests_data/kelowna_test_case.pickle differ