diff --git a/hub/city_model_structure/building.py b/hub/city_model_structure/building.py
index e4d654b2..5a6e109e 100644
--- a/hub/city_model_structure/building.py
+++ b/hub/city_model_structure/building.py
@@ -810,3 +810,17 @@ class Building(CityObject):
                                              orientation_losses_factor[_key]['south'])]
           self._onsite_electrical_production[_key] = _results
     return self._onsite_electrical_production
+
+  @property
+  def lower_corner(self):
+    """
+    Get building lower corner.
+    """
+    return [self._min_x, self._min_y, self._min_z]
+
+  @property
+  def upper_corner(self):
+    """
+    Get building upper corner.
+    """
+    return [self._max_x, self._max_y, self._max_z]
diff --git a/hub/exports/formats/glb.py b/hub/exports/formats/glb.py
index 67b5a960..6329788d 100644
--- a/hub/exports/formats/glb.py
+++ b/hub/exports/formats/glb.py
@@ -1,4 +1,3 @@
-import glob
 import os
 import shutil
 import subprocess
@@ -33,24 +32,18 @@ class Glb:
   def _export(self):
     try:
       for building in self._city.buildings:
-        print(self._city.lower_corner, self._city.upper_corner)
         city = City(self._city.lower_corner, self._city.upper_corner, self._city.srs_name)
-        city.name = building.name
         city.add_city_object(building)
+        city.name = building.name
         Obj(city, self._path)
         glb = f'{self._path}/{building.name}.glb'
         subprocess.run([
           self._obj2gtl,
           '-i', f'{self._path}/{building.name}.obj',
           '-b',
-          '-o', f'{glb}',
-          '--triangleWindingOrderSanitization',
-          '--inputUpAxis', 'Y',
-          '--outputUpAxis', 'Y'
+          '-o', f'{glb}'
         ])
-
         os.unlink(f'{self._path}/{building.name}.obj')
         os.unlink(f'{self._path}/{building.name}.mtl')
     except (subprocess.SubprocessError, subprocess.TimeoutExpired, subprocess.CalledProcessError) as err:
       raise GltExceptionError from err
-
diff --git a/hub/exports/formats/obj.py b/hub/exports/formats/obj.py
index 219bb1ac..d212740c 100644
--- a/hub/exports/formats/obj.py
+++ b/hub/exports/formats/obj.py
@@ -4,7 +4,6 @@ SPDX - License - Identifier: LGPL - 3.0 - or -later
 Copyright © 2022 Concordia CERC group
 Project Coder Guille Gutierrez guillermo.gutierrezmorote@concordia.ca
 """
-import math
 from pathlib import Path
 
 import numpy as np
@@ -27,7 +26,7 @@ class Obj:
 
   def _to_vertex(self, coordinate):
     x, y, z = self._ground(coordinate)
-    return f'v {x} {z} {y}\n'
+    return f'v {x} {z} -{y}\n'  # to match opengl expectations
 
   def _to_texture_vertex(self, coordinate):
     u, v, _ = self._ground(coordinate)
@@ -55,22 +54,22 @@ class Obj:
     with open(mtl_file_path, 'w', encoding='utf-8') as mtl:
       mtl.write("newmtl cerc_base_material\n")
       mtl.write("Ka 1.0 1.0 1.0      # Ambient color (white)\n")
-      mtl.write("Kd 0.3 0.1 0.3      # Diffuse color (greenish)\n")
+      mtl.write("Kd 0.1 0.3 0.1      # Diffuse color (greenish)\n")
       mtl.write("Ks 1.0 1.0 1.0      # Specular color (white)\n")
       mtl.write("Ns 400.0             # Specular exponent (defines shininess)\n")
     vertices = {}
-    normals_index = {}
     faces = []
     vertex_index = 0
     normal_index = 0
     with open(obj_file_path, 'w', encoding='utf-8') as obj:
       obj.write("# cerc-hub export\n")
-      obj.write(f'mtllib {mtl_name}')
+      obj.write(f'mtllib {mtl_name}\n')
 
       for building in self._city.buildings:
         obj.write(f'# building {building.name}\n')
         obj.write(f'g {building.name}\n')
         obj.write('s off\n')
+
         for surface in building.surfaces:
           obj.write(f'# surface {surface.name}\n')
           face = []
@@ -79,7 +78,6 @@ class Obj:
           textures = []
           for coordinate in surface.perimeter_polygon.coordinates:
             vertex = self._to_vertex(coordinate)
-
             if vertex not in vertices:
               vertex_index += 1
               vertices[vertex] = vertex_index
@@ -88,8 +86,7 @@ class Obj:
               textures.append(self._to_texture_vertex(coordinate))  # only append if non-existing
             else:
               current = vertices[vertex]
-
-            face.insert(0, f'{current}/{current}/{normal_index}')  # insert counterclockwise
+            face.append(f'{current}/{current}/{normal_index}')  # insert clockwise
           obj.writelines(normal)  # add the normal
           obj.writelines(textures)  # add the texture vertex