diff --git a/navipy/resources/corridor.blend b/navipy/resources/corridor.blend
new file mode 100644
index 0000000000000000000000000000000000000000..1e3ac247fb14e64309e4afdeb9d89be836136a4f
Binary files /dev/null and b/navipy/resources/corridor.blend differ
diff --git a/navipy/resources/corridor_traj.csv b/navipy/resources/corridor_traj.csv
new file mode 100644
index 0000000000000000000000000000000000000000..b288f9aded99e8c479488601e345944c872b3f0e
--- /dev/null
+++ b/navipy/resources/corridor_traj.csv
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diff --git a/navipy/sensors/blend_overlaytraj.py b/navipy/sensors/blend_overlaytraj.py
index 8b35bac84fe67c53548e10eb4304d65d8686d10c..87b1528863c63a277c2305232ade847e26d0d3c9 100644
--- a/navipy/sensors/blend_overlaytraj.py
+++ b/navipy/sensors/blend_overlaytraj.py
@@ -1,5 +1,5 @@
 """
-
+ Overlay a trajectory in a blender environment
 """
 import sys
 import argparse
@@ -20,9 +20,9 @@ def parser_blend_overlaytraj():
     parser = argparse.ArgumentParser()
     arghelp = 'Path to the environment (.blend) in which your agent lives'
     defaultworld = pkg_resources.resource_filename(
-        'navipy', 'resources/twocylinders_world.blend')
+        'navipy', 'resources/corridor.blend')
     defaulttraj = pkg_resources.resource_filename(
-        'navipy', 'resources/twocylinders_traj.hdf')
+        'navipy', 'resources/corridor_traj.csv')
     parser.add_argument('--blender-world',
                         type=str,
                         default=defaultworld,
@@ -53,20 +53,21 @@ def parser_blend_overlaytraj():
 def run(trajfile):
     import bpy
     # Load trajectory
-    trajectory = Trajectory().fromfile(trajfile)
+    trajectory = Trajectory().read_csv(trajfile)
     # create the Curve Datablock
     curveData = bpy.data.curves.new('myCurve', type='CURVE')
     curveData.dimensions = '3D'
     curveData.resolution_u = 2
     # map coords to spline
     polyline = curveData.splines.new('POLY')
-    polyline.points.add(trajectory.shape[0])
+    polyline.points.add(trajectory.shape[0] - 1)
     i = 0
     for _, coord in trajectory.iterrows():
         polyline.points[i].co = (coord.loc[('location', 'x')],
                                  coord.loc[('location', 'y')],
                                  coord.loc[('location', 'z')],
                                  1)
+        i += 1
 
     # create Object
     curveOB = bpy.data.objects.new('my_trajectory', curveData)
@@ -83,12 +84,6 @@ def main():
 
     # Fetch arguments
     args = parser_blend_overlaytraj().parse_args()
-    # Some output
-    print('-----')
-    print('Config file:\n{}'.format(args.config_file))
-    print('Blender file:\n{}'.format(args.blender_world))
-    print('Output file:\n{}'.format(args.output_file))
-    print('-----')
     # Create tempfile with testing code and then call blendnavipy
     header = '# Generated by {}\n'.format(sys.argv[0])
     with tempfile.NamedTemporaryFile() as tfile:
@@ -103,7 +98,6 @@ def main():
         tfile.write('try:\n'.encode(encoding))
         tfile.write('     run("{}")\n'.format(
             args.trajectory).encode(encoding))
-        tfile.write('     sys.exit(0)\n'.encode(encoding))
         tfile.write('except Exception:\n'.encode(encoding))
         tfile.write('     sys.exit(1)\n'.encode(encoding))
         tfile.seek(0)
diff --git a/navipy/sensors/blendnavipy.py b/navipy/sensors/blendnavipy.py
index 16555dc0a47c37c92692a37f97fc7f9f6b1abcfc..6e10cfb634123697f19b427f355176f092e457b0 100644
--- a/navipy/sensors/blendnavipy.py
+++ b/navipy/sensors/blendnavipy.py
@@ -76,6 +76,12 @@ def parser_blendnavipy():
                         action='count',
                         default=0,
                         help=arghelp)
+
+    arghelp = 'To run the script in the background'
+    parser.add_argument('--background',
+                        action='count',
+                        default=0,
+                        help=arghelp)
     return parser
 
 
@@ -150,7 +156,11 @@ def main():
             print('=================')
             print(tfile.read().decode(encoding))
             tfile.seek(0)
-        command = '{} {} --background --python {}'.format(
+        command = '{} {} '
+        if args.background:
+            command += '--background '
+        command += '--python {}'
+        command = command.format(
             args.blender_command,
             args.blender_world,
             tfile.name)
diff --git a/navipy/sensors/blendunittest.py b/navipy/sensors/blendunittest.py
index cc7aedd1f40346b1231f7ec2be6c5e0dbe2def71..098a3db2c6341216af3018a56d54d7f703e144cb 100644
--- a/navipy/sensors/blendunittest.py
+++ b/navipy/sensors/blendunittest.py
@@ -82,7 +82,8 @@ def main():
         tfile.write('     sys.exit(1)\n'.encode(encoding))
         tfile.seek(0)
 
-        command = 'blendnavipy --blender-world {} --python-script {}'
+        command = 'blendnavipy --background --blender-world {}'
+        command += ' --python-script {}'
         command = command.format(args.blender_world, tfile.name)
         if args.blender_command is not None:
             command += ' --blender-command {}'.format(args.blender_command)
diff --git a/navipy/tools/trajectory.py b/navipy/tools/trajectory.py
index cc2c890768bbab3b4cf9bbb1ea7937a2fc413ab8..43ff6003e4d2b1fa90d2479e88d509e75b8b64b7 100644
--- a/navipy/tools/trajectory.py
+++ b/navipy/tools/trajectory.py
@@ -7,7 +7,7 @@ import navipy.maths.constants as mconst
 
 
 class Trajectory(pd.DataFrame):
-    def __init__(self, rotconv, indeces):
+    def __init__(self, rotconv='rzyx', indeces=np.arange(1)):
         columns = self.__build_columns(rotconv)
         super().__init__(index=indeces, columns=columns)
         self.__rotconv = rotconv
@@ -74,7 +74,7 @@ class Trajectory(pd.DataFrame):
 
     @property
     def alpha_0(self):
-        self.__get_alpha_i(0)
+        return self.__get_alpha_i(0)
 
     @alpha_0.setter
     def alpha_0(self, alpha_0):
@@ -82,7 +82,7 @@ class Trajectory(pd.DataFrame):
 
     @property
     def alpha_1(self):
-        self.__get_alpha_i(1)
+        return self.__get_alpha_i(1)
 
     @alpha_1.setter
     def alpha_1(self, alpha_1):
@@ -90,7 +90,7 @@ class Trajectory(pd.DataFrame):
 
     @property
     def alpha_2(self):
-        self.__get_alpha_i(2)
+        return self.__get_alpha_i(2)
 
     @alpha_2.setter
     def alpha_2(self, alpha_2):
@@ -112,7 +112,7 @@ class Trajectory(pd.DataFrame):
 
     @property
     def q_0(self):
-        self.__get_q_i(0)
+        return self.__get_q_i(0)
 
     @q_0.setter
     def q_0(self, q_0):
@@ -120,7 +120,7 @@ class Trajectory(pd.DataFrame):
 
     @property
     def q_1(self):
-        self.__get_q_i(1)
+        return self.__get_q_i(1)
 
     @q_1.setter
     def q_1(self, q_1):
@@ -128,7 +128,7 @@ class Trajectory(pd.DataFrame):
 
     @property
     def q_2(self):
-        self.__get_q_i(2)
+        return self.__get_q_i(2)
 
     @q_2.setter
     def q_2(self, q_2):
@@ -136,12 +136,63 @@ class Trajectory(pd.DataFrame):
 
     @property
     def q_3(self):
-        self.__get_q_i(3)
+        return self.__get_q_i(3)
 
     @q_3.setter
     def q_3(self, q_3):
         self.__set_q_i(3, q_3)
 
+    def read_csv(self, filename, sep=',', header=[0, 1], index_col=0):
+        """ Load from a hdf file
+        """
+        df = pd.read_csv(filename, sep=sep,
+                         header=[0, 1], index_col=0)
+        self.from_dataframe(df)
+        return self
+
+    def read_hdf(self, filename):
+        raise NameError('Not implemented')
+
+    def from_array(self, nparray, rotconv):
+        """ Assign trajectory from a numpy array
+            N x 6 (rotconv = Euler angles)
+            N x 7 (rotconv = quaternion)
+        """
+        # Check user input
+        if not isinstance(nparray, np.ndarray):
+            msg = 'nparray should be a np.ndarray and not {}'
+            msg = msg.format(type(nparray))
+            raise TypeError(msg)
+        indeces = np.arange(0, nparray.shape[0])
+        if rotconv == 'quaternion':
+            if nparray.shape[1] != 7:
+                msg = 'nparray should have size Nx7 and not {}'
+                msg = msg.format(nparray.shape)
+                raise ValueError(msg)
+        elif rotconv in mconst._AXES2TUPLE.keys():
+            if nparray.shape[1] != 6:
+                msg = 'nparray should have size Nx6 and not {}'
+                msg = msg.format(nparray.shape)
+                raise ValueError(msg)
+        columns = self.__build_columns(rotconv)
+        super().__init__(index=indeces, columns=columns)
+        self.__rotconv = rotconv
+        # Position
+        self.x = nparray[:, 0]
+        self.y = nparray[:, 1]
+        self.z = nparray[:, 2]
+        # Orientation
+        if self.__rotconv == 'quaternion':
+            self.q_0 = nparray[:, 3]
+            self.q_1 = nparray[:, 4]
+            self.q_2 = nparray[:, 5]
+            self.q_3 = nparray[:, 6]
+        else:
+            self.alpha_0 = nparray[:, 3]
+            self.alpha_1 = nparray[:, 4]
+            self.alpha_2 = nparray[:, 5]
+        return self
+
     def from_dataframe(self, df, rotconv=None):
         """ Assign trajectory from a dataframe
         """
@@ -150,6 +201,20 @@ class Trajectory(pd.DataFrame):
             if not np.all(rotconv == rotconv.iloc[0]):
                 raise ValueError('More than one rotconv detected')
             rotconv = rotconv.iloc[0]  # They are all the same :)
+        elif isinstance(df.columns, pd.MultiIndex):
+            if 'location' in df.columns.levels[0]:
+                rotconv = df.columns.levels[0].drop('location')
+                if len(rotconv) == 1:
+                    rotconv = rotconv[0]
+                else:
+                    msg = 'Could not determine rotconv from columns header'
+                    msg += '\n{}'.format(df.columns)
+                    raise ValueError(msg)
+            else:
+                msg = 'Could not determine rotconv from columns header'
+                msg += '\n{}'.format(df.columns)
+                raise ValueError(msg)
+
         elif rotconv is None:
             msg = 'When dataframe does not contains rotconv_id,'
             msg += 'a convention should be given'
@@ -160,19 +225,40 @@ class Trajectory(pd.DataFrame):
         super().__init__(index=indeces, columns=columns)
         self.__rotconv = rotconv
         # Position
-        self.x = df.x
-        self.y = df.y
-        self.z = df.z
+        if isinstance(df.columns, pd.MultiIndex):
+            self.x = df.loc[:, ('location', 'x')]
+            self.y = df.loc[:, ('location', 'y')]
+            self.z = df.loc[:, ('location', 'z')]
+        else:
+            self.x = df.x
+            self.y = df.y
+            self.z = df.z
         # Orientation
         if self.__rotconv == 'quaternion':
-            self.q_0 = df.q_0
-            self.q_1 = df.q_1
-            self.q_2 = df.q_2
+            if isinstance(df.columns, pd.MultiIndex):
+                self.q_0 = df.loc[:, (rotconv, 'q_0')]
+                self.q_1 = df.loc[:, (rotconv, 'q_1')]
+                self.q_2 = df.loc[:, (rotconv, 'q_2')]
+                self.q_3 = df.loc[:, (rotconv, 'q_3')]
+            else:
+                self.q_0 = df.q_0
+                self.q_1 = df.q_1
+                self.q_2 = df.q_2
+                self.q_3 = df.q_3
         else:
             if 'q_0' in df.columns:
                 self.alpha_0 = df.q_0
             elif 'alpha_0' in df.columns:
                 self.alpha_0 = df.alpha_0
+            elif isinstance(df.columns, pd.MultiIndex):
+                if 'q_0' in df.columns.levels[1]:
+                    self.alpha_0 = df.loc[:, (rotconv, 'q_0')]
+                elif 'alpha_0' in df.columns.levels[1]:
+                    self.alpha_0 = df.loc[:, (rotconv, 'alpha_0')]
+                else:
+                    msg = 'df should contains q_0 or alpha_0'
+                    msg += 'columns are:\n{}'.format(df.columns)
+                    raise KeyError(msg)
             else:
                 raise KeyError('df should contains q_0 or alpha_0')
 
@@ -180,6 +266,15 @@ class Trajectory(pd.DataFrame):
                 self.alpha_1 = df.q_1
             elif 'alpha_1' in df.columns:
                 self.alpha_1 = df.alpha_1
+            elif isinstance(df.columns, pd.MultiIndex):
+                if 'q_1' in df.columns.levels[1]:
+                    self.alpha_1 = df.loc[:, (rotconv, 'q_1')]
+                elif 'alpha_1' in df.columns.levels[1]:
+                    self.alpha_1 = df.loc[:, (rotconv, 'alpha_1')]
+                else:
+                    msg = 'df should contains q_1 or alpha_1'
+                    msg += 'columns are:\n{}'.format(df.columns)
+                    raise KeyError(msg)
             else:
                 raise KeyError('df should contains q_1 or alpha_1')
 
@@ -187,8 +282,18 @@ class Trajectory(pd.DataFrame):
                 self.alpha_2 = df.q_2
             elif 'alpha_2' in df.columns:
                 self.alpha_2 = df.alpha_2
+            elif isinstance(df.columns, pd.MultiIndex):
+                if 'q_2' in df.columns.levels[1]:
+                    self.alpha_2 = df.loc[:, (rotconv, 'q_2')]
+                elif 'alpha_2' in df.columns.levels[1]:
+                    self.alpha_2 = df.loc[:, (rotconv, 'alpha_2')]
+                else:
+                    msg = 'df should contains q_2 or alpha_2'
+                    msg += 'columns are:\n{}'.format(df.columns)
+                    raise KeyError(msg)
             else:
                 raise KeyError('df should contains q_2 or alpha_2')
+        return self
 
     def lollipops(self):
         raise NameError('Not implemented')
diff --git a/setup.py b/setup.py
index 4f8cc7ea5b32cd9f5924fcb0f202e094f6b9a156..8d38e165b67ad00247b93f91bd984ba26ae13e20 100644
--- a/setup.py
+++ b/setup.py
@@ -47,16 +47,21 @@ setup_dict = {'name': 'navipy',
                                    'flake8',
                                    'tox',
                                    'pyyaml',
-                                   'Pillow'],
+                                   'Pillow',
+                                   'tables'],
               'package_data': {'navipy':
                                ['resources/*.db',
                                 'resources/*.blend',
+                                'resources/*.csv',
                                 'resources/configs/*.yaml']},
               'include_package_data': True,
               'entry_points': {
                   'console_scripts': [
                       'blendnavipy=navipy.sensors.blendnavipy:main',
                       'blendunittest=navipy.sensors.blendunittest:main',
-                      'blendongrid=navipy.sensors.blend_ongrid:main']}, }
+                      'blendongrid=navipy.sensors.blend_ongrid:main',
+                      'blendoverlaytraj=navipy.sensors.blend_overlaytraj:main'
+                  ]},
+              }
 
 setup(**setup_dict)