diff --git a/doc/source/blender_run.py b/doc/source/blender_run.py
index 8b7c1518f802a38096e753cfea526090d17f457c..26849d24aaa72cc51233361d41d44ed2af65a233 100644
--- a/doc/source/blender_run.py
+++ b/doc/source/blender_run.py
@@ -4,8 +4,8 @@ Run several blender instances if blender is installed
 import pkg_resources
 import glob
 import os
-import shutil
 import sys
+import shutil
 import inspect
 import tempfile
 
@@ -18,8 +18,8 @@ def activate_virtualenv(venv_path):
         exec(f.read(), dict(__file__=filepath))
 
 
-venv = sys.base_prefix
-print(venv)
+venv_path = sys.base_prefix
+
 blendercomand = shutil.which('blender')
 worldfile = pkg_resources.resource_filename(
     'navipy', 'resources/forest_world.blend')
@@ -29,7 +29,7 @@ for demofile in glob.iglob('**/blenddemo*.py', recursive=True):
         tfile.write('import os \n'.encode(encoding))
         for line in inspect.getsourcelines(activate_virtualenv)[0]:
             tfile.write(line.encode(encoding))
-        line = 'activate_virtualenv(\"{}\")\n'.format(venv)
+        line = 'activate_virtualenv(\"{}\")\n'.format(venv_path)
         tfile.write(line.encode(encoding))
         with open(demofile) as infile:
             for line in infile:
diff --git a/navipy/rendering/__init__.py b/navipy/rendering/__init__.py
index 5c237d757ec0a290b2736d3c9674afb09d42aba1..294345fcc7b702e5f4afefcd0c5264daebfe7dc9 100644
--- a/navipy/rendering/__init__.py
+++ b/navipy/rendering/__init__.py
@@ -15,13 +15,16 @@ Blender comes with its own python installation. Thus, we need to \
 tell blender to use our virtualenv where the navigation toolbox \
 is installed. To do we need to import the os module
 
-.. literalinclude:: example/rendering/blenddemo_beesampling.py
-    :lines: 5 - 6
+.. literalinclude:: blender_run.py
+    :lines: 6 - 7
 
-then activate the environment:
+then activate the environment by using the following function:
 
-.. literalinclude:: example/rendering/blenddemo_beesampling.py
-    :lines: 12 - 26
+.. literalinclude:: blender_run.py
+    :lines: 13 - 18
+
+here venv_path is the path to the virtual environment within which \
+navipy has been installed.
 
 Now, blender can import all modules used by the navigation toolbox.
 
@@ -39,13 +42,9 @@ Custom sampling
 
 Rendering classes
 -----------------
-BeeSampling
-~~~~~~~~~~~
 .. autoclass:: navipy.rendering.bee_sampling.BeeSampling
     :members:
 
-Cyberbee
-~~~~~~~~
 .. autoclass:: navipy.rendering.cyber_bee.Cyberbee
     :members:
 """
diff --git a/navipy/rendering/bee_sampling.py b/navipy/rendering/bee_sampling.py
index 5245b5c3aad05ad0242148bc641244e67f4eb539..bdcc0e06a6dc3e427c604e97f733d7097f13a28e 100644
--- a/navipy/rendering/bee_sampling.py
+++ b/navipy/rendering/bee_sampling.py
@@ -6,10 +6,10 @@ With the toolbox at disposition we just need to configure the \
 BeeSampling to render images on a regular 3D grid.
 
 .. literalinclude:: example/rendering/blenddemo_beesampling.py
-   :lines: 34
+   :lines: 9
 
 .. literalinclude:: example/rendering/blenddemo_beesampling.py
-   :lines: 37-44
+   :lines: 12-19
 
 If we want to use the distance to objects, we need to tell the \
 BeeSampling what is the maximum distance to objects in the environment.\
@@ -18,13 +18,12 @@ compressed in the database, all distance to object will be equal to \
 zero:
 
 .. literalinclude:: example/rendering/blenddemo_beesampling.py
-   :lines: 48-49
+   :lines: 23-24
 
 Finally we can generate the database.
 
 .. literalinclude:: example/rendering/blenddemo_beesampling.py
-   :lines: 53-54
-
+   :lines: 28-29
 """
 import warnings
 try:
@@ -42,13 +41,7 @@ from navipy.database import DataBaseSave
 
 class BeeSampling(Cyberbee):
     """
-    BeeSampling is a class deriving from Cyberbee.
-    The BeeSampling can be used to generate a database of
-images taken on a rectangular regular grid. For the database,
-the BeeSampling rely on DataBase
-    It worth noting that the generated database can take a large
-harddrive space, as each image is composed of 4 channels of 180x360 pixels.
-
+    BeeSampling allows to create a DataBase using Cyberbee as the renderer.
     """
 
     def __init__(self):
diff --git a/navipy/rendering/cyber_bee.py b/navipy/rendering/cyber_bee.py
index 1c9ad25303290fb6c4bf12906360b9d96abdbccd..877c99cfc291e45357dbb3f3b9c40f899cc57c36 100644
--- a/navipy/rendering/cyber_bee.py
+++ b/navipy/rendering/cyber_bee.py
@@ -1,5 +1,17 @@
 """
- BLA
+.. literalinclude:: example/rendering/blenddemo_cyberbee.py
+   :lines: 1-2
+
+With the toolbox at disposition we just need to configure the \
+Cyberbee to render images at desired positions.
+
+.. literalinclude:: example/rendering/blenddemo_cyberbee.py
+   :lines: 7-8
+
+To render a scene at a given positions we just have to do:
+
+.. literalinclude:: example/rendering/blenddemo_cyberbee.py
+   :lines: 9-10
 
 """
 import warnings
@@ -93,25 +105,11 @@ class Cyberbee():
         return bpy.data.scenes["Scene"].camera.rotation_mode
 
     @camera_rotation_mode.setter
-    def camera_rotation_mode(self, mode='XYZ'):
+    def camera_rotation_mode(self, mode):
         """change the camera rotation mode
-
-
-
-        :param mode: the mode of rotation for the camera see blender doc
-
-                     (default: 'XYZ').
-
+        :param mode: the mode of rotation for the camera see blender do
         :type mode: a string
-
         .. seealso: blender bpy.data.scenes["Scene"].camera.rotation_mode
-
-
-
-        ..todo: Use @property.setter
-
-                    def camera_rotation_mode(self, mode='XYZ')
-
         """
         if not isinstance(mode, str):