diff --git a/README.md b/README.md
index 795b394..f857c16 100644
--- a/README.md
+++ b/README.md
@@ -34,10 +34,10 @@ logging.basicConfig(level = logging.INFO)
 import pyrealsense as pyrs
 
 ## start the service - also available as context manager
-pyrs.start()
+serv = pyrs.Service()
 
 ## create a device from device id and streams of interest
-cam = pyrs.Device(device_id = 0, streams = [pyrs.stream.ColorStream(fps = 60)])
+cam = serv.Device(device_id = 0, streams = [pyrs.stream.ColorStream(fps = 60)])
 
 ## retrieve 60 frames of data
 for _ in range(60):
@@ -46,7 +46,7 @@ for _ in range(60):
 
 ## stop camera and service
 cam.stop()
-pyrs.stop()
+serv.stop()
 ```
 
 The server for Realsense devices is started with `pyrs.start()` which will printout the number of devices available. It can also be started as a context with `with pyrs.Service():`.
diff --git a/docs/examples.rst b/docs/examples.rst
index 41a0684..e309847 100644
--- a/docs/examples.rst
+++ b/docs/examples.rst
@@ -1,10 +1,10 @@
 Examples
 ========
 
-Matplotlib based
-----------------
+with Matplotlib
+---------------
 
-::
+.. code-block:: python
 
     import logging
     logging.basicConfig(level=logging.INFO)
@@ -21,6 +21,172 @@ Matplotlib based
         plt.show()
 
 
-This example is using OpenCV.
+with OpenCV
+-----------
+
+.. code-block:: python
+
+    import logging
+    logging.basicConfig(level=logging.INFO)
+
+    import time
+    import numpy as np
+    import cv2
+    import pyrealsense as pyrs
+
+
+    with pyrs.Service() as serv:
+        with serv.Device() as dev:
+
+            dev.apply_ivcam_preset(0)
+
+            cnt = 0
+            last = time.time()
+            smoothing = 0.9
+            fps_smooth = 30
+
+            while True:
+
+                cnt += 1
+                if (cnt % 10) == 0:
+                    now = time.time()
+                    dt = now - last
+                    fps = 10/dt
+                    fps_smooth = (fps_smooth * smoothing) + (fps * (1.0-smoothing))
+                    last = now
+
+                dev.wait_for_frames()
+                c = dev.color
+                c = cv2.cvtColor(c, cv2.COLOR_RGB2BGR)
+                d = dev.depth * dev.depth_scale * 1000
+                d = cv2.applyColorMap(d.astype(np.uint8), cv2.COLORMAP_RAINBOW)
+
+                cd = np.concatenate((c, d), axis=1)
+
+                cv2.putText(cd, str(fps_smooth)[:4], (0, 50), cv2.FONT_HERSHEY_SIMPLEX, 2, (0, 0, 0))
+
+                cv2.imshow('', cd)
+                if cv2.waitKey(1) & 0xFF == ord('q'):
+                    break
+
+
+with VTK
+--------
+
+.. code-block:: python
+
+    import time
+    import threading
+
+    import numpy as np
+
+    import vtk
+    import vtk.util.numpy_support as vtk_np
+
+
+    import pyrealsense as pyrs
+    serv = pyrs.Service()
+    serv.start()
+    cam = serv.Device()
+
+
+    class VTKActorWrapper(object):
+        def __init__(self, nparray):
+            super(VTKActorWrapper, self).__init__()
+
+            self.nparray = nparray
+
+            nCoords = nparray.shape[0]
+            nElem = nparray.shape[1]
+
+            self.verts = vtk.vtkPoints()
+            self.cells = vtk.vtkCellArray()
+            self.scalars = None
+
+            self.pd = vtk.vtkPolyData()
+            self.verts.SetData(vtk_np.numpy_to_vtk(nparray))
+            self.cells_npy = np.vstack([np.ones(nCoords,dtype=np.int64),
+                                   np.arange(nCoords,dtype=np.int64)]).T.flatten()
+            self.cells.SetCells(nCoords,vtk_np.numpy_to_vtkIdTypeArray(self.cells_npy))
+            self.pd.SetPoints(self.verts)
+            self.pd.SetVerts(self.cells)
+
+            self.mapper = vtk.vtkPolyDataMapper()
+            self.mapper.SetInputDataObject(self.pd)
+
+            self.actor = vtk.vtkActor()
+            self.actor.SetMapper(self.mapper)
+            self.actor.GetProperty().SetRepresentationToPoints()
+            self.actor.GetProperty().SetColor(0.0,1.0,0.0)
+
+        def update(self, threadLock, update_on):
+            thread = threading.Thread(target=self.update_actor, args=(threadLock, update_on))
+            thread.start()
+
+        def update_actor(self, threadLock, update_on):
+            while (update_on.is_set()):
+                time.sleep(0.01)
+                threadLock.acquire()
+                cam.wait_for_frames()
+                self.nparray[:] = cam.points.reshape(-1,3)
+                self.pd.Modified()
+                threadLock.release()
+
+
+    class VTKVisualisation(object):
+        def __init__(self, threadLock, actorWrapper, axis=True,):
+            super(VTKVisualisation, self).__init__()
+
+            self.threadLock = threadLock
+
+            self.ren = vtk.vtkRenderer()
+            self.ren.AddActor(actorWrapper.actor)
+
+            self.axesActor = vtk.vtkAxesActor()
+            self.axesActor.AxisLabelsOff()
+            self.axesActor.SetTotalLength(1, 1, 1)
+            self.ren.AddActor(self.axesActor)
+
+            self.renWin = vtk.vtkRenderWindow()
+            self.renWin.AddRenderer(self.ren)
+
+            ## IREN
+            self.iren = vtk.vtkRenderWindowInteractor()
+            self.iren.SetRenderWindow(self.renWin)
+            self.iren.Initialize()
+
+            self.style = vtk.vtkInteractorStyleTrackballCamera()
+            self.iren.SetInteractorStyle(self.style)
+
+            self.iren.AddObserver("TimerEvent", self.update_visualisation)
+            dt = 30 # ms
+            timer_id = self.iren.CreateRepeatingTimer(dt)
+
+        def update_visualisation(self, obj=None, event=None):
+            time.sleep(0.01)
+            self.threadLock.acquire()
+            self.ren.GetRenderWindow().Render()
+            self.threadLock.release()
+
+
+    def main():
+        update_on = threading.Event()
+        update_on.set()
+
+        threadLock = threading.Lock()
+
+        cam.wait_for_frames()
+        pc = cam.points.reshape(-1,3)
+        actorWrapper = VTKActorWrapper(pc)
+        actorWrapper.update(threadLock, update_on)
+
+        viz = VTKVisualisation(threadLock, actorWrapper)
+        viz.iren.Start()
+        update_on.clear()
+
+
+    main()
+    cam.stop()
+    serv.stop()
+
 
-And this one is based on VTK.
\ No newline at end of file
diff --git a/examples/show_cv2.py b/examples/show_cv2.py
index c387030..6850a8a 100644
--- a/examples/show_cv2.py
+++ b/examples/show_cv2.py
@@ -40,5 +40,3 @@
             cv2.imshow('', cd)
             if cv2.waitKey(1) & 0xFF == ord('q'):
                 break
-
-        # dev.stop()