ParaView-5.0.1: Added the source-tree to ThirdParty-dev and patched as described in the README file

Resolves bug-report http://bugs.openfoam.org/view.php?id=2098

ParaView-5.0.1/VTK/Examples/Tutorial/Step2/Python/Cone2.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python
+#
+#
+# This example shows how to add an observer to a Python program. It extends
+# the Step1/Python/Cone.py Python example (see that example for information on
+# the basic setup).
+#
+# VTK uses a command/observer design pattern. That is, observers watch for
+# particular events that any vtkObject (or subclass) may invoke on
+# itself. For example, the vtkRenderer invokes a "StartEvent" as it begins
+# to render. Here we add an observer that invokes a command when this event
+# is observed.
+#
+
+from __future__ import print_function
+import vtk
+import time
+
+#
+# define the callback
+#
+def myCallback(obj,string):
+    print("Starting a render")
+
+
+#
+# create the basic pipeline as in Step1
+#
+cone = vtk.vtkConeSource()
+cone.SetHeight( 3.0 )
+cone.SetRadius( 1.0 )
+cone.SetResolution( 10 )
+
+coneMapper = vtk.vtkPolyDataMapper()
+coneMapper.SetInputConnection( cone.GetOutputPort() )
+coneActor = vtk.vtkActor()
+coneActor.SetMapper( coneMapper )
+
+ren1= vtk.vtkRenderer()
+ren1.AddActor( coneActor )
+ren1.SetBackground( 0.1, 0.2, 0.4 )
+
+#
+# Add the observer here
+#
+ren1.AddObserver("StartEvent", myCallback)
+
+renWin = vtk.vtkRenderWindow()
+renWin.AddRenderer( ren1 )
+renWin.SetSize( 300, 300 )
+
+#
+# now we loop over 360 degreeees and render the cone each time
+#
+for i in range(0,360):
+    time.sleep(0.03)
+    renWin.Render()
+    ren1.GetActiveCamera().Azimuth( 1 )
+