class TpFcObject():						
										
  ''' Description '''	
										
  def __init__(self, obj):							
										
      ''' call self.setProperties '''						
      self.setProperties(obj)							
      obj.ViewObject.Proxy=0							
      return None								
			
										
  def setProperties(self, fp):							
										
      ''' Add self.properties '''						
      fp.Proxy = self								
      if not hasattr(fp,"SourceObject"):																						
          fp.addProperty("App::PropertyLink","SourceObject","xxx","yyy")

      if not hasattr(fp,"output1"):
          fp.addProperty('Part::PropertyPartShape', 'output1', 'vert_faces', "xxx"),8)
      if not hasattr(fp,"output2"):
          fp.addProperty('Part::PropertyPartShape', 'output2', 'hor_faces', "xxx"),8)


  def execute(self, fp):							
										
      ''' Features to Run (extract codes from your exsiting library)'''			

      # algorithm to find the external vertical faces ...etc.
      inputShape = fp.SourceObject.Shape
      ...
      fp.output1 = output1
      fp.output2 = output2
      ...
      fp.Shape = (can chose to 'display' which output, e.g. depends on a switch)
     

# make a FreeCAD 'document object'
tpObj = FreeCAD.ActiveDocument.addObject("Part::FeaturePython","TpObj")											

# 'apply' the class / create an TpFcObject 'instance' passing the 'document object' to it
tpObjInstance = TpFcObject(tpObj)																		

# pass the selected obj to the Topologic Object for execution
tpObj.SourceObject = Gui.Selection.getSelection()[0]