[vtkusers] how to render a MultiBlockDataSet ？

[April.Q]

 how to render a MultiBlockDataSet in only one
 renderWindow, not producing renderWindows for every leaf node .
         Renderer = vtk.vtkRenderer()
         Renderer.ResetCamera()
         Renderer.ResetCameraClippingRange ()

         renWin = vtk.vtkRenderWindow()
         renWin.AddRenderer(Renderer)

         iren = vtk.vtkRenderWindowInteractor()
         iren.SetRenderWindow(renWin)


         ##try to use iterator
         iterator = MyMultiBlockDataSet.NewIterator()
         iterator.InitTraversal()
         iterator.VisitOnlyLeavesOn()
         iterator.SkipEmptyNodesOn()
         iterator.GoToFirstItem()
         while not iterator.IsDoneWithTraversal():
             print " now idx:", iterator.GetCurrentFlatIndex()
             currentInput =
vtk.vtkStructuredGrid.SafeDownCast(iterator.GetCurrentDataObject())
             currentInput.GetPointData().SetActiveScalars("scalarvr")
             imageReslice = vtk.vtkImageReslice()
             imageReslice.SetInput(currentInput)
             iteratorMapper = vtk.vtkImageMapper()
             iteratorMapper.SetInputConnection(imageReslice.GetOutputPort())
             iterator.GoToNextItem()
             iteratorActor = vtk.vtkActor()
             iteratorActor.SetMapper( iteratorMapper )
             Renderer.AddViewProp( iteratorActor )
             Renderer.AddActor(iteratorActor)
         iren.Initialize()
         iren.Render()
         print "over!"
 What i got is only ErrorMessage:
   # iteratorActor.SetMapper( iteratorMapper ) #the error take place here
 TypeError: argument 1: method requires a vtkMapper, a vtkOpenGLImageMapper
 was provided.

 how to fix the problem? and how to render MultiBlockDataSet use
 compositedata filers and mappers and renders ?
 something like this:

         pipeline = vtk.vtkCompositeDataPipeline()
         algorithm = vtk.vtkAlgorithm()
         algorithm.SetExecutive(pipeline)
         algorithm.SetDefaultExecutivePrototype(pipeline)

         compositeFilter = vtk.vtkCompositeDataGeometryFilter()
         compositeFilter.SetInput(MyMultiBlockDataSet)
         compositeFilter.Update()
         imageReslice = vtk.vtkImageReslice()
         imageReslice.SetInput(compositeFilter.GetOutput() )
         sliceMapper = vtk.vtkImageMapper()
         sliceMapper.SetInputConnection(imageReslice.GetOutputPort())
         sliceMapper.SetInput(imageReslice.GetOutput())
         sliceActor = vtk.vtkActor()
         sliceActor.SetMapper( sliceMapper ) 
        # ErrorMessage:method requires a vtkMapper, a vtkOpenGLImageMapper
was provided.
         Renderer.AddActor(sliceActor)
         Renderer.SetActiveCamera(Camera)

         renWin.Render()
         iren.Initialize()
         iren.Start()


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