[vtkusers] how to attach multi-attributes to the same dataset?

[April.Q]

Thanks David E DeMarle, it works.
Now i get many StructuredGrids , all of them has two attributes scalar_1 and
scalar_2. 
Then i use these StructuredGrids build a vtkMultiBlockDataset. 
I want to render these vtkMultiBlockDataset and find one topic about it ,and
see your advice .
How to tell the filter to operate on a specific array(eg. only render a
slice of scalar_2)??Tell which filter ??

I use python ,and i do like this:

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

     compositeFilter = vtk.vtkCompositeDataGeometryFilter()
     compositeFilter.SetInput(MyMultiBlockDataset)
     compositeFilter.Update()

     colors = vtk.vtkImageMapToColors() 
     colors.SetInputConnection(compositeFilter.GetOutputPort()) 
     colors.SetLookupTable(MyLookupTable) 
     colors.Update() 

     imageReslice = vtk.vtkImageReslice()
     imageReslice.SetInput(colors.GetOutput())

     sliceMapper = vtk.vtkImageMapper()        
     sliceMapper.SetInputConnection(imageReslice.GetOutputPort())      
 
     sliceActor = vtk.vtkActor()
     sliceActor.SetMapper(sliceMapper)  
#ValueError: method requires a vtkMapper, a 
#  vtkOpenGLImageMapper was provided.
     
     renderer...
     renWin...
     iren...
      ... ...

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