[vtkusers] how to connect between vtkDataObject and vtkunstructuredGrid?

[LM]

I would like to ask some small question..
  
I have the output of the threshold filter "unstructuredGrid"
and the MarchingCubes take input of type "vtkDataObject" which is a super class of the "vtkunstructuredGrid"
  how to connect between them??? 
  means.. that i want to get the output of the threshold filter.. and input it into the marchingCubes..
   
  thanks in advance

  LM

		
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