[Paraview] Extract Block from MultiBlock into vtkImageData

[Michael Jackson]

Is there a pipeline that would allow me to extract a block from a  
MultiBlock data set and end up with the "native type" of vtk object  
that the block represents?

I have a custom reader that reads data from an HDF5 file and outputs  
vtkMultiBlockDataset. I then use the "ExtractBlock" filter to pull out  
a specific data set. The type of data is a Uniform Rectilinear Grid  
that is store in the block. After the ExtractBlock the extracted data  
is still listed as MultiBlock. I then run some filters (Extract  
Surface) that generates PolyData. I would now like to "AppendDatasets"  
but the filter is not available because I am assuming that the filter  
does not like the vtkMultiBlockDataset that are produced from all the  
other steps.

   I am thinking of a filter such that the input is a  
MultiBlockDataset and the output is a vtkImage, or vtkPolyData or  
something like that.

Thanks for any help.

this is on ParaView 3.8.0 RC1, OS X 10.5.8, Qt 4.6.2 Cocoa.
___________________________________________________________
Mike Jackson                      www.bluequartz.net
Principal Software Engineer       mike.jackson at bluequartz.net
BlueQuartz Software               Dayton, Ohio