[Paraview] Exodus multiblock dataset block numbers vs block IDs

[Dennis Conklin]

All,

I'm trying to retrieve the block names for blocks in an Exodus multi-block dataset.     There is a weird block_ID, block_number thing which I don't understand and can't get past.

Imagine I have many blocks in my dataset but I only load 2

   Block_ID         block_number(displayed in Spreadsheet)
          4                    5                               - this is actually 4th block in file
      101                 25                                - this is actually 24th block in file

I am looping through blocks and getting block_names using this routine:

    def get_block_name(block):
       #
       # Get block ID - indexed from 1
       block_id=block.FieldData.GetArray('ElementBlockIds')
       #print block_id
       #
       #  Get Block name from metadata
       output=self.GetOutput()
       #
       # Element Block data is in DataBlock(0) of composite database
       ElementBlocks=output.GetBlock(0)
       #
       # meta indexed from 0 (use block_id-1)
       block_meta=ElementBlocks.GetMetaData(block_id-1)
       block_name=block_meta.Get(vtk.vtkCompositeDataSet.NAME())
       return block_name


Note that block.FieldData.GetArray('ElementBlockIds') returns 5 for the first block
I then need to call block_meta.Get(vtk.vtkCompositeDataSet.NAME()) with 4 to get the correct name

Now with the second block, block.FieldData.GetArray('ElementBlockIds') returns 101,
I then call block_meta.Get(vtk.vtkCompositeDataSet.NAME()) with 100 and get an error of "NoneType object has no attribute 'Get'
It seems clear that I need a function which will return 25 for the second block (instead of 101) so that I can call NAME() with 24.

So, how do I get it to return the block number instead of the block ID

NOTE,  the first block is a hex block, while the 2nd block is a quad block - I'm suspicious that this is the real issue, but here all quad blocks are > 100 by convention.

Summary - block name works for contiguously numbered hex blocks but discontinuously numbered quad blocks don't work.

Thanks for any help.

Dennis

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