I believe you are referring to the newer Exodus file reader.  The 
ParaView/VTK/Hybrid/vtkExodusIIReader* source files implement that.

The Exodus II reader outputs unstructured grids in a multiblock data set.  Face 
and edge data are handled by creating new blocks with lines for edges and 
polygons for faces.  It makes it straightforward to store line and edge data as 
cell data in these special blocks, but it is difficult to restore the 
topological relationships between the faces, edges, and the cells they come 
from.

-Ken

   ****      Kenneth Moreland
    ***      Sandia National Laboratories
***********
*** *** ***  email: [email protected]
**  ***  **  phone: (505) 844-8919
    ***      web:   http://www.cs.unm.edu/~kmorel

From: papa ndéné NDIAYE <[email protected]<mailto:[email protected]>>
Date: Thu, 31 Mar 2011 12:13:20 +0200
To: <[email protected]<mailto:[email protected]>>
Subject: [Paraview] Dave Thomposon's reader

Hi,

I'm trying to develop a reader for aeronautic data visualization and need to 
handle boundary data. Searching for an example I wanted to know if the source 
code of the new Dave thomposon's reader, handling edges and faces available?

Best regards,
papa
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