[Paraview] Undefined variables in Ensight Gold Format

[Martin Küttler]

> I too looked at this and found that 'undef' is handled in the ASCII format,
> but not in the binary format. This could the source of your problem.
> Fortunately, a small hack to the binary reader should not be too difficult
> to add.
>
Hi Mark,

In ASCII format the file is read correctly, but I think the nodes with 
undefined values are not displayed the way they should. In fact, I don't see 
how the 'undef' keyword changes the displayed data at all.
I attached an example to show what I mean. The central node should have an 
undefined value, but its value is displayed just like that of any other node.

Unfortunately I don't know anything about VTK or how easy it is to add new 
cell types, so I can't help you there.

Regards,
Martin
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