[Gmsh] problems with postprocessing format ($NodeData section)

[Paulo Vieira]

Hello all,

I'm having some problems in understanding the postprocessing sections of
Gmsh's native file format (section 9 of the manual,
http://geuz.org/gmsh/doc/texinfo/gmsh-full.html#SEC62 ).

Consider this simple handmade example constituted by 6 nodes and 2 elements
(see the attached file, or at the bottom of the
message).

The mesh sections are fine ($Nodes, $Elements). Now I want to add a
$NodeData section. The example I made doesn't read if
the $NodeData section is present ("Filling PViewDataGModel... Could not read
data in msh file" - see the log attached).

Questions:

1- Do the string tags need to have a "" (or '') ?

2- According to the manual,

"By default the first string-tag is interpreted as the name of the
post-processing view, and the second as the name of the
interpolation scheme."

 Is this second tag mandatory? Where can I find more information about the
interpolation schemes available?

3- What is the purpose of the real-tags in the postprocessing sections?


It seems the problem with my example is related to one or more of these
issues, but I don't know what to do. I think a
simple example in the manual would make things much clearer.

Thanks for your help.

Paulo



$MeshFormat
2.0 0 8
$EndMeshFormat

$Nodes
6
1 0 0 0
2 1 0 0
3 1 1 0
4 0 1 0
5 2 0 0
6 2 1 0
$EndNodes

$Elements
2
1 3 0 1 2 3 4
2 3 0 2 5 6 3
$EndElements

$NodeData
1
"a_string_tag"
1
0
4
1
2
6
1
1 0.0 0.0
2 0.3 0.1
3 0.3 0.2
4 0.0 0.0
5 0.5 0.2
6 0.6 0.4
$EndNodeData
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