[Libmesh-users] UNV format description?

[Karen L. <kyl...@gm...>]

Dear Libmesh users and developers,

I'm trying to import an unstructured 3D tetrahedral mesh (with which there
is data associated with the nodes) into libmesh. I looked at example 12 and
decided to massage my data into .unv format (currently in .vtu and .tec). I
searched all over the internet to look for specific descriptions of UNV, to
no avail, except finding out that you can put several types of data in a
file:
http://www.amiravis.com/documentation/521/amira/hxideas/HxFileFormat_IDEAS.html

I looked at the only example I could find (ex8/pipe-mesh.unv), and I'm not
sure what to make of it:
-1
  2411
         1         1         1        11
   1.9999999999999995D-01   3.7007434154171882D-17   4.0000000000000000D+00
         2         1         1        11
   1.0000000000000001D-01   0.0000000000000000D+00   4.0000000000000000D+00
         3         1         1        11
   1.0000000000000001D-01   9.9999999999999977D-02   4.0000000000000000D+00
         4         1         1        11
   1.9999999999999998D-01   9.9999999999999977D-02   4.0000000000000000D+00
.....
    3977         1         1        11
  -4.0000000000000002D-01  -2.9999999999999965D-01   1.5661120000000004D-06
    -1
    -1
  2412
        23       115         2         1         7         8
         1         2         3         4        31        71       111
151
        24       115         2         1         7         8
        31        71       111       151        32        72       112
152
        25       115         2         1         7         8
        32        72       112       152        33        73       113
153
        26       115         2         1         7         8
        33        73       113       153        34        74       114
154
        27       115         2         1         7         8
...
3775      3535      3615      3776      3536      3616
      3542       112         2         1         7         6
      3776      3536      3616      3777      3537      3617
    -1



Is this "-1" an indicator of the start and end of sections? I figure the
2411 and 2412 indicate the data type to come, but I have no idea what the 1
1 1 11 is in the nodes section. I suppose the first would be a node number,
since it becomes 2, 3, 4, etc in subsequent lines. Neither do I get what any
of the numbers are doing in the 2412 section. And am I correct in assuming
that there's no data associated with the  nodes, since there's no 2414
section? And by the way, are the D-01's just short for X 10^{-1}? (usually
written as E-01 instead of D-01)

Clarifications would be greatly appreciated. Alternatively, I guess there's
a way to read in file with node data for tecplot and vtu formats, even
though example 12 only deals with UNV?

Thanks,
Karen