Hi Chris,
a unstructured grid (without polyhedral cells) is described by three arrays:
1) connectivity: An array storing the point ids of the unique points of
all cells.
2) offsets: An array indicating the end position of each cell in the
connectivity array.
3) types: An array storing the types of each cell.
Regarding your example, from the "types" and "offsets" arrays you can
deduct that you have 4 cells of type "12", i.e. hexahedrons (see [1]).
Now, the offsets array tells you that the first 8 numbers in the
connectivity array are the point ids for the first cell, second number
tells you that the point ids from 9 to 16 are for the second cell and so on.
The line breaks in the connectivity array have no meaning.
HTH,
Armin
[1]
https://gitlab.kitware.com/vtk/vtk/blob/master/Common/DataModel/vtkCellType.h
On 08/24/2016 07:50 PM, Christopher Neal wrote:
Hi All,
Does anyone have a link to an example or documentation describing how
one can interpret a *.vtu file that is XML ascii? I’m looking at a file
that was written for a 2x2x1 group of cells i.e. 4 hexahedral cells, and
the connectivity looks like:
<Cells>
<DataArray type="Int64" Name="connectivity" format="ascii"
RangeMin="0" RangeMax="17">
0 6 8 2 1 7
9 3 2 8 10 4
3 9 11 5 6 12
14 8 7 13 15 9
8 14 16 10 9 15
17 11
</DataArray>
<DataArray type="Int64" Name="offsets" format="ascii"
RangeMin="8" RangeMax="32">
8 16 24 32
</DataArray>
<DataArray type="UInt8" Name="types" format="ascii"
RangeMin="12" RangeMax="12">
12 12 12 12
</DataArray>
</Cells>
I can’t seem to understand the connectivity info that is displayed. I
would image there should be 8 entries per line for a hexahedral cell.
Any material on this would be greatly appreciated.
Thank you,
Chris Neal
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