[vtkusers] Cannot recover user defined vtkInformation from vtkUnstructuredGrid

[David Gobbi]

Before you load the data, re-make the keys so that VTK will register them
as valid keys:

quantity_key = keys.MakeKey(vtk.vtkInformationStringKey, "Quantity", "1")
increment_key = keys.MakeKey(vtk.vtkInformationIntegerKey, "Increment", "2")
# the keys are defined now, so you should be able to load the data


On Sun, Dec 3, 2017 at 4:00 PM, scotsman60 <doug at beachmailing.com> wrote:

> Hello!!
>
> I'm using the Python API to vtk and I'm unable to import custom
> vtkInformation from a vtkUnstructuredGrid.
>
> First of all I'm associating custom information to CellData in a
> vtkUnstructuredGrid using the following code - where self.mesh is the
> vtkUnstructuredGrid
>
>     #Add the information keys
>     info = densityScalars.GetInformation()
>
>     # First the Quantity type
>     quantity_key = keys.MakeKey(vtk.vtkInformationStringKey, "Quantity",
> "1")
>     quantity_key.Set(info, "Topology Density")
>
>     #Now the Increment number
>     increment_key = keys.MakeKey(vtk.vtkInformationIntegerKey,
> "Increment",
> "2")
>     increment_key.Set(info, increment)
>
>
>     #Add the array to the mesh
>     self.mesh.GetCellData().AddArray(densityScalars)
>
>
> Later I save the vtkUnstructuredGrid using vtkUnstructuredGridWriter, then
> Import it into a new Python session (Basically my program uses the
> vtkUnstructuredGrid as its persistence mechanism.........)
>
> When I read the grid using vtkUnstructuredGridReader I get a whole bunch of
> warnings from vtk
>
>     Warning: In ..\IO\Legacy\vtkDataReader.cxx, line 2668
>     vtkUnstructuredGridReader (00000000044D7520): Could not locate key
> 2::Increment. Is the module
>     in which it is defined linked?
>
>     Warning: In ..\IO\Legacy\vtkDataReader.cxx, line 2907
>     vtkUnstructuredGridReader (00000000044D7520): Ignoring line in
> INFORMATION block: DATA 1
>
>     Warning: In ..\IO\Legacy\vtkDataReader.cxx, line 2668
>     vtkUnstructuredGridReader (00000000044D7520): Could not locate key
> 2::Increment. Is the module
>     in which it is defined linked?
>
>     Warning: In ..\IO\Legacy\vtkDataReader.cxx, line 2907
>     vtkUnstructuredGridReader (00000000044D7520): Ignoring line in
> INFORMATION block: DATA 2
>
>     Warning: In ..\IO\Legacy\vtkDataReader.cxx, line 2668
>     vtkUnstructuredGridReader (00000000044D7520): Could not locate key
> 1::Quantity. Is the module in
>     which it is defined linked?
>
>     Warning: In ..\IO\Legacy\vtkDataReader.cxx, line 2907
>     vtkUnstructuredGridReader (00000000044D7520): Ignoring line in
> INFORMATION block: DATA
>     Topology%20Density
>
>
> Any ideas on what's going on here?
>
> Thanks in advance,
>
> Doug
>
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