[Paraview] plugin error: "Input for algorithm vtkPVPostFilter is of type ..., but a vtkPolyData is required"

[Cory Quammen]

Hi Corinna,

Does vtkTestSource override the FillOutputPortInformation() member
function? It should look like

//----------------------------------------------------------------------------
int vtkTestSource::FillOutputPortInformation(
  int vtkNotUsed(port), vtkInformation* info)
{
  // now add our info
  info->Set(vtkDataObject::DATA_TYPE_NAME(), "vtkTest");
  return 1;
}

If that doesn't fix the error, let us know.

You may run into other problems with a custom data object - you may
want to derive your vtkTest class from one of the vtkDataObject
ParaView works with, e.g., vtkTable.

Thanks,
Cory

On Thu, Jul 7, 2016 at 1:44 AM, corinna reuter
<corinnareuter75 at gmail.com> wrote:
> Doesn't anybody know, why a vtkAlgorithm which produces a custom class
> (vtkTest) that is not derived from vtkDataSet show the error "... but a
> vtkPolyData is required"?
>
> A side remark, previously I wrote that the custom class "vtkTest" is neither
> derived from vtkDataSet nor from vtkDataObject. Actually it is derived from
> vtkDataObject.
>
> If my question doesn't make sense, please let me know. Maybe it is against
> every paraview design, so that I'll have to find a completely different
> solution. But it becomes more and more urgent for me to include a data
> source (mySQL database) of custom classes (not vtkDataSets) in the paraview
> tree.
>
> Thank you
> Corinna
>
> On Mon, Jul 4, 2016 at 3:09 PM, corinna reuter <corinnareuter75 at gmail.com>
> wrote:
>>
>> To anybody experienced in plugin programming:
>>
>> I am trying to include items in the paraview tree, which are not derived
>> from vtkDataSet or vtkDataObject. For example, a mySQL database should be
>> allowed as a data source, which delivers data in an intermediate format.
>> Next I'd implement filters which take the intermediate format and produce
>> vtkDataSets as output.
>>
>> Is it possible to use such "abstract" (not vtkDataSet) objects in the
>> paraview tree as a representation of the intermediate format? I have tried
>> to integrate the example for custom classes from
>> http://www.vtk.org/Wiki/VTK_Examples_vtkAlgorithm_Source into a paraview
>> plugin (CMakeLists and servermanager xml below). When the plugin is loaded
>> and I add a source of the new type AlgorithmSourceExample, this error is
>> thrown:
>>
>> ERROR: In
>> /opt/ParaView-v5.0.1/VTK/Common/ExecutionModel/vtkDemandDrivenPipeline.cxx,
>> line 810
>> vtkPVPostFilterExecutive (0x3857810): Input for connection index 0 on
>> input port index 0 for algorithm vtkPVPostFilter(0x3858910) is of type
>> vtkTest, but a vtkPolyData is required.
>>
>> What do I need to change such that the vtkTest objects, produced by
>> AlgorithmSourceExample, can live in the paraview tree?
>>
>> Thank you
>> Corinna
>>
>> CMakeLists.txt:
>>
>> FIND_PACKAGE(ParaView REQUIRED)
>> INCLUDE(${PARAVIEW_USE_FILE})
>> #changes required in
>> http://www.vtk.org/Wiki/VTK_Examples_vtkAlgorithm_Source:
>> # remove vtkCxxRevisionMacro calls
>> # change vtkTypeRevisionMacro into vtkTypeMacro
>> # remove call output->SetPipelineInformation( outInfo );
>>  ADD_PARAVIEW_PLUGIN(
>>    AlgorithmSourceExample
>>   "1.0"
>>    SERVER_MANAGER_XML AlgorithmSourceExample.xml
>>    SERVER_MANAGER_SOURCES vtkTestSource.cxx vtkTest.cxx
>>  )
>>
>> AlgorithmSourceExample.xml:
>>
>> <ServerManagerConfiguration>
>>   <ProxyGroup name="sources">
>>    <SourceProxy name="AlgorithmSourceExample" class="vtkTestSource"
>> label="AlgorithmSourceExample">
>>      <Documentation
>>         long_help="AlgorithmSourceExample"
>>         short_help="AlgorithmSourceExample">
>>      </Documentation>
>>    </SourceProxy>
>>  </ProxyGroup>
>> </ServerManagerConfiguration>
>
>
>
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-- 
Cory Quammen
R&D Engineer
Kitware, Inc.