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

[corinna reuter]

Hi Cory,
I attach the complete sources for compiling and testing the described
problem.
(Tested with Paraview 5.0.1 compiled from sources.)

Corinna

On Thu, Jul 7, 2016 at 7:31 PM, corinna reuter <corinnareuter75 at gmail.com>
wrote:

> Yes, FillOutputPortInformation already looks exactly as you say.
>
> I gave the link to the complete example code in my initial question:
> http://www.vtk.org/Wiki/VTK_Examples_vtkAlgorithm_Source
> I changed a few lines to make it compile with Paraview 5.0.1 (see the
> comments in the CMakeLists.txt with my initial question). In addition, I
> can send to you tomorrow a small source archive ready for compilation.
>
> I'll also check vtkTable to see if it solves my problem. I thought of just
> deriving the vtkTest class from vtkDataSet and returning a fake, empty
> dataset while keeping the information from which the actual vtkDataSet will
> be processed downstream in the pipeline. Do you think that this workaround
> is feasible, or what other problems should I excpect?
>
> Thank you
> Corinna
>
>
> On Thu, Jul 7, 2016 at 3:03 PM, Cory Quammen <cory.quammen at kitware.com>
> wrote:
>
>> 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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>> >
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>> >
>> > Please keep messages on-topic and check the ParaView Wiki at:
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>> >
>>
>>
>>
>> --
>> Cory Quammen
>> R&D Engineer
>> Kitware, Inc.
>>
>
>
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