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

Wed Jul 13 11:25:50 EDT 2016

Corinna,

It seems that your use case is not currently supported. T.J. (CC'ed)
is working on a bug fix in ParaView that should enable what you are
doing.

https://gitlab.kitware.com/paraview/paraview/merge_requests/404

He can fill you in with more details if you need.

Thanks,
Cory

On Wed, Jul 13, 2016 at 2:13 AM, corinna reuter
<corinnareuter75 at gmail.com> wrote:
> Hi Cory,
> can you still help me to find the problem, why the custom vtkTest source
> cannot be produced inside paraview, but fails with a vtkPVPostFilter message
> (see subject)? A complete test was attached to my previous email.
>
> Why does vtkPVPostFilter expect vtkPolyData input, although both in the
> Servermanager xml and in FillOutputPortInformation the type is correctly
> given as vtkTest? Is there another place, where I need to define the output
> type?
>
> I also tried to make use of the vtkTableReader, but I can't seem to make it
> work, because it tries to read point data, cell data etc., which don't exist
> a priori in my use case.
>
> Corinna
>
>
> On Fri, Jul 8, 2016 at 10:03 AM, corinna reuter <corinnareuter75 at gmail.com>
> wrote:
>>
>> 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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>>>> >
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>>>> >
>>>>
>>>>
>>>>
>>>> --
>>>> Cory Quammen
>>>> R&D Engineer
>>>> Kitware, Inc.
>>>
>>>
>>
>

-- 
Cory Quammen
R&D Engineer
Kitware, Inc.