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

Thu Jul 14 10:25:10 EDT 2016

Thank you! After recompiling Paraview with that patch, the problem seems to
be solved.
Will the patch be automatically merged into the development version? And in
which future Paraview release can we expect to find it? (I don't understand
the details of the build robot's messages)

Corinna

On Wed, Jul 13, 2016 at 5:25 PM, Cory Quammen <cory.quammen at kitware.com>
wrote:

> 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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> >>>> >
> >>>> > Please keep messages on-topic and check the ParaView Wiki at:
> >>>> > http://paraview.org/Wiki/ParaView
> >>>> >
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> >>>> >
> >>>>
> >>>>
> >>>>
> >>>> --
> >>>> Cory Quammen
> >>>> R&D Engineer
> >>>> Kitware, Inc.
> >>>
> >>>
> >>
> >
>
>
>
> --
> Cory Quammen
> R&D Engineer
> Kitware, Inc.
>
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