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

Wed Jul 13 02:13:53 EDT 2016

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>
>>> >
>>> >
>>> >
>>> > _______________________________________________
>>> > Powered by www.kitware.com
>>> >
>>> > Visit other Kitware open-source projects at
>>> > http://www.kitware.com/opensource/opensource.html
>>> >
>>> > Please keep messages on-topic and check the ParaView Wiki at:
>>> > http://paraview.org/Wiki/ParaView
>>> >
>>> > Search the list archives at: http://markmail.org/search/?q=ParaView
>>> >
>>> > Follow this link to subscribe/unsubscribe:
>>> > http://public.kitware.com/mailman/listinfo/paraview
>>> >
>>>
>>>
>>>
>>> --
>>> Cory Quammen
>>> R&D Engineer
>>> Kitware, Inc.
>>>
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/paraview/attachments/20160713/5cbc506d/attachment.html>