[Paraview] Question on Multiple Ports in Custom Reader (repost from developer list)

[Utkarsh Ayachit]

Can you post you reader's code? It might make things easier.

Utkarsh

On Fri, Jul 6, 2012 at 12:15 PM, Joshua Murphy
<Joshua.Murphy at lasp.colorado.edu> wrote:
> Hello all,
>
> I am still struggling with this problem, so I figured I would re-post the
> question to the general list in hopes of getting a wider audience!
>
> Thanks in advance for any help you may provide!
>
> For Completeness, I have verified that I am setting the number of output
> ports in my constructor.
>
> Thanks again for any help!
>
> -Joshua Murphy
>
> Laboratory for Atmospheric and Space Physics
>
> University of Colorado, Boulder
>
>
>
>
> Hello,
>
>
>
> I am attempting to write a reader that handles both structured grids and
> meta-data.  It was recommended to me that I use multiple ports, and populate
> a vtkTable with the meta-data.
>
>
>
> I think I am having some conceptual problems with how this is supposed to
> work.
>
>
>
> I have written a dummy reader in an attempt to get the meta-data working
> prior to porting it to my real reader, but I am having trouble…
>
>
>
> My understanding is that I need to
>
>
>
> specify the number of output ports with this->SetNumberOfOutputPorts(2)
> Populate the output port information
>
> int vtkGenericReader::FillOutputPortInformation(int port, vtkInformation*
> info)
>
> {
>
>   switch(port)
>
>     {
>
>     case 0:
>
>       info->Set(vtkDataObject::DATA_TYPE_NAME(), "vtkStructuredGrid");
>
>       break;
>
>     case 1:
>
>       info->Set(vtkDataObject::DATA_TYPE_NAME(), "vtkTable");
>
>       break;
>
>     }
>
>   return 1;
>
> }
>
>
>
> 3. Get the informationObject from the outputVector
>
>    outputvector->GetInformationObject(1);
>
>
>
> 4. Get the table data
>
>      this->MetaData = dynamic_cast<vtkTable*>
>
>       (this->MetaDataOutInfo->Get(vtkDataObject::DATA_OBJECT()));
>
>
>
> 5. Add string to the table
>
>
>
>   vtkStringArray *MetaString = vtkStringArray::New();
>
>   MetaString->SetName("Meta Data");
>
>   MetaString->SetNumberOfComponents(1);
>
>   MetaString->InsertNextValue("This is a Test");
>
>   MetaString->InsertNextValue("Test 2");
>
>   MetaString->InsertNextValue("Test 3");
>
>   this->MetaData->AddColumn(MetaString);
>
>
>
>
>
> It is my understanding that this information should then be available in the
> ParaView GUI.
>
>
>
>
>
> The problems I am having are this:
>
>
>
> 1.  When attempting to get both port information objects on the first call
> to RequestInformation(), port 1 returns a NULL object.  On the SECOND call
> to GetInformation(), both ports are available.
>
>
>
> 2.  All calls to RequestData() only provide access to port 0 in the Output
> information Vector.  I can access port 1 if I utilize
> this->getExecutive()->getOutputInformation(1)
>
>
>
> 3.  When using #2 to get the information, I populate, but I am unsure
> where/how things are supposed to be accessible in the GUI.
>
>
>
>
>
> What I am trying to do is be able to access the meta-data values from within
> ParaView so that I can utilize data values, units, model run data, etc.
>
>
>
> If anyone can help me understand what is supposed to be going on, or if I am
> completely doing something wrong, I would be grateful!  Am I missing some
> steps? Do I need to have XML code to access the vtkTable?
>
>
>
>
>
> Thanks,
>
>
>
> Joshua Murphy
>
> Laboratory for Atmospheric and Space Physics
>
> University of Colorado, Boulder
>
>
>
>
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