[Paraview] Question on Information Objects

Joshua Murphy Joshua.Murphy at lasp.colorado.edu
Mon Apr 9 15:24:09 EDT 2012 

Hi Burlen,

I think I am getting there, but I am having the following problem now..

The following snippet from my RequestData is causing a segfault…


 vtkInformation *outInfo2 = outputVector->GetInformationObject(1);

 vtkTable *MetaDataOutput = vtkTable::SafeDownCast(outInfo2->Get(vtkDataObject::DATA_OBJECT()));

Am I grabbing the information object incorrectly, or do I need to override another method? Do I need to do something with RequestDataObject()?

If you can help, that would be great!

-Josh


From: Burlen Loring <bloring at lbl.gov<mailto:bloring at lbl.gov>>
Date: Mon, 9 Apr 2012 12:34:02 -0600
To: Joshua Murphy <joshua.murphy at lasp.colorado.edu<mailto:joshua.murphy at lasp.colorado.edu>>
Cc: burlen <burlen.loring at gmail.com<mailto:burlen.loring at gmail.com>>, "paraview at paraview.org<mailto:paraview at paraview.org>" <paraview at paraview.org<mailto:paraview at paraview.org>>
Subject: Re: [Paraview] Question on Information Objects

Hi Joshua,

In your constructor you'd need to call
this->SetNumberOfInputPorts(2);
You'd need to override
FillInputPortInformation(int port, vtkInformation *info)
implement a switch on port number and do something like:

 288   switch (port)
 289     {
 290     // Vector feild data
 291     case 0:
 292       info->Set(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkUnstructuredGrid");
 293       break;
 294     // Seed points
 295     case 1:
 296       info->Set(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkTable");
 297       break;
 398     }

in request data you have to grab the table from the second information object.

Hope this helps
Burlen



On 04/09/2012 11:01 AM, Joshua Murphy wrote:
Hello,

So I am trying to figure out how to add an output port to my Reader, but I am having difficulty.

I am trying to create the new output as outlined in the email below, but when I get to the point of adding the column to the table, ParaView segfaults.

Having looked through other emails on the list, it looks like the output ports need to be configured somehow, but I am not sure how to do that.

My reader creates a vtkStructuredGrid for the data, and I need to add the vtkTable for the meta-data… how do I configure the reader for these two outputs?


Currently, my getInformation (beginning) looks like this:
------------


  vtkInformation *outInfo = outputVector->GetInformationObject(0);

  vtkStructuredGrid *output = vtkStructuredGrid::SafeDownCast(

        outInfo->Get(vtkDataObject::DATA_OBJECT()));

  //TODO: Add Meta Data here first

  //      Use VTK Table output Port

  // Following is from discussion on ParaView Mailing List


  //-----------------------------------------------------------

  //  315   vtkInformation *outInfo;

  //  316   vtkTable *output;

  //  317   vtkStringArray *data;

  //  318

  //  319   // output port 1 -> bw data

  //  320   outInfo=outputVector->GetInformationObject(0);

  //  321   output

  //  322     = dynamic_cast<vtkTable*>(outInfo->Get(vtkDataObject::DATA_OBJECT()));

  //  323   data=vtkStringArray::New();

  //  324   data->SetName("BW Data");

  //  325   data->SetNumberOfComponents(1);

  //  326   data->InsertNextValue(bwData.c_str());

  //  327   output->AddColumn(data);

  //  328   data->Delete();

  //----------------------------------------------------------

  vtkTable *MetaDataOutput;

  vtkStringArray *MetaString;

  //output port for table data

MetaDataOutput = dynamic_cast<vtkTable*>(outInfo->Get(vtkDataObject::DATA_OBJECT()));

MetaString = vtkStringArray::New();

MetaString->SetName("Meta Data");

MetaString->InsertNextValue("This is a Test");

MetaString->InsertNextValue("This is Another Test");

//VVVVVVVVV This is making me crash! VVVVVVVVVVVV//

//----- Need another output port! How? -------//

MetaDataOutput->AddColumn(MetaString);

MetaString->Delete();

//structured grid below here....

  vtkStructuredGrid *structOutput = vtkStructuredGrid::SafeDownCast(output);

--------------

The reader segfaults on MetaDataOutput->AddColumn(MetaString);

If someone could point me in the correct direction (or simply tell me how stupid I am being!, and then point in the correct direction!) I would be very grateful!  I am sure I have a basic misunderstanding of what is supposed to be happening here!

-Josh



From: burlen <burlen.loring at gmail.com<mailto:burlen.loring at gmail.com>>
Date: Thu, 22 Mar 2012 22:41:37 -0600
To: Joshua Murphy <joshua.murphy at lasp.colorado.edu<mailto:joshua.murphy at lasp.colorado.edu>>
Cc: "paraview at paraview.org<mailto:paraview at paraview.org>" <paraview at paraview.org<mailto:paraview at paraview.org>>
Subject: Re: [Paraview] Question on Information Objects

hi, information keys are more for passing info between filters through the pipeline. if all you want is to display a string, you could make a second output port to your reader that produces a vtkTable and populate it with the string. This could be displayed in the pv ui. here's a quick example of what you'd do in your request data:


315   vtkInformation *outInfo;
316   vtkTable *output;
317   vtkStringArray *data;
318
319   // output port 1 -> bw data
320   outInfo=outputVector->GetInformationObject(0);
321   output
322     = dynamic_cast<vtkTable*>(outInfo->Get(vtkDataObject::DATA_OBJECT()));
323   data=vtkStringArray::New();
324   data->SetName("BW Data");
325   data->SetNumberOfComponents(1);
326   data->InsertNextValue(bwData.c_str());
327   output->AddColumn(data);
328   data->Delete();



On 03/22/2012 03:38 PM, Joshua Murphy wrote:
Hello,

I am trying to get meta-data information from a file into ParaView.  I have successfully built the information key-value pairs in the information object in my reader, but I am uncertain how to get the data out on the ParaView side of things.

Example:

I want to get the Calendar date meta-data from my model file.  I added Key to the information object to the results info object.

I set keys as follows:


  request->AppendUnique(vtkExecutive::KEYS_TO_COPY(), vtkENLILMetaDataKeys::REFDATE_CAL());


I have a function to add the value to the key like such:


void vtkENLILMetaDataKeys::populate_meta_data(vtkInformation* request, vtkInformationStringKey *key, char* value)

{

  request->Set(key, value);

}


I then add the values to the keys as follows:


  vtkENLILMetaDataKeys::populate_meta_data(outInfo, vtkENLILMetaDataKeys::REFDATE_CAL(), temp);

After I do this, I can successfully pull the placed data from the information object from within the reader.

What I cannot figure out is how to access this object from within Paraview.

My goal is to be able to include the calendar date (as text) in the render view.

Can someone guide me in the correct direction on how to do this?  I am looking for possibly a python way of getting at this data.

Thanks,

Josh




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