[vtk-developers] Variable output type

[Karthik Krishnan]

David:

Please find attached the modified code. It works now..

Comes down to adding the following method that creates the right data object


//----------------------------------------------------------------------------
int vtkTestFilter::RequestDataObject(
  vtkInformation*,
  vtkInformationVector** inputVector ,
  vtkInformationVector* outputVector)
{
  // for each output
  for(int i=0; i < this->GetNumberOfOutputPorts(); i++)
    {
    vtkInformation* info = outputVector->GetInformationObject(i);
    vtkDataObject *output = info->Get(vtkDataObject::DATA_OBJECT());

    // Populate the right type of output
    this->FillOutputPortInformation( i, info );

    // Create an instance of that output.
    if(const char* dt = info->Get(vtkDataObject::DATA_TYPE_NAME()))
      {
      output = vtkDataObjectTypes::NewDataObject(dt);

      // Set it on the executive.
      this->GetExecutive()->SetOutputData(i, output, info);

      if (output)
        {
        output->FastDelete();
        }
      }
    }
  return 1;
}

On Sat, May 29, 2010 at 9:09 PM, Wylie, Brian <bnwylie at sandia.gov> wrote:

> Also vtkRandomGraphSource has a similar tactic...
>
>
>  // Copy the structure into the output.
>  vtkGraph *output = vtkGraph::GetData(outputVector);
>  if (this->Directed)
>    {
>    if (!output->CheckedShallowCopy(dirBuilder))
>      {
>      vtkErrorMacro(<<"Invalid structure.");
>      return 0;
>      }
>    }
>  else
>    {
>    if (!output->CheckedShallowCopy(undirBuilder))
>      {
>      vtkErrorMacro(<<"Invalid structure.");
>      return 0;
>       }
>    }
>  Brian Wylie - Org 1424
>  Sandia National Laboratories
>  MS 1323 - Building CSRI/242
>  (505)844-2238 FAX(505)284-2518
>       _______ __
>      /_  __(_) /_____ _____
>       / / / / __/ __ `/ __ \
>      / / / / /_/ /_/ / / / /
>     /_/ /_/\__/\__,_/_/ /_/
>            Informatics Toolkit
>
>
> -----Original Message-----
> From: vtk-developers-bounces at vtk.org [mailto:
> vtk-developers-bounces at vtk.org] On Behalf Of Wylie, Brian
> Sent: Saturday, May 29, 2010 9:33 AM
> To: 'David Doria'; 'Karthik Krishnan'
> Cc: 'VTK Developers'
> Subject: Re: [vtk-developers] Variable output type
>
> Not sure if this helps but vtkTableToGraph can either output a directed or
> undirected graph...
>
> It just creates both and then conditional logic on the choice...
>
> // Create builder for the graph
>  VTK_CREATE(vtkMutableDirectedGraph, dirBuilder);
>  VTK_CREATE(vtkMutableUndirectedGraph, undirBuilder);
>  vtkGraph *builder = 0;
>  if (this->Directed)
>    {
>    builder = dirBuilder;
>    }
>  else
>    {
>    builder = undirBuilder;
>    }
>
>  // Add the correct number of vertices to the graph based on the number of
>  // rows in the vertex table.
>  builder->GetVertexData()->PassData(vertexTable->GetRowData());
>  for (vtkIdType i = 0; i < vertexTable->GetNumberOfRows(); ++i)
>    {
>    if (this->Directed)
>      {
>      dirBuilder->AddVertex();
>      }
>    else
>      {
>      undirBuilder->AddVertex();
>      }
>    }
>
>  Brian Wylie - Org 1424
>  Sandia National Laboratories
>  MS 1323 - Building CSRI/242
>  (505)844-2238 FAX(505)284-2518
>       _______ __
>      /_  __(_) /_____ _____
>       / / / / __/ __ `/ __ \
>      / / / / /_/ /_/ / / / /
>     /_/ /_/\__/\__,_/_/ /_/
>            Informatics Toolkit
>
> -----Original Message-----
> From: vtk-developers-bounces at vtk.org [mailto:
> vtk-developers-bounces at vtk.org] On Behalf Of David Doria
> Sent: Saturday, May 29, 2010 9:27 AM
> To: Karthik Krishnan
> Cc: VTK Developers
> Subject: Re: [vtk-developers] Variable output type
>
> > In addition to what you have, please also try adding the following method
> :
> >
> >   int vtkTestFilter::ProcessRequest(vtkInformation* request,
> >                                             vtkInformationVector**
> > inInfoVec,
> >                                             vtkInformationVector*
> > outInfoVec)
> > {
> >   if(request->Has(vtkDemandDrivenPipeline::REQUEST_DATA_OBJECT()))
> >     {
> >     return vtkAlgorithm::ProcessRequest(request, inputVector,
> outputVector);
> >     }
> >
> >   return this->Superclass::ProcessRequest(request, inputVector,
> > outputVector);
> > }
>
> When I added that function (changing inputVector to inInfoVec and
> outputVector to outInfoVec), I now get:
>
> vtkStreamingDemandDrivenPipeline (0x8ba81c8): Algorithm
> vtkTestFilter(0x8ba73b8) did not create output for port 0 when asked
> by REQUEST_DATA_OBJECT and does not specify any DATA_TYPE_NAME.
>
> Thanks for your help - as usual I am trying not to answer just my
> specific question but generate something useful enough to put on the
> wiki!
>
> Thanks,
>
> David
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