[vtkusers] vtkMergeDataObjectFilter

[mccoy]

hi there,

i have  problem that has allready been dealt with some time before in this archive, but nevertheless my code won't work. maybe someone can tell me what i'm doing wrong.
all right, here is my problem: i have a geometry (unstructured grid) and a lot of time steps of scalar data. now i want to read the geometry once and then merge it with some attribute-data of a special timestep.

following the answers in the archives i created one unstructured grid *.vtk file and a lot of fielddata- files containing the scalar- values of each timestep. now i wanted to mergethe geometry and a scalarfile with 'vtkMergeDataObjectFilter'. i did so using:

// m_reader: DataSetReader
// doReader: DataObjectReader
    
      vtkMergeDataObjectFilter *mdof;
      vtkFieldDataToAttributeDataFilter *fd2ad;
      vtkDataSetMapper *dMapper;
                    ...
      mdof = vtkMergeDataObjectFilter::New();
      mdof->SetInput(m_reader->GetOutput() );
      mdof->SetDataObject(doReader->GetOutput() );

      fd2ad = vtkFieldDataToAttributeDataFilter::New();
      fd2ad->SetInput(mdof->GetOutput() );
      fd2ad->SetOutputAttributeDataToPointData();
      fd2ad->SetScalarComponent(0, "scalar0", 0);

     dMapper = vtkDataSetMapper::New();
     dMapper->SetInput(fd2ad->GetOutput() );

the scalar- files are formated like:

      # vtk DataFile Version 2.0 
      Scalardata 
      ASCII 
      FIELD time0 1
      scalar0 1 3470 float
      6.300000E+02
      6.300000E+02
      6.300000E+02
      ...

now there is no compiler error (vcpp6.0), and the program runs. but it only shows the geometry, no scalar information. and i get the error:
    error: vtkFieldDataToAttributeDataFilter (0x09D1B940): Can't find array/component requested

does anybody now where i'm wrong? How else should i run SetScalarComponent, or is there something complete different to use?

thank u all.


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