[vtkusers] vtkMergeDataObjectFilter

[dsjen at cs.unc.edu]

I'm not all that familiar with vtk, so others feel free to offer 
suggestions as well.

It looks as though you need to set the name of your 
vtkDataObjectReader, which I guess is named doReader in your case.  
Something like:

     doReader->SetScalarsName("time9");

might do the trick.

Alternatively, like you said, you could create a vtkDoubleArray and 
fill it with the scalar values and set the name of that array 
to "scalar0," although that doesn't seems like the optimal way...

Good Luck,
Dennis

- Dennis

----- Original Message -----
From: "mccoy" <j.mccoy at gmx.de>
Date: Tuesday, July 15, 2003 9:18 am
Subject: Re: [vtkusers] vtkMergeDataObjectFilter

> thank you  for answering so fast :-)
> nope, in fact, i didn't. i just 'retyped' the tcl- example in cpp. 
> meanwhilei've discovered that the same code in tcl works... but 
> still i need it in
> vcpp.
> can you tell me, where i have to assign the array-name? in the
> DataObjectReader? or must i first create an array and read the 
> scalar file
> into it? till now, the name "scalar0" appears only in the vtk 
> scalar-file
> header.
> 
> 
> 
> 
> ----- Original Message -----
> From: <dsjen at cs.unc.edu>
> To: "mccoy" <j.mccoy at gmx.de>
> Cc: <vtkusers at vtk.org>
> Sent: Tuesday, July 15, 2003 3:05 PM
> Subject: Re: [vtkusers] vtkMergeDataObjectFilter
> 
> 
> > It might be that you're not setting the name properly.  Did you use
> > something like:
> >
> > array->SetName("scalar0");
> >
> > by using some sort of vtkArray?
> >
> > - Dennis
> >
> > ----- Original Message -----
> > From: "mccoy" <j.mccoy at gmx.de>
> > Date: Tuesday, July 15, 2003 7:49 am
> > Subject: [vtkusers] vtkMergeDataObjectFilter
> >
> > > 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.
> > >
> > >
> > >
> >
> 
> 
>