[vtkusers] read from multiple files

[Adrian Albert]

Hi


Thanks so much for the reply! My previous post was indeed rather vague, so
here are some clarifications:

1) I would like to read data over the same regular grid from multiple files
(at each point in a 3D regular grid I have several physical fields such as
temperature, pressure, etc, stored each in a separate file)

2) I am now using vtkImageAppendComponent to construct a multidimensional
data object defined over a 3D regular grid:
*
  vtkStructuredPointsReader *reader = vtkStructuredPointsReader::New();
  reader->SetFileName(fname);
  reader->Update();
  vtkStructuredPointsReader *reader1 = vtkStructuredPointsReader::New();
  reader1->SetFileName(fname2);
  reader1->Update();
  vtkImageAppendComponents *readerBundle = vtkImageAppendComponents::New ();
  readerBundle->AddInput (reader->GetOutput ());
  readerBundle->AddInput (reader1->GetOutput ());
*
However, I don't know how to access the individual data fields from this
object to manipulate them. Any suggestions?

3) This multifield object I want to pass to a class that is subclassed from
vtkScalarsToColors that could compute a transfer function for volume
rendering based on this data. Is there a way to achieve that via the
SetInputPort(myObject->GetOutputPort()) mechanism?

4) If I were to use vtkPointData or vtkCellData, how can I store the outputs
of several vtkStructuredPointsReader (which operate on one file only) into a
single vtkPointData object?

5) Does vtkFixedPointVolumeRayCastMapper accept a
vtkPointData->GetOutputPort() at its input port?

Thanks again for helping!

Adrian

On Mon, Apr 7, 2008 at 9:34 AM, Mathieu Malaterre <
mathieu.malaterre at gmail.com> wrote:

> Hi Adrian,
>
> On Thu, Apr 3, 2008 at 10:10 AM, Adrian Albert
> <a.albert at jacobs-university.de> wrote:
> > Does anyone know how to read data from multiple files into the same
> > vtkImageData object?
>
> what file format are you talking about ?
>
>
> http://www.vtk.org/Wiki/VTK_FAQ#What_image_file_formats_can_VTK_read_and_write.3F
>
> > Does VTK even support multi-dimensional fields defined
> > over a 3D domain?
>
> yes, see the vtkPointData / vtkCellData classes.
>
> > --
> > ---------------------------------------------------
> >  Adrian Albert
> > School of Engineering and Science
> > Jacobs University Bremen
> > Germany
> > Tel.: 00494212003258
> > _______________________________________________
> >  This is the private VTK discussion list.
> >  Please keep messages on-topic. Check the FAQ at:
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> >
> >
>
>
>
> --
> Mathieu
>



-- 
---------------------------------------------------
Adrian Albert
School of Engineering and Science
Jacobs University Bremen
Germany
Tel.: 00494212003258
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