[vtkusers] Reading an XDMF file using the vtkXdmf3Reader class fails even though the function CanReadFile() returns true.

[Magnus Elden]

I am trying to modify the SmartVolumeMapper example to read an .xdmf file,
but I get an error when calling the Update() function.

 

1 1'Value' not in itemProperties in XdmfTime::populateItem

 

The error above is all I have been able to get out of the function. What am
I doing wrong? The .xdmf, .h5 and .hdf5 are all in the same folder and the
"1 1" output before the error shows that it can be read. I am using
VisualStudio 2015 and no other libraries than VTK. I am building everything
as x64 Release. The error occurs between '1' and '2'. (Please refer to the
printf() calls below.)

 

This is a minimal program that causes the error:

#include <vtkVersion.h>

#include <vtkSmartPointer.h>

#include <vtkSphere.h>

#include <vtkSampleFunction.h>

#include <vtkSmartVolumeMapper.h>

#include <vtkColorTransferFunction.h>

#include <vtkPiecewiseFunction.h>

#include <vtkRenderer.h>

#include <vtkRenderWindow.h>

#include <vtkRenderWindowInteractor.h>

#include <vtkVolumeProperty.h>

#include <vtkCamera.h>

#include <vtkImageShiftScale.h>

#include <vtkImageData.h>

#include <vtkPointData.h>

#include <vtkDataArray.h>

#include <vtkXMLImageDataReader.h>

#include <vtkXdmf3Reader.h>

 

static void CreateImageData(vtkImageData* im);

 

int main(int argc, char *argv[])

{

       vtkSmartPointer<vtkXdmf3Reader> reader =

              vtkSmartPointer<vtkXdmf3Reader>::New();

 

 
reader->SetFileName("C:/Users/NoobsDeSroobs/Downloads/testVolume.xdmf");

       printf("1 %d" ,
reader->CanReadFile("C:/Users/NoobsDeSroobs/Downloads/testVolume.xdmf"));

       reader->Update();

       printf("2");

       int numArrays = reader->GetNumberOfPointArrays();

       printf("3");

       for (int i = 0; i < numArrays; i++) {

              printf("Name of index %d is: %s", i,
reader->GetPointArrayName(i));

              printf("2");

       }

 

       return 0;

}

 

 

Finally, I noticed that the standard way of copying the read data to the
vtkImageData is by doing a shallow copy of the output of the reader, but
imageData->ShallowCopy(reader->GetOutput()) does not compile as GetOutput()
does not exist. I have a feeling this might have something to do with the
fact that this is a 4D file and not a standard 3D file. 

 

If possible a working example would be great to have.

 

Finally, some functions like Update() and Read() are not listed in the
documentation: http://www.vtk.org/doc/nightly/html/classvtkXdmf3Reader.html
Just a heads up.

 

Thank you so much for your help.

 

Yours,

Magnus Elden

 

 

 

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