[vtkusers] problem with GetNumberOfPoints () and GetNumberOfCells ()

[Marco Kassner]

Hello.

This is my first mail to the group.
I develop a program which reads voxel data and calculates Spinmaps.
Representing the data works easily but I have a problem to access the
PolyData.
I receive the result null for the function GetNumberOfPoints () and
GetNumberOfCells ().

Please, can somebody tell me, which filter I still need or where the error
is ?

It would be great, if somebody can help me.


My program:

// first data read
 vtkVolume16Reader *v16 = vtkVolume16Reader::New();
    v16->SetDataDimensions(64,64);
    v16->SetDataByteOrderToLittleEndian();
    v16->SetFilePrefix ("D:\\VTK32\\vtkdata\\headsq\\quarter");
    v16->SetImageRange(1, 93);
    v16->SetDataSpacing (3.2, 3.2, 1.5);

// extract the skin
  vtkContourFilter *skinExtractor = vtkContourFilter::New();
    skinExtractor->SetInput(v16->GetOutput());
    skinExtractor->SetValue(0, 500);
  vtkStripper *skinStripper = vtkStripper::New();
    skinStripper->SetInput(skinExtractor->GetOutput());

// forcing triangles
  vtkTriangleFilter *skinTriangleFilter = vtkTriangleFilter:: New() ;
    skinTriangleFilter->SetInput(skinStripper->GetOutput()) ;

// data reduce
  vtkDecimate  *skinDecimate = vtkDecimate::New();
    skinDecimate->SetInput(skinTriangleFilter->GetOutput());
    skinDecimate->SetAspectRatio (20.0);
    skinDecimate->SetInitialError (0.0005);
    skinDecimate->SetErrorIncrement (0.001);
    skinDecimate->SetMaximumIterations (10);
    skinDecimate->SetMaximumNumberOfSquawks (0);
    skinDecimate->PreserveEdgesOff () ;

// type PolyData
  vtkPolyData *polydatatemp = vtkPolyData::New();
    polydatatemp = skinDecimate->GetOutput() ;

    printf ("\nGetNumberOfPoints = %i",polydatatemp->GetNumberOfPoints()) ;    // output = 0
    printf ("\nGetNumberOfCells = %i",polydatatemp->GetNumberOfCells()) ;      // output = 0



                                Thanks, Marco

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Marco Kassner:

e-mail: kassner at cs.tu-berlin.de

PS: Make it as simple as possible, but not simpler. (A.E.)
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