[vtkusers] vtkImageData creation and use

[Monica Hernandez]

Greetings:
I want to create an vtkImageData object with some specified parameters 
and use it for accessing to its scalar values.
If I do this:

//begining of program
//using vtk 3.0
#include <vtkImageData.h>

//creation of the vtkImageData object with the specified parameters
 vtkImageData *vtkimage = vtkImageData::New();
  vtkimage->SetExtent(0,49,0,49,0,49);
  vtkimage->SetScalarType(VTK_FLOAT);
  vtkimage->SetSpacing(1.0,1.0,1.0);
  vtkimage->SetOrigin(0,0,0);
  vtkimage->SetNumberOfScalarComponents(1);
  float *ptr = (float*) vtkimage->GetScalarPointer();
  int incX, incY, incZ, ext[6];
  vtkimage->GetContinuousIncrements(ext,incX,incY,incZ);

 for (int z=0; z<50; z++){
    for (int y=0; y<50; y++){
      for (int x=0; x<50; x++){
        cerr << x <<" " << y << " " << z << endl;
          cerr << *ptr <<endl;
          ptr++;
      }
      ptr +=incY;
    }
    ptr +=incZ;
  }
//end of program

Things observed:
1) When I execute this code there is a fatal error at x=34 y=18 z=49.
2)Also incX=1091008010 and incY=-1287636448 (I don't know if the function 
GetContinuosIncrements is working correctly, maybe the error is here)

I would like to know how can I access with ptr to all possible scalar 
values of my object.

Thank you very much.


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Mónica Hernández Giménez
Lab. 3.05 Dpto. Ingeniería Electrónica y Comunicaciones 
Centro Politécnico Superior. Universidad de Zaragoza 
Tlfno. (+34) 976761000 Ext.5288 
Fax: (+34) 976762111 
e-mail: mhg at posta.unizar.es
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