[vtkusers] Problem : vtkStructuredPointsReader

[gku]

Hi, Can any one tell me where am I going wrong. I am a newbie in vtk and 
trying to run a sample program using vtkStructuredPointsReader, but I am not 
able to run it. I have VTK 4.0 with me. And I tried this program form nightly 
version too with no success.
 
Here is my Program.
 
#include <vtkRenderer.h> 
#include <vtkRenderWindow.h> 
#include <vtkRenderWindowInteractor.h> 
#include <vtkStructuredPointsReader.h> 
#include <vtkPiecewiseFunction.h> 
#include <vtkVolumeProperty.h> 
#include <vtkVolumeRayCastCompositeFunction.h> 
#include <vtkVolumeRayCastMapper.h> 
#include <vtkVolume.h> 
#include <vtkColorTransferFunction.h> 
#include <vtkCamera.h> 
#include <vtkImageSource.h> 
#include <iostream> 
using namespace std;
 
int main( int argc, char *argv[] ) 
{
  vtkRenderer               *renderer   = vtkRenderer::New();
  vtkRenderWindow           *renWindow  = vtkRenderWindow::New();
  vtkRenderWindowInteractor *interactor = vtkRenderWindowInteractor::New();
  vtkStructuredPointsReader *reader = vtkStructuredPointsReader::New();
  vtkPiecewiseFunction *opacity = vtkPiecewiseFunction::New();
  vtkColorTransferFunction *color = vtkColorTransferFunction::New();
  vtkVolumeProperty *volumeProperty = vtkVolumeProperty::New();
  vtkVolumeRayCastCompositeFunction *compositeFunction =
                   vtkVolumeRayCastCompositeFunction::New();
  vtkVolumeRayCastMapper *volumeMapper = vtkVolumeRayCastMapper::New();
  vtkVolume *volume = vtkVolume::New();

  renWindow->SetSize(400,400);

  reader->SetFileName("/packages/VTK4.1/VTKData/Data/ironProt.vtk");
  reader->Update();

  opacity->AddSegment(0, 0.0, 255, 0.5);
  color->AddRGBPoint(64, 1.0, 0.0, 0.0);
  color->AddRGBPoint(128, 1.0, 1.0, 0.0);
  color->AddRGBPoint(196, 0.0, 1.0, 1.0);

  volumeProperty->SetColor(color);
  volumeProperty->SetScalarOpacity(opacity);
  volumeProperty->SetInterpolationTypeToLinear();
  volumeProperty->ShadeOn();


  volumeMapper->SetInput((vtkImageData*) (reader->GetOutput()));
  volumeMapper->SetVolumeRayCastFunction(compositeFunction);

  volume->SetMapper(volumeMapper);
  volume->SetProperty(volumeProperty);

  renderer->SetBackground(0.2, 0.2, 0.8);
  renderer->AddVolume(volume);
  renderer->GetActiveCamera()->Azimuth(20.0);
  renderer->GetActiveCamera()->Dolly(1.60);
  renderer->ResetCameraClippingRange();

  interactor->SetRenderWindow(renWindow);
  renWindow->AddRenderer(renderer);
  renWindow->Render();
  interactor->Start();

  renderer->Delete();
  renWindow->Delete();
  interactor->Delete();
  reader->Delete();
  opacity->Delete();
  color->Delete();
  volumeProperty->Delete();
  compositeFunction->Delete();
  volumeMapper->Delete();
  volume->Delete();

  return 0;
 
}

 
The Program compiles properly, But when I run I get the following message 
along with a blue screen.
 
ERROR: In /packages/ParaViewComplete06/VTK/IO/vtkDataReader.cxx, line 370 
vtkStructuredPointsReader (0x805a990): No file specified!
 
ERROR: In /packages/ParaViewComplete06/VTK/Common/vtkDataObject.cxx, line 544 
vtkStructuredPoints (0x805aa88): Update extent does not lie within whole 
extent
 
ERROR: In /packages/ParaViewComplete06/VTK/Common/vtkDataObject.cxx, line 551 
vtkStructuredPoints (0x805aa88): Update extent is: -1, -1, -1, -1, -1, -1
 
ERROR: In /packages/ParaViewComplete06/VTK/Common/vtkDataObject.cxx, line 558 
vtkStructuredPoints (0x805aa88): Whole extent is: 0, -1, 0, -1, 0, -1
 
ERROR: In /packages/ParaViewComplete06/VTK/IO/vtkDataReader.cxx, line 370 
vtkStructuredPointsReader (0x805a990): No file specified!
 
ERROR: In /packages/ParaViewComplete06/VTK/IO/vtkDataReader.cxx, line 370 
vtkStructuredPointsReader (0x805a990): No file specified!
 
ERROR: In /packages/ParaViewComplete06/VTK/Common/vtkDataObject.cxx, line 544 
vtkStructuredPoints (0x805aa88): Update extent does not lie within whole 
extent
 
ERROR: In /packages/ParaViewComplete06/VTK/Common/vtkDataObject.cxx, line 551 
vtkStructuredPoints (0x805aa88): Update extent is: -1, -1, -1, -1, -1, -1
 
ERROR: In /packages/ParaViewComplete06/VTK/Common/vtkDataObject.cxx, line 558 
vtkStructuredPoints (0x805aa88): Whole extent is: 0, -1, 0, -1, 0, -1
 
ERROR: In /packages/ParaViewComplete06/VTK/IO/vtkDataReader.cxx, line 370 
vtkStructuredPointsReader (0x805a990): No file specified!
 
I have the file name, the file name is proper, and I have tried giving 
filename in different ways like (./ironProt.vtk, 
$VTK_DATA_ROOT/Data/ironProt.vtk ..etc.).
 
Answer will be greatly appreciated.
 
Thanks, 
Guru.