[vtkusers] Linking error with simple volume rendering program

[rywchiu]

Hi,

I'm trying to convert the SimplyRayCast volume rendering example from Tcl to C++.  I've looked at similar previous threads(http://public.kitware.com/pipermail/vtkusers/2003-July/068453.html) and made the appropriate adjustments that were recommended. However, I'm still getting the following errors:

error LNK2019: unresolved external symbol "public: class vtkStructuredPoints * __thiscall vtkStructuredPointsReader::GetOutput(void)" (?GetOutput at vtkStructuredPointsReader@@QAEPAVvtkStructuredPoints@@XZ) referenced in function _main

error LNK2019: unresolved external symbol "public: static class vtkStructuredPointsReader * __cdecl vtkStructuredPointsReader::New(void)" (?New at vtkStructuredPointsReader@@SAPAV1 at XZ) referenced in function _main
D


Here's my code:

#include "vtkStructuredPoints.h"
#include "vtkStructuredPointsReader.h"
#include "vtkPiecewiseFunction.h"
#include "vtkColorTransferFunction.h"
#include "vtkVolumeProperty.h"
#include "vtkVolumeRayCastCompositeFunction.h"
#include "vtkVolumeRayCastMapper.h"
#include "vtkVolume.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include "vtkCamera.h"
#include "vtkInteractorStyleTrackballCamera.h"

int main( int argc, char *argv[] )
{
  vtkStructuredPointsReader *reader;
  reader = vtkStructuredPointsReader::New();
  reader->SetFileName("C:/VTK/Examples/Samples/ironProt.vtk");

  vtkPiecewiseFunction *opacityTF;
  opacityTF = vtkPiecewiseFunction::New();
  opacityTF->AddPoint(20, 0.0);
  opacityTF->AddPoint(255, 0.2);

  vtkColorTransferFunction *colorTF;
  colorTF = vtkColorTransferFunction::New();
  colorTF->AddRGBPoint(0.0, 0.0, 0.0, 0.0);
  colorTF->AddRGBPoint(64.0, 1.0, 0.0, 0.0);
  colorTF->AddRGBPoint(128.0, 0.0, 0.0, 1.0);
  colorTF->AddRGBPoint(192.0, 0.0, 1.0, 0.0);
  colorTF->AddRGBPoint(255.0, 0.0, 0.2, 0.0);

  vtkVolumeProperty *volumeProperty;
  volumeProperty = vtkVolumeProperty::New();
  volumeProperty->SetColor(colorTF);
  volumeProperty->SetScalarOpacity(opacityTF);
  volumeProperty->ShadeOn();
  volumeProperty->SetInterpolationTypeToLinear();

  vtkVolumeRayCastCompositeFunction *compositeFunction;
  compositeFunction = vtkVolumeRayCastCompositeFunction::New();
  
  vtkVolumeRayCastMapper *volumeMapper;
  volumeMapper = vtkVolumeRayCastMapper::New();
  volumeMapper->SetVolumeRayCastFunction(compositeFunction);
  volumeMapper->SetInput(reader->GetOutput());

  vtkVolume *volume;
  volume = vtkVolume::New();
  volume->SetMapper(volumeMapper);
  volume->SetProperty(volumeProperty);

  vtkRenderer *ren1= vtkRenderer::New();
  ren1->AddVolume( volume );
  ren1->SetBackground( 1, 1, 1 );

  vtkRenderWindow *renWin = vtkRenderWindow::New();
  renWin->AddRenderer( ren1 );
  renWin->SetSize( 600, 600 );

  vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
  iren->SetRenderWindow(renWin);

  vtkInteractorStyleTrackballCamera *style = 
  vtkInteractorStyleTrackballCamera::New();
  iren->SetInteractorStyle(style);

  iren->Initialize();
  renWin->Render();
  iren->Start();

  reader->Delete();
  opacityTF->Delete();
  colorTF->Delete();
  volumeProperty->Delete();
  volumeMapper->Delete();
  volume->Delete();
  ren1->Delete();
  renWin->Delete();
  iren->Delete();
  style->Delete();

  return 0;
}

Any idea on what is causing those errors? I suspect it has to do with this line:

  volumeMapper->SetInput(reader->GetOutput());

and that the data types are not matching.  However, according to the previous threads, the above code should work fine...

Thanks and Regards,
Rita