[vtkusers] about vtkBoxWidget

[megha agarwal]

hi
 
i have used vtkBoxWidget for scaling my volume data and it works fine except that the image and the widget and not aligned.
When i scale the volume or rotate it , it moves out of the widget.
Please suugest a solution for this.
I am including my code here
 
vtkRenderWindowInteractor *iren;
vtkVolume *vol;
vtkRenderWindow *renwin;
vtkRenderer *ren;
vtkCamera *cam;
vtkVolumeRayCastMapper *volMapper;
class vtkMyCallback : public vtkCommand
{
public:
  static vtkMyCallback *New() 
    { return new vtkMyCallback; }
  virtual void Execute(vtkObject *caller, unsigned long, void*)
    {
      vtkTransform *t = vtkTransform::New();
      vtkBoxWidget *widget = reinterpret_cast<vtkBoxWidget*>(caller);
      widget->GetTransform(t);
      widget->GetProp3D()->SetUserTransform(t);
    }
};
int main( int argc, char *argv[] )
{
 vtkImageReader *Reader = vtkImageReader::New();
        Reader-> SetHeaderSize (0); 
        Reader->SetDataExtent (0,199,0,199,0,99);
        Reader->SetDataSpacing(1.0,1.0,1.0);
        Reader->SetDataScalarTypeToUnsignedChar();
        Reader->SetDataByteOrderToLittleEndian();
        Reader->SetFileDimensionality(3);
        Reader->SetFileName("d:/bym280602b");
     Reader->SetDataMask(0x7fff);

     vtkPiecewiseFunction *oTFun =vtkPiecewiseFunction::New();
    oTFun->AddSegment(32,0,255,1.0);
 vtkPiecewiseFunction *gTFun =vtkPiecewiseFunction::New();
    gTFun->AddSegment(0,1.0,5,1.0);
   
   vtkVolumeProperty *volProperty = vtkVolumeProperty::New();
    volProperty->SetColor(gTFun);
 volProperty->SetScalarOpacity(oTFun);
 volProperty->SetInterpolationTypeToLinear();
 volProperty->ShadeOn();
   
   vtkVolumeRayCastCompositeFunction *compositeFunction= vtkVolumeRayCastCompositeFunction::New();
 volMapper = vtkVolumeRayCastMapper::New();
    volMapper->SetInput(Reader->GetOutput()); 
 volMapper->SetVolumeRayCastFunction(compositeFunction);
 
 vol=vtkVolume::New();
 vol->SetMapper(volMapper);  
 vol->SetProperty(volProperty);

 ren=vtkRenderer::New();
   ren->AddVolume(vol);   
   
 
    renwin=vtkRenderWindow::New();
   renwin->AddRenderer(ren);
    renwin->SetSize(500,500);
    iren=vtkRenderWindowInteractor::New();
    iren->SetRenderWindow(renwin);
  vtkInteractorStyleTrackballCamera *style = 
    vtkInteractorStyleTrackballCamera::New();
  iren->SetInteractorStyle(style);
   vtkBoxWidget *boxWidget = vtkBoxWidget::New();
  boxWidget->SetInteractor(iren);
  boxWidget->SetPlaceFactor(1);
  boxWidget->SetProp3D(vol);
  boxWidget->PlaceWidget();
  vtkMyCallback *callback = vtkMyCallback::New();
  boxWidget->AddObserver(vtkCommand::InteractionEvent, callback);
 boxWidget->On();
  iren->Initialize();
  iren->Start();
  
   return 0;
}
 
 

 Thanks for help
 
Megha



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