[vtkusers] vtkImagePlaneWidget not shows image on plane

[Jim Peterson]

HEber,
you appear to be discounting all scalar values below zero. What is the 
actual range of values returned from reader->GetScalarRange()?

Jim

Héber de Padua Sousa wrote:
> Hi!
> I need help, please!
> I'm working with vtkImagePlaneWidget, but the image is not showing on 
> the plane.
> Where the plane intersect the volume It shows the color white Instead 
> slice's grayscale texture.
> What is the problem?
> thanks
> this is the code:
>
>  #include "vtkImageData.h"
>  #include "vtkImageViewer2.h"
>  #include "vtkRenderWindowInteractor.h"
>  #include "vtkDICOMImageReader.h"
>  #include "vtkVolumeRayCastMapper.h"
> #include "vtkRenderWindowInteractor.h"
>
>  #include "vtkVolumeTextureMapper2D.h"
>  #include "vtkVolumeTextureMapper3D.h"
> #include "vtkVolumeProperty.h"
> #include "vtkColorTransferFunction.h"
> #include "vtkPiecewiseFunction.h"
> #include <vtkImageShiftScale.h>
> #include "vtkVolumeRayCastMIPFunction.h"
> #include "vtkVolumeRayCastCompositeFunction.h"
> #include "vtkCamera.h"
> #include "vtkImagePlaneWidget.h"
> #include "vtkSmartPointer.h"
> #include "vtkLookupTable.h"
>
>  #include "vtkRenderer.h"
> #include "vtkRenderWindow.h"
>
> int main()
> {
>
> vtkDICOMImageReader *reader = vtkDICOMImageReader :: New();
>  reader-> SetDirectoryName("C:/volumes/PulmaoExtraido/25fatias");
>  
>  reader->Update();
>   
>    double range[2];
>          (reader->GetOutput())->GetScalarRange(range);
>
>    double shiftValue = 0;
> if(range[0] < 0) shiftValue =(-1)*range[0];
> vtkImageShiftScale *shiftScale = vtkImageShiftScale::New();
> shiftScale->SetInput(reader->GetOutput());
> shiftScale->SetScale(1);
> shiftScale->SetShift(shiftValue);
> shiftScale->ClampOverflowOn();
> shiftScale->SetOutputScalarTypeToUnsignedShort();
>
>
> vtkRenderer *aRenderer = vtkRenderer::New();
>
> vtkRenderWindow *renWin = vtkRenderWindow::New();
> renWin->AddRenderer(aRenderer);
>
> vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
> iren->SetRenderWindow(renWin);
>
> vtkLookupTable* table1 = vtkLookupTable::New();
> table1->SetNumberOfTableValues(256);
> table1->Build();
> double r=0;
> double g=0;
> double b=0;
> int indice;
> table1->SetTableValue(0,r/255,g/255,b/255,1.0);
> for(int i=1;i<256;i++) {
>
>      r++;
>      g++;
>      b++;
>      indice=i;
>      table1->SetTableValue(indice,r/255,g/255,b/255,1.0);
> }
> table1->SetTableRange(0,1000);
> table1->SetAlphaRange(1.0,1.0);
>
> vtkImagePlaneWidget *widget = vtkImagePlaneWidget::New();
> widget->SetLookupTable(table1);
> widget->SetInteractor(iren);
> widget->TextureVisibilityOn();
> widget->EnabledOn();
> widget->SetInput(shiftScale->GetOutput());
> widget->SetPlaneOrientationToZAxes();
> widget->PlaceWidget (0, 200, 0, 200, 0, 25);
>
>    aRenderer->SetBackground(0,0.3,0.3);
>
> iren->Initialize();
> iren->Start();
>
> reader->Delete();
> aRenderer->Delete();
> renWin->Delete();
> iren->Delete();
> return 0;
> }
>
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