[vtkusers] Simple ray casting failed at vtkFixedPointVolumeRayCastMapper

[Summer Sun]

Hello vtk users,

My sample code is very simple as this:

When it runs, it throw an exception at line 706 of
vtkFixedPointVolumeRayCastMapper.cxx
"this->ImageDisplayHelper was nullptr."

code here, very simple,
Thank you for your help!
---
vtkSmartPointer<vtkImageData> imageData =
vtkSmartPointer<vtkImageData>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow1 =
vtkSmartPointer<vtkRenderWindow>::New();
vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkInteractorStyleTrackballCamera> interactorStyle =
vtkSmartPointer<vtkInteractorStyleTrackballCamera>::New();
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
vtkSmartPointer<vtkSmartVolumeMapper> volumeMapper =
vtkSmartPointer<vtkSmartVolumeMapper>::New();
vtkSmartPointer<vtkVolumeProperty> volumeProperty =
vtkSmartPointer<vtkVolumeProperty>::New();
vtkSmartPointer<vtkPiecewiseFunction> gradientOpacity =
vtkSmartPointer<vtkPiecewiseFunction>::New();
vtkSmartPointer<vtkPiecewiseFunction> scalarOpacity =
vtkSmartPointer<vtkPiecewiseFunction>::New();
vtkSmartPointer<vtkColorTransferFunction> color =
vtkSmartPointer<vtkColorTransferFunction>::New();
vtkSmartPointer<vtkVolume> volume = vtkSmartPointer<vtkVolume>::New();

imageData->ShallowCopy(dicomReader->GetOutput());

renderer->SetBackground(0.1, 0.2, 0.3);

renderWindow1->AddRenderer(renderer);
renderWindow1->SetSize(500, 500);

renderWindowInteractor->SetInteractorStyle(interactorStyle);
renderWindowInteractor->SetRenderWindow(renderWindow1);

volumeMapper->SetBlendModeToComposite();
volumeMapper->SetRequestedRenderModeToGPU();
volumeMapper->SetInputData(imageData);

volumeProperty->ShadeOn();
volumeProperty->SetInterpolationTypeToLinear();

volumeProperty->SetAmbient(0.1);
volumeProperty->SetDiffuse(0.9);
volumeProperty->SetSpecular(0.2);
volumeProperty->SetSpecularPower(10.0);

gradientOpacity->AddPoint(0.0, 0.0);
gradientOpacity->AddPoint(2000.0, 1.0);
volumeProperty->SetGradientOpacity(gradientOpacity);

scalarOpacity->AddPoint(-800.0, 0.0);
scalarOpacity->AddPoint(-750.0, 1.0);
scalarOpacity->AddPoint(-350.0, 1.0);
scalarOpacity->AddPoint(-300.0, 0.0);
scalarOpacity->AddPoint(-200.0, 0.0);
scalarOpacity->AddPoint(-100.0, 1.0);
scalarOpacity->AddPoint(1000.0, 0.0);
scalarOpacity->AddPoint(2750.0, 0.0);
scalarOpacity->AddPoint(2976.0, 1.0);
scalarOpacity->AddPoint(3000.0, 0.0);
volumeProperty->SetScalarOpacity(scalarOpacity);

color->AddRGBPoint(-750.0, 0.08, 0.05, 0.03);
color->AddRGBPoint(-350.0, 0.39, 0.25, 0.16);
color->AddRGBPoint(-200.0, 0.80, 0.80, 0.80);
color->AddRGBPoint(2750.0, 0.70, 0.70, 0.70);
color->AddRGBPoint(3000.0, 0.35, 0.35, 0.35);
volumeProperty->SetColor(color);

volume->SetMapper(volumeMapper);
volume->SetProperty(volumeProperty);
renderer->AddVolume(volume);
renderer->ResetCamera();

renderWindow1->Render();
renderWindowInteractor->Start();
---





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