[vtkusers] problems with rendering using ray casting

[Prathamesh Kulkarni]

Hello,

I am trying to render a volume (mhd file read as ITKImage<float, 3>) using
VTK ray casting. I have tried to use the different available mappers, but
the output is always only background. For the mappers using OpenGL, I get
the error:  line 100 vtkOpenGLVolumeTextureMapper3D (0000000003270440):
required extensions not supported. Below is my code. Any help would be very
useful.


        typedef itk::ImageToVTKImageFilter<ImageType3D>
ITKToVTKConnectorType;
ITKToVTKConnectorType::Pointer ITK_to_VTK_connector =
ITKToVTKConnectorType::New();

ITK_to_VTK_connector->SetInput(data_ptr);
ITK_to_VTK_connector->Update();

vtkSmartPointer<vtkImageData> vtk_image = ITK_to_VTK_connector->GetOutput();

// Testing vtk image
vtk_image->PrintSelf(std::cout, vtkIndent(0));

vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
renderer->SetBackground(1.0, 1.0, 1.0);
        vtkSmartPointer<vtkRenderWindow> render_window =
vtkSmartPointer<vtkRenderWindow>::New();
render_window->AddRenderer(renderer);
 vtkSmartPointer<vtkRenderWindowInteractor> render_window_interactor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
render_window_interactor->SetRenderWindow(render_window);
 vtkSmartPointer<vtkPiecewiseFunction> opacity_transfer_function =
vtkSmartPointer<vtkPiecewiseFunction>::New();
/*opacity_transfer_function->AddPoint(20, 0.0);
opacity_transfer_function->AddPoint(25, 0.2);
*/

vtkSmartPointer<vtkColorTransferFunction> color_transfer_function =
vtkSmartPointer<vtkColorTransferFunction>::New();
/*color_transfer_function->AddRGBPoint(0.0, 0.0, 0.0, 0.0);
color_transfer_function->AddRGBPoint(64.0, 1.0, 0.0, 0.0);
color_transfer_function->AddRGBPoint(128.0, 0.0, 0.0, 1.0);
color_transfer_function->AddRGBPoint(192.0, 0.0, 1.0, 0.0);
color_transfer_function->AddRGBPoint(255.0, 0.0, 0.2, 0.0);
*/

vtkSmartPointer<vtkVolumeProperty> volume_property =
vtkSmartPointer<vtkVolumeProperty>::New();
volume_property->SetColor(color_transfer_function);
volume_property->SetScalarOpacity(opacity_transfer_function);
volume_property->ShadeOn();
volume_property->SetInterpolationTypeToLinear();
volume_property->SetIndependentComponents(1);

vtkSmartPointer<vtkVolumeRayCastCompositeFunction> composite_function =
vtkSmartPointer<vtkVolumeRayCastCompositeFunction>::New();
 //vtkSmartPointer<vtkVolumeRayCastMapper> volume_mapper =
vtkSmartPointer<vtkVolumeRayCastMapper>::New();
//vtkSmartPointer<vtkFixedPointVolumeRayCastMapper> volume_mapper =
vtkSmartPointer<vtkFixedPointVolumeRayCastMapper>::New();
        vtkSmartPointer<vtkOpenGLVolumeTextureMapper3D> volume_mapper =
vtkSmartPointer<vtkOpenGLVolumeTextureMapper3D>::New();
//vtkSmartPointer<vtkGPUVolumeRayCastMapper> volume_mapper =
vtkSmartPointer<vtkGPUVolumeRayCastMapper>::New();
//vtkSmartPointer<vtkOpenGLGPUVolumeRayCastMapper> volume_mapper =
vtkSmartPointer<vtkOpenGLGPUVolumeRayCastMapper>::New();

//volume_mapper->SetVolumeRayCastFunction(composite_function);
volume_mapper->SetInput(vtk_image);
volume_mapper->SetBlendModeToComposite();
//volume_mapper->SetBlendModeToMaximumIntensity();
//volume_mapper->SetScalarMode(1);
volume_mapper->SetSampleDistance(0.2);

vtkSmartPointer<vtkVolume> volume = vtkSmartPointer<vtkVolume>::New();
volume->SetMapper(volume_mapper);
volume->SetProperty(volume_property);
volume->Update();
 render_window->Render();
renderer->AddVolume(volume);
renderer->ResetCamera();
 render_window_interactor->Initialize();
render_window->Render();
render_window_interactor->Start();


Thanks,
Prathamesh
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