[Insight-users] problems with rendering using ray casting

[alex Dowson]

Hi

I think you’r graphic card doesnot have this extension supported. Do you have any GPU based card ? like ATI Radeon or Nvidia ?


Alex

From: Prathamesh Kulkarni 
Sent: Wednesday, September 21, 2011 9:32 AM
To: VTK Mailing List ; insight-users at itk.org 
Cc: Luisi, Jonathan D 
Subject: [Insight-users] problems with rendering using ray casting


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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