[Insight-users] [vtkusers] problems with rendering using ray casting

[Aashish Chaudhary]

You card supports OpenGL 4.1 which is quite new where as the code for
vtkOpenGLVolumeTextureMapper3D is written to support earlier versions.
What I am saying is that some of the extensions required are now may
be in core (rather than being extensions).

What OS / driver you are using? Also can you send us the output of glxinfo?

Thanks,


On Wed, Sep 21, 2011 at 10:04 AM, Prathamesh Kulkarni
<prathameshmkulkarni at gmail.com> wrote:
> I am using Nvidia 6000 Quadro card which supposedly has support for OpenGL.
> Prathamesh
>
> On Wed, Sep 21, 2011 at 12:38 AM, alex Dowson <alexdowson at hotmail.com>
> wrote:
>>
>> 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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>
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-- 
| Aashish Chaudhary
| R&D Engineer
| Kitware Inc.
| www.kitware.com