[vtkusers] Convert ITK image to VTK volume keeping proper orientation and position

[Dženan Zukić]

I added the example
itkVtkImageConvert<http://www.vtk.org/Wiki/VTK/Examples/Cxx/VolumeRendering/itkVtkImageConvert>.
It would be nice if someone could test this, preferably on Linux (because I
created this on Windows).

2011/7/5 Dženan Zukić <dzenanz at gmail.com>

> OK, I will create an example employing this and put it in VTK wiki.
>
> Dženan
>
> 2011/7/5 David Doria <daviddoria at gmail.com>
>
>> 2011/7/5 Dženan Zukić <dzenanz at gmail.com>:
>> > I hope this function can save someone a lot of time and headaches. It
>> takes
>> > an itk::Image and converts it into a vtkVolume, keeping it in DICOM's
>> > patient physical world space. Its main usage is combining it with
>> segmented
>> > structures (vtkPolyData) whose vertices are in DICOM patient space, that
>> is,
>> > vertex coordinates were obtained using
>> > visualizing->TransformIndexToPhysicalPoint().
>> > typedef itk::Image<unsigned char, 3> VisualizingImageType
>> > void showITKimageInVTKqwidget(VisualizingImageType::Pointer visualizing)
>> > {
>> >     typedef itk::ImageToVTKImageFilter<VisualizingImageType>
>> > itkVtkConverter;
>> >     itkVtkConverter::Pointer conv=itkVtkConverter::New();
>> >     conv->SetInput(visualizing);
>> >
>> >     vtkGPUVolumeRayCastMapper *mapper =
>> vtkGPUVolumeRayCastMapper::New();
>> >     mapper->SetInput(conv->GetOutput());
>> >     vtkVolume *volume=vtkVolume::New();
>> >     volume->SetProperty( myTransferFunction );
>> >     volume->SetMapper( mapper );
>> >     // vtkVolume only manages spacing by itself.
>> >     // Here we take care of position and orientation so it is in DICOM
>> > physical space
>> > VisualizingImageType::DirectionType d=visualizing->GetDirection();
>> > vtkMatrix4x4 *mat=vtkMatrix4x4::New(); //identity matrix
>> > for (int i=0; i<3; i++)
>> > for (int k=0; k<3; k++)
>> > mat->SetElement(i,k, d(i,k));
>> > VisualizingImageType::PointType origin=visualizing->GetOrigin();
>> > volume->SetOrigin(-origin[0], -origin[1], -origin[2]);
>> > volume->SetPosition(-origin[0], -origin[1], -origin[2]);
>> > for (int i=0; i<3; i++)
>> > mat->SetElement(i,3, origin[i]);
>> > volume->SetUserMatrix(mat);
>> >     vtkRenderer *renderer =
>> > myQWidget->GetRenderWindow()->GetRenderers()->GetFirstRenderer();
>> >     renderer->AddVolume( volume );
>> >     myQWidget->GetRenderWindow()->Render();
>> >     renderer->ResetCamera();
>> > }
>> >
>> > Dženan
>>
>> Dženan,
>>
>> Thanks for sharing. I would put something like this on the examples
>> wiki in a section called "Bridge" or "Glue" or something like that
>> (these are names that have been previously used to describe
>> interactions between ITK and VTK). This will make it much easier to
>> find in the future instead of having to dig through old mailing list
>> archives.
>>
>> David D.
>>
>
>
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