[vtkusers] Save Registration Deformation field in ITK and

[Markus Weigert]

Hi Mengda,

why do you want to save the ITK deformation field to disk and 
read it with a vtk reader???

You can translate the ITK vectorimage directly to VTK using
itk::ImageToVTKImageFilter and display it.
This way, you can use ITK Imagereaders and writers to read and
write your vectordata.

You can do this by the following code:

typedef itk::Image<float,3>  DeformationFieldType;

void visualizeDeformationField(DeformationFieldType::Pointer defField)
{

try {

   m_DefConnector = itk::ImageToVTKImageFilter<DeformationFieldType>::New();

   m_DefConnector->SetInput(defField);
   m_DefConnector->SetReleaseDataFlag(true); 
   m_DefConnector->Update();
   vtkImageData* m_vtkImage = m_DefConnector->GetOutput();

      m_outline->SetInput(m_vtkImage);
   m_outlineMapper->SetInput(m_outline->GetOutput());

      m_outlineActor->SetMapper(m_outlineMapper);
      m_outlineActor->GetProperty()->SetColor(0.7, 0.3, 0.1);
    
   
   m_pointData = m_vtkImage->GetPointData();

      if ( m_pointData == NULL )
      {
         itkWarningMacro( << "vtkImage->GetPointData() returns NULL!" );
         return ;
      }
      if ( m_pointData->GetNumberOfArrays() == 0 )
      {
         itkWarningMacro( << "vtkImage->GetPointData()->GetNumberOfArrays() is 0!" );
         return ;
      }
      else if ( m_pointData->GetArrayName( 0 ) == NULL )
      {
         m_vtkImage->GetPointData() ->GetArray( 0 ) ->SetName( "vectors" );
      }


   m_arrowSource->Update();
   
   m_maskPoints->SetInput(m_vtkImage);
   m_maskPoints->SetMaximumNumberOfPoints(1000);
   m_maskPoints->RandomModeOn();
   m_maskPoints->Update();

   m_deformationData->SetPoints(m_maskPoints->GetOutput()->GetPoints());
   m_deformationData->GetPointData()->SetVectors(m_maskPoints->GetOutput()->GetPointData()->GetArray(0));

   double* range = m_maskPoints->GetOutput()->GetPointData()->GetArray(0)->GetRange();
   range[0] = 0;

   m_lut->RemoveAllPoints();
   m_lut->AddRGBPoint(range[0],           0.0, 0.0, 1.0);
   m_lut->AddRGBPoint(range[0]+(range[1]-range[0])/4, 0.0, 0.5, 0.5);
   m_lut->AddRGBPoint(range[0]+(range[1]-range[0])/2, 0.0, 1.0, 0.0);
   m_lut->AddRGBPoint(range[1]-(range[1]-range[0])/4, 0.5, 0.5, 0.0);
   m_lut->AddRGBPoint(range[1], 1.0, 0.0, 0.0);

   m_scalarBar->SetLookupTable( m_lut );
   m_scalarBar->SetTitle("Vector magnitude value");
   m_scalarBar->SetOrientationToVertical();
   m_scalarBar->GetLabelTextProperty()->SetColor(0,0,1);
   m_scalarBar->GetTitleTextProperty()->SetColor(0,0,1);

     m_glyph->SetSource( m_arrowSource->GetOutput() );
     m_glyph->SetInput(m_deformationData);
     m_glyph->OrientOn();
     m_glyph->SetVectorModeToUseVector();
  m_glyph->ScalingOn();
     m_glyph->SetScaleModeToScaleByVector();
  m_glyph->SetColorModeToColorByVector();
  m_glyph->SetScaleFactor( 5.0 );
     m_glyph->Update(); 
      
      m_spikeMapper->SetInput(m_glyph->GetOutput());
   m_spikeMapper->SetLookupTable( m_lut );
   m_spikeMapper->Update();
      
      m_spikeActor->SetMapper(m_spikeMapper);
      m_spikeActor->GetProperty()->SetColor(0.0, 0.79, 0.34);

      m_3DRenderer->AddActor( m_spikeActor );
      m_3DRenderer->AddActor( m_outlineActor );
   m_3DRenderer->AddActor( m_scalarBar );
      
   m_3DRenderer->GetActiveCamera()->SetViewUp(0, 0, -1);
   m_3DRenderer->GetActiveCamera()->SetPosition(-2, -2, -2);
   m_3DRenderer->GetActiveCamera()->SetFocalPoint(0, 0, 0);
   m_3DRenderer->GetActiveCamera()->ComputeViewPlaneNormal();
   m_3DRenderer->ResetCamera();
   m_3DRenderer->ResetCameraClippingRange();
   m_3DRenderer->SetBackground(0.0, 0.0, 0.0);

   m_3DRenderWindow->Start();
   m_3DRenderer->Render();
 
   m_3DRenderWindowInteractor->redraw();

}



Kind Regards,
Markus
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