diff --git a/Modules/SurfaceInterpolation/mitkSurfaceInterpolationController.cpp b/Modules/SurfaceInterpolation/mitkSurfaceInterpolationController.cpp
index 22a5a69160..619e8f90e2 100644
--- a/Modules/SurfaceInterpolation/mitkSurfaceInterpolationController.cpp
+++ b/Modules/SurfaceInterpolation/mitkSurfaceInterpolationController.cpp
@@ -1,692 +1,699 @@
 /*===================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center,
 Division of Medical and Biological Informatics.
 All rights reserved.
 
 This software is distributed WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.
 
 See LICENSE.txt or http://www.mitk.org for details.
 
 ===================================================================*/
 
 #include "mitkSurfaceInterpolationController.h"
 #include "mitkMemoryUtilities.h"
 #include "mitkImageAccessByItk.h"
 #include "mitkImageCast.h"
 
 #include "mitkImageToSurfaceFilter.h"
 //#include "vtkXMLPolyDataWriter.h"
 #include "vtkPolyDataWriter.h"
 
 // Check whether the given contours are coplanar
 bool ContoursCoplanar(mitk::SurfaceInterpolationController::ContourPositionInformation leftHandSide, mitk::SurfaceInterpolationController::ContourPositionInformation rightHandSide)
 {
   // Here we check two things:
   // 1. Whether the normals of both contours are at least parallel
   // 2. Whether both contours lie in the same plane
 
   // Check for coplanarity:
   // a. Span a vector between two points one from each contour
   // b. Calculate dot product for the vector and one of the normals
   // c. If the dot is zero the two vectors are orthogonal and the contours are coplanar
 
   double vec[3];
   vec[0] = leftHandSide.contourPoint[0] - rightHandSide.contourPoint[0];
   vec[1] = leftHandSide.contourPoint[1] - rightHandSide.contourPoint[1];
   vec[2] = leftHandSide.contourPoint[2] - rightHandSide.contourPoint[2];
   double n[3];
   n[0] = rightHandSide.contourNormal[0];
   n[1] = rightHandSide.contourNormal[1];
   n[2] = rightHandSide.contourNormal[2];
   double dot = vtkMath::Dot(n, vec);
 
   double n2[3];
   n2[0] = leftHandSide.contourNormal[0];
   n2[1] = leftHandSide.contourNormal[1];
   n2[2] = leftHandSide.contourNormal[2];
 
   // The normals of both contours have to be parallel but not of the same orientation
   double lengthLHS = leftHandSide.contourNormal.GetNorm();
   double lengthRHS = rightHandSide.contourNormal.GetNorm();
   double dot2 = vtkMath::Dot(n, n2);
   bool contoursParallel = mitk::Equal(fabs(lengthLHS*lengthRHS), fabs(dot2), 0.001);
 
   if (mitk::Equal(dot, 0.0, 0.001) && contoursParallel)
     return true;
   else
     return false;
 }
 
 mitk::SurfaceInterpolationController::ContourPositionInformation CreateContourPositionInformation(mitk::Surface::Pointer contour)
 {
   mitk::SurfaceInterpolationController::ContourPositionInformation contourInfo;
   contourInfo.contour = contour;
   double n[3];
   double p[3];
   contour->GetVtkPolyData()->GetPoints()->GetPoint(0, p);
   vtkPolygon::ComputeNormal(contour->GetVtkPolyData()->GetPoints(), n);
   contourInfo.contourNormal = n;
   contourInfo.contourPoint = p;
   return contourInfo;
 }
 
 mitk::SurfaceInterpolationController::SurfaceInterpolationController()
   :m_SelectedSegmentation(0), m_CurrentTimeStep(0)
 {
   m_ReduceFilter = ReduceContourSetFilter::New();
   m_NormalsFilter = ComputeContourSetNormalsFilter::New();
   m_InterpolateSurfaceFilter = CreateDistanceImageFromSurfaceFilter::New();
   m_TimeSelector = ImageTimeSelector::New();
 
   m_ReduceFilter->SetUseProgressBar(false);
 //  m_ReduceFilter->SetProgressStepSize(1);
   m_NormalsFilter->SetUseProgressBar(true);
   m_NormalsFilter->SetProgressStepSize(1);
   m_InterpolateSurfaceFilter->SetUseProgressBar(true);
   m_InterpolateSurfaceFilter->SetProgressStepSize(7);
 
   m_Contours = Surface::New();
 
   m_PolyData = vtkSmartPointer<vtkPolyData>::New();
   vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
   m_PolyData->SetPoints(points);
 
   m_InterpolationResult = 0;
   m_CurrentNumberOfReducedContours = 0;
 }
 
 mitk::SurfaceInterpolationController::~SurfaceInterpolationController()
 {
   //Removing all observers
   std::map<mitk::Image*, unsigned long>::iterator dataIter = m_SegmentationObserverTags.begin();
   for (; dataIter != m_SegmentationObserverTags.end(); ++dataIter )
   {
     (*dataIter).first->RemoveObserver( (*dataIter).second );
   }
   m_SegmentationObserverTags.clear();
 }
 
 mitk::SurfaceInterpolationController* mitk::SurfaceInterpolationController::GetInstance()
 {
   static mitk::SurfaceInterpolationController::Pointer m_Instance;
 
   if ( m_Instance.IsNull() )
   {
     m_Instance = SurfaceInterpolationController::New();
   }
   return m_Instance;
 }
 
 void mitk::SurfaceInterpolationController::AddNewContour (mitk::Surface::Pointer newContour)
 {
   if( newContour->GetVtkPolyData()->GetNumberOfPoints() > 0)
   {
     ContourPositionInformation contourInfo = CreateContourPositionInformation(newContour);
     this->AddToInterpolationPipeline(contourInfo);
 
     this->Modified();
   }
 }
 
 void mitk::SurfaceInterpolationController::AddNewContours(std::vector<mitk::Surface::Pointer> newContours)
 {
   for (unsigned int i = 0; i < newContours.size(); ++i)
   {
     if( newContours.at(i)->GetVtkPolyData()->GetNumberOfPoints() > 0)
     {
       ContourPositionInformation contourInfo = CreateContourPositionInformation(newContours.at(i));
       this->AddToInterpolationPipeline(contourInfo);
     }
   }
   this->Modified();
 }
 
 void mitk::SurfaceInterpolationController::AddToInterpolationPipeline(ContourPositionInformation contourInfo, unsigned int ts)
 {
   int pos (-1);
   unsigned int numTimeSteps = m_SelectedSegmentation->GetTimeSteps();
   if ( ts >= numTimeSteps )
   {
     MITK_ERROR << "Invalid time step requested for interpolation pipeline.";
     return;
   }
 
   ContourPositionInformationVec2D currentContours = m_ListOfInterpolationSessions[m_SelectedSegmentation];
   ContourPositionInformationList currentContourList = currentContours[m_CurrentTimeStep];
 
   mitk::Surface* newContour = contourInfo.contour;
   for (unsigned int i = 0; i < currentContourList.size(); i++)
   {
     ContourPositionInformation contourFromList = currentContourList.at(i);
     if (ContoursCoplanar(contourInfo, contourFromList))
     {
       pos = i;
       break;
     }
   }
 
   //Don't save a new empty contour
   if (pos == -1 && newContour->GetVtkPolyData()->GetNumberOfPoints() > 0)
   {
     m_ReduceFilter->SetInput(m_ListOfInterpolationSessions[m_SelectedSegmentation][m_CurrentTimeStep].size(), newContour);
     m_ListOfInterpolationSessions[m_SelectedSegmentation][m_CurrentTimeStep].push_back(contourInfo);
   }
   else if (pos != -1 && newContour->GetVtkPolyData()->GetNumberOfPoints() > 0)
   {
     m_ListOfInterpolationSessions[m_SelectedSegmentation][m_CurrentTimeStep].at(pos) = contourInfo;
     m_ReduceFilter->SetInput(pos, newContour);
   }
   else if (newContour->GetVtkPolyData()->GetNumberOfPoints() == 0)
   {
     this->RemoveContour(contourInfo);
   }
 
   m_ReduceFilter->Update();
   m_CurrentNumberOfReducedContours = m_ReduceFilter->GetNumberOfOutputs();
 
   m_TimeSelector->SetInput( m_SelectedSegmentation );
   m_TimeSelector->SetTimeNr( m_CurrentTimeStep );
   m_TimeSelector->SetChannelNr( 0 );
   m_TimeSelector->Update();
   mitk::Image::Pointer refSegImage = m_TimeSelector->GetOutput();
 
   //m_NormalsFilter->SetSegmentationBinaryImage(m_SelectedSegmentation);//war vorher schon drin?
   m_NormalsFilter->SetSegmentationBinaryImage(refSegImage);//maybe leading to crash
   for (unsigned int i = 0; i < m_CurrentNumberOfReducedContours; i++)
   {
     m_NormalsFilter->SetInput(i, m_ReduceFilter->GetOutput(i));
     m_InterpolateSurfaceFilter->SetInput(i, m_NormalsFilter->GetOutput(i));
   }
 }
 
 bool mitk::SurfaceInterpolationController::RemoveContour(ContourPositionInformation contourInfo, unsigned int ts)
 {
   if(!m_SelectedSegmentation)
   {
     return false;
   }
 
   unsigned int numTimeSteps = m_SelectedSegmentation->GetTimeSteps();
   if ( ts >= numTimeSteps )
   {
     return false;
   }
 
   ContourPositionInformationList::iterator it = m_ListOfInterpolationSessions[m_SelectedSegmentation][m_CurrentTimeStep].begin();
   while (it !=  m_ListOfInterpolationSessions[m_SelectedSegmentation][m_CurrentTimeStep].end())
   {
     ContourPositionInformation currentContour = (*it);
     if (ContoursCoplanar(currentContour, contourInfo))
     {
       m_ListOfInterpolationSessions[m_SelectedSegmentation][m_CurrentTimeStep].erase(it);
       this->ReinitializeInterpolation();
       return true;
     }
     ++it;
   }
   return false;
 }
 
 const mitk::Surface* mitk::SurfaceInterpolationController::GetContour(ContourPositionInformation contourInfo, unsigned int ts )
 {
   if(!m_SelectedSegmentation)
   {
     return 0;
   }
 
   unsigned int numTimeSteps = m_SelectedSegmentation->GetTimeSteps();
   if ( ts >= numTimeSteps )
   {
     return 0;
   }
 
   ContourPositionInformationList contourList = m_ListOfInterpolationSessions[m_SelectedSegmentation][m_CurrentTimeStep];
   for (unsigned int i = 0; i < contourList.size(); ++i)
   {
     ContourPositionInformation currentContour = contourList.at(i);
     if (ContoursCoplanar(contourInfo, currentContour))
       return currentContour.contour;
   }
   return 0;
 }
 
 unsigned int mitk::SurfaceInterpolationController::GetNumberOfContours( unsigned int ts )
 {
   if(!m_SelectedSegmentation)
   {
     return -1;
   }
 
   unsigned int numTimeSteps = m_SelectedSegmentation->GetTimeSteps();
   if ( ts >= numTimeSteps )
   {
     return -1;
   }
 
   return m_ListOfInterpolationSessions[m_SelectedSegmentation][m_CurrentTimeStep].size();
 }
 
 void mitk::SurfaceInterpolationController::Interpolate()
 {
   if (m_CurrentNumberOfReducedContours< 2)
   {
     //If no interpolation is possible reset the interpolation result
     m_InterpolationResult = 0;
     return;
   }
 
   //Setting up progress bar
   mitk::ProgressBar::GetInstance()->AddStepsToDo(10);
 
   mitk::Image::Pointer distanceImage = m_InterpolateSurfaceFilter->GetOutput();
   mitk::DataNode::Pointer distanceImageNode = mitk::DataNode::New();
   distanceImageNode->SetData( distanceImage );
   //m_DataStorage->Add( distanceImageNode );
 
   int numContours = m_NormalsFilter->GetNumberOfOutputs();
   //vtkXMLPolyDataWriter* writer = vtkXMLPolyDataWriter::New();
   vtkPolyDataWriter* writer = vtkPolyDataWriter::New();
   //writer->SetDataModeToAscii();
 
   for ( int i=0; i < numContours; ++i )
   {
     char fileDescr[1024];
     sprintf( fileDescr, "Contour-%i.vtp", i );
 
     std::string fileName = "C:/tmp/interpol/";
     fileName.append( fileDescr );
 
     mitk::Surface::Pointer contour = m_NormalsFilter->GetOutput( i );
     vtkPolyData* poly = contour->GetVtkPolyData();
     poly->GetCellData()->AddArray( poly->GetCellData()->GetNormals() );
 
     //writer->SetInputData( contour->GetVtkPolyData() );
     writer->SetInputData( poly );
     writer->SetFileName( fileName.c_str() );
     //writer->Write();
     /*mitk::DataNode::Pointer contourNode = mitk::DataNode::New();
     contourNode->SetData( contour );
     m_DataStorage->Add( contourNode );*/
   }
 
   // create a surface from the distance-image
   mitk::ImageToSurfaceFilter::Pointer imageToSurfaceFilter = mitk::ImageToSurfaceFilter::New();
   imageToSurfaceFilter->SetInput( m_InterpolateSurfaceFilter->GetOutput() );
   imageToSurfaceFilter->SetThreshold( 0 );
   imageToSurfaceFilter->SetSmooth(true);
   imageToSurfaceFilter->SetSmoothIteration(20);
   imageToSurfaceFilter->Update();
 
   mitk::Surface::Pointer interpolationResult = mitk::Surface::New();
   interpolationResult->SetVtkPolyData( imageToSurfaceFilter->GetOutput()->GetVtkPolyData(), m_CurrentTimeStep );
   m_InterpolationResult = interpolationResult;
 
   vtkSmartPointer<vtkAppendPolyData> polyDataAppender = vtkSmartPointer<vtkAppendPolyData>::New();
   for (unsigned int i = 0; i < m_ListOfInterpolationSessions[m_SelectedSegmentation][m_CurrentTimeStep].size(); i++)
   {
     polyDataAppender->AddInputData(m_ListOfInterpolationSessions[m_SelectedSegmentation][m_CurrentTimeStep].at(i).contour->GetVtkPolyData());
   }
   polyDataAppender->Update();
   m_Contours->SetVtkPolyData(polyDataAppender->GetOutput());
 
   //Last progress step
   mitk::ProgressBar::GetInstance()->Progress(20);
 
   m_InterpolationResult->DisconnectPipeline();
 }
 
 mitk::Surface::Pointer mitk::SurfaceInterpolationController::GetInterpolationResult()
 {
     return m_InterpolationResult;
 }
 
 mitk::Surface* mitk::SurfaceInterpolationController::GetContoursAsSurface()
 {
   return m_Contours;
 }
 
 void mitk::SurfaceInterpolationController::SetDataStorage(DataStorage::Pointer ds)
 {
   m_DataStorage = ds;
 }
 
 void mitk::SurfaceInterpolationController::SetMinSpacing(double minSpacing)
 {
   m_ReduceFilter->SetMinSpacing(minSpacing);
 }
 
 void mitk::SurfaceInterpolationController::SetMaxSpacing(double maxSpacing)
 {
   m_ReduceFilter->SetMaxSpacing(maxSpacing);
   m_NormalsFilter->SetMaxSpacing(maxSpacing);
 }
 
 void mitk::SurfaceInterpolationController::SetDistanceImageVolume(unsigned int distImgVolume)
 {
   m_InterpolateSurfaceFilter->SetDistanceImageVolume(distImgVolume);
 }
 
 mitk::Image::Pointer mitk::SurfaceInterpolationController::GetCurrentSegmentation()
 {
   return m_SelectedSegmentation;
 }
 
 mitk::Image* mitk::SurfaceInterpolationController::GetImage()
 {
   return m_InterpolateSurfaceFilter->GetOutput();
 }
 
 double mitk::SurfaceInterpolationController::EstimatePortionOfNeededMemory()
 {
   double numberOfPointsAfterReduction = m_ReduceFilter->GetNumberOfPointsAfterReduction()*3;
   double sizeOfPoints = pow(numberOfPointsAfterReduction,2)*sizeof(double);
   double totalMem = mitk::MemoryUtilities::GetTotalSizeOfPhysicalRam();
   double percentage = sizeOfPoints/totalMem;
   return percentage;
 }
 
 unsigned int mitk::SurfaceInterpolationController::GetNumberOfInterpolationSessions()
 {
   return m_ListOfInterpolationSessions.size();
 }
 
 template<typename TPixel, unsigned int VImageDimension>
 void mitk::SurfaceInterpolationController::GetImageBase(itk::Image<TPixel, VImageDimension>* input, itk::ImageBase<3>::Pointer& result)
 {
   result->Graft(input);
 }
 
 void mitk::SurfaceInterpolationController::SetCurrentSegmentationInterpolationList(mitk::Image::Pointer segmentation)
 {
   this->SetCurrentInterpolationSession(segmentation);
 }
 
 void mitk::SurfaceInterpolationController::SetCurrentInterpolationSession(mitk::Image::Pointer currentSegmentationImage)
 {
   if (currentSegmentationImage.GetPointer() == m_SelectedSegmentation)
     return;
 
   if (currentSegmentationImage.IsNull())
   {
     m_SelectedSegmentation = 0;
     return;
   }
 
   m_SelectedSegmentation = currentSegmentationImage.GetPointer();
 
   ContourListMap::iterator it = m_ListOfInterpolationSessions.find(currentSegmentationImage.GetPointer());
   // If the session does not exist yet create a new ContourPositionPairList otherwise reinitialize the interpolation pipeline
   if (it == m_ListOfInterpolationSessions.end())
   {
     ContourPositionInformationVec2D newList;
     m_ListOfInterpolationSessions.insert(std::pair<mitk::Image*, ContourPositionInformationVec2D>(m_SelectedSegmentation, newList));
     m_InterpolationResult = 0;
     m_CurrentNumberOfReducedContours = 0;
 
     itk::MemberCommand<SurfaceInterpolationController>::Pointer command = itk::MemberCommand<SurfaceInterpolationController>::New();
     command->SetCallbackFunction(this, &SurfaceInterpolationController::OnSegmentationDeleted);
     m_SegmentationObserverTags.insert( std::pair<mitk::Image*, unsigned long>( m_SelectedSegmentation, m_SelectedSegmentation->AddObserver( itk::DeleteEvent(), command ) ) );
   }
 
   this->ReinitializeInterpolation();
 }
 
 bool mitk::SurfaceInterpolationController::ReplaceInterpolationSession(mitk::Image::Pointer oldSession, mitk::Image::Pointer newSession)
 {
   if (oldSession.IsNull() || newSession.IsNull())
     return false;
 
   if (oldSession.GetPointer() == newSession.GetPointer())
     return false;
 
   if (!mitk::Equal(*(oldSession->GetGeometry()), *(newSession->GetGeometry()), mitk::eps, false))
     return false;
 
   ContourListMap::iterator it = m_ListOfInterpolationSessions.find(oldSession.GetPointer());
 
   if (it == m_ListOfInterpolationSessions.end())
     return false;
 
   ContourPositionInformationVec2D oldList = (*it).second;
   m_ListOfInterpolationSessions.insert(std::pair<mitk::Image*, ContourPositionInformationVec2D>(newSession.GetPointer(), oldList));
   itk::MemberCommand<SurfaceInterpolationController>::Pointer command = itk::MemberCommand<SurfaceInterpolationController>::New();
   command->SetCallbackFunction(this, &SurfaceInterpolationController::OnSegmentationDeleted);
   m_SegmentationObserverTags.insert( std::pair<mitk::Image*, unsigned long>( newSession, newSession->AddObserver( itk::DeleteEvent(), command ) ) );
 
   if (m_SelectedSegmentation == oldSession)
     m_SelectedSegmentation = newSession;
 
   /*mitk::ImageTimeSelector::Pointer timeSelector = mitk::ImageTimeSelector::New();
   timeSelector->SetInput( m_SelectedSegmentation );
   timeSelector->SetTimeNr( m_CurrentTimeStep );
   timeSelector->SetChannelNr( 0 );
   timeSelector->Update();
   mitk::Image::Pointer refSegImage = timeSelector->GetOutput();*/
 
   //m_NormalsFilter->SetSegmentationBinaryImage(m_SelectedSegmentation);
   //m_NormalsFilter->SetSegmentationBinaryImage(refSegImage);
 
   this->RemoveInterpolationSession(oldSession);
   return true;
 }
 
 void mitk::SurfaceInterpolationController::RemoveSegmentationFromContourList(mitk::Image *segmentation)
 {
   this->RemoveInterpolationSession(segmentation);
 }
 
 void mitk::SurfaceInterpolationController::RemoveInterpolationSession(mitk::Image::Pointer segmentationImage)
 {
   if (segmentationImage)
   {
     if (m_SelectedSegmentation == segmentationImage)
     {
       m_NormalsFilter->SetSegmentationBinaryImage(NULL);
       m_SelectedSegmentation = 0;
     }
     m_ListOfInterpolationSessions.erase(segmentationImage);
     // Remove observer
     std::map<mitk::Image*, unsigned long>::iterator pos = m_SegmentationObserverTags.find(segmentationImage);
     if (pos != m_SegmentationObserverTags.end())
     {
       segmentationImage->RemoveObserver((*pos).second);
       m_SegmentationObserverTags.erase(pos);
     }
   }
 }
 
 void mitk::SurfaceInterpolationController::RemoveAllInterpolationSessions()
 {
   //Removing all observers
   std::map<mitk::Image*, unsigned long>::iterator dataIter = m_SegmentationObserverTags.begin();
   while (dataIter != m_SegmentationObserverTags.end())
   {
     mitk::Image* image = (*dataIter).first;
     image->RemoveObserver((*dataIter).second);
     ++dataIter;
   }
 
   m_SegmentationObserverTags.clear();
   m_SelectedSegmentation = 0;
   m_ListOfInterpolationSessions.clear();
 }
 
 void mitk::SurfaceInterpolationController::ReinitializeInterpolation(mitk::Surface::Pointer contours)
 {
   // 1. detect coplanar contours
   // 2. merge coplanar contours into a single surface
   // 4. add contour to pipeline
 
   // Split the surface into separate polygons
   vtkSmartPointer<vtkCellArray> existingPolys;
   vtkSmartPointer<vtkPoints> existingPoints;
   existingPolys = contours->GetVtkPolyData()->GetPolys();
   existingPoints = contours->GetVtkPolyData()->GetPoints();
   existingPolys->InitTraversal();
 
   vtkSmartPointer<vtkIdList> ids = vtkSmartPointer<vtkIdList>::New();
 
   typedef std::pair<mitk::Vector3D, mitk::Point3D> PointNormalPair;
   std::vector<ContourPositionInformation> list;
   std::vector<vtkSmartPointer<vtkPoints> > pointsList;
   int count (0);
   for( existingPolys->InitTraversal(); existingPolys->GetNextCell(ids);)
   {
     // Get the points
     vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
     existingPoints->GetPoints(ids, points);
     ++count;
     pointsList.push_back(points);
 
 
     PointNormalPair p_n;
     double n[3];
     vtkPolygon::ComputeNormal(points, n);
     p_n.first = n;
     double p[3];
 
     existingPoints->GetPoint(ids->GetId(0), p);
     p_n.second = p;
 
     ContourPositionInformation p_info;
     p_info.contourNormal = n;
     p_info.contourPoint = p;
     list.push_back(p_info);
     continue;
   }
 
   // Detect and sort coplanar polygons
   std::vector<ContourPositionInformation>::iterator outer = list.begin();
   std::vector< std::vector< vtkSmartPointer<vtkPoints> > > relatedPoints;
   while (outer != list.end())
   {
     std::vector<ContourPositionInformation>::iterator inner = outer;
     ++inner;
     std::vector< vtkSmartPointer<vtkPoints> > rel;
     std::vector< vtkSmartPointer<vtkPoints> >::iterator pointsIter = pointsList.begin();
     rel.push_back((*pointsIter));
     pointsIter = pointsList.erase(pointsIter);
 
     while (inner != list.end())
     {
       if(ContoursCoplanar((*outer),(*inner)))
       {
         inner = list.erase(inner);
         rel.push_back((*pointsIter));
         pointsIter = pointsList.erase(pointsIter);
       }
       else
       {
         ++inner;
         ++pointsIter;
       }
     }
     relatedPoints.push_back(rel);
     ++outer;
   }
 
   // Build the separate surfaces again
   std::vector<mitk::Surface::Pointer> finalSurfaces;
   for (unsigned int i = 0; i < relatedPoints.size(); ++i)
   {
     vtkSmartPointer<vtkPolyData> contourSurface = vtkSmartPointer<vtkPolyData>::New();
     vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
     vtkSmartPointer<vtkCellArray> polygons = vtkSmartPointer<vtkCellArray>::New();
     unsigned int pointId (0);
     for (unsigned int j = 0; j < relatedPoints.at(i).size(); ++j)
     {
       unsigned int numPoints = relatedPoints.at(i).at(j)->GetNumberOfPoints();
       vtkSmartPointer<vtkPolygon> polygon = vtkSmartPointer<vtkPolygon>::New();
       polygon->GetPointIds()->SetNumberOfIds(numPoints);
       polygon->GetPoints()->SetNumberOfPoints(numPoints);
       vtkSmartPointer<vtkPoints> currentPoints = relatedPoints.at(i).at(j);
       for (unsigned k = 0; k < numPoints; ++k)
       {
         points->InsertPoint(pointId, currentPoints->GetPoint(k));
         polygon->GetPointIds()->SetId(k, pointId);
         ++pointId;
       }
       polygons->InsertNextCell(polygon);
     }
     contourSurface->SetPoints(points);
     contourSurface->SetPolys(polygons);
     contourSurface->BuildLinks();
     mitk::Surface::Pointer surface = mitk::Surface::New();
     surface->SetVtkPolyData(contourSurface);
     finalSurfaces.push_back(surface);
   }
 
   // Add detected contours to interpolation pipeline
   this->AddNewContours(finalSurfaces);
 }
 
 void mitk::SurfaceInterpolationController::OnSegmentationDeleted(const itk::Object *caller, const itk::EventObject &/*event*/)
 {
   mitk::Image* tempImage = dynamic_cast<mitk::Image*>(const_cast<itk::Object*>(caller));
   if (tempImage)
   {
     if (m_SelectedSegmentation == tempImage)
     {
       m_NormalsFilter->SetSegmentationBinaryImage(NULL);
       m_SelectedSegmentation = 0;
     }
     m_SegmentationObserverTags.erase(tempImage);
     m_ListOfInterpolationSessions.erase(tempImage);
   }
 }
 
 void mitk::SurfaceInterpolationController::ReinitializeInterpolation()
 {
   //m_TimeSelector->SetInput( m_SelectedSegmentation );
   //timeSelector->SetTimeNr( m_CurrentTimeStep );
   //timeSelector->SetChannelNr( 0 );
   //timeSelector->Update();
   //mitk::Image::Pointer refSegImage = m_TimeSelector->GetOutput();
 
   ////m_NormalsFilter->SetSegmentationBinaryImage(m_SelectedSegmentation);
   //m_NormalsFilter->SetSegmentationBinaryImage(refSegImage);
 
   // If session has changed reset the pipeline
   m_ReduceFilter->Reset();
   m_NormalsFilter->Reset();
   m_InterpolateSurfaceFilter->Reset();
 
   itk::ImageBase<3>::Pointer itkImage = itk::ImageBase<3>::New();
 
   if ( m_SelectedSegmentation )
   {
     //AccessFixedDimensionByItk_1( m_SelectedSegmentation, GetImageBase, 3, itkImage );
     m_TimeSelector->SetInput( m_SelectedSegmentation );
     m_TimeSelector->Update();
     mitk::Image::Pointer refSegImage = m_TimeSelector->GetOutput();
     AccessFixedDimensionByItk_1( refSegImage, GetImageBase, 3, itkImage );
     m_InterpolateSurfaceFilter->SetReferenceImage(itkImage.GetPointer());
 
     unsigned int numTimeSteps = m_SelectedSegmentation->GetTimeSteps();
-    m_ListOfInterpolationSessions[m_SelectedSegmentation].resize( numTimeSteps );
+    unsigned int size = m_ListOfInterpolationSessions[m_SelectedSegmentation].size();
+    if ( size != numTimeSteps )
+    {
+      m_ListOfInterpolationSessions[m_SelectedSegmentation].resize( numTimeSteps );
+    }
+
     /*for (unsigned int i = 0; i < m_ListOfInterpolationSessions[m_SelectedSegmentation].size(); i++)
     {*/
-      unsigned int numContours = m_ListOfInterpolationSessions[m_SelectedSegmentation][m_CurrentTimeStep].size();
-      for ( unsigned int c = 0; c < numContours; ++c )
-      {
-        m_ReduceFilter->SetInput(c, m_ListOfInterpolationSessions[m_SelectedSegmentation][m_CurrentTimeStep][c].contour);
-      }
+
+    unsigned int numContours = m_ListOfInterpolationSessions[m_SelectedSegmentation][m_CurrentTimeStep].size();
+    for ( unsigned int c = 0; c < numContours; ++c )
+    {
+      m_ReduceFilter->SetInput(c, m_ListOfInterpolationSessions[m_SelectedSegmentation][m_CurrentTimeStep][c].contour);
+    }
+
     //}
 
     m_ReduceFilter->Update();
 
     m_CurrentNumberOfReducedContours = m_ReduceFilter->GetNumberOfOutputs();
 
     for (unsigned int i = 0; i < m_CurrentNumberOfReducedContours; i++)
     {
       m_NormalsFilter->SetInput(i, m_ReduceFilter->GetOutput(i));
       m_InterpolateSurfaceFilter->SetInput(i, m_NormalsFilter->GetOutput(i));
     }
     Modified();
   }
 }