diff --git a/Modules/DiffusionImaging/FiberTracking/IODataStructures/FiberBundleX/mitkFiberBundleX.cpp b/Modules/DiffusionImaging/FiberTracking/IODataStructures/FiberBundleX/mitkFiberBundleX.cpp
index cd192a0503..b5a612c043 100755
--- a/Modules/DiffusionImaging/FiberTracking/IODataStructures/FiberBundleX/mitkFiberBundleX.cpp
+++ b/Modules/DiffusionImaging/FiberTracking/IODataStructures/FiberBundleX/mitkFiberBundleX.cpp
@@ -1,1945 +1,1945 @@
 /*===================================================================
 
 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.
 
 ===================================================================*/
 
 
 #define _USE_MATH_DEFINES
 #include "mitkFiberBundleX.h"
 
 #include <mitkPlanarCircle.h>
 #include <mitkPlanarPolygon.h>
 #include <mitkPlanarFigureComposite.h>
 #include "mitkImagePixelReadAccessor.h"
 #include <mitkPixelTypeMultiplex.h>
 
 #include <vtkPointData.h>
 #include <vtkDataArray.h>
 #include <vtkUnsignedCharArray.h>
 #include <vtkPolyLine.h>
 #include <vtkCellArray.h>
 #include <vtkCellData.h>
 #include <vtkIdFilter.h>
 #include <vtkClipPolyData.h>
 #include <vtkPlane.h>
 #include <vtkDoubleArray.h>
 #include <vtkKochanekSpline.h>
 #include <vtkParametricFunctionSource.h>
 #include <vtkParametricSpline.h>
 #include <vtkPolygon.h>
 #include <vtkCleanPolyData.h>
 #include <cmath>
 #include <boost/progress.hpp>
 #include <vtkTransformPolyDataFilter.h>
 
 const char* mitk::FiberBundleX::COLORCODING_ORIENTATION_BASED = "Color_Orient";
 //const char* mitk::FiberBundleX::COLORCODING_FA_AS_OPACITY = "Color_Orient_FA_Opacity";
 const char* mitk::FiberBundleX::COLORCODING_FA_BASED = "FA_Values";
 const char* mitk::FiberBundleX::COLORCODING_CUSTOM = "custom";
 const char* mitk::FiberBundleX::FIBER_ID_ARRAY = "Fiber_IDs";
 
 using namespace std;
 
 mitk::FiberBundleX::FiberBundleX( vtkPolyData* fiberPolyData )
     : m_CurrentColorCoding(NULL)
     , m_NumFibers(0)
     , m_FiberSampling(0)
 {
     m_FiberPolyData = vtkSmartPointer<vtkPolyData>::New();
     if (fiberPolyData != NULL)
     {
         m_FiberPolyData = fiberPolyData;
         //m_FiberPolyData->DeepCopy(fiberPolyData);
         this->DoColorCodingOrientationBased();
     }
 
     this->UpdateFiberGeometry();
     this->SetColorCoding(COLORCODING_ORIENTATION_BASED);
     this->GenerateFiberIds();
 }
 
 mitk::FiberBundleX::~FiberBundleX()
 {
 
 }
 
 mitk::FiberBundleX::Pointer mitk::FiberBundleX::GetDeepCopy()
 {
     mitk::FiberBundleX::Pointer newFib = mitk::FiberBundleX::New(m_FiberPolyData);
     newFib->SetColorCoding(m_CurrentColorCoding);
     return newFib;
 }
 
 vtkSmartPointer<vtkPolyData> mitk::FiberBundleX::GeneratePolyDataByIds(std::vector<long> fiberIds)
 {
     MITK_DEBUG << "\n=====FINAL RESULT: fib_id ======\n";
     MITK_DEBUG << "Number of new Fibers: " << fiberIds.size();
     // iterate through the vectorcontainer hosting all desired fiber Ids
 
     vtkSmartPointer<vtkPolyData> newFiberPolyData = vtkSmartPointer<vtkPolyData>::New();
     vtkSmartPointer<vtkCellArray> newLineSet = vtkSmartPointer<vtkCellArray>::New();
     vtkSmartPointer<vtkPoints> newPointSet = vtkSmartPointer<vtkPoints>::New();
 
     // if FA array available, initialize fa double array
     // if color orient array is available init color array
     vtkSmartPointer<vtkDoubleArray> faValueArray;
     vtkSmartPointer<vtkUnsignedCharArray> colorsT;
     //colors and alpha value for each single point, RGBA = 4 components
     unsigned char rgba[4] = {0,0,0,0};
     int componentSize = sizeof(rgba);
 
     if (m_FiberIdDataSet->GetPointData()->HasArray(COLORCODING_FA_BASED)){
         MITK_DEBUG << "FA VALUES AVAILABLE, init array for new fiberbundle";
         faValueArray = vtkSmartPointer<vtkDoubleArray>::New();
     }
 
     if (m_FiberIdDataSet->GetPointData()->HasArray(COLORCODING_ORIENTATION_BASED)){
         MITK_DEBUG << "colorValues available, init array for new fiberbundle";
         colorsT = vtkUnsignedCharArray::New();
         colorsT->SetNumberOfComponents(componentSize);
         colorsT->SetName(COLORCODING_ORIENTATION_BASED);
     }
 
 
 
     std::vector<long>::iterator finIt = fiberIds.begin();
     while ( finIt != fiberIds.end() )
     {
         if (*finIt < 0 || *finIt>GetNumFibers()){
             MITK_INFO << "FiberID can not be negative or >NumFibers!!! check id Extraction!" << *finIt;
             break;
         }
 
         vtkSmartPointer<vtkCell> fiber = m_FiberIdDataSet->GetCell(*finIt);//->DeepCopy(fiber);
 
         vtkSmartPointer<vtkPoints> fibPoints = fiber->GetPoints();
 
         vtkSmartPointer<vtkPolyLine> newFiber = vtkSmartPointer<vtkPolyLine>::New();
         newFiber->GetPointIds()->SetNumberOfIds( fibPoints->GetNumberOfPoints() );
 
         for(int i=0; i<fibPoints->GetNumberOfPoints(); i++)
         {
             //            MITK_DEBUG << "id: " << fiber->GetPointId(i);
             //            MITK_DEBUG << fibPoints->GetPoint(i)[0] << " | " << fibPoints->GetPoint(i)[1] << " | " << fibPoints->GetPoint(i)[2];
             newFiber->GetPointIds()->SetId(i, newPointSet->GetNumberOfPoints());
             newPointSet->InsertNextPoint(fibPoints->GetPoint(i)[0], fibPoints->GetPoint(i)[1], fibPoints->GetPoint(i)[2]);
 
 
             if (m_FiberIdDataSet->GetPointData()->HasArray(COLORCODING_FA_BASED)){
                 //                MITK_DEBUG << m_FiberIdDataSet->GetPointData()->GetArray(FA_VALUE_ARRAY)->GetTuple(fiber->GetPointId(i));
             }
 
             if (m_FiberIdDataSet->GetPointData()->HasArray(COLORCODING_ORIENTATION_BASED)){
                 //                MITK_DEBUG << "ColorValue: " << m_FiberIdDataSet->GetPointData()->GetArray(COLORCODING_ORIENTATION_BASED)->GetTuple(fiber->GetPointId(i))[0];
             }
         }
 
         newLineSet->InsertNextCell(newFiber);
         ++finIt;
     }
 
     newFiberPolyData->SetPoints(newPointSet);
     newFiberPolyData->SetLines(newLineSet);
     MITK_DEBUG << "new fiberbundle polydata points: " << newFiberPolyData->GetNumberOfPoints();
     MITK_DEBUG << "new fiberbundle polydata lines: " << newFiberPolyData->GetNumberOfLines();
     MITK_DEBUG << "=====================\n";
 
     //    mitk::FiberBundleX::Pointer newFib = mitk::FiberBundleX::New(newFiberPolyData);
     return newFiberPolyData;
 }
 
 // merge two fiber bundles
 mitk::FiberBundleX::Pointer mitk::FiberBundleX::AddBundle(mitk::FiberBundleX* fib)
 {
     if (fib==NULL)
     {
         MITK_WARN << "trying to call AddBundle with NULL argument";
         return NULL;
     }
     MITK_INFO << "Adding fibers";
 
     vtkSmartPointer<vtkPolyData> vNewPolyData = vtkSmartPointer<vtkPolyData>::New();
     vtkSmartPointer<vtkCellArray> vNewLines = vtkSmartPointer<vtkCellArray>::New();
     vtkSmartPointer<vtkPoints> vNewPoints = vtkSmartPointer<vtkPoints>::New();
 
     // add current fiber bundle
     for (int i=0; i<m_FiberPolyData->GetNumberOfCells(); i++)
     {
         vtkCell* cell = m_FiberPolyData->GetCell(i);
         int numPoints = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
 
         vtkSmartPointer<vtkPolyLine> container = vtkSmartPointer<vtkPolyLine>::New();
         for (int j=0; j<numPoints; j++)
         {
             double p[3];
             points->GetPoint(j, p);
 
             vtkIdType id = vNewPoints->InsertNextPoint(p);
             container->GetPointIds()->InsertNextId(id);
         }
         vNewLines->InsertNextCell(container);
     }
 
     // add new fiber bundle
     for (int i=0; i<fib->GetFiberPolyData()->GetNumberOfCells(); i++)
     {
         vtkCell* cell = fib->GetFiberPolyData()->GetCell(i);
         int numPoints = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
 
         vtkSmartPointer<vtkPolyLine> container = vtkSmartPointer<vtkPolyLine>::New();
         for (int j=0; j<numPoints; j++)
         {
             double p[3];
             points->GetPoint(j, p);
 
             vtkIdType id = vNewPoints->InsertNextPoint(p);
             container->GetPointIds()->InsertNextId(id);
         }
         vNewLines->InsertNextCell(container);
     }
 
     // initialize polydata
     vNewPolyData->SetPoints(vNewPoints);
     vNewPolyData->SetLines(vNewLines);
 
     // initialize fiber bundle
     mitk::FiberBundleX::Pointer newFib = mitk::FiberBundleX::New(vNewPolyData);
     return newFib;
 }
 
 // subtract two fiber bundles
 mitk::FiberBundleX::Pointer mitk::FiberBundleX::SubtractBundle(mitk::FiberBundleX* fib)
 {
     MITK_INFO << "Subtracting fibers";
 
     vtkSmartPointer<vtkPolyData> vNewPolyData = vtkSmartPointer<vtkPolyData>::New();
     vtkSmartPointer<vtkCellArray> vNewLines = vtkSmartPointer<vtkCellArray>::New();
     vtkSmartPointer<vtkPoints> vNewPoints = vtkSmartPointer<vtkPoints>::New();
 
     // iterate over current fibers
     boost::progress_display disp(m_NumFibers);
     for( int i=0; i<m_NumFibers; i++ )
     {
         ++disp;
         vtkCell* cell = m_FiberPolyData->GetCell(i);
         int numPoints = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
 
         if (points==NULL || numPoints<=0)
             continue;
 
         int numFibers2 = fib->GetNumFibers();
         bool contained = false;
         for( int i2=0; i2<numFibers2; i2++ )
         {
             vtkCell* cell2 = fib->GetFiberPolyData()->GetCell(i2);
             int numPoints2 = cell2->GetNumberOfPoints();
             vtkPoints* points2 = cell2->GetPoints();
 
             if (points2==NULL)// || numPoints2<=0)
                 continue;
 
             // check endpoints
             if (numPoints2==numPoints)
             {
                 itk::Point<float, 3> point_start = GetItkPoint(points->GetPoint(0));
                 itk::Point<float, 3> point_end = GetItkPoint(points->GetPoint(numPoints-1));
                 itk::Point<float, 3> point2_start = GetItkPoint(points2->GetPoint(0));
                 itk::Point<float, 3> point2_end = GetItkPoint(points2->GetPoint(numPoints2-1));
 
                 if ((point_start.SquaredEuclideanDistanceTo(point2_start)<=mitk::eps && point_end.SquaredEuclideanDistanceTo(point2_end)<=mitk::eps) ||
                         (point_start.SquaredEuclideanDistanceTo(point2_end)<=mitk::eps && point_end.SquaredEuclideanDistanceTo(point2_start)<=mitk::eps))
                 {
                     // further checking ???
                     contained = true;
                     break;
                 }
             }
         }
 
         // add to result because fiber is not subtracted
         if (!contained)
         {
             vtkSmartPointer<vtkPolyLine> container = vtkSmartPointer<vtkPolyLine>::New();
             for( int j=0; j<numPoints; j++)
             {
                 vtkIdType id = vNewPoints->InsertNextPoint(points->GetPoint(j));
                 container->GetPointIds()->InsertNextId(id);
             }
             vNewLines->InsertNextCell(container);
         }
     }
     if(vNewLines->GetNumberOfCells()==0)
         return NULL;
     // initialize polydata
     vNewPolyData->SetPoints(vNewPoints);
     vNewPolyData->SetLines(vNewLines);
 
     // initialize fiber bundle
     return mitk::FiberBundleX::New(vNewPolyData);
 }
 
 itk::Point<float, 3> mitk::FiberBundleX::GetItkPoint(double point[3])
 {
     itk::Point<float, 3> itkPoint;
     itkPoint[0] = point[0];
     itkPoint[1] = point[1];
     itkPoint[2] = point[2];
     return itkPoint;
 }
 
 /*
  * set polydata (additional flag to recompute fiber geometry, default = true)
  */
 void mitk::FiberBundleX::SetFiberPolyData(vtkSmartPointer<vtkPolyData> fiberPD, bool updateGeometry)
 {
     if (fiberPD == NULL)
         this->m_FiberPolyData = vtkSmartPointer<vtkPolyData>::New();
     else
     {
         m_FiberPolyData->DeepCopy(fiberPD);
         DoColorCodingOrientationBased();
     }
 
     m_NumFibers = m_FiberPolyData->GetNumberOfLines();
 
     if (updateGeometry)
         UpdateFiberGeometry();
     SetColorCoding(COLORCODING_ORIENTATION_BASED);
     GenerateFiberIds();
 }
 
 /*
  * return vtkPolyData
  */
-vtkSmartPointer<vtkPolyData> mitk::FiberBundleX::GetFiberPolyData()
+vtkSmartPointer<vtkPolyData> mitk::FiberBundleX::GetFiberPolyData() const
 {
     return m_FiberPolyData;
 }
 
 void mitk::FiberBundleX::DoColorCodingOrientationBased()
 {
     //===== FOR WRITING A TEST ========================
     //  colorT size == tupelComponents * tupelElements
     //  compare color results
     //  to cover this code 100% also polydata needed, where colorarray already exists
     //  + one fiber with exactly 1 point
     //  + one fiber with 0 points
     //=================================================
 
     /*  make sure that processing colorcoding is only called when necessary */
     if ( m_FiberPolyData->GetPointData()->HasArray(COLORCODING_ORIENTATION_BASED) &&
          m_FiberPolyData->GetNumberOfPoints() ==
          m_FiberPolyData->GetPointData()->GetArray(COLORCODING_ORIENTATION_BASED)->GetNumberOfTuples() )
     {
         // fiberstructure is already colorcoded
         MITK_DEBUG << " NO NEED TO REGENERATE COLORCODING! " ;
         this->ResetFiberOpacity();
         this->SetColorCoding(COLORCODING_ORIENTATION_BASED);
         return;
     }
 
     /* Finally, execute color calculation */
     vtkPoints* extrPoints = NULL;
     extrPoints = m_FiberPolyData->GetPoints();
     int numOfPoints = 0;
     if (extrPoints!=NULL)
         numOfPoints = extrPoints->GetNumberOfPoints();
 
     //colors and alpha value for each single point, RGBA = 4 components
     unsigned char rgba[4] = {0,0,0,0};
     //    int componentSize = sizeof(rgba);
     int componentSize = 4;
 
     vtkSmartPointer<vtkUnsignedCharArray> colorsT = vtkSmartPointer<vtkUnsignedCharArray>::New();
     colorsT->Allocate(numOfPoints * componentSize);
     colorsT->SetNumberOfComponents(componentSize);
     colorsT->SetName(COLORCODING_ORIENTATION_BASED);
 
     /* checkpoint: does polydata contain any fibers */
     int numOfFibers = m_FiberPolyData->GetNumberOfLines();
     if (numOfFibers < 1)
         return;
 
     /* extract single fibers of fiberBundle */
     vtkCellArray* fiberList = m_FiberPolyData->GetLines();
     fiberList->InitTraversal();
     for (int fi=0; fi<numOfFibers; ++fi) {
 
         vtkIdType* idList; // contains the point id's of the line
         vtkIdType pointsPerFiber; // number of points for current line
         fiberList->GetNextCell(pointsPerFiber, idList);
 
         /* single fiber checkpoints: is number of points valid */
         if (pointsPerFiber > 1)
         {
             /* operate on points of single fiber */
             for (int i=0; i <pointsPerFiber; ++i)
             {
                 /* process all points except starting and endpoint for calculating color value take current point, previous point and next point */
                 if (i<pointsPerFiber-1 && i > 0)
                 {
                     /* The color value of the current point is influenced by the previous point and next point. */
                     vnl_vector_fixed< double, 3 > currentPntvtk(extrPoints->GetPoint(idList[i])[0], extrPoints->GetPoint(idList[i])[1],extrPoints->GetPoint(idList[i])[2]);
                     vnl_vector_fixed< double, 3 > nextPntvtk(extrPoints->GetPoint(idList[i+1])[0], extrPoints->GetPoint(idList[i+1])[1], extrPoints->GetPoint(idList[i+1])[2]);
                     vnl_vector_fixed< double, 3 > prevPntvtk(extrPoints->GetPoint(idList[i-1])[0], extrPoints->GetPoint(idList[i-1])[1], extrPoints->GetPoint(idList[i-1])[2]);
 
                     vnl_vector_fixed< double, 3 > diff1;
                     diff1 = currentPntvtk - nextPntvtk;
 
                     vnl_vector_fixed< double, 3 > diff2;
                     diff2 = currentPntvtk - prevPntvtk;
 
                     vnl_vector_fixed< double, 3 > diff;
                     diff = (diff1 - diff2) / 2.0;
                     diff.normalize();
 
                     rgba[0] = (unsigned char) (255.0 * std::fabs(diff[0]));
                     rgba[1] = (unsigned char) (255.0 * std::fabs(diff[1]));
                     rgba[2] = (unsigned char) (255.0 * std::fabs(diff[2]));
                     rgba[3] = (unsigned char) (255.0);
                 }
                 else if (i==0)
                 {
                     /* First point has no previous point, therefore only diff1 is taken */
 
                     vnl_vector_fixed< double, 3 > currentPntvtk(extrPoints->GetPoint(idList[i])[0], extrPoints->GetPoint(idList[i])[1],extrPoints->GetPoint(idList[i])[2]);
                     vnl_vector_fixed< double, 3 > nextPntvtk(extrPoints->GetPoint(idList[i+1])[0], extrPoints->GetPoint(idList[i+1])[1], extrPoints->GetPoint(idList[i+1])[2]);
 
                     vnl_vector_fixed< double, 3 > diff1;
                     diff1 = currentPntvtk - nextPntvtk;
                     diff1.normalize();
 
                     rgba[0] = (unsigned char) (255.0 * std::fabs(diff1[0]));
                     rgba[1] = (unsigned char) (255.0 * std::fabs(diff1[1]));
                     rgba[2] = (unsigned char) (255.0 * std::fabs(diff1[2]));
                     rgba[3] = (unsigned char) (255.0);
                 }
                 else if (i==pointsPerFiber-1)
                 {
                     /* Last point has no next point, therefore only diff2 is taken */
                     vnl_vector_fixed< double, 3 > currentPntvtk(extrPoints->GetPoint(idList[i])[0], extrPoints->GetPoint(idList[i])[1],extrPoints->GetPoint(idList[i])[2]);
                     vnl_vector_fixed< double, 3 > prevPntvtk(extrPoints->GetPoint(idList[i-1])[0], extrPoints->GetPoint(idList[i-1])[1], extrPoints->GetPoint(idList[i-1])[2]);
 
                     vnl_vector_fixed< double, 3 > diff2;
                     diff2 = currentPntvtk - prevPntvtk;
                     diff2.normalize();
 
                     rgba[0] = (unsigned char) (255.0 * std::fabs(diff2[0]));
                     rgba[1] = (unsigned char) (255.0 * std::fabs(diff2[1]));
                     rgba[2] = (unsigned char) (255.0 * std::fabs(diff2[2]));
                     rgba[3] = (unsigned char) (255.0);
 
                 }
                 colorsT->InsertTupleValue(idList[i], rgba);
             } //end for loop
         }
         else if (pointsPerFiber == 1)
         {
             /* a single point does not define a fiber (use vertex mechanisms instead */
             continue;
         }
         else
         {
             MITK_DEBUG << "Fiber with 0 points detected... please check your tractography algorithm!" ;
             continue;
         }
     }//end for loop
 
     m_FiberPolyData->GetPointData()->AddArray(colorsT);
 
     this->SetColorCoding(COLORCODING_ORIENTATION_BASED);
 
     //mini test, shall be ported to MITK TESTINGS!
     if (colorsT->GetSize() != numOfPoints*componentSize)
         MITK_DEBUG << "ALLOCATION ERROR IN INITIATING COLOR ARRAY";
 }
 
 void mitk::FiberBundleX::DoColorCodingFaBased()
 {
     if(m_FiberPolyData->GetPointData()->HasArray(COLORCODING_FA_BASED) != 1 )
         return;
 
     this->SetColorCoding(COLORCODING_FA_BASED);
 //    this->GenerateFiberIds();
 }
 
 void mitk::FiberBundleX::DoUseFaFiberOpacity()
 {
     if(m_FiberPolyData->GetPointData()->HasArray(COLORCODING_FA_BASED) != 1 )
         return;
 
     if(m_FiberPolyData->GetPointData()->HasArray(COLORCODING_ORIENTATION_BASED) != 1 )
         return;
 
     vtkDoubleArray* FAValArray = (vtkDoubleArray*) m_FiberPolyData->GetPointData()->GetArray(COLORCODING_FA_BASED);
     vtkUnsignedCharArray* ColorArray = dynamic_cast<vtkUnsignedCharArray*>  (m_FiberPolyData->GetPointData()->GetArray(COLORCODING_ORIENTATION_BASED));
 
     for(long i=0; i<ColorArray->GetNumberOfTuples(); i++) {
         double faValue = FAValArray->GetValue(i);
         faValue = faValue * 255.0;
         ColorArray->SetComponent(i,3, (unsigned char) faValue );
     }
 
     this->SetColorCoding(COLORCODING_ORIENTATION_BASED);
 //    this->GenerateFiberIds();
 }
 
 void mitk::FiberBundleX::ResetFiberOpacity() {
     vtkUnsignedCharArray* ColorArray = dynamic_cast<vtkUnsignedCharArray*>  (m_FiberPolyData->GetPointData()->GetArray(COLORCODING_ORIENTATION_BASED));
     if (ColorArray==NULL)
         return;
     for(long i=0; i<ColorArray->GetNumberOfTuples(); i++)
         ColorArray->SetComponent(i,3, 255.0 );
 }
 
 void mitk::FiberBundleX::SetFAMap(mitk::Image::Pointer FAimage)
 {
     mitkPixelTypeMultiplex1( SetFAMap, FAimage->GetPixelType(), FAimage );
 }
 
 template <typename TPixel>
 void mitk::FiberBundleX::SetFAMap(const mitk::PixelType, mitk::Image::Pointer FAimage)
 {
     MITK_DEBUG << "SetFAMap";
     vtkSmartPointer<vtkDoubleArray> faValues = vtkSmartPointer<vtkDoubleArray>::New();
     faValues->SetName(COLORCODING_FA_BASED);
     faValues->Allocate(m_FiberPolyData->GetNumberOfPoints());
     faValues->SetNumberOfValues(m_FiberPolyData->GetNumberOfPoints());
 
     mitk::ImagePixelReadAccessor<TPixel,3> readFAimage (FAimage, FAimage->GetVolumeData(0));
 
     vtkPoints* pointSet = m_FiberPolyData->GetPoints();
     for(long i=0; i<m_FiberPolyData->GetNumberOfPoints(); ++i)
     {
         Point3D px;
         px[0] = pointSet->GetPoint(i)[0];
         px[1] = pointSet->GetPoint(i)[1];
         px[2] = pointSet->GetPoint(i)[2];
         double faPixelValue = 1-readFAimage.GetPixelByWorldCoordinates(px);
         faValues->InsertValue(i, faPixelValue);
     }
 
     m_FiberPolyData->GetPointData()->AddArray(faValues);
     this->GenerateFiberIds();
 
     if(m_FiberPolyData->GetPointData()->HasArray(COLORCODING_FA_BASED))
         MITK_DEBUG << "FA VALUE ARRAY SET";
 
 }
 
 
 void mitk::FiberBundleX::GenerateFiberIds()
 {
     if (m_FiberPolyData == NULL)
         return;
 
     vtkSmartPointer<vtkIdFilter> idFiberFilter = vtkSmartPointer<vtkIdFilter>::New();
     idFiberFilter->SetInputData(m_FiberPolyData);
     idFiberFilter->CellIdsOn();
     //  idFiberFilter->PointIdsOn(); // point id's are not needed
     idFiberFilter->SetIdsArrayName(FIBER_ID_ARRAY);
     idFiberFilter->FieldDataOn();
     idFiberFilter->Update();
 
     m_FiberIdDataSet = idFiberFilter->GetOutput();
 
     MITK_DEBUG << "Generating Fiber Ids...[done] | " << m_FiberIdDataSet->GetNumberOfCells();
 
 }
 
 mitk::FiberBundleX::Pointer mitk::FiberBundleX::ExtractFiberSubset(ItkUcharImgType* mask, bool anyPoint, bool invert)
 {
     vtkSmartPointer<vtkPolyData> polyData = m_FiberPolyData;
     if (anyPoint)
     {
         float minSpacing = 1;
         if(mask->GetSpacing()[0]<mask->GetSpacing()[1] && mask->GetSpacing()[0]<mask->GetSpacing()[2])
             minSpacing = mask->GetSpacing()[0];
         else if (mask->GetSpacing()[1] < mask->GetSpacing()[2])
             minSpacing = mask->GetSpacing()[1];
         else
             minSpacing = mask->GetSpacing()[2];
 
         mitk::FiberBundleX::Pointer fibCopy = this->GetDeepCopy();
         fibCopy->ResampleFibers(minSpacing/5);
         polyData = fibCopy->GetFiberPolyData();
     }
     vtkSmartPointer<vtkPoints> vtkNewPoints = vtkSmartPointer<vtkPoints>::New();
     vtkSmartPointer<vtkCellArray> vtkNewCells = vtkSmartPointer<vtkCellArray>::New();
 
     MITK_INFO << "Extracting fibers";
     boost::progress_display disp(m_NumFibers);
     for (int i=0; i<m_NumFibers; i++)
     {
         ++disp;
 
         vtkCell* cell = polyData->GetCell(i);
         int numPoints = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
 
         vtkCell* cellOriginal = m_FiberPolyData->GetCell(i);
         int numPointsOriginal = cellOriginal->GetNumberOfPoints();
         vtkPoints* pointsOriginal = cellOriginal->GetPoints();
 
         vtkSmartPointer<vtkPolyLine> container = vtkSmartPointer<vtkPolyLine>::New();
 
         if (numPoints>1 && numPointsOriginal)
         {
             if (anyPoint)
             {
                 if (!invert)
                 {
                     for (int j=0; j<numPoints; j++)
                     {
                         double* p = points->GetPoint(j);
 
                         itk::Point<float, 3> itkP;
                         itkP[0] = p[0]; itkP[1] = p[1]; itkP[2] = p[2];
                         itk::Index<3> idx;
                         mask->TransformPhysicalPointToIndex(itkP, idx);
 
                         if ( mask->GetPixel(idx)>0 && mask->GetLargestPossibleRegion().IsInside(idx) )
                         {
                             for (int k=0; k<numPointsOriginal; k++)
                             {
                                 double* p = pointsOriginal->GetPoint(k);
                                 vtkIdType id = vtkNewPoints->InsertNextPoint(p);
                                 container->GetPointIds()->InsertNextId(id);
                             }
                             break;
                         }
                     }
                 }
                 else
                 {
                     bool includeFiber = true;
                     for (int j=0; j<numPoints; j++)
                     {
                         double* p = points->GetPoint(j);
 
                         itk::Point<float, 3> itkP;
                         itkP[0] = p[0]; itkP[1] = p[1]; itkP[2] = p[2];
                         itk::Index<3> idx;
                         mask->TransformPhysicalPointToIndex(itkP, idx);
 
                         if ( mask->GetPixel(idx)>0 && mask->GetLargestPossibleRegion().IsInside(idx) )
                         {
                             includeFiber = false;
                             break;
                         }
                     }
                     if (includeFiber)
                     {
 
                         for (int k=0; k<numPointsOriginal; k++)
                         {
                             double* p = pointsOriginal->GetPoint(k);
                             vtkIdType id = vtkNewPoints->InsertNextPoint(p);
                             container->GetPointIds()->InsertNextId(id);
                         }
                     }
                 }
             }
             else
             {
                 double* start = pointsOriginal->GetPoint(0);
                 itk::Point<float, 3> itkStart;
                 itkStart[0] = start[0]; itkStart[1] = start[1]; itkStart[2] = start[2];
                 itk::Index<3> idxStart;
                 mask->TransformPhysicalPointToIndex(itkStart, idxStart);
 
                 double* end = pointsOriginal->GetPoint(numPointsOriginal-1);
                 itk::Point<float, 3> itkEnd;
                 itkEnd[0] = end[0]; itkEnd[1] = end[1]; itkEnd[2] = end[2];
                 itk::Index<3> idxEnd;
                 mask->TransformPhysicalPointToIndex(itkEnd, idxEnd);
 
                 if ( mask->GetPixel(idxStart)>0 && mask->GetPixel(idxEnd)>0 && mask->GetLargestPossibleRegion().IsInside(idxStart) && mask->GetLargestPossibleRegion().IsInside(idxEnd) )
                 {
                     for (int j=0; j<numPointsOriginal; j++)
                     {
                         double* p = pointsOriginal->GetPoint(j);
                         vtkIdType id = vtkNewPoints->InsertNextPoint(p);
                         container->GetPointIds()->InsertNextId(id);
                     }
                 }
             }
         }
 
         vtkNewCells->InsertNextCell(container);
     }
 
     if (vtkNewCells->GetNumberOfCells()<=0)
         return NULL;
 
     vtkSmartPointer<vtkPolyData> newPolyData = vtkSmartPointer<vtkPolyData>::New();
     newPolyData->SetPoints(vtkNewPoints);
     newPolyData->SetLines(vtkNewCells);
     return mitk::FiberBundleX::New(newPolyData);
 }
 
 mitk::FiberBundleX::Pointer mitk::FiberBundleX::RemoveFibersOutside(ItkUcharImgType* mask, bool invert)
 {
     float minSpacing = 1;
     if(mask->GetSpacing()[0]<mask->GetSpacing()[1] && mask->GetSpacing()[0]<mask->GetSpacing()[2])
         minSpacing = mask->GetSpacing()[0];
     else if (mask->GetSpacing()[1] < mask->GetSpacing()[2])
         minSpacing = mask->GetSpacing()[1];
     else
         minSpacing = mask->GetSpacing()[2];
 
     mitk::FiberBundleX::Pointer fibCopy = this->GetDeepCopy();
     fibCopy->ResampleFibers(minSpacing/10);
     vtkSmartPointer<vtkPolyData> polyData =fibCopy->GetFiberPolyData();
 
     vtkSmartPointer<vtkPoints> vtkNewPoints = vtkSmartPointer<vtkPoints>::New();
     vtkSmartPointer<vtkCellArray> vtkNewCells = vtkSmartPointer<vtkCellArray>::New();
 
     MITK_INFO << "Cutting fibers";
     boost::progress_display disp(m_NumFibers);
     for (int i=0; i<m_NumFibers; i++)
     {
         ++disp;
 
         vtkCell* cell = polyData->GetCell(i);
         int numPoints = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
 
         vtkSmartPointer<vtkPolyLine> container = vtkSmartPointer<vtkPolyLine>::New();
         if (numPoints>1)
         {
             int newNumPoints = 0;
             for (int j=0; j<numPoints; j++)
             {
                 double* p = points->GetPoint(j);
 
                 itk::Point<float, 3> itkP;
                 itkP[0] = p[0]; itkP[1] = p[1]; itkP[2] = p[2];
                 itk::Index<3> idx;
                 mask->TransformPhysicalPointToIndex(itkP, idx);
 
                 if ( mask->GetPixel(idx)>0 && mask->GetLargestPossibleRegion().IsInside(idx) && !invert )
                 {
                     vtkIdType id = vtkNewPoints->InsertNextPoint(p);
                     container->GetPointIds()->InsertNextId(id);
                     newNumPoints++;
                 }
                 else if ( (mask->GetPixel(idx)<=0 || !mask->GetLargestPossibleRegion().IsInside(idx)) && invert )
                 {
                     vtkIdType id = vtkNewPoints->InsertNextPoint(p);
                     container->GetPointIds()->InsertNextId(id);
                     newNumPoints++;
                 }
                 else if (newNumPoints>0)
                 {
                     vtkNewCells->InsertNextCell(container);
 
                     newNumPoints = 0;
                     container = vtkSmartPointer<vtkPolyLine>::New();
                 }
             }
 
             if (newNumPoints>0)
                 vtkNewCells->InsertNextCell(container);
         }
 
     }
 
     if (vtkNewCells->GetNumberOfCells()<=0)
         return NULL;
 
     vtkSmartPointer<vtkPolyData> newPolyData = vtkSmartPointer<vtkPolyData>::New();
     newPolyData->SetPoints(vtkNewPoints);
     newPolyData->SetLines(vtkNewCells);
     mitk::FiberBundleX::Pointer newFib = mitk::FiberBundleX::New(newPolyData);
     newFib->ResampleFibers(minSpacing/2);
     return newFib;
 }
 
 mitk::FiberBundleX::Pointer mitk::FiberBundleX::ExtractFiberSubset(BaseData* roi)
 {
     if (roi==NULL || !(dynamic_cast<PlanarFigure*>(roi) || dynamic_cast<PlanarFigureComposite*>(roi)) )
         return NULL;
 
     std::vector<long> tmp = ExtractFiberIdSubset(roi);
 
     if (tmp.size()<=0)
         return mitk::FiberBundleX::New();
     vtkSmartPointer<vtkPolyData> pTmp = GeneratePolyDataByIds(tmp);
     return mitk::FiberBundleX::New(pTmp);
 }
 
 std::vector<long> mitk::FiberBundleX::ExtractFiberIdSubset(BaseData* roi)
 {
     std::vector<long> result;
     if (roi==NULL)
         return result;
 
     mitk::PlanarFigureComposite::Pointer pfc = dynamic_cast<mitk::PlanarFigureComposite*>(roi);
     if (!pfc.IsNull()) // handle composite
     {
         switch (pfc->getOperationType())
         {
         case 0: // AND
         {
             result = this->ExtractFiberIdSubset(pfc->getChildAt(0));
             std::vector<long>::iterator it;
             for (int i=1; i<pfc->getNumberOfChildren(); ++i)
             {
                 std::vector<long> inRoi = this->ExtractFiberIdSubset(pfc->getChildAt(i));
 
                 std::vector<long> rest(std::min(result.size(),inRoi.size()));
                 it = std::set_intersection(result.begin(), result.end(), inRoi.begin(), inRoi.end(), rest.begin() );
                 rest.resize( it - rest.begin() );
                 result = rest;
             }
             break;
         }
         case 1: // OR
         {
             result = ExtractFiberIdSubset(pfc->getChildAt(0));
             std::vector<long>::iterator it;
             for (int i=1; i<pfc->getNumberOfChildren(); ++i)
             {
                 it = result.end();
                 std::vector<long> inRoi = ExtractFiberIdSubset(pfc->getChildAt(i));
                 result.insert(it, inRoi.begin(), inRoi.end());
             }
 
             // remove duplicates
             sort(result.begin(), result.end());
             it = unique(result.begin(), result.end());
             result.resize( it - result.begin() );
             break;
         }
         case 2: // NOT
         {
             for(long i=0; i<this->GetNumFibers(); i++)
                 result.push_back(i);
 
             std::vector<long>::iterator it;
             for (long i=0; i<pfc->getNumberOfChildren(); ++i)
             {
                 std::vector<long> inRoi = ExtractFiberIdSubset(pfc->getChildAt(i));
 
                 std::vector<long> rest(result.size()-inRoi.size());
                 it = std::set_difference(result.begin(), result.end(), inRoi.begin(), inRoi.end(), rest.begin() );
                 rest.resize( it - rest.begin() );
                 result = rest;
             }
             break;
         }
         }
     }
     else if ( dynamic_cast<mitk::PlanarFigure*>(roi) )  // actual extraction
     {
         mitk::PlanarFigure::Pointer planarFigure = dynamic_cast<mitk::PlanarFigure*>(roi);
         Vector3D planeNormal = planarFigure->GetPlaneGeometry()->GetNormal();
         planeNormal.Normalize();
         Point3D planeOrigin = planarFigure->GetPlaneGeometry()->GetOrigin();
 
         // define cutting plane by ROI geometry (PlanarFigure)
         vtkSmartPointer<vtkPlane> plane = vtkSmartPointer<vtkPlane>::New();
         plane->SetOrigin(planeOrigin[0],planeOrigin[1],planeOrigin[2]);
         plane->SetNormal(planeNormal[0],planeNormal[1],planeNormal[2]);
 
         // get all fiber/plane intersection points
         vtkSmartPointer<vtkClipPolyData> clipper = vtkSmartPointer<vtkClipPolyData>::New();
         clipper->SetInputData(m_FiberIdDataSet);
         clipper->SetClipFunction(plane);
         clipper->GenerateClipScalarsOn();
         clipper->GenerateClippedOutputOn();
         clipper->Update();
         vtkSmartPointer<vtkPolyData> clipperout = clipper->GetClippedOutput();
         if (!clipperout->GetCellData()->HasArray(FIBER_ID_ARRAY))
             return result;
 
         vtkSmartPointer<vtkDataArray> distanceList = clipperout->GetPointData()->GetScalars();
         vtkIdType numPoints =  distanceList->GetNumberOfTuples();
 
         std::vector<int> pointsOnPlane;
         pointsOnPlane.reserve(numPoints);
         for (int i=0; i<numPoints; ++i)
         {
             double distance = distanceList->GetTuple(i)[0];
             // check if point is on plane
             if (distance >= -0.01 && distance <= 0.01)
                 pointsOnPlane.push_back(i);
         }
         if (pointsOnPlane.empty())
             return result;
 
         // get all point IDs inside the ROI
         std::vector<int> pointsInROI;
         pointsInROI.reserve(pointsOnPlane.size());
         mitk::PlanarCircle::Pointer circleName = mitk::PlanarCircle::New();
         mitk::PlanarPolygon::Pointer polyName = mitk::PlanarPolygon::New();
         if ( planarFigure->GetNameOfClass() == circleName->GetNameOfClass() )
         {
             //calculate circle radius
             mitk::Point3D V1w = planarFigure->GetWorldControlPoint(0); //centerPoint
             mitk::Point3D V2w  = planarFigure->GetWorldControlPoint(1); //radiusPoint
 
             double radius = V1w.EuclideanDistanceTo(V2w);
             radius *= radius;
 
             for (unsigned int i=0; i<pointsOnPlane.size(); i++)
             {
                 double p[3]; clipperout->GetPoint(pointsOnPlane[i], p);
                 double dist = (p[0]-V1w[0])*(p[0]-V1w[0])+(p[1]-V1w[1])*(p[1]-V1w[1])+(p[2]-V1w[2])*(p[2]-V1w[2]);
                 if( dist <= radius)
                     pointsInROI.push_back(pointsOnPlane[i]);
             }
         }
         else if ( planarFigure->GetNameOfClass() == polyName->GetNameOfClass() )
         {
             //create vtkPolygon using controlpoints from planarFigure polygon
             vtkSmartPointer<vtkPolygon> polygonVtk = vtkSmartPointer<vtkPolygon>::New();
             for (unsigned int i=0; i<planarFigure->GetNumberOfControlPoints(); ++i)
             {
                 itk::Point<double,3> p = planarFigure->GetWorldControlPoint(i);
                 polygonVtk->GetPoints()->InsertNextPoint(p[0], p[1], p[2] );
             }
             //prepare everything for using pointInPolygon function
             double n[3];
             polygonVtk->ComputeNormal(polygonVtk->GetPoints()->GetNumberOfPoints(), static_cast<double*>(polygonVtk->GetPoints()->GetData()->GetVoidPointer(0)), n);
             double bounds[6];
             polygonVtk->GetPoints()->GetBounds(bounds);
 
             for (unsigned int i=0; i<pointsOnPlane.size(); i++)
             {
                 double p[3]; clipperout->GetPoint(pointsOnPlane[i], p);
                 int isInPolygon = polygonVtk->PointInPolygon(p, polygonVtk->GetPoints()->GetNumberOfPoints(), static_cast<double*>(polygonVtk->GetPoints()->GetData()->GetVoidPointer(0)), bounds, n);
                 if( isInPolygon )
                     pointsInROI.push_back(pointsOnPlane[i]);
             }
         }
         if (pointsInROI.empty())
             return result;
 
         // get the fiber IDs corresponding to all clipped points
         std::vector< long > pointToFiberMap; // pointToFiberMap[PointID] = FiberIndex
         pointToFiberMap.resize(clipperout->GetNumberOfPoints());
 
         vtkCellArray* clipperlines = clipperout->GetLines();
         clipperlines->InitTraversal();
         for (int i=0, ic=0 ; i<clipperlines->GetNumberOfCells(); i++, ic+=3)
         {
             // ic is the index counter for the cells hosting the desired information. each cell consits of 3 items.
             long fiberID = clipperout->GetCellData()->GetArray(FIBER_ID_ARRAY)->GetTuple(i)[0];
             vtkIdType numPoints;
             vtkIdType* pointIDs;
             clipperlines->GetCell(ic, numPoints, pointIDs);
 
             for (long j=0; j<numPoints; j++)
                 pointToFiberMap[ pointIDs[j] ] = fiberID;
         }
 
         // get the fiber IDs corresponding to the ID of a point inside the ROI
         result.reserve(pointsInROI.size());
         for (unsigned long k = 0; k < pointsInROI.size(); k++)
         {
             if (pointToFiberMap[pointsInROI[k]]<=GetNumFibers() && pointToFiberMap[pointsInROI[k]]>=0)
                 result.push_back( pointToFiberMap[pointsInROI[k]] );
             else
                 MITK_INFO << "ERROR in ExtractFiberIdSubset; impossible fiber id detected";
         }
 
         // remove duplicates
         std::vector<long>::iterator it;
         sort(result.begin(), result.end());
         it = unique (result.begin(), result.end());
         result.resize( it - result.begin() );
     }
 
     return result;
 }
 
 void mitk::FiberBundleX::UpdateFiberGeometry()
 {
     vtkSmartPointer<vtkCleanPolyData> cleaner = vtkSmartPointer<vtkCleanPolyData>::New();
     cleaner->SetInputData(m_FiberPolyData);
     cleaner->PointMergingOff();
     cleaner->Update();
     m_FiberPolyData = cleaner->GetOutput();
 
     m_FiberLengths.clear();
     m_MeanFiberLength = 0;
     m_MedianFiberLength = 0;
     m_LengthStDev = 0;
     m_NumFibers = m_FiberPolyData->GetNumberOfCells();
 
     if (m_NumFibers<=0) // no fibers present; apply default geometry
     {
         m_MinFiberLength = 0;
         m_MaxFiberLength = 0;
         mitk::Geometry3D::Pointer geometry = mitk::Geometry3D::New();
         geometry->SetImageGeometry(false);
         float b[] = {0, 1, 0, 1, 0, 1};
         geometry->SetFloatBounds(b);
         SetGeometry(geometry);
         return;
     }
     double b[6];
     m_FiberPolyData->GetBounds(b);
 
     // calculate statistics
     for (int i=0; i<m_FiberPolyData->GetNumberOfCells(); i++)
     {
         vtkCell* cell = m_FiberPolyData->GetCell(i);
         int p = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
         float length = 0;
         for (int j=0; j<p-1; j++)
         {
             double p1[3];
             points->GetPoint(j, p1);
             double p2[3];
             points->GetPoint(j+1, p2);
 
             float dist = std::sqrt((p1[0]-p2[0])*(p1[0]-p2[0])+(p1[1]-p2[1])*(p1[1]-p2[1])+(p1[2]-p2[2])*(p1[2]-p2[2]));
             length += dist;
         }
         m_FiberLengths.push_back(length);
         m_MeanFiberLength += length;
         if (i==0)
         {
             m_MinFiberLength = length;
             m_MaxFiberLength = length;
         }
         else
         {
             if (length<m_MinFiberLength)
                 m_MinFiberLength = length;
             if (length>m_MaxFiberLength)
                 m_MaxFiberLength = length;
         }
     }
     m_MeanFiberLength /= m_NumFibers;
 
     std::vector< float > sortedLengths = m_FiberLengths;
     std::sort(sortedLengths.begin(), sortedLengths.end());
     for (int i=0; i<m_NumFibers; i++)
         m_LengthStDev += (m_MeanFiberLength-sortedLengths.at(i))*(m_MeanFiberLength-sortedLengths.at(i));
     if (m_NumFibers>1)
         m_LengthStDev /= (m_NumFibers-1);
     else
         m_LengthStDev = 0;
     m_LengthStDev = std::sqrt(m_LengthStDev);
     m_MedianFiberLength = sortedLengths.at(m_NumFibers/2);
 
     mitk::Geometry3D::Pointer geometry = mitk::Geometry3D::New();
     geometry->SetFloatBounds(b);
     this->SetGeometry(geometry);
 
     m_UpdateTime3D.Modified();
     m_UpdateTime2D.Modified();
 }
 
 std::vector<std::string> mitk::FiberBundleX::GetAvailableColorCodings()
 {
     std::vector<std::string> availableColorCodings;
     int numColors = m_FiberPolyData->GetPointData()->GetNumberOfArrays();
     for(int i=0; i<numColors; i++)
     {
         availableColorCodings.push_back(m_FiberPolyData->GetPointData()->GetArrayName(i));
     }
 
     //this controlstructure shall be implemented by the calling method
     if (availableColorCodings.empty())
         MITK_DEBUG << "no colorcodings available in fiberbundleX";
 
     return availableColorCodings;
 }
 
 
 char* mitk::FiberBundleX::GetCurrentColorCoding()
 {
     return m_CurrentColorCoding;
 }
 
 void mitk::FiberBundleX::SetColorCoding(const char* requestedColorCoding)
 {
     if (requestedColorCoding==NULL)
         return;
 
     if( strcmp (COLORCODING_ORIENTATION_BASED,requestedColorCoding) == 0 )    {
         this->m_CurrentColorCoding = (char*) COLORCODING_ORIENTATION_BASED;
 
     } else if( strcmp (COLORCODING_FA_BASED,requestedColorCoding) == 0 ) {
         this->m_CurrentColorCoding = (char*) COLORCODING_FA_BASED;
 
     } else if( strcmp (COLORCODING_CUSTOM,requestedColorCoding) == 0 ) {
         this->m_CurrentColorCoding = (char*) COLORCODING_CUSTOM;
 
     } else {
         MITK_DEBUG << "FIBERBUNDLE X: UNKNOWN COLORCODING in FIBERBUNDLEX Datastructure";
         this->m_CurrentColorCoding = (char*) COLORCODING_CUSTOM; //will cause blank colorcoding of fibers
     }
 
     m_UpdateTime3D.Modified();
     m_UpdateTime2D.Modified();
 }
 
 itk::Matrix< double, 3, 3 > mitk::FiberBundleX::TransformMatrix(itk::Matrix< double, 3, 3 > m, double rx, double ry, double rz)
 {
     rx = rx*M_PI/180;
     ry = ry*M_PI/180;
     rz = rz*M_PI/180;
 
     itk::Matrix< double, 3, 3 > rotX; rotX.SetIdentity();
     rotX[1][1] = cos(rx);
     rotX[2][2] = rotX[1][1];
     rotX[1][2] = -sin(rx);
     rotX[2][1] = -rotX[1][2];
 
     itk::Matrix< double, 3, 3 > rotY; rotY.SetIdentity();
     rotY[0][0] = cos(ry);
     rotY[2][2] = rotY[0][0];
     rotY[0][2] = sin(ry);
     rotY[2][0] = -rotY[0][2];
 
     itk::Matrix< double, 3, 3 > rotZ; rotZ.SetIdentity();
     rotZ[0][0] = cos(rz);
     rotZ[1][1] = rotZ[0][0];
     rotZ[0][1] = -sin(rz);
     rotZ[1][0] = -rotZ[0][1];
 
     itk::Matrix< double, 3, 3 > rot = rotZ*rotY*rotX;
 
     m = rot*m;
 
     return m;
 }
 
 itk::Point<float, 3> mitk::FiberBundleX::TransformPoint(vnl_vector_fixed< double, 3 > point, double rx, double ry, double rz, double tx, double ty, double tz)
 {
     rx = rx*M_PI/180;
     ry = ry*M_PI/180;
     rz = rz*M_PI/180;
 
     vnl_matrix_fixed< double, 3, 3 > rotX; rotX.set_identity();
     rotX[1][1] = cos(rx);
     rotX[2][2] = rotX[1][1];
     rotX[1][2] = -sin(rx);
     rotX[2][1] = -rotX[1][2];
 
     vnl_matrix_fixed< double, 3, 3 > rotY; rotY.set_identity();
     rotY[0][0] = cos(ry);
     rotY[2][2] = rotY[0][0];
     rotY[0][2] = sin(ry);
     rotY[2][0] = -rotY[0][2];
 
     vnl_matrix_fixed< double, 3, 3 > rotZ; rotZ.set_identity();
     rotZ[0][0] = cos(rz);
     rotZ[1][1] = rotZ[0][0];
     rotZ[0][1] = -sin(rz);
     rotZ[1][0] = -rotZ[0][1];
 
     vnl_matrix_fixed< double, 3, 3 > rot = rotZ*rotY*rotX;
 
     mitk::BaseGeometry::Pointer geom = this->GetGeometry();
     mitk::Point3D center = geom->GetCenter();
 
     point[0] -= center[0];
     point[1] -= center[1];
     point[2] -= center[2];
     point = rot*point;
     point[0] += center[0]+tx;
     point[1] += center[1]+ty;
     point[2] += center[2]+tz;
     itk::Point<float, 3> out; out[0] = point[0]; out[1] = point[1]; out[2] = point[2];
     return out;
 }
 
 void mitk::FiberBundleX::TransformFibers(double rx, double ry, double rz, double tx, double ty, double tz)
 {
     rx = rx*M_PI/180;
     ry = ry*M_PI/180;
     rz = rz*M_PI/180;
 
     vnl_matrix_fixed< double, 3, 3 > rotX; rotX.set_identity();
     rotX[1][1] = cos(rx);
     rotX[2][2] = rotX[1][1];
     rotX[1][2] = -sin(rx);
     rotX[2][1] = -rotX[1][2];
 
     vnl_matrix_fixed< double, 3, 3 > rotY; rotY.set_identity();
     rotY[0][0] = cos(ry);
     rotY[2][2] = rotY[0][0];
     rotY[0][2] = sin(ry);
     rotY[2][0] = -rotY[0][2];
 
     vnl_matrix_fixed< double, 3, 3 > rotZ; rotZ.set_identity();
     rotZ[0][0] = cos(rz);
     rotZ[1][1] = rotZ[0][0];
     rotZ[0][1] = -sin(rz);
     rotZ[1][0] = -rotZ[0][1];
 
     vnl_matrix_fixed< double, 3, 3 > rot = rotZ*rotY*rotX;
 
     mitk::BaseGeometry::Pointer geom = this->GetGeometry();
     mitk::Point3D center = geom->GetCenter();
 
     vtkSmartPointer<vtkPoints> vtkNewPoints = vtkSmartPointer<vtkPoints>::New();
     vtkSmartPointer<vtkCellArray> vtkNewCells = vtkSmartPointer<vtkCellArray>::New();
 
     for (int i=0; i<m_NumFibers; i++)
     {
         vtkCell* cell = m_FiberPolyData->GetCell(i);
         int numPoints = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
 
         vtkSmartPointer<vtkPolyLine> container = vtkSmartPointer<vtkPolyLine>::New();
         for (int j=0; j<numPoints; j++)
         {
             double* p = points->GetPoint(j);
             vnl_vector_fixed< double, 3 > dir;
             dir[0] = p[0]-center[0];
             dir[1] = p[1]-center[1];
             dir[2] = p[2]-center[2];
             dir = rot*dir;
             dir[0] += center[0]+tx;
             dir[1] += center[1]+ty;
             dir[2] += center[2]+tz;
             vtkIdType id = vtkNewPoints->InsertNextPoint(dir.data_block());
             container->GetPointIds()->InsertNextId(id);
         }
         vtkNewCells->InsertNextCell(container);
     }
 
     m_FiberPolyData = vtkSmartPointer<vtkPolyData>::New();
     m_FiberPolyData->SetPoints(vtkNewPoints);
     m_FiberPolyData->SetLines(vtkNewCells);
     UpdateColorCoding();
     UpdateFiberGeometry();
 }
 
 void mitk::FiberBundleX::RotateAroundAxis(double x, double y, double z)
 {
     x = x*M_PI/180;
     y = y*M_PI/180;
     z = z*M_PI/180;
 
     vnl_matrix_fixed< double, 3, 3 > rotX; rotX.set_identity();
     rotX[1][1] = cos(x);
     rotX[2][2] = rotX[1][1];
     rotX[1][2] = -sin(x);
     rotX[2][1] = -rotX[1][2];
 
     vnl_matrix_fixed< double, 3, 3 > rotY; rotY.set_identity();
     rotY[0][0] = cos(y);
     rotY[2][2] = rotY[0][0];
     rotY[0][2] = sin(y);
     rotY[2][0] = -rotY[0][2];
 
     vnl_matrix_fixed< double, 3, 3 > rotZ; rotZ.set_identity();
     rotZ[0][0] = cos(z);
     rotZ[1][1] = rotZ[0][0];
     rotZ[0][1] = -sin(z);
     rotZ[1][0] = -rotZ[0][1];
 
     mitk::BaseGeometry::Pointer geom = this->GetGeometry();
     mitk::Point3D center = geom->GetCenter();
 
     vtkSmartPointer<vtkPoints> vtkNewPoints = vtkSmartPointer<vtkPoints>::New();
     vtkSmartPointer<vtkCellArray> vtkNewCells = vtkSmartPointer<vtkCellArray>::New();
 
     for (int i=0; i<m_NumFibers; i++)
     {
         vtkCell* cell = m_FiberPolyData->GetCell(i);
         int numPoints = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
 
         vtkSmartPointer<vtkPolyLine> container = vtkSmartPointer<vtkPolyLine>::New();
         for (int j=0; j<numPoints; j++)
         {
             double* p = points->GetPoint(j);
             vnl_vector_fixed< double, 3 > dir;
             dir[0] = p[0]-center[0];
             dir[1] = p[1]-center[1];
             dir[2] = p[2]-center[2];
             dir = rotZ*rotY*rotX*dir;
             dir[0] += center[0];
             dir[1] += center[1];
             dir[2] += center[2];
             vtkIdType id = vtkNewPoints->InsertNextPoint(dir.data_block());
             container->GetPointIds()->InsertNextId(id);
         }
         vtkNewCells->InsertNextCell(container);
     }
 
     m_FiberPolyData = vtkSmartPointer<vtkPolyData>::New();
     m_FiberPolyData->SetPoints(vtkNewPoints);
     m_FiberPolyData->SetLines(vtkNewCells);
     UpdateColorCoding();
     UpdateFiberGeometry();
 }
 
 void mitk::FiberBundleX::ScaleFibers(double x, double y, double z)
 {
     MITK_INFO << "Scaling fibers";
     boost::progress_display disp(m_NumFibers);
 
     mitk::BaseGeometry* geom = this->GetGeometry();
     mitk::Point3D c = geom->GetCenter();
 
     vtkSmartPointer<vtkPoints> vtkNewPoints = vtkSmartPointer<vtkPoints>::New();
     vtkSmartPointer<vtkCellArray> vtkNewCells = vtkSmartPointer<vtkCellArray>::New();
 
     for (int i=0; i<m_NumFibers; i++)
     {
         ++disp ;
         vtkCell* cell = m_FiberPolyData->GetCell(i);
         int numPoints = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
 
         vtkSmartPointer<vtkPolyLine> container = vtkSmartPointer<vtkPolyLine>::New();
         for (int j=0; j<numPoints; j++)
         {
             double* p = points->GetPoint(j);
             p[0] -= c[0]; p[1] -= c[1]; p[2] -= c[2];
             p[0] *= x;
             p[1] *= y;
             p[2] *= z;
             p[0] += c[0]; p[1] += c[1]; p[2] += c[2];
             vtkIdType id = vtkNewPoints->InsertNextPoint(p);
             container->GetPointIds()->InsertNextId(id);
         }
         vtkNewCells->InsertNextCell(container);
     }
 
     m_FiberPolyData = vtkSmartPointer<vtkPolyData>::New();
     m_FiberPolyData->SetPoints(vtkNewPoints);
     m_FiberPolyData->SetLines(vtkNewCells);
     UpdateColorCoding();
     UpdateFiberGeometry();
 }
 
 void mitk::FiberBundleX::TranslateFibers(double x, double y, double z)
 {
     vtkSmartPointer<vtkPoints> vtkNewPoints = vtkSmartPointer<vtkPoints>::New();
     vtkSmartPointer<vtkCellArray> vtkNewCells = vtkSmartPointer<vtkCellArray>::New();
 
     for (int i=0; i<m_NumFibers; i++)
     {
         vtkCell* cell = m_FiberPolyData->GetCell(i);
         int numPoints = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
 
         vtkSmartPointer<vtkPolyLine> container = vtkSmartPointer<vtkPolyLine>::New();
         for (int j=0; j<numPoints; j++)
         {
             double* p = points->GetPoint(j);
             p[0] += x;
             p[1] += y;
             p[2] += z;
             vtkIdType id = vtkNewPoints->InsertNextPoint(p);
             container->GetPointIds()->InsertNextId(id);
         }
         vtkNewCells->InsertNextCell(container);
     }
 
     m_FiberPolyData = vtkSmartPointer<vtkPolyData>::New();
     m_FiberPolyData->SetPoints(vtkNewPoints);
     m_FiberPolyData->SetLines(vtkNewCells);
     UpdateColorCoding();
     UpdateFiberGeometry();
 }
 
 void mitk::FiberBundleX::MirrorFibers(unsigned int axis)
 {
     if (axis>2)
         return;
 
     MITK_INFO << "Mirroring fibers";
     boost::progress_display disp(m_NumFibers);
 
     vtkSmartPointer<vtkPoints> vtkNewPoints = vtkSmartPointer<vtkPoints>::New();
     vtkSmartPointer<vtkCellArray> vtkNewCells = vtkSmartPointer<vtkCellArray>::New();
 
     for (int i=0; i<m_NumFibers; i++)
     {
         ++disp;
         vtkCell* cell = m_FiberPolyData->GetCell(i);
         int numPoints = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
 
         vtkSmartPointer<vtkPolyLine> container = vtkSmartPointer<vtkPolyLine>::New();
         for (int j=0; j<numPoints; j++)
         {
             double* p = points->GetPoint(j);
             p[axis] = -p[axis];
             vtkIdType id = vtkNewPoints->InsertNextPoint(p);
             container->GetPointIds()->InsertNextId(id);
         }
         vtkNewCells->InsertNextCell(container);
     }
 
     m_FiberPolyData = vtkSmartPointer<vtkPolyData>::New();
     m_FiberPolyData->SetPoints(vtkNewPoints);
     m_FiberPolyData->SetLines(vtkNewCells);
     UpdateColorCoding();
     UpdateFiberGeometry();
 }
 
 bool mitk::FiberBundleX::ApplyCurvatureThreshold(float minRadius, bool deleteFibers)
 {
     if (minRadius<0)
         return true;
 
     vtkSmartPointer<vtkPoints> vtkNewPoints = vtkSmartPointer<vtkPoints>::New();
     vtkSmartPointer<vtkCellArray> vtkNewCells = vtkSmartPointer<vtkCellArray>::New();
 
     MITK_INFO << "Applying curvature threshold";
     boost::progress_display disp(m_FiberPolyData->GetNumberOfCells());
     for (int i=0; i<m_FiberPolyData->GetNumberOfCells(); i++)
     {
         ++disp ;
         vtkCell* cell = m_FiberPolyData->GetCell(i);
         int numPoints = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
 
         // calculate curvatures
         vtkSmartPointer<vtkPolyLine> container = vtkSmartPointer<vtkPolyLine>::New();
         for (int j=0; j<numPoints-2; j++)
         {
             double p1[3];
             points->GetPoint(j, p1);
             double p2[3];
             points->GetPoint(j+1, p2);
             double p3[3];
             points->GetPoint(j+2, p3);
 
             vnl_vector_fixed< float, 3 > v1, v2, v3;
 
             v1[0] = p2[0]-p1[0];
             v1[1] = p2[1]-p1[1];
             v1[2] = p2[2]-p1[2];
 
             v2[0] = p3[0]-p2[0];
             v2[1] = p3[1]-p2[1];
             v2[2] = p3[2]-p2[2];
 
             v3[0] = p1[0]-p3[0];
             v3[1] = p1[1]-p3[1];
             v3[2] = p1[2]-p3[2];
 
             float a = v1.magnitude();
             float b = v2.magnitude();
             float c = v3.magnitude();
             float r = a*b*c/std::sqrt((a+b+c)*(a+b-c)*(b+c-a)*(a-b+c)); // radius of triangle via Heron's formula (area of triangle)
 
             vtkIdType id = vtkNewPoints->InsertNextPoint(p1);
             container->GetPointIds()->InsertNextId(id);
 
             if (deleteFibers && r<minRadius)
                 break;
 
             if (r<minRadius)
             {
                 j += 2;
                 vtkNewCells->InsertNextCell(container);
                 container = vtkSmartPointer<vtkPolyLine>::New();
             }
             else if (j==numPoints-3)
             {
                 id = vtkNewPoints->InsertNextPoint(p2);
                 container->GetPointIds()->InsertNextId(id);
                 id = vtkNewPoints->InsertNextPoint(p3);
                 container->GetPointIds()->InsertNextId(id);
                 vtkNewCells->InsertNextCell(container);
             }
         }
     }
 
     if (vtkNewCells->GetNumberOfCells()<=0)
         return false;
 
     m_FiberPolyData = vtkSmartPointer<vtkPolyData>::New();
     m_FiberPolyData->SetPoints(vtkNewPoints);
     m_FiberPolyData->SetLines(vtkNewCells);
 
     UpdateColorCoding();
     UpdateFiberGeometry();
     return true;
 }
 
 bool mitk::FiberBundleX::RemoveShortFibers(float lengthInMM)
 {
     MITK_INFO << "Removing short fibers";
     if (lengthInMM<=0 || lengthInMM<m_MinFiberLength)
     {
         MITK_INFO << "No fibers shorter than " << lengthInMM << " mm found!";
         return true;
     }
 
     if (lengthInMM>m_MaxFiberLength)    // can't remove all fibers
     {
         MITK_WARN << "Process aborted. No fibers would be left!";
         return false;
     }
 
     vtkSmartPointer<vtkPoints> vtkNewPoints = vtkSmartPointer<vtkPoints>::New();
     vtkSmartPointer<vtkCellArray> vtkNewCells = vtkSmartPointer<vtkCellArray>::New();
     float min = m_MaxFiberLength;
 
     boost::progress_display disp(m_NumFibers);
     for (int i=0; i<m_NumFibers; i++)
     {
         ++disp;
         vtkCell* cell = m_FiberPolyData->GetCell(i);
         int numPoints = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
 
         if (m_FiberLengths.at(i)>=lengthInMM)
         {
             vtkSmartPointer<vtkPolyLine> container = vtkSmartPointer<vtkPolyLine>::New();
             for (int j=0; j<numPoints; j++)
             {
                 double* p = points->GetPoint(j);
                 vtkIdType id = vtkNewPoints->InsertNextPoint(p);
                 container->GetPointIds()->InsertNextId(id);
             }
             vtkNewCells->InsertNextCell(container);
             if (m_FiberLengths.at(i)<min)
                 min = m_FiberLengths.at(i);
         }
     }
 
     if (vtkNewCells->GetNumberOfCells()<=0)
         return false;
 
     m_FiberPolyData = vtkSmartPointer<vtkPolyData>::New();
     m_FiberPolyData->SetPoints(vtkNewPoints);
     m_FiberPolyData->SetLines(vtkNewCells);
 
     UpdateColorCoding();
     UpdateFiberGeometry();
     return true;
 }
 
 bool mitk::FiberBundleX::RemoveLongFibers(float lengthInMM)
 {
     if (lengthInMM<=0 || lengthInMM>m_MaxFiberLength)
         return true;
 
     if (lengthInMM<m_MinFiberLength)    // can't remove all fibers
         return false;
 
     vtkSmartPointer<vtkPoints> vtkNewPoints = vtkSmartPointer<vtkPoints>::New();
     vtkSmartPointer<vtkCellArray> vtkNewCells = vtkSmartPointer<vtkCellArray>::New();
 
     MITK_INFO << "Removing long fibers";
     boost::progress_display disp(m_NumFibers);
     for (int i=0; i<m_NumFibers; i++)
     {
         ++disp;
         vtkCell* cell = m_FiberPolyData->GetCell(i);
         int numPoints = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
 
         if (m_FiberLengths.at(i)<=lengthInMM)
         {
             vtkSmartPointer<vtkPolyLine> container = vtkSmartPointer<vtkPolyLine>::New();
             for (int j=0; j<numPoints; j++)
             {
                 double* p = points->GetPoint(j);
                 vtkIdType id = vtkNewPoints->InsertNextPoint(p);
                 container->GetPointIds()->InsertNextId(id);
             }
             vtkNewCells->InsertNextCell(container);
         }
     }
 
     if (vtkNewCells->GetNumberOfCells()<=0)
         return false;
 
     m_FiberPolyData = vtkSmartPointer<vtkPolyData>::New();
     m_FiberPolyData->SetPoints(vtkNewPoints);
     m_FiberPolyData->SetLines(vtkNewCells);
     UpdateColorCoding();
     UpdateFiberGeometry();
     return true;
 }
 
 void mitk::FiberBundleX::DoFiberSmoothing(float pointDistance, double tension, double continuity, double bias )
 {
     if (pointDistance<=0)
         return;
 
     vtkSmartPointer<vtkPoints> vtkSmoothPoints = vtkSmartPointer<vtkPoints>::New(); //in smoothpoints the interpolated points representing a fiber are stored.
 
     //in vtkcells all polylines are stored, actually all id's of them are stored
     vtkSmartPointer<vtkCellArray> vtkSmoothCells = vtkSmartPointer<vtkCellArray>::New(); //cellcontainer for smoothed lines
     vtkIdType pointHelperCnt = 0;
 
     MITK_INFO << "Smoothing fibers";
     boost::progress_display disp(m_NumFibers);
     for (int i=0; i<m_NumFibers; i++)
     {
         ++disp;
         vtkCell* cell = m_FiberPolyData->GetCell(i);
         int numPoints = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
 
         vtkSmartPointer<vtkPoints> newPoints = vtkSmartPointer<vtkPoints>::New();
         for (int j=0; j<numPoints; j++)
             newPoints->InsertNextPoint(points->GetPoint(j));
 
         float length = m_FiberLengths.at(i);
         int sampling = std::ceil(length/pointDistance);
 
         vtkSmartPointer<vtkKochanekSpline> xSpline = vtkSmartPointer<vtkKochanekSpline>::New();
         vtkSmartPointer<vtkKochanekSpline> ySpline = vtkSmartPointer<vtkKochanekSpline>::New();
         vtkSmartPointer<vtkKochanekSpline> zSpline = vtkSmartPointer<vtkKochanekSpline>::New();
         xSpline->SetDefaultBias(bias); xSpline->SetDefaultTension(tension); xSpline->SetDefaultContinuity(continuity);
         ySpline->SetDefaultBias(bias); ySpline->SetDefaultTension(tension); ySpline->SetDefaultContinuity(continuity);
         zSpline->SetDefaultBias(bias); zSpline->SetDefaultTension(tension); zSpline->SetDefaultContinuity(continuity);
 
         vtkSmartPointer<vtkParametricSpline> spline = vtkSmartPointer<vtkParametricSpline>::New();
         spline->SetXSpline(xSpline);
         spline->SetYSpline(ySpline);
         spline->SetZSpline(zSpline);
         spline->SetPoints(newPoints);
 
         vtkSmartPointer<vtkParametricFunctionSource> functionSource = vtkSmartPointer<vtkParametricFunctionSource>::New();
         functionSource->SetParametricFunction(spline);
         functionSource->SetUResolution(sampling);
         functionSource->SetVResolution(sampling);
         functionSource->SetWResolution(sampling);
         functionSource->Update();
 
         vtkPolyData* outputFunction = functionSource->GetOutput();
         vtkPoints* tmpSmoothPnts = outputFunction->GetPoints(); //smoothPoints of current fiber
 
         vtkSmartPointer<vtkPolyLine> smoothLine = vtkSmartPointer<vtkPolyLine>::New();
         smoothLine->GetPointIds()->SetNumberOfIds(tmpSmoothPnts->GetNumberOfPoints());
 
         for (int j=0; j<smoothLine->GetNumberOfPoints(); j++)
         {
             smoothLine->GetPointIds()->SetId(j, j+pointHelperCnt);
             vtkSmoothPoints->InsertNextPoint(tmpSmoothPnts->GetPoint(j));
         }
         vtkSmoothCells->InsertNextCell(smoothLine);
         pointHelperCnt += tmpSmoothPnts->GetNumberOfPoints();
     }
 
     m_FiberPolyData = vtkSmartPointer<vtkPolyData>::New();
     m_FiberPolyData->SetPoints(vtkSmoothPoints);
     m_FiberPolyData->SetLines(vtkSmoothCells);
     UpdateColorCoding();
     UpdateFiberGeometry();
     m_FiberSampling = 10/pointDistance;
 }
 
 void mitk::FiberBundleX::DoFiberSmoothing(float pointDistance)
 {
     DoFiberSmoothing(pointDistance, 0, 0, 0 );
 }
 
 unsigned long mitk::FiberBundleX::GetNumberOfPoints()
 {
     unsigned long points = 0;
     for (int i=0; i<m_FiberPolyData->GetNumberOfCells(); i++)
     {
         vtkCell* cell = m_FiberPolyData->GetCell(i);
         points += cell->GetNumberOfPoints();
     }
     return points;
 }
 
 void mitk::FiberBundleX::CompressFibers(float error)
 {
     vtkSmartPointer<vtkPoints> vtkNewPoints = vtkSmartPointer<vtkPoints>::New();
     vtkSmartPointer<vtkCellArray> vtkNewCells = vtkSmartPointer<vtkCellArray>::New();
 
     MITK_INFO << "Compressing fibers";
     unsigned long numRemovedPoints = 0;
     boost::progress_display disp(m_FiberPolyData->GetNumberOfCells());
 
     for (int i=0; i<m_FiberPolyData->GetNumberOfCells(); i++)
     {
         ++disp;
         vtkCell* cell = m_FiberPolyData->GetCell(i);
         int numPoints = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
 
         // calculate curvatures
         std::vector< int > removedPoints; removedPoints.resize(numPoints, 0);
         removedPoints[0]=-1; removedPoints[numPoints-1]=-1;
 
         vtkSmartPointer<vtkPolyLine> container = vtkSmartPointer<vtkPolyLine>::New();
 
         bool pointFound = true;
         while (pointFound)
         {
             pointFound = false;
             double minError = error;
             int removeIndex = -1;
 
             for (int j=0; j<numPoints; j++)
             {
                 if (removedPoints[j]==0)
                 {
                     double cand[3];
                     points->GetPoint(j, cand);
                     vnl_vector_fixed< double, 3 > candV;
                     candV[0]=cand[0]; candV[1]=cand[1]; candV[2]=cand[2];
 
                     int validP = -1;
                     vnl_vector_fixed< double, 3 > pred;
                     for (int k=j-1; k>=0; k--)
                         if (removedPoints[k]<=0)
                         {
                             double ref[3];
                             points->GetPoint(k, ref);
                             pred[0]=ref[0]; pred[1]=ref[1]; pred[2]=ref[2];
                             validP = k;
                             break;
                         }
                     int validS = -1;
                     vnl_vector_fixed< double, 3 > succ;
                     for (int k=j+1; k<numPoints; k++)
                         if (removedPoints[k]<=0)
                         {
                             double ref[3];
                             points->GetPoint(k, ref);
                             succ[0]=ref[0]; succ[1]=ref[1]; succ[2]=ref[2];
                             validS = k;
                             break;
                         }
 
                     if (validP>=0 && validS>=0)
                     {
                         double a = (candV-pred).magnitude();
                         double b = (candV-succ).magnitude();
                         double c = (pred-succ).magnitude();
                         double s=0.5*(a+b+c);
                         double hc=(2.0/c)*sqrt(fabs(s*(s-a)*(s-b)*(s-c)));
 
                         if (hc<minError)
                         {
                             removeIndex = j;
                             minError = hc;
                             pointFound = true;
                         }
                     }
                 }
             }
 
             if (pointFound)
             {
                 removedPoints[removeIndex] = 1;
                 numRemovedPoints++;
             }
         }
 
         for (int j=0; j<numPoints; j++)
         {
             if (removedPoints[j]<=0)
             {
                 double cand[3];
                 points->GetPoint(j, cand);
                 vtkIdType id = vtkNewPoints->InsertNextPoint(cand);
                 container->GetPointIds()->InsertNextId(id);
             }
         }
 
         vtkNewCells->InsertNextCell(container);
     }
 
     if (vtkNewCells->GetNumberOfCells()>0)
     {
         MITK_INFO << "Removed points: " << numRemovedPoints;
         m_FiberPolyData = vtkSmartPointer<vtkPolyData>::New();
         m_FiberPolyData->SetPoints(vtkNewPoints);
         m_FiberPolyData->SetLines(vtkNewCells);
 
         UpdateColorCoding();
         UpdateFiberGeometry();
     }
 }
 
 // Resample fiber to get equidistant points
 void mitk::FiberBundleX::ResampleFibers(float pointDistance)
 {
     if (pointDistance<=0.00001)
         return;
 
     vtkSmartPointer<vtkPolyData> newPoly = vtkSmartPointer<vtkPolyData>::New();
     vtkSmartPointer<vtkCellArray> newCellArray = vtkSmartPointer<vtkCellArray>::New();
     vtkSmartPointer<vtkPoints>    newPoints = vtkSmartPointer<vtkPoints>::New();
 
     int numberOfLines = m_NumFibers;
 
     MITK_INFO << "Resampling fibers";
     boost::progress_display disp(m_NumFibers);
     for (int i=0; i<numberOfLines; i++)
     {
         ++disp;
         vtkCell* cell = m_FiberPolyData->GetCell(i);
         int numPoints = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
 
         vtkSmartPointer<vtkPolyLine> container = vtkSmartPointer<vtkPolyLine>::New();
 
         double* point = points->GetPoint(0);
         vtkIdType pointId = newPoints->InsertNextPoint(point);
         container->GetPointIds()->InsertNextId(pointId);
 
         float dtau = 0;
         int cur_p = 1;
         itk::Vector<float,3> dR;
         float normdR = 0;
 
         for (;;)
         {
             while (dtau <= pointDistance && cur_p < numPoints)
             {
                 itk::Vector<float,3> v1;
                 point = points->GetPoint(cur_p-1);
                 v1[0] = point[0];
                 v1[1] = point[1];
                 v1[2] = point[2];
                 itk::Vector<float,3> v2;
                 point = points->GetPoint(cur_p);
                 v2[0] = point[0];
                 v2[1] = point[1];
                 v2[2] = point[2];
 
                 dR  = v2 - v1;
                 normdR = std::sqrt(dR.GetSquaredNorm());
                 dtau += normdR;
                 cur_p++;
             }
 
             if (dtau >= pointDistance)
             {
                 itk::Vector<float,3> v1;
                 point = points->GetPoint(cur_p-1);
                 v1[0] = point[0];
                 v1[1] = point[1];
                 v1[2] = point[2];
 
                 itk::Vector<float,3> v2 = v1 - dR*( (dtau-pointDistance)/normdR );
                 pointId = newPoints->InsertNextPoint(v2.GetDataPointer());
                 container->GetPointIds()->InsertNextId(pointId);
             }
             else
             {
                 point = points->GetPoint(numPoints-1);
                 pointId = newPoints->InsertNextPoint(point);
                 container->GetPointIds()->InsertNextId(pointId);
                 break;
             }
             dtau = dtau-pointDistance;
         }
 
         newCellArray->InsertNextCell(container);
     }
 
     newPoly->SetPoints(newPoints);
     newPoly->SetLines(newCellArray);
     m_FiberPolyData = newPoly;
     UpdateFiberGeometry();
     UpdateColorCoding();
     m_FiberSampling = 10/pointDistance;
 }
 
 // reapply selected colorcoding in case polydata structure has changed
 void mitk::FiberBundleX::UpdateColorCoding()
 {
     char* cc = GetCurrentColorCoding();
 
     if( strcmp (COLORCODING_ORIENTATION_BASED,cc) == 0 )
         DoColorCodingOrientationBased();
     else if( strcmp (COLORCODING_FA_BASED,cc) == 0 )
         DoColorCodingFaBased();
 }
 
 // reapply selected colorcoding in case polydata structure has changed
 bool mitk::FiberBundleX::Equals(mitk::FiberBundleX* fib, double eps)
 {
     if (fib==NULL)
     {
         MITK_INFO << "Reference bundle is NULL!";
         return false;
     }
 
     if (m_NumFibers!=fib->GetNumFibers())
     {
         MITK_INFO << "Unequal number of fibers!";
         MITK_INFO << m_NumFibers << " vs. " << fib->GetNumFibers();
         return false;
     }
 
     for (int i=0; i<m_NumFibers; i++)
     {
         vtkCell* cell = m_FiberPolyData->GetCell(i);
         int numPoints = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
 
         vtkCell* cell2 = fib->GetFiberPolyData()->GetCell(i);
         int numPoints2 = cell2->GetNumberOfPoints();
         vtkPoints* points2 = cell2->GetPoints();
 
         if (numPoints2!=numPoints)
         {
             MITK_INFO << "Unequal number of points in fiber " << i << "!";
             MITK_INFO << numPoints2 << " vs. " << numPoints;
             return false;
         }
 
         for (int j=0; j<numPoints; j++)
         {
             double* p1 = points->GetPoint(j);
             double* p2 = points2->GetPoint(j);
             if (fabs(p1[0]-p2[0])>eps || fabs(p1[1]-p2[1])>eps || fabs(p1[2]-p2[2])>eps)
             {
                 MITK_INFO << "Unequal points in fiber " << i << " at position " << j << "!";
                 MITK_INFO << "p1: " << p1[0] << ", " << p1[1] << ", " << p1[2];
                 MITK_INFO << "p2: " << p2[0] << ", " << p2[1] << ", " << p2[2];
                 return false;
             }
         }
     }
 
     return true;
 }
 
 /* ESSENTIAL IMPLEMENTATION OF SUPERCLASS METHODS */
 void mitk::FiberBundleX::UpdateOutputInformation()
 {
 
 }
 void mitk::FiberBundleX::SetRequestedRegionToLargestPossibleRegion()
 {
 
 }
 bool mitk::FiberBundleX::RequestedRegionIsOutsideOfTheBufferedRegion()
 {
     return false;
 }
 bool mitk::FiberBundleX::VerifyRequestedRegion()
 {
     return true;
 }
 void mitk::FiberBundleX::SetRequestedRegion(const itk::DataObject* )
 {
 
 }
diff --git a/Modules/DiffusionImaging/FiberTracking/IODataStructures/FiberBundleX/mitkFiberBundleX.h b/Modules/DiffusionImaging/FiberTracking/IODataStructures/FiberBundleX/mitkFiberBundleX.h
index 857e98adf5..2978be04dd 100644
--- a/Modules/DiffusionImaging/FiberTracking/IODataStructures/FiberBundleX/mitkFiberBundleX.h
+++ b/Modules/DiffusionImaging/FiberTracking/IODataStructures/FiberBundleX/mitkFiberBundleX.h
@@ -1,172 +1,173 @@
 /*===================================================================
 
 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.
 
 ===================================================================*/
 
 
 #ifndef _MITK_FiberBundleX_H
 #define _MITK_FiberBundleX_H
 
 //includes for MITK datastructure
 #include <mitkBaseData.h>
 #include <MitkFiberTrackingExports.h>
 #include <mitkImage.h>
 
 
 //includes storing fiberdata
 #include <vtkSmartPointer.h>
 #include <vtkPolyData.h>
 #include <vtkPoints.h>
 #include <vtkDataSet.h>
 #include <vtkTransform.h>
 
 //#include <QStringList>
 
 #include <mitkPlanarFigure.h>
 #include <mitkPixelTypeTraits.h>
 #include <mitkPlanarFigureComposite.h>
 
 namespace mitk {
 
 /**
    * \brief Base Class for Fiber Bundles;   */
 class MitkFiberTracking_EXPORT FiberBundleX : public BaseData
 {
 public:
 
     typedef itk::Image<unsigned char, 3> ItkUcharImgType;
 
     // fiber colorcodings
     static const char* COLORCODING_ORIENTATION_BASED;
     static const char* COLORCODING_FA_BASED;
     static const char* COLORCODING_CUSTOM;
     static const char* FIBER_ID_ARRAY;
 
     virtual void UpdateOutputInformation();
     virtual void SetRequestedRegionToLargestPossibleRegion();
     virtual bool RequestedRegionIsOutsideOfTheBufferedRegion();
     virtual bool VerifyRequestedRegion();
     virtual void SetRequestedRegion(const itk::DataObject*);
 
     mitkClassMacro( FiberBundleX, BaseData )
     itkFactorylessNewMacro(Self)
     itkCloneMacro(Self)
     mitkNewMacro1Param(Self, vtkSmartPointer<vtkPolyData>) // custom constructor
 
     // colorcoding related methods
     void SetColorCoding(const char*);
     void SetFAMap(mitk::Image::Pointer);
     template <typename TPixel>
     void SetFAMap(const mitk::PixelType pixelType, mitk::Image::Pointer);
     void DoColorCodingOrientationBased();
     void DoColorCodingFaBased();
     void DoUseFaFiberOpacity();
     void ResetFiberOpacity();
 
     // fiber smoothing/resampling
     void CompressFibers(float error = 0.0);
     void ResampleFibers(float pointDistance = 1);
     void DoFiberSmoothing(float pointDistance);
     void DoFiberSmoothing(float pointDistance, double tension, double continuity, double bias );
     bool RemoveShortFibers(float lengthInMM);
     bool RemoveLongFibers(float lengthInMM);
     bool ApplyCurvatureThreshold(float minRadius, bool deleteFibers);
     void MirrorFibers(unsigned int axis);
     void RotateAroundAxis(double x, double y, double z);
     void TranslateFibers(double x, double y, double z);
     void ScaleFibers(double x, double y, double z);
     void TransformFibers(double rx, double ry, double rz, double tx, double ty, double tz);
     itk::Point<float, 3> TransformPoint(vnl_vector_fixed< double, 3 > point, double rx, double ry, double rz, double tx, double ty, double tz);
     itk::Matrix< double, 3, 3 > TransformMatrix(itk::Matrix< double, 3, 3 > m, double rx, double ry, double rz);
 
     // add/subtract fibers
     FiberBundleX::Pointer AddBundle(FiberBundleX* fib);
     FiberBundleX::Pointer SubtractBundle(FiberBundleX* fib);
 
     // fiber subset extraction
     FiberBundleX::Pointer           ExtractFiberSubset(BaseData* roi);
     std::vector<long>               ExtractFiberIdSubset(BaseData* roi);
     FiberBundleX::Pointer           ExtractFiberSubset(ItkUcharImgType* mask, bool anyPoint, bool invert=false);
     FiberBundleX::Pointer           RemoveFibersOutside(ItkUcharImgType* mask, bool invert=false);
 
     vtkSmartPointer<vtkPolyData>    GeneratePolyDataByIds( std::vector<long> ); // TODO: make protected
     void                            GenerateFiberIds(); // TODO: make protected
 
     // get/set data
     void SetFiberPolyData(vtkSmartPointer<vtkPolyData>, bool updateGeometry = true);
-    vtkSmartPointer<vtkPolyData> GetFiberPolyData();
+    vtkSmartPointer<vtkPolyData> GetFiberPolyData() const;
     std::vector< std::string > GetAvailableColorCodings();
     char* GetCurrentColorCoding();
     itkGetMacro( NumFibers, int)
-    itkGetMacro( FiberSampling, int)
+    //itkGetMacro( FiberSampling, int)
+    int GetNumFibers() const {return m_NumFibers;}
     itkGetMacro( MinFiberLength, float )
     itkGetMacro( MaxFiberLength, float )
     itkGetMacro( MeanFiberLength, float )
     itkGetMacro( MedianFiberLength, float )
     itkGetMacro( LengthStDev, float )
     itkGetMacro( UpdateTime2D, itk::TimeStamp )
     itkGetMacro( UpdateTime3D, itk::TimeStamp )
     void RequestUpdate2D(){ m_UpdateTime2D.Modified(); }
     void RequestUpdate3D(){ m_UpdateTime3D.Modified(); }
 
     unsigned long GetNumberOfPoints();
 
     // copy fiber bundle
     mitk::FiberBundleX::Pointer GetDeepCopy();
 
     // compare fiber bundles
     bool Equals(FiberBundleX* fib, double eps=0.0001);
 
     itkSetMacro( ReferenceGeometry, mitk::BaseGeometry::Pointer )
-    itkGetMacro( ReferenceGeometry, mitk::BaseGeometry::Pointer )
+    itkGetConstMacro( ReferenceGeometry, mitk::BaseGeometry::Pointer )
 
 protected:
 
     FiberBundleX( vtkPolyData* fiberPolyData = NULL );
     virtual ~FiberBundleX();
 
     itk::Point<float, 3> GetItkPoint(double point[3]);
 
     // calculate geometry from fiber extent
     void UpdateFiberGeometry();
 
     // calculate colorcoding values according to m_CurrentColorCoding
     void UpdateColorCoding();
 
 private:
 
     // actual fiber container
     vtkSmartPointer<vtkPolyData>  m_FiberPolyData;
 
     // contains fiber ids
     vtkSmartPointer<vtkDataSet>   m_FiberIdDataSet;
 
     char* m_CurrentColorCoding;
     int   m_NumFibers;
 
     std::vector< float > m_FiberLengths;
     float   m_MinFiberLength;
     float   m_MaxFiberLength;
     float   m_MeanFiberLength;
     float   m_MedianFiberLength;
     float   m_LengthStDev;
     int     m_FiberSampling;
     itk::TimeStamp m_UpdateTime2D;
     itk::TimeStamp m_UpdateTime3D;
     mitk::BaseGeometry::Pointer m_ReferenceGeometry;
 };
 
 } // namespace mitk
 
 #endif /*  _MITK_FiberBundleX_H */
diff --git a/Modules/DiffusionImaging/FiberTracking/IODataStructures/FiberBundleX/mitkTrackvis.cpp b/Modules/DiffusionImaging/FiberTracking/IODataStructures/FiberBundleX/mitkTrackvis.cpp
index e34d192642..e63fdb8603 100644
--- a/Modules/DiffusionImaging/FiberTracking/IODataStructures/FiberBundleX/mitkTrackvis.cpp
+++ b/Modules/DiffusionImaging/FiberTracking/IODataStructures/FiberBundleX/mitkTrackvis.cpp
@@ -1,237 +1,237 @@
 #include <mitkTrackvis.h>
 #include <vtkTransformPolyDataFilter.h>
 
 TrackVisFiberReader::TrackVisFiberReader()  { m_Filename = ""; m_FilePointer = NULL; }
 
 TrackVisFiberReader::~TrackVisFiberReader() { if (m_FilePointer) fclose( m_FilePointer ); }
 
 
 // Create a TrackVis file and store standard metadata. The file is ready to append fibers.
 // ---------------------------------------------------------------------------------------
-short TrackVisFiberReader::create(string filename , mitk::FiberBundleX *fib)
+short TrackVisFiberReader::create(string filename , const mitk::FiberBundleX *fib)
 {
     // prepare the header
     for(int i=0; i<3 ;i++)
     {
         if (fib->GetReferenceGeometry().IsNotNull())
         {
             m_Header.dim[i]            = fib->GetReferenceGeometry()->GetExtent(i);
             m_Header.voxel_size[i]     = fib->GetReferenceGeometry()->GetSpacing()[i];
             m_Header.origin[i]         = fib->GetReferenceGeometry()->GetOrigin()[i];
         }
         else
         {
             m_Header.dim[i]            = fib->GetGeometry()->GetExtent(i);
             m_Header.voxel_size[i]     = fib->GetGeometry()->GetSpacing()[i];
             m_Header.origin[i]         = fib->GetGeometry()->GetOrigin()[i];
         }
     }
     m_Header.n_scalars = 0;
     m_Header.n_properties = 0;
     sprintf(m_Header.voxel_order,"LPS");
     m_Header.image_orientation_patient[0] = 1.0;
     m_Header.image_orientation_patient[1] = 0.0;
     m_Header.image_orientation_patient[2] = 0.0;
     m_Header.image_orientation_patient[3] = 0.0;
     m_Header.image_orientation_patient[4] = 1.0;
     m_Header.image_orientation_patient[5] = 0.0;
     m_Header.pad1[0] = 0;
     m_Header.pad1[1] = 0;
     m_Header.pad2[0] = 0;
     m_Header.pad2[1] = 0;
     m_Header.invert_x = 0;
     m_Header.invert_y = 0;
     m_Header.invert_z = 0;
     m_Header.swap_xy = 0;
     m_Header.swap_yz = 0;
     m_Header.swap_zx = 0;
     m_Header.n_count = 0;
     m_Header.version = 1;
     m_Header.hdr_size = 1000;
 
     // write the header to the file
     m_FilePointer = fopen(filename.c_str(),"w+b");
     if (m_FilePointer == NULL)
     {
         printf("[ERROR] Unable to create file '%s'\n",filename.c_str());
         return 0;
     }
     sprintf(m_Header.id_string,"TRACK");
     if (fwrite((char*)&m_Header, 1, 1000, m_FilePointer) != 1000)
         MITK_ERROR << "TrackVis::create : Error occurding during writing fiber.";
 
     this->m_Filename = filename;
 
     return 1;
 }
 
 
 // Open an existing TrackVis file and read metadata information.
 // The file pointer is positiond at the beginning of fibers data
 // -------------------------------------------------------------
 short TrackVisFiberReader::open( string filename )
 {
     m_FilePointer = fopen(filename.c_str(),"r+b");
     if (m_FilePointer == NULL)
     {
         printf("[ERROR] Unable to open file '%s'\n",filename.c_str());
         return 0;
     }
     this->m_Filename = filename;
 
     return fread((char*)(&m_Header), 1, 1000, m_FilePointer);
 }
 
 
 
 // Append a fiber to the file
 // --------------------------
-short TrackVisFiberReader::append(mitk::FiberBundleX *fib)
+short TrackVisFiberReader::append(const mitk::FiberBundleX *fib)
 {
     vtkPolyData* poly = fib->GetFiberPolyData();
     for (int i=0; i<fib->GetNumFibers(); i++)
     {
         vtkCell* cell = poly->GetCell(i);
         int numPoints = cell->GetNumberOfPoints();
         vtkPoints* points = cell->GetPoints();
 
         unsigned int     numSaved, pos = 0;
         //float* tmp = new float[3*maxSteps];
         std::vector< float > tmp;
         tmp.reserve(3*numPoints);
 
         numSaved = numPoints;
         for(unsigned int i=0; i<numSaved ;i++)
         {
             double* p = points->GetPoint(i);
 
             tmp[pos++] = p[0];
             tmp[pos++] = p[1];
             tmp[pos++] = p[2];
         }
 
         // write the coordinates to the file
         if ( fwrite((char*)&numSaved, 1, 4, m_FilePointer) != 4 )
         {
             printf( "[ERROR] Problems saving the fiber!\n" );
             return 1;
         }
         if ( fwrite((char*)&(tmp.front()), 1, 4*pos, m_FilePointer) != 4*pos )
         {
             printf( "[ERROR] Problems saving the fiber!\n" );
             return 1;
         }
     }
 
     return 0;
 }
 
 //// Read one fiber from the file
 //// ----------------------------
 short TrackVisFiberReader::read( mitk::FiberBundleX* fib )
 {
     int numPoints;
     vtkSmartPointer<vtkPoints> vtkNewPoints = vtkSmartPointer<vtkPoints>::New();
     vtkSmartPointer<vtkCellArray> vtkNewCells = vtkSmartPointer<vtkCellArray>::New();
 
     while (fread((char*)&numPoints, 1, 4, m_FilePointer)==4)
     {
         if ( numPoints <= 0 )
         {
             printf( "[ERROR] Trying to read a fiber with %d points!\n", numPoints );
             return -1;
         }
         vtkSmartPointer<vtkPolyLine> container = vtkSmartPointer<vtkPolyLine>::New();
 
         float tmp[3];
         for(int i=0; i<numPoints; i++)
         {
             if (fread((char*)tmp, 1, 12, m_FilePointer) == 0)
                 MITK_ERROR << "TrackVis::read: Error during read.";
 
             vtkIdType id = vtkNewPoints->InsertNextPoint(tmp);
             container->GetPointIds()->InsertNextId(id);
         }
         vtkNewCells->InsertNextCell(container);
     }
 
     vtkSmartPointer<vtkPolyData> fiberPolyData = vtkSmartPointer<vtkPolyData>::New();
     fiberPolyData->SetPoints(vtkNewPoints);
     fiberPolyData->SetLines(vtkNewCells);
 
     MITK_INFO << "Coordinate convention: " << m_Header.voxel_order;
 
     mitk::Geometry3D::Pointer geometry = mitk::Geometry3D::New();
     vtkSmartPointer< vtkMatrix4x4 > matrix = vtkSmartPointer< vtkMatrix4x4 >::New();
     matrix->Identity();
 
     if (m_Header.voxel_order[0]=='R')
         matrix->SetElement(0,0,-matrix->GetElement(0,0));
     if (m_Header.voxel_order[1]=='A')
         matrix->SetElement(1,1,-matrix->GetElement(1,1));
     if (m_Header.voxel_order[2]=='I')
         matrix->SetElement(2,2,-matrix->GetElement(2,2));
 
     geometry->SetIndexToWorldTransformByVtkMatrix(matrix);
 
     vtkSmartPointer<vtkTransformPolyDataFilter> transformFilter = vtkSmartPointer<vtkTransformPolyDataFilter>::New();
     transformFilter->SetInputData(fiberPolyData);
     transformFilter->SetTransform(geometry->GetVtkTransform());
     transformFilter->Update();
     fib->SetFiberPolyData(transformFilter->GetOutput());
 
     mitk::Point3D origin;
     origin[0]=m_Header.origin[0];
     origin[1]=m_Header.origin[1];
     origin[2]=m_Header.origin[2];
     geometry->SetOrigin(origin);
 
     mitk::Vector3D spacing;
     spacing[0]=m_Header.voxel_size[0];
     spacing[1]=m_Header.voxel_size[1];
     spacing[2]=m_Header.voxel_size[2];
     geometry->SetSpacing(spacing);
 
     geometry->SetExtentInMM(0, m_Header.voxel_size[0]*m_Header.dim[0]);
     geometry->SetExtentInMM(1, m_Header.voxel_size[1]*m_Header.dim[1]);
     geometry->SetExtentInMM(2, m_Header.voxel_size[2]*m_Header.dim[2]);
 
     fib->SetReferenceGeometry(dynamic_cast<mitk::BaseGeometry*>(geometry.GetPointer()));
 
     return numPoints;
 }
 
 
 
 // Update the field in the header to the new FIBER TOTAL.
 // ------------------------------------------------------
 void TrackVisFiberReader::updateTotal( int totFibers )
 {
     fseek(m_FilePointer, 1000-12, SEEK_SET);
     if (fwrite((char*)&totFibers, 1, 4, m_FilePointer) != 4)
         MITK_ERROR << "[ERROR] Problems saving the fiber!";
 }
 
 
 void TrackVisFiberReader::writeHdr()
 {
     fseek(m_FilePointer, 0, SEEK_SET);
     if (fwrite((char*)&m_Header, 1, 1000, m_FilePointer) != 1000)
         MITK_ERROR << "[ERROR] Problems saving the fiber!";
 }
 
 
 // Close the TrackVis file, but keep the metadata in the header.
 // -------------------------------------------------------------
 void TrackVisFiberReader::close()
 {
     fclose(m_FilePointer);
     m_FilePointer = NULL;
 }
 
 bool TrackVisFiberReader::IsTransformValid()
 {
     if (fabs(m_Header.image_orientation_patient[0])<=0.001 || fabs(m_Header.image_orientation_patient[3])<=0.001 || fabs(m_Header.image_orientation_patient[5])<=0.001)
         return false;
     return true;
 }
diff --git a/Modules/DiffusionImaging/FiberTracking/IODataStructures/FiberBundleX/mitkTrackvis.h b/Modules/DiffusionImaging/FiberTracking/IODataStructures/FiberBundleX/mitkTrackvis.h
index 8d9ad1a8d9..ab48c25597 100644
--- a/Modules/DiffusionImaging/FiberTracking/IODataStructures/FiberBundleX/mitkTrackvis.h
+++ b/Modules/DiffusionImaging/FiberTracking/IODataStructures/FiberBundleX/mitkTrackvis.h
@@ -1,82 +1,82 @@
 /*===================================================================
 
 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.
 
 ===================================================================*/
 #ifndef _TRACKVIS
 #define _TRACKVIS
 
 #include <mitkCommon.h>
 #include <mitkFiberBundleX.h>
 #include <vtkSmartPointer.h>
 #include <vtkPolyData.h>
 #include <vtkCellArray.h>
 #include <vtkPoints.h>
 #include <vtkPolyLine.h>
 #include <itkSize.h>
 
 using namespace std;
 
 // Structure to hold metadata of a TrackVis file
 // ---------------------------------------------
 struct TrackVis_header
 {
     char                id_string[6];
     short int           dim[3];
     float               voxel_size[3];
     float               origin[3];
     short int           n_scalars;
     char                scalar_name[10][20];
     short int           n_properties;
     char                property_name[10][20];
     char                reserved[508];
     char                voxel_order[4];
     char                pad2[4];
     float               image_orientation_patient[6];
     char                pad1[2];
     unsigned char       invert_x;
     unsigned char       invert_y;
     unsigned char       invert_z;
     unsigned char       swap_xy;
     unsigned char       swap_yz;
     unsigned char       swap_zx;
     int                 n_count;
     int                 version;
     int                 hdr_size;
 };
 
 // Class to handle TrackVis files.
 // -------------------------------
 class MitkFiberTracking_EXPORT TrackVisFiberReader
 {
 private:
     string              m_Filename;
     FILE*               m_FilePointer;
 
 public:
     TrackVis_header     m_Header;
 
-    short   create(string m_Filename, mitk::FiberBundleX* fib);
+    short   create(string m_Filename, const mitk::FiberBundleX* fib);
     short   open( string m_Filename );
     short   read( mitk::FiberBundleX* fib );
-    short   append( mitk::FiberBundleX* fib );
+    short   append(const mitk::FiberBundleX* fib );
     void    writeHdr();
     void    updateTotal( int totFibers );
     void    close();
     bool    IsTransformValid();
 
     TrackVisFiberReader();
     ~TrackVisFiberReader();
 };
 
 #endif