diff --git a/Core/Code/DataManagement/mitkSurface.cpp b/Core/Code/DataManagement/mitkSurface.cpp
index 584fc115f2..24428d0980 100644
--- a/Core/Code/DataManagement/mitkSurface.cpp
+++ b/Core/Code/DataManagement/mitkSurface.cpp
@@ -1,385 +1,386 @@
 /*===================================================================
 
 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 "mitkSurface.h"
 #include "mitkInteractionConst.h"
 #include "mitkSurfaceOperation.h"
 
 #include <algorithm>
 #include <vtkPolyData.h>
 
 static vtkPolyData* DeepCopy(vtkPolyData* other)
 {
   if (other == NULL)
     return NULL;
 
   vtkPolyData* copy = vtkPolyData::New();
   copy->DeepCopy(other);
 
   return copy;
 }
 
 static void Delete(vtkPolyData* polyData)
 {
   if (polyData != NULL)
     polyData->Delete();
 }
 
 static void Update(vtkPolyData* polyData)
 {
   if (polyData != NULL)
     polyData->Update();
 }
 
 mitk::Surface::Surface()
   : m_CalculateBoundingBox(false)
 {
   this->InitializeEmpty();
 }
 
 mitk::Surface::Surface(const mitk::Surface& other)
   : BaseData(other),
     m_LargestPossibleRegion(other.m_LargestPossibleRegion),
     m_RequestedRegion(other.m_RequestedRegion),
     m_CalculateBoundingBox(other.m_CalculateBoundingBox)
 {
   if(!other.m_PolyDatas.empty())
   {
     m_PolyDatas.resize(other.m_PolyDatas.size());
     std::transform(other.m_PolyDatas.begin(), other.m_PolyDatas.end(), m_PolyDatas.begin(), DeepCopy);
   }
   else
   {
     this->InitializeEmpty();
   }
 }
 
 void mitk::Surface::Swap(mitk::Surface& other)
 {
   std::swap(m_PolyDatas, other.m_PolyDatas);
   std::swap(m_LargestPossibleRegion, other.m_LargestPossibleRegion);
   std::swap(m_RequestedRegion, other.m_RequestedRegion);
   std::swap(m_CalculateBoundingBox, other.m_CalculateBoundingBox);
 }
 
 mitk::Surface& mitk::Surface::operator=(Surface other)
 {
   this->Swap(other);
   return *this;
 }
 
 mitk::Surface::~Surface()
 {
   this->ClearData();
 }
 
 void mitk::Surface::ClearData()
 {
   using ::Delete;
 
   std::for_each(m_PolyDatas.begin(), m_PolyDatas.end(), Delete);
   m_PolyDatas.clear();
 
   Superclass::ClearData();
 }
 
 const mitk::Surface::RegionType& mitk::Surface::GetLargestPossibleRegion() const
 {
   m_LargestPossibleRegion.SetIndex(3, 0);
   m_LargestPossibleRegion.SetSize(3, GetTimeSlicedGeometry()->GetTimeSteps());
 
   return m_LargestPossibleRegion;
 }
 
 const mitk::Surface::RegionType& mitk::Surface::GetRequestedRegion() const
 {
   return m_RequestedRegion;
 }
 
 void mitk::Surface::InitializeEmpty()
 {
   if (!m_PolyDatas.empty())
     this->ClearData();
 
   Superclass::InitializeTimeSlicedGeometry();
 
   m_PolyDatas.push_back(NULL);
   m_Initialized = true;
 }
 
 void mitk::Surface::SetVtkPolyData(vtkPolyData* polyData, unsigned int t)
 {
   this->Expand(t + 1);
 
   if (m_PolyDatas[t] != NULL)
   {
     if (m_PolyDatas[t] == polyData)
       return;
 
     m_PolyDatas[t]->Delete();
   }
 
   m_PolyDatas[t] = polyData;
 
   if(polyData != NULL)
     polyData->Register(NULL);
 
   m_CalculateBoundingBox = true;
 
   this->Modified();
   this->UpdateOutputInformation();
 }
 
 bool mitk::Surface::IsEmptyTimeStep(unsigned int t) const
 {
   if(!IsInitialized())
     return false;
 
   vtkPolyData* polyData = const_cast<Surface*>(this)->GetVtkPolyData(t);
 
-  return polyData == NULL ||
+  return polyData == NULL || (
     polyData->GetNumberOfLines() == 0 &&
     polyData->GetNumberOfPolys() == 0 &&
     polyData->GetNumberOfStrips() == 0 &&
-    polyData->GetNumberOfVerts() == 0;
+    polyData->GetNumberOfVerts() == 0
+  );
 }
 
 vtkPolyData* mitk::Surface::GetVtkPolyData(unsigned int t)
 {
   if (t < m_PolyDatas.size())
   {
     if(m_PolyDatas[t] == NULL && this->GetSource().IsNotNull())
     {
       RegionType requestedRegion;
       requestedRegion.SetIndex(3, t);
       requestedRegion.SetSize(3, 1);
 
       this->SetRequestedRegion(&requestedRegion);
       this->GetSource()->Update();
     }
 
     return m_PolyDatas[t];
   }
 
   return NULL;
 }
 
 void mitk::Surface::UpdateOutputInformation()
 {
   if (this->GetSource().IsNotNull())
     this->GetSource()->UpdateOutputInformation();
 
   if (m_CalculateBoundingBox == true && !m_PolyDatas.empty())
     this->CalculateBoundingBox();
   else
     this->GetTimeSlicedGeometry()->UpdateInformation();
 }
 
 void mitk::Surface::CalculateBoundingBox()
 {
   mitk::TimeSlicedGeometry* timeSlicedGeometry = this->GetTimeSlicedGeometry();
 
   if (timeSlicedGeometry->GetTimeSteps() != m_PolyDatas.size())
     mitkThrow() << "Number of geometry time steps is inconsistent with number of poly data pointers.";
 
   for (unsigned int i = 0; i < m_PolyDatas.size(); ++i)
   {
     vtkPolyData* polyData = m_PolyDatas[i];
     vtkFloatingPointType bounds[6] = {0};
 
     if (polyData != NULL && polyData->GetNumberOfPoints() > 0)
     {
       polyData->Update();
       polyData->ComputeBounds();
       polyData->GetBounds(bounds);
     }
 
     mitk::Geometry3D::Pointer geometry = timeSlicedGeometry->GetGeometry3D(i);
 
     if (geometry.IsNull())
       mitkThrow() << "Time-sliced geometry is invalid (equals NULL).";
 
     geometry->SetFloatBounds(bounds);
   }
 
   timeSlicedGeometry->UpdateInformation();
   m_CalculateBoundingBox = false;
 }
 
 void mitk::Surface::SetRequestedRegionToLargestPossibleRegion()
 {
   m_RequestedRegion = GetLargestPossibleRegion();
 }
 
 bool mitk::Surface::RequestedRegionIsOutsideOfTheBufferedRegion()
 {
   RegionType::IndexValueType end = m_RequestedRegion.GetIndex(3) + m_RequestedRegion.GetSize(3);
 
   if(static_cast<RegionType::IndexValueType>(m_PolyDatas.size()) < end)
     return true;
 
   for(RegionType::IndexValueType t = m_RequestedRegion.GetIndex(3); t < end; ++t)
   {
     if(m_PolyDatas[t] == NULL)
       return true;
   }
 
   return false;
 }
 
 bool mitk::Surface::VerifyRequestedRegion()
 {
   if(m_RequestedRegion.GetIndex(3) >= 0 && m_RequestedRegion.GetIndex(3) + m_RequestedRegion.GetSize(3) <= m_PolyDatas.size())
     return true;
 
   return false;
 }
 
 void mitk::Surface::SetRequestedRegion(itk::DataObject* data)
 {
   mitk::Surface* surface = dynamic_cast<mitk::Surface*>(data);
 
   if (surface != NULL)
     m_RequestedRegion = surface->GetRequestedRegion();
   else
     mitkThrow() << "Data object used to get requested region is not a mitk::Surface.";
 }
 
 void mitk::Surface::SetRequestedRegion(Surface::RegionType* region)
 {
   if (region == NULL)
     mitkThrow() << "Requested region is invalid (equals NULL)";
 
   m_RequestedRegion = *region;
 }
 
 void mitk::Surface::CopyInformation(const itk::DataObject* data)
 {
   Superclass::CopyInformation(data);
 
   const mitk::Surface* surface = dynamic_cast<const mitk::Surface*>(data);
 
   if (surface == NULL)
     mitkThrow() << "Data object used to get largest possible region is not a mitk::Surface.";
 
   m_LargestPossibleRegion = surface->GetLargestPossibleRegion();
 }
 
 void mitk::Surface::Update()
 {
   using ::Update;
 
   if (this->GetSource().IsNull())
     std::for_each(m_PolyDatas.begin(), m_PolyDatas.end(), Update);
 
   Superclass::Update();
 }
 
 void mitk::Surface::Expand(unsigned int timeSteps)
 {
   if (timeSteps > m_PolyDatas.size())
   {
     Superclass::Expand(timeSteps);
 
     m_PolyDatas.resize(timeSteps);
     m_CalculateBoundingBox = true;
   }
 }
 
 void mitk::Surface::ExecuteOperation(Operation* operation)
 {
   switch (operation->GetOperationType())
   {
     case OpSURFACECHANGED:
     {
       mitk::SurfaceOperation* surfaceOperation = dynamic_cast<mitk::SurfaceOperation*>(operation);
 
       if(surfaceOperation == NULL)
         break;
 
       unsigned int timeStep = surfaceOperation->GetTimeStep();
 
       if(m_PolyDatas[timeStep] != NULL)
       {
         vtkPolyData* updatedPolyData = surfaceOperation->GetVtkPolyData();
 
         if(updatedPolyData != NULL)
         {
           this->SetVtkPolyData(updatedPolyData, timeStep);
           this->CalculateBoundingBox();
           this->Modified();
         }
       }
 
       break;
     }
 
     default:
       return;
   }
 }
 
 unsigned int mitk::Surface::GetSizeOfPolyDataSeries() const
 {
   return m_PolyDatas.size();
 }
 
 void mitk::Surface::Graft(const DataObject* data)
 {
   const Surface* surface = dynamic_cast<const Surface*>(data);
 
   if(surface == NULL)
     mitkThrow() << "Data object used to graft surface is not a mitk::Surface.";
 
   this->CopyInformation(data);
   m_PolyDatas.clear();
 
   for (unsigned int i = 0; i < surface->GetSizeOfPolyDataSeries(); ++i)
   {
     m_PolyDatas.push_back(vtkPolyData::New());
     m_PolyDatas.back()->DeepCopy(const_cast<mitk::Surface*>(surface)->GetVtkPolyData(i));
   }
 }
 
 void mitk::Surface::PrintSelf(std::ostream& os, itk::Indent indent) const
 {
   Superclass::PrintSelf(os, indent);
 
   os << indent << "\nNumber PolyDatas: " << m_PolyDatas.size() << "\n";
 
   unsigned int count = 0;
 
   for (std::vector<vtkPolyData*>::const_iterator it = m_PolyDatas.begin(); it != m_PolyDatas.end(); ++it)
   {
     os << "\n";
 
     if(*it != NULL)
     {
       os << indent << "PolyData at time step " << count << ":\n";
       os << indent << "Number of cells: " << (*it)->GetNumberOfCells() << "\n";
       os << indent << "Number of points: " << (*it)->GetNumberOfPoints() << "\n\n";
       os << indent << "VTKPolyData:\n";
 
       (*it)->Print(os);
     }
     else
     {
       os << indent << "Empty PolyData at time step " << count << "\n";
     }
 
     ++count;
   }
 }