mitkGPUVolumeMapper3D.cpp

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/*===================================================================

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 GPU_INFO MITK_INFO("mapper.vr")
#define GPU_WARN MITK_WARN("mapper.vr")
#define GPU_ERROR MITK_ERROR("mapper.vr")

#include <vtkAutoInit.h>
VTK_MODULE_INIT(vtkRenderingVolumeOpenGL);

#include "mitkGPUVolumeMapper3D.h"

#include "mitkDataNode.h"

#include "mitkColorProperty.h"
#include "mitkColorProperty.h"
#include "mitkLevelWindow.h"
#include "mitkLevelWindowProperty.h"
#include "mitkLookupTableProperty.h"
#include "mitkProperties.h"
#include "mitkRenderingManager.h"
#include "mitkTransferFunctionInitializer.h"
#include "mitkTransferFunctionProperty.h"
#include "mitkVtkPropRenderer.h"

#include <vtkActor.h>
#include <vtkProperty.h>

#include <vtkAssembly.h>
#include <vtkColorTransferFunction.h>
#include <vtkFiniteDifferenceGradientEstimator.h>
#include <vtkImageData.h>
#include <vtkImageResample.h>
#include <vtkImageWriter.h>
#include <vtkImplicitPlaneWidget.h>
#include <vtkLODProp3D.h>
#include <vtkPiecewiseFunction.h>
#include <vtkPlane.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkVolume.h>
#include <vtkVolumeProperty.h>
#include <vtkVolumeRayCastCompositeFunction.h>
#include <vtkVolumeRayCastMIPFunction.h>
#include <vtkVolumeTextureMapper2D.h>

#include <vtkCubeSource.h>
#include <vtkPolyDataMapper.h>

// Only with VTK 5.6 or above
#if ((VTK_MAJOR_VERSION > 5) || ((VTK_MAJOR_VERSION == 5) && (VTK_MINOR_VERSION >= 6)))

#include "vtkMitkGPUVolumeRayCastMapper.h"

#endif

#include "vtkMitkOpenGLVolumeTextureMapper3D.h"
#include "vtkOpenGLGPUVolumeRayCastMapper.h"

const mitk::Image *mitk::GPUVolumeMapper3D::GetInput()
{
  return static_cast<const mitk::Image *>(GetDataNode()->GetData());
}

void mitk::GPUVolumeMapper3D::MitkRenderVolumetricGeometry(mitk::BaseRenderer *renderer)
{
  LocalStorage *ls = m_LSH.GetLocalStorage(renderer);

  VtkMapper::MitkRenderVolumetricGeometry(renderer);

  if (ls->m_gpuInitialized)
    ls->m_MapperGPU->UpdateMTime();
}

bool mitk::GPUVolumeMapper3D::InitGPU(mitk::BaseRenderer *renderer)
{
  LocalStorage *ls = m_LSH.GetLocalStorage(renderer);

  if (ls->m_gpuInitialized)
    return ls->m_gpuSupported;

  ls->m_VtkRenderWindow = renderer->GetVtkRenderer()->GetRenderWindow();

  GPU_INFO << "initializing gpu-slicing-vr (vtkMitkOpenGLVolumeTextureMapper3D)";

  ls->m_MapperGPU = vtkSmartPointer<vtkMitkOpenGLVolumeTextureMapper3D>::New();
  ls->m_MapperGPU->SetUseCompressedTexture(false);
  ls->m_MapperGPU->SetSampleDistance(1.0);

  ls->m_VolumePropertyGPU = vtkSmartPointer<vtkVolumeProperty>::New();
  ls->m_VolumePropertyGPU->ShadeOn();
  ls->m_VolumePropertyGPU->SetAmbient(0.25f);  // 0.05f
  ls->m_VolumePropertyGPU->SetDiffuse(0.50f);  // 0.45f
  ls->m_VolumePropertyGPU->SetSpecular(0.40f); // 0.50f
  ls->m_VolumePropertyGPU->SetSpecularPower(16.0f);
  ls->m_VolumePropertyGPU->SetInterpolationTypeToLinear();

  ls->m_VolumeGPU = vtkSmartPointer<vtkVolume>::New();
  ls->m_VolumeGPU->SetMapper(ls->m_MapperGPU);
  ls->m_VolumeGPU->SetProperty(ls->m_VolumePropertyGPU);
  ls->m_VolumeGPU->VisibilityOn();

  ls->m_MapperGPU->SetInputConnection(this->m_UnitSpacingImageFilter->GetOutputPort());

  ls->m_gpuSupported = ls->m_MapperGPU->IsRenderSupported(renderer->GetVtkRenderer(), ls->m_VolumePropertyGPU);

  ls->m_gpuInitialized = true;

  return ls->m_gpuSupported;
}

void mitk::GPUVolumeMapper3D::InitCPU(mitk::BaseRenderer *renderer)
{
  LocalStorage *ls = m_LSH.GetLocalStorage(renderer);

  if (ls->m_cpuInitialized)
    return;

  ls->m_VtkRenderWindow = renderer->GetVtkRenderer()->GetRenderWindow();

  ls->m_MapperCPU = vtkSmartPointer<vtkFixedPointVolumeRayCastMapper>::New();
  int numThreads = ls->m_MapperCPU->GetNumberOfThreads();

  GPU_INFO << "initializing cpu-raycast-vr (vtkFixedPointVolumeRayCastMapper) (" << numThreads << " threads)";

  ls->m_MapperCPU->SetSampleDistance(1.0);
  //  ls->m_MapperCPU->LockSampleDistanceToInputSpacingOn();
  ls->m_MapperCPU->SetImageSampleDistance(1.0);
  ls->m_MapperCPU->IntermixIntersectingGeometryOn();
  ls->m_MapperCPU->SetAutoAdjustSampleDistances(0);

  ls->m_VolumePropertyCPU = vtkSmartPointer<vtkVolumeProperty>::New();
  ls->m_VolumePropertyCPU->ShadeOn();
  ls->m_VolumePropertyCPU->SetAmbient(0.10f);  // 0.05f
  ls->m_VolumePropertyCPU->SetDiffuse(0.50f);  // 0.45f
  ls->m_VolumePropertyCPU->SetSpecular(0.40f); // 0.50f
  ls->m_VolumePropertyCPU->SetSpecularPower(16.0f);
  ls->m_VolumePropertyCPU->SetInterpolationTypeToLinear();

  ls->m_VolumeCPU = vtkSmartPointer<vtkVolume>::New();
  ls->m_VolumeCPU->SetMapper(ls->m_MapperCPU);
  ls->m_VolumeCPU->SetProperty(ls->m_VolumePropertyCPU);
  ls->m_VolumeCPU->VisibilityOn();

  ls->m_MapperCPU->SetInputConnection(m_UnitSpacingImageFilter->GetOutputPort()); // m_Resampler->GetOutput());

  ls->m_cpuInitialized = true;
}

void mitk::GPUVolumeMapper3D::DeinitGPU(mitk::BaseRenderer *renderer)
{
  LocalStorage *ls = m_LSH.GetLocalStorage(renderer);

  if (ls->m_gpuInitialized)
  {
    GPU_INFO << "deinitializing gpu-slicing-vr";
    // deinit renderwindow, this is needed to release the memory allocated on the gpu
    // to prevent leaking memory on the gpu
    ls->m_MapperGPU->ReleaseGraphicsResources(renderer->GetVtkRenderer()->GetVTKWindow());
    ls->m_VolumePropertyGPU = NULL;
    ls->m_MapperGPU = NULL;
    ls->m_VolumeGPU = NULL;
    ls->m_gpuInitialized = false;
  }
}

void mitk::GPUVolumeMapper3D::DeinitCPU(mitk::BaseRenderer *renderer)
{
  LocalStorage *ls = m_LSH.GetLocalStorage(renderer);

  if (!ls->m_cpuInitialized)
    return;

  GPU_INFO << "deinitializing cpu-raycast-vr";

  ls->m_VolumePropertyCPU = NULL;
  ls->m_MapperCPU = NULL;
  ls->m_VolumeCPU = NULL;
  ls->m_cpuInitialized = false;
}

mitk::GPUVolumeMapper3D::GPUVolumeMapper3D()
{
  m_VolumeNULL = 0;
  m_commonInitialized = false;
}

mitk::GPUVolumeMapper3D::~GPUVolumeMapper3D()
{
  DeinitCommon();
}

void mitk::GPUVolumeMapper3D::InitCommon()
{
  if (m_commonInitialized)
    return;

  m_UnitSpacingImageFilter = vtkSmartPointer<vtkImageChangeInformation>::New();
  m_UnitSpacingImageFilter->SetOutputSpacing(1.0, 1.0, 1.0);

  CreateDefaultTransferFunctions();

  m_commonInitialized = true;
}

void mitk::GPUVolumeMapper3D::DeinitCommon()
{
  if (!m_commonInitialized)
    return;

  m_commonInitialized = false;
}

bool mitk::GPUVolumeMapper3D::IsRenderable(mitk::BaseRenderer *renderer)
{
  if (!GetDataNode())
    return false;

  DataNode *node = GetDataNode();

  bool visible = true;
  node->GetVisibility(visible, renderer, "visible");

  if (!visible)
    return false;

  bool value = false;
  if (!node->GetBoolProperty("volumerendering", value, renderer))
    return false;

  if (!value)
    return false;

  mitk::Image *input = const_cast<mitk::Image *>(this->GetInput());

  if (!input || !input->IsInitialized())
    return false;

  vtkImageData *inputData = input->GetVtkImageData(this->GetTimestep());

  if (inputData == NULL)
    return false;

  return true;
}

void mitk::GPUVolumeMapper3D::InitVtkMapper(mitk::BaseRenderer *renderer)
{
// Only with VTK 5.6 or above
#if ((VTK_MAJOR_VERSION > 5) || ((VTK_MAJOR_VERSION == 5) && (VTK_MINOR_VERSION >= 6)))
  if (IsRAYEnabled(renderer))
  {
    DeinitCPU(renderer);
    DeinitGPU(renderer);
    if (!InitRAY(renderer))
    {
      GPU_WARN << "hardware renderer can't initialize ... falling back to software renderer";
      goto fallback;
    }
  }
  else
#endif
    if (IsGPUEnabled(renderer))
  {
    DeinitCPU(renderer);
// Only with VTK 5.6 or above
#if ((VTK_MAJOR_VERSION > 5) || ((VTK_MAJOR_VERSION == 5) && (VTK_MINOR_VERSION >= 6)))
    DeinitRAY(renderer);
#endif
    if (!InitGPU(renderer))
    {
      GPU_WARN << "hardware renderer can't initialize ... falling back to software renderer";
      goto fallback;
    }
  }
  else
  {
  fallback:
    DeinitGPU(renderer);
// Only with VTK 5.6 or above
#if ((VTK_MAJOR_VERSION > 5) || ((VTK_MAJOR_VERSION == 5) && (VTK_MINOR_VERSION >= 6)))
    DeinitRAY(renderer);
#endif
    InitCPU(renderer);
  }
}

vtkProp *mitk::GPUVolumeMapper3D::GetVtkProp(mitk::BaseRenderer *renderer)
{
  if (!IsRenderable(renderer))
  {
    if (!m_VolumeNULL)
    {
      m_VolumeNULL = vtkSmartPointer<vtkVolume>::New();
      m_VolumeNULL->VisibilityOff();
    }
    return m_VolumeNULL;
  }

  InitCommon();
  InitVtkMapper(renderer);

  LocalStorage *ls = m_LSH.GetLocalStorage(renderer);

// Only with VTK 5.6 or above
#if ((VTK_MAJOR_VERSION > 5) || ((VTK_MAJOR_VERSION == 5) && (VTK_MINOR_VERSION >= 6)))
  if (ls->m_rayInitialized)
    return ls->m_VolumeRAY;
#endif

  if (ls->m_gpuInitialized)
    return ls->m_VolumeGPU;

  return ls->m_VolumeCPU;
}

void mitk::GPUVolumeMapper3D::GenerateDataForRenderer(mitk::BaseRenderer *renderer)
{
  if (!IsRenderable(renderer))
    return;

  InitCommon();
  InitVtkMapper(renderer);

  mitk::Image *input = const_cast<mitk::Image *>(this->GetInput());
  vtkImageData *inputData = input->GetVtkImageData(this->GetTimestep());
  m_UnitSpacingImageFilter->SetInputData(inputData);

  LocalStorage *ls = m_LSH.GetLocalStorage(renderer);

// Only with VTK 5.6 or above
#if ((VTK_MAJOR_VERSION > 5) || ((VTK_MAJOR_VERSION == 5) && (VTK_MINOR_VERSION >= 6)))
  if (ls->m_rayInitialized)
  {
    GenerateDataRAY(renderer);
  }
  else
#endif

    if (ls->m_gpuInitialized)
  {
    GenerateDataGPU(renderer);
  }
  else
  {
    GenerateDataCPU(renderer);
  }

  // UpdateTransferFunctions
  UpdateTransferFunctions(renderer);
}

void mitk::GPUVolumeMapper3D::GenerateDataGPU(mitk::BaseRenderer *renderer)
{
  LocalStorage *ls = m_LSH.GetLocalStorage(renderer);

  bool useCompression = false;
  GetDataNode()->GetBoolProperty("volumerendering.gpu.usetexturecompression", useCompression, renderer);
  ls->m_MapperGPU->SetUseCompressedTexture(useCompression);

  if (IsLODEnabled(renderer) && mitk::RenderingManager::GetInstance()->GetNextLOD(renderer) == 0)
    ls->m_MapperGPU->SetSampleDistance(2.0);
  else
    ls->m_MapperGPU->SetSampleDistance(1.0);

  // Updating shadings
  {
    float value = 0;
    if (GetDataNode()->GetFloatProperty("volumerendering.gpu.ambient", value, renderer))
      ls->m_VolumePropertyGPU->SetAmbient(value);
    if (GetDataNode()->GetFloatProperty("volumerendering.gpu.diffuse", value, renderer))
      ls->m_VolumePropertyGPU->SetDiffuse(value);
    if (GetDataNode()->GetFloatProperty("volumerendering.gpu.specular", value, renderer))
      ls->m_VolumePropertyGPU->SetSpecular(value);
    if (GetDataNode()->GetFloatProperty("volumerendering.gpu.specular.power", value, renderer))
      ls->m_VolumePropertyGPU->SetSpecularPower(value);
  }
}

void mitk::GPUVolumeMapper3D::GenerateDataCPU(mitk::BaseRenderer *renderer)
{
  LocalStorage *ls = m_LSH.GetLocalStorage(renderer);

  int nextLod = mitk::RenderingManager::GetInstance()->GetNextLOD(renderer);

  if (IsLODEnabled(renderer) && nextLod == 0)
  {
    ls->m_MapperCPU->SetImageSampleDistance(3.5);
    ls->m_MapperCPU->SetSampleDistance(1.25);
    ls->m_VolumePropertyCPU->SetInterpolationTypeToNearest();
  }
  else
  {
    ls->m_MapperCPU->SetImageSampleDistance(1.0);
    ls->m_MapperCPU->SetSampleDistance(1.0);
    ls->m_VolumePropertyCPU->SetInterpolationTypeToLinear();
  }

  // Check raycasting mode
  if (IsMIPEnabled(renderer))
    ls->m_MapperCPU->SetBlendModeToMaximumIntensity();
  else
    ls->m_MapperCPU->SetBlendModeToComposite();

  // Updating shadings
  {
    float value = 0;
    if (GetDataNode()->GetFloatProperty("volumerendering.cpu.ambient", value, renderer))
      ls->m_VolumePropertyCPU->SetAmbient(value);
    if (GetDataNode()->GetFloatProperty("volumerendering.cpu.diffuse", value, renderer))
      ls->m_VolumePropertyCPU->SetDiffuse(value);
    if (GetDataNode()->GetFloatProperty("volumerendering.cpu.specular", value, renderer))
      ls->m_VolumePropertyCPU->SetSpecular(value);
    if (GetDataNode()->GetFloatProperty("volumerendering.cpu.specular.power", value, renderer))
      ls->m_VolumePropertyCPU->SetSpecularPower(value);
  }
}

void mitk::GPUVolumeMapper3D::CreateDefaultTransferFunctions()
{
  m_DefaultOpacityTransferFunction = vtkSmartPointer<vtkPiecewiseFunction>::New();
  m_DefaultOpacityTransferFunction->AddPoint(0.0, 0.0);
  m_DefaultOpacityTransferFunction->AddPoint(255.0, 0.8);
  m_DefaultOpacityTransferFunction->ClampingOn();

  m_DefaultGradientTransferFunction = vtkSmartPointer<vtkPiecewiseFunction>::New();
  m_DefaultGradientTransferFunction->AddPoint(0.0, 0.0);
  m_DefaultGradientTransferFunction->AddPoint(255.0, 0.8);
  m_DefaultGradientTransferFunction->ClampingOn();

  m_DefaultColorTransferFunction = vtkSmartPointer<vtkColorTransferFunction>::New();
  m_DefaultColorTransferFunction->AddRGBPoint(0.0, 0.0, 0.0, 0.0);
  m_DefaultColorTransferFunction->AddRGBPoint(127.5, 1, 1, 0.0);
  m_DefaultColorTransferFunction->AddRGBPoint(255.0, 0.8, 0.2, 0);
  m_DefaultColorTransferFunction->ClampingOn();

  m_BinaryOpacityTransferFunction = vtkSmartPointer<vtkPiecewiseFunction>::New();
  m_BinaryOpacityTransferFunction->AddPoint(0, 0.0);
  m_BinaryOpacityTransferFunction->AddPoint(1, 1.0);

  m_BinaryGradientTransferFunction = vtkSmartPointer<vtkPiecewiseFunction>::New();
  m_BinaryGradientTransferFunction->AddPoint(0.0, 1.0);

  m_BinaryColorTransferFunction = vtkSmartPointer<vtkColorTransferFunction>::New();
}

void mitk::GPUVolumeMapper3D::UpdateTransferFunctions(mitk::BaseRenderer *renderer)
{
  LocalStorage *ls = m_LSH.GetLocalStorage(renderer);

  vtkPiecewiseFunction *opacityTransferFunction = m_DefaultOpacityTransferFunction;
  vtkPiecewiseFunction *gradientTransferFunction = m_DefaultGradientTransferFunction;
  vtkColorTransferFunction *colorTransferFunction = m_DefaultColorTransferFunction;

  bool isBinary = false;

  GetDataNode()->GetBoolProperty("binary", isBinary, renderer);

  if (isBinary)
  {
    opacityTransferFunction = m_BinaryOpacityTransferFunction;
    gradientTransferFunction = m_BinaryGradientTransferFunction;
    colorTransferFunction = m_BinaryColorTransferFunction;

    colorTransferFunction->RemoveAllPoints();
    float rgb[3];
    if (!GetDataNode()->GetColor(rgb, renderer))
      rgb[0] = rgb[1] = rgb[2] = 1;
    colorTransferFunction->AddRGBPoint(0, rgb[0], rgb[1], rgb[2]);
    colorTransferFunction->Modified();
  }
  else
  {
    mitk::TransferFunctionProperty *transferFunctionProp =
      dynamic_cast<mitk::TransferFunctionProperty *>(this->GetDataNode()->GetProperty("TransferFunction", renderer));

    if (transferFunctionProp)
    {
      opacityTransferFunction = transferFunctionProp->GetValue()->GetScalarOpacityFunction();
      gradientTransferFunction = transferFunctionProp->GetValue()->GetGradientOpacityFunction();
      colorTransferFunction = transferFunctionProp->GetValue()->GetColorTransferFunction();
    }
  }

  if (ls->m_gpuInitialized)
  {
    ls->m_VolumePropertyGPU->SetColor(colorTransferFunction);
    ls->m_VolumePropertyGPU->SetScalarOpacity(opacityTransferFunction);
    ls->m_VolumePropertyGPU->SetGradientOpacity(gradientTransferFunction);
  }

// Only with VTK 5.6 or above
#if ((VTK_MAJOR_VERSION > 5) || ((VTK_MAJOR_VERSION == 5) && (VTK_MINOR_VERSION >= 6)))

  if (ls->m_rayInitialized)
  {
    ls->m_VolumePropertyRAY->SetColor(colorTransferFunction);
    ls->m_VolumePropertyRAY->SetScalarOpacity(opacityTransferFunction);
    ls->m_VolumePropertyRAY->SetGradientOpacity(gradientTransferFunction);
  }

#endif

  if (ls->m_cpuInitialized)
  {
    ls->m_VolumePropertyCPU->SetColor(colorTransferFunction);
    ls->m_VolumePropertyCPU->SetScalarOpacity(opacityTransferFunction);
    ls->m_VolumePropertyCPU->SetGradientOpacity(gradientTransferFunction);
  }
}

void mitk::GPUVolumeMapper3D::ApplyProperties(vtkActor * /*actor*/, mitk::BaseRenderer * /*renderer*/)
{
  // GPU_INFO << "ApplyProperties";
}

void mitk::GPUVolumeMapper3D::SetDefaultProperties(mitk::DataNode *node, mitk::BaseRenderer *renderer, bool overwrite)
{
  // GPU_INFO << "SetDefaultProperties";

  node->AddProperty("volumerendering", mitk::BoolProperty::New(false), renderer, overwrite);
  node->AddProperty("volumerendering.usemip", mitk::BoolProperty::New(false), renderer, overwrite);
  node->AddProperty("volumerendering.uselod", mitk::BoolProperty::New(false), renderer, overwrite);

  node->AddProperty("volumerendering.cpu.ambient", mitk::FloatProperty::New(0.10f), renderer, overwrite);
  node->AddProperty("volumerendering.cpu.diffuse", mitk::FloatProperty::New(0.50f), renderer, overwrite);
  node->AddProperty("volumerendering.cpu.specular", mitk::FloatProperty::New(0.40f), renderer, overwrite);
  node->AddProperty("volumerendering.cpu.specular.power", mitk::FloatProperty::New(16.0f), renderer, overwrite);
  bool usegpu = true;
#ifdef __APPLE__
  usegpu = false;
  node->AddProperty("volumerendering.uselod", mitk::BoolProperty::New(true), renderer, overwrite);
#endif
  node->AddProperty("volumerendering.usegpu", mitk::BoolProperty::New(usegpu), renderer, overwrite);

// Only with VTK 5.6 or above
#if ((VTK_MAJOR_VERSION > 5) || ((VTK_MAJOR_VERSION == 5) && (VTK_MINOR_VERSION >= 6)))

  node->AddProperty("volumerendering.useray", mitk::BoolProperty::New(false), renderer, overwrite);

  node->AddProperty("volumerendering.ray.ambient", mitk::FloatProperty::New(0.25f), renderer, overwrite);
  node->AddProperty("volumerendering.ray.diffuse", mitk::FloatProperty::New(0.50f), renderer, overwrite);
  node->AddProperty("volumerendering.ray.specular", mitk::FloatProperty::New(0.40f), renderer, overwrite);
  node->AddProperty("volumerendering.ray.specular.power", mitk::FloatProperty::New(16.0f), renderer, overwrite);

#endif
  node->AddProperty("volumerendering.gpu.ambient", mitk::FloatProperty::New(0.25f), renderer, overwrite);
  node->AddProperty("volumerendering.gpu.diffuse", mitk::FloatProperty::New(0.50f), renderer, overwrite);
  node->AddProperty("volumerendering.gpu.specular", mitk::FloatProperty::New(0.40f), renderer, overwrite);
  node->AddProperty("volumerendering.gpu.specular.power", mitk::FloatProperty::New(16.0f), renderer, overwrite);
  node->AddProperty("volumerendering.gpu.usetexturecompression", mitk::BoolProperty::New(false), renderer, overwrite);
  node->AddProperty("volumerendering.gpu.reducesliceartifacts", mitk::BoolProperty::New(false), renderer, overwrite);

  node->AddProperty("binary", mitk::BoolProperty::New(false), renderer, overwrite);

  mitk::Image::Pointer image = dynamic_cast<mitk::Image *>(node->GetData());
  if (image.IsNotNull() && image->IsInitialized())
  {
    if ((overwrite) || (node->GetProperty("levelwindow", renderer) == NULL))
    {
      mitk::LevelWindowProperty::Pointer levWinProp = mitk::LevelWindowProperty::New();
      mitk::LevelWindow levelwindow;
      levelwindow.SetAuto(image);
      levWinProp->SetLevelWindow(levelwindow);
      node->SetProperty("levelwindow", levWinProp, renderer);
    }

    if ((overwrite) || (node->GetProperty("TransferFunction", renderer) == NULL))
    {
      // add a default transfer function
      mitk::TransferFunction::Pointer tf = mitk::TransferFunction::New();
      mitk::TransferFunctionInitializer::Pointer tfInit = mitk::TransferFunctionInitializer::New(tf);
      tfInit->SetTransferFunctionMode(0);
      node->SetProperty("TransferFunction", mitk::TransferFunctionProperty::New(tf.GetPointer()));
    }
  }

  Superclass::SetDefaultProperties(node, renderer, overwrite);
}

bool mitk::GPUVolumeMapper3D::IsLODEnabled(mitk::BaseRenderer *renderer) const
{
  bool value = false;
  return GetDataNode()->GetBoolProperty("volumerendering.uselod", value, renderer) && value;
}

bool mitk::GPUVolumeMapper3D::IsMIPEnabled(mitk::BaseRenderer *renderer)
{
  bool value = false;
  return GetDataNode()->GetBoolProperty("volumerendering.usemip", value, renderer) && value;
}

bool mitk::GPUVolumeMapper3D::IsGPUEnabled(mitk::BaseRenderer *renderer)
{
  LocalStorage *ls = m_LSH.GetLocalStorage(renderer);
  bool value = false;
  return ls->m_gpuSupported && GetDataNode()->GetBoolProperty("volumerendering.usegpu", value, renderer) && value;
}

// Only with VTK 5.6 or above
#if ((VTK_MAJOR_VERSION > 5) || ((VTK_MAJOR_VERSION == 5) && (VTK_MINOR_VERSION >= 6)))

bool mitk::GPUVolumeMapper3D::InitRAY(mitk::BaseRenderer *renderer)
{
  LocalStorage *ls = m_LSH.GetLocalStorage(renderer);

  if (ls->m_rayInitialized)
    return ls->m_raySupported;

  ls->m_VtkRenderWindow = renderer->GetVtkRenderer()->GetRenderWindow();

  GPU_INFO << "initializing gpu-raycast-vr (vtkOpenGLGPUVolumeRayCastMapper)";

  ls->m_MapperRAY = vtkSmartPointer<vtkOpenGLGPUVolumeRayCastMapper>::New();
  ls->m_MapperRAY->SetAutoAdjustSampleDistances(0);
  ls->m_MapperRAY->SetSampleDistance(1.0);

  ls->m_VolumePropertyRAY = vtkSmartPointer<vtkVolumeProperty>::New();
  ls->m_VolumePropertyRAY->ShadeOn();
  ls->m_VolumePropertyRAY->SetAmbient(0.25f);  // 0.05f
  ls->m_VolumePropertyRAY->SetDiffuse(0.50f);  // 0.45f
  ls->m_VolumePropertyRAY->SetSpecular(0.40f); // 0.50f
  ls->m_VolumePropertyRAY->SetSpecularPower(16.0f);
  ls->m_VolumePropertyRAY->SetInterpolationTypeToLinear();

  ls->m_VolumeRAY = vtkSmartPointer<vtkVolume>::New();
  ls->m_VolumeRAY->SetMapper(ls->m_MapperRAY);
  ls->m_VolumeRAY->SetProperty(ls->m_VolumePropertyRAY);
  ls->m_VolumeRAY->VisibilityOn();

  ls->m_MapperRAY->SetInputConnection(this->m_UnitSpacingImageFilter->GetOutputPort());

  ls->m_raySupported = ls->m_MapperRAY->IsRenderSupported(renderer->GetRenderWindow(), ls->m_VolumePropertyRAY);

  ls->m_rayInitialized = true;
  return ls->m_raySupported;
}

void mitk::GPUVolumeMapper3D::DeinitRAY(mitk::BaseRenderer *renderer)
{
  LocalStorage *ls = m_LSH.GetLocalStorage(renderer);

  if (ls->m_rayInitialized)
  {
    GPU_INFO << "deinitializing gpu-raycast-vr";

    ls->m_MapperRAY = NULL;
    ls->m_VolumePropertyRAY = NULL;
    // Here ReleaseGraphicsResources has to be called to avoid VTK error messages.
    // This seems like a VTK bug, because ReleaseGraphicsResources() is ment for internal use,
    // but you cannot just delete the object (last smartpointer reference) without getting the
    // VTK error.
    ls->m_VolumeRAY->ReleaseGraphicsResources(renderer->GetVtkRenderer()->GetRenderWindow());
    ls->m_VolumeRAY = NULL;
    ls->m_rayInitialized = false;
  }
}

void mitk::GPUVolumeMapper3D::GenerateDataRAY(mitk::BaseRenderer *renderer)
{
  LocalStorage *ls = m_LSH.GetLocalStorage(renderer);

  if (IsLODEnabled(renderer) && mitk::RenderingManager::GetInstance()->GetNextLOD(renderer) == 0)
    ls->m_MapperRAY->SetImageSampleDistance(4.0);
  else
    ls->m_MapperRAY->SetImageSampleDistance(1.0);

  // Check raycasting mode
  if (IsMIPEnabled(renderer))
    ls->m_MapperRAY->SetBlendModeToMaximumIntensity();
  else
    ls->m_MapperRAY->SetBlendModeToComposite();

  // Updating shadings
  {
    float value = 0;
    if (GetDataNode()->GetFloatProperty("volumerendering.ray.ambient", value, renderer))
      ls->m_VolumePropertyRAY->SetAmbient(value);
    if (GetDataNode()->GetFloatProperty("volumerendering.ray.diffuse", value, renderer))
      ls->m_VolumePropertyRAY->SetDiffuse(value);
    if (GetDataNode()->GetFloatProperty("volumerendering.ray.specular", value, renderer))
      ls->m_VolumePropertyRAY->SetSpecular(value);
    if (GetDataNode()->GetFloatProperty("volumerendering.ray.specular.power", value, renderer))
      ls->m_VolumePropertyRAY->SetSpecularPower(value);
  }
}

bool mitk::GPUVolumeMapper3D::IsRAYEnabled(mitk::BaseRenderer *renderer)
{
  LocalStorage *ls = m_LSH.GetLocalStorage(renderer);
  bool value = false;
  return ls->m_raySupported && GetDataNode()->GetBoolProperty("volumerendering.useray", value, renderer) && value;
}

#endif