Method PickObject

Modules/Core/src/Rendering/mitkVtkPropRenderer.cpp:404–470

}

mitk::DataNode *mitk::VtkPropRenderer::PickObject(const Point2D &displayPosition, Point3D &worldPosition) const
{
  m_CellPicker->InitializePickList();

  // Iterate over all DataStorage objects to determine all vtkProps intended
  // for picking
  DataStorage::SetOfObjects::ConstPointer allObjects = m_DataStorage->GetAll();
  for (DataStorage::SetOfObjects::ConstIterator it = allObjects->Begin(); it != allObjects->End(); ++it)
  {
    const DataNode *node = it->Value();
    if (node == nullptr)
      continue;

    bool pickable = false;
    node->GetBoolProperty("pickable", pickable);
    if (!pickable)
      continue;

    auto *mapper = dynamic_cast<VtkMapper *>(node->GetMapper(m_MapperID));
    if (mapper == nullptr)
      continue;

    vtkProp *prop = mapper->GetVtkProp((mitk::BaseRenderer *)this);
    if (prop == nullptr)
      continue;

    m_CellPicker->AddPickList(prop);
  }

  // Do the picking and retrieve the picked vtkProp (if any)
  m_CellPicker->PickFromListOn();
  m_CellPicker->Pick(displayPosition[0], displayPosition[1], 0.0, m_VtkRenderer);
  m_CellPicker->PickFromListOff();

  mitk::FillArray(worldPosition, m_CellPicker->GetPickPosition());
  vtkProp *prop = m_CellPicker->GetViewProp();

  if (prop == nullptr)
  {
    return nullptr;
  }

  // Iterate over all DataStorage objects to determine if the retrieved
  // vtkProp is owned by any associated mapper.
  for (DataStorage::SetOfObjects::ConstIterator it = allObjects->Begin(); it != allObjects->End(); ++it)
  {
    DataNode::Pointer node = it->Value();
    if (node.IsNull())
      continue;

    mitk::Mapper *mapper = node->GetMapper(m_MapperID);
    if (mapper == nullptr)
      continue;

    auto *vtkmapper = dynamic_cast<VtkMapper *>(mapper);

    if (vtkmapper)
    {