Method WidgetInteraction

Interaction/Widgets/vtk3DCursorRepresentation.cxx:143–224

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
void vtk3DCursorRepresentation::WidgetInteraction(double newEventPos[2])
{
  if (!this->Renderer)
  {
    return;
  }

  vtkCollectionSimpleIterator cookie;
  vtkActorCollection* actorcol = this->Renderer->GetActors();
  vtkActor* actor;
  std::map<vtkPolyDataMapper*, std::string> pointArrayNames;
  std::map<vtkPolyDataMapper*, std::string> cellArrayNames;

  // Iterate through mappers to disable the potential use of point/cell data
  // arrays for selection and enforce the use of cell IDs.
  // This is needed in order to prevent a mismatch between the value retrieved
  // with hardware picking and the ID of the point/cell we want to extract before
  // computing the ray intersection (see vtkHardwarePicker).
  // This typically happen in a ParaView context, where vtkOriginalPoint/CellIds
  // is generated by the vtkPVGeometryFilter of the representation and used for
  // the hardware selection by vtkPolyDataMapper.
  for (actorcol->InitTraversal(cookie); (actor = actorcol->GetNextActor(cookie));)
  {
    // the mapper can be a composite polydata mapper or a single OpenGL polydata mapper.
    if (auto cpdm = vtkCompositePolyDataMapper::SafeDownCast(actor->GetMapper()))
    {
      if (cpdm->GetPointIdArrayName())
      {
        pointArrayNames.emplace(cpdm, cpdm->GetPointIdArrayName());
        cpdm->SetPointIdArrayName(nullptr);
      }
      if (cpdm->GetCellIdArrayName())
      {
        cellArrayNames.emplace(cpdm, cpdm->GetCellIdArrayName());
        cpdm->SetCellIdArrayName(nullptr);
      }
    }
    else if (auto glMapper = vtkPolyDataMapper::SafeDownCast(actor->GetMapper()))
    {
      if (glMapper->GetPointIdArrayName())
      {
        pointArrayNames.emplace(glMapper, glMapper->GetPointIdArrayName());
        glMapper->SetPointIdArrayName(nullptr);
      }
      if (glMapper->GetCellIdArrayName())
      {
        cellArrayNames.emplace(glMapper, glMapper->GetCellIdArrayName());
        glMapper->SetCellIdArrayName(nullptr);
      }
    }
  }

  this->Internals->Picker->Pick(newEventPos[0], newEventPos[1], 0.0, this->Renderer);

  // Restore the original point and cell data arrays after picking
  for (auto item = pointArrayNames.begin(); item != pointArrayNames.end(); item++)
  {
    if (auto cpdm = vtkCompositePolyDataMapper::SafeDownCast(item->first))