vtkIdFilter *idfilter = vtkIdFilter::New();
idfilter->SetInput(m_AbstractActor->mygrid);
idfilter->PointIdsOn();
idfilter->CellIdsOn();
vtkSelectVisiblePoints *selectpoint = vtkSelectVisiblePoints::New();
selectpoint->SetInputConnection(idfilter->GetOutputPort());
selectpoint->SetRenderer(renderer);
vtkLabeledDataMapper *labelmapper = vtkLabeledDataMapper::New();
labelmapper->SetInputConnection(selectpoint->GetOutputPort());
labelmapper->SetLabelFormat("%g");
labelmapper->GetLabelTextProperty()->SetFontSize(10);
labelmapper->GetLabelTextProperty()->SetColor(1.0,0.0,0.0);
vtkActor2D *dd = vtkActor2D::New();
dd->SetMapper(labelmapper);
renderer->AddActor2D(dd);