给节点加上编号

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);