   {
     if (from_scratch)
     {
        title_subframe.renderer = vtkSmartPointer<vtkRenderer>::New();
        title_subframe.renderer->SetBackground(1., 1., 1.);
        RTResetCamera(title_subframe);
        title_subframe.renderer->SetViewport(title_subframe.viewport);
        this->window->AddRenderer(title_subframe.renderer);
     }
 
     for (auto & subframe : this->subframes)
     {
       if (subframe.renderer)
       {
         subframe.renderer->Clear();
         if (!subframe.hidden)
           this->window->RemoveRenderer(subframe.renderer);
       }
       else
       {
         subframe.renderer = vtkSmartPointer<vtkRenderer>::New();
         subframe.renderer->SetBackground(1., 1., 1.);
         RTResetCamera(subframe);
       }
       subframe.renderer->SetViewport(subframe.viewport);
       this->window->AddRenderer(subframe.renderer);
       if (subframe.hidden)
         this->window->RemoveRenderer(subframe.renderer);
 
     }
   }

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