[vtkusers] explanation for four pane viewer example

[Prashanth]

All,

I'm trying to set up my code similar to the four pane viewer example and
have trouble understanding how the 3D view is displayed (on top right).

In my understanding, these 3 lines are responsible for the 3D view

vtkSmartPointer< vtkRenderer > ren = vtkSmartPointer< vtkRenderer >::New();

this->ui->view4->GetRenderWindow()->AddRenderer(ren);
vtkRenderWindowInteractor *iren = this->ui->view4->GetInteractor();

But I don't see inputs or actors to the renderer 'ren'. Can you please help
me understand how the 3D view in top right corner is being generated and
displayed?

Thanks
Prashanth
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