[vtkusers] QVTKWidget design question

[Steve M. Robbins]

Hello,

While reading through the code for QVTKWidget, I noticed that the
widget contains a vtkRenderWindow object for drawing.  However the
QVTKWidget's paintEvent() method obtains the vtkRenderWindowInteractor
and calls Render() on it, rather than directly using
vtkRenderWindow::Render().  The documentation for
vtkRenderWindowInteractor::Render() says:

  Render the scene. Just pass the render call on to the associated
  vtkRenderWindow.

  http://www.vtk.org/doc/nightly/html/classvtkRenderWindowInteractor.html#3213ceb69794244133169493e89b39e6

So what is the advantage of using the interactor rather than the
render window?


Thanks,
-Steve

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