[vtkusers] what is the different bewteen two ways of rendering?

[Jing Li]

Hi, all,

I found two ways to render the data, but I don't know the different between
them.

(1)
renderWindowInteractor->Initialize();
renderWindowInteractor->Start();

(2)
renderWindow->Render();
renderWindowInteractor->Start();

The other compounds of the code are the same.
what is the different?

Thank you very much!
Jing Li
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