[vtkusers] Re: vtkusers Digest, Vol 24, Issue 28

[Clinton Stimpson]

> From: "Nigel Mcfarlane" <Nigel.Mcfarlane at luton.ac.uk>
> Subject: [vtkusers] render window refresh, loss of display
> To: <vtkusers at vtk.org>
> 
> I am a newcomer to VTK, running version 5.0.0 under Visual C++ 2005, on
> WinXP.
> 
> If I use std::cin to pause or obtain input from the console window, the
> render window display loses the ability to update.  

That's because the event loop lost control to std::cin.  std::cin takes 
control and waits for only one thing, input from the console.  So the window 
can't update.

> It goes white if I 
> move the console window, and I can't get the image back.  This happens
> even if the std::cin is the first line of the program, before the render
> window is even created.  I see that a few people in the distant past
> have mentioned this problem, but what's the answer ?

Here's a possible solution which includes example code.  It puts console input 
in the event loop, so you can use the console and a vtk window at the same 
time.
http://public.kitware.com/pipermail/vtkusers/2005-June/080261.html

Clint

> 
> I also can't get a simple observer (as in the distribution example "step
> 2") to acknowledge anything except "StartEvent" (Although the trackball
> interactor example works perfectly).  Could this be related to the first
> problem ?
> 
> Thank you
> 
> Nigel McFarlane
> University of Luton