[vtkusers] QVTK resizing on Windows XP

[Lars Friedrich Lars]

No, I do not call setAutomaticImageCacheEnabled(true) in my application; this features is deactivated. Some cross-platform experiments in the past with this flag set to TRUE showed me that it does not reliably work in 100% of the cases - as you confirmed below.
I just call the related methods after resizing the widget as explained in the previous mail.
My application is basically built as standalone application and - on demand (on windows systems) - with an additional shared lib interface. The described workaround works on windows Vista / XP / 2000 for the standalone version and the shared lib interface; it also works on Ubuntu 64 bit.

lars


-------- Original-Nachricht --------
> Datum: Mon, 30 Nov 2009 08:21:04 -0700
> Von: Clinton Stimpson <clinton at elemtech.com>
> An: vtkusers at vtk.org
> Betreff: Re: [vtkusers] QVTK resizing on Windows XP

> 
> Are you calling setAutomaticImageCacheEnabled(true) to enable image 
> caching with it?
> Maybe you should avoid doing this.
> I don't know if its been found to be useful in practice as it was once 
> tried in ParaView but it didn't work too well.  Whether one has problems 
> with it is dependent on the windowing system.
> 
> Personally, I think the problem QVTKWidget's image caching tries to 
> solve, is best solved by the windowing system.  Mac OSX and some Linux 
> desktops already do it.
> 
> Clint
> 
> On 11/30/2009 08:04 AM, Lars Friedrich Lars wrote:
> > Hello,
> >
> > I just would like to report a solution to the problem outlined in the
> previous mail:
> >
> > It seems to be a pure QVTKWidget problem; after resizing the QVTKWidget
> invoking the following code-cascade works to successfully render the
> complete viewport:
> > qvtk->markCachedImageAsDirty();
> > qvtk->saveImageToCache();
> > qvtk->GetRenderWindow()->Render();
> >
> > However, it is really interesting that this problem occurs on Windows XP
> only ...
> > I must admit that it is a very special situation as the Qt-based GUI is
> implemented within a DLL and called via a Delphi-client-application. You
> can read more about the related signal/slot problems here:
> http://lists.trolltech.com/pipermail/qt-interest/2009-November/014826.html
> >
> > Maybe there are other people struggling around with similar problems who
> can take advantage of this 'solution'.
> >
> > regards,
> >
> > lars
> >
> >
> > -------- Original-Nachricht --------
> >    
> >> Datum: Mon, 23 Nov 2009 20:31:22 +0100
> >> Von: "Lars Friedrich Lars"<lars-friedrich at gmx.net>
> >> An: vtkusers at vtk.org
> >> Betreff: [vtkusers] QVTK resizing on Windows XP
> >>      
> >    
> >> Hello,
> >>
> >> I have an application which uses multiple QVTKWidgets to render
> different
> >> scenes (as shown on the attached screen shots). During run-time I can
> >> resize the widgets' size with the help of splitters. Normally a
> VTK-scene (the
> >> vtkRenderWindow ...) immediately adapts to the QVTKWidget's size. But
> on
> >> windows XP I am facing serious problems: as can be seen von the second
> screen
> >> shot, the vtkRenderWindow gets cut at the bottom.
> >>
> >> Did someone face similiar problems?
> >>
> >> It may the worth to annotate that the interactor (e.g. rotating the
> >> camera) still works in the cut area at the bottom, but the scene is not
> rendered.
> >> Furthermore, this problem solely exists on Windows XP (32 and 64 bit) -
> it
> >> works on Windows 2000 / Vista / 7. It also works in an ordinary
> executable
> >> on Windows XP, but not when my user interface is called out of a DLL.
> >>
> >> I guess there are some problems with some openGL buffers in the
> background
> >> and the device context. Are there possibilities to force the render
> window
> >> to reallocate its buffer?
> >>
> >> Can you help me, please? I am kind of desperate.
> >>
> >> regards,
> >>
> >> lars
> >>
> >> -- 
> >> GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT!
> >> Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01
> >>      
> >    
> 
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