[vtkusers] Re : Enable/Disable Offscreen rendering

[Julien Finet]

I haven't spent time investigating. However, I wonder if playing with the
following flags could make a difference:
 - Qt::WA_PaintOnScreen
 - Qt::WA_OpaquePaintEvent
 - Qt::WA_NoSystemBackground
 - Qt::WA_PaintUnclipped

Julien.

On Tue, Sep 20, 2011 at 10:17 AM, Clinton Stimpson <clinton at elemtech.com>wrote:

> On Monday, September 19, 2011 11:30:58 pm Julien Finet wrote:
> > Hi,
> >
> > QPixmap::grabWidget() can fail with QGLWidgets or QVTKWidgets, especially
> > if there is another window in front of the widgets (on Ubuntu with "No
> > Effects") .
> >
> > However QGLWidget::grabFrameBuffer() / QVTKWidgets::cachedImage work
> fine.
> >
> > In CTK <http://www.commontk.org/index.php/Main_Page>, we handle that
> > problem:
> >  - ctk::grabWidget for QGLWidgets:
> >
> https://github.com/commontk/CTK/blob/master/Libs/Widgets/ctkWidgetsUtils.cp
> > p - ctk::grabVTKWidget for QVTKWidgets:
> >
> https://github.com/commontk/CTK/blob/master/Libs/Visualization/VTK/Widgets/
> > ctkVTKWidgetsUtils.cpp
>
> Do you know why this method works for you and not the code that is already
> in
> QVTKWidget::paintEvent() ?  It appears to work off the back buffer instead
> of
> the front buffer.  I thought even the back buffer on some machines had
> garbage
> with other windows in front.
>
> Clint
>
> >
> > Hth,
> > Julien.
> >
> > On Mon, Sep 19, 2011 at 10:40 AM, Clinton Stimpson
> <clinton at elemtech.com>wrote:
> > > To take a snapshot of the app, QPixmap::grabWidget() is supposed to
> work.
> > > Have you tried that?
> > > QVTKWidget will take the onscreen pixels and put it in that QPixmap,
> > > while the
> > > other QWidgets will paint themselves into the QPixmap.
> > > If you want to use offscreen, I suppose you could set the offscreen
> flag,
> > > then
> > > still call QPixmap::grabWidget().
> > >
> > > Clint
> > >
> > > On Monday, September 19, 2011 05:56:17 am Malsoaz James wrote:
> > > > I would like to take screenshots of the entire Qt window containing
> the
> > >
> > > vtk
> > >
> > > > scene. The solution with vtkWindowToImageFilter can only be used to
> > > > take screenshots of the vtk scene not for my entire user interface.
> > > >
> > > > Thus, the screenshot process is made using Qt.
> > > >
> > > >
> > > > ________________________________
> > > > De : peterm <madapeti at gmail.com>
> > > > À : vtkusers at vtk.org
> > > > Envoyé le : Lundi 19 Septembre 2011 12h13
> > > > Objet : Re: [vtkusers] Enable/Disable Offscreen rendering
> > > >
> > > > Dear James,
> > > >
> > > > vtkWindowToImageFilter can save the content of the selected render
> > >
> > > window.
> > >
> > > > Actually how else did you manage to save the window content if not
> > > > using it?
> > > >
> > > > Peter
> > > >
> > > > --
> > >
> > > > View this message in context:
> > >
> http://vtk.1045678.n5.nabble.com/Enable-Disable-Offscreen-rendering-tp481
> > > 8
> > >
> > > > 233p4818424.html Sent from the VTK - Users mailing list archive at
> > > > Nabble.com.
> > > > _______________________________________________
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> > > --
> > > Clinton Stimpson
> > > Elemental Technologies, Inc
> > > Computational Simulation Software, LLC
> > > www.csimsoft.com
> > > _______________________________________________
> > > Powered by www.kitware.com
> > >
> > > Visit other Kitware open-source projects at
> > > http://www.kitware.com/opensource/opensource.html
> > >
> > > Please keep messages on-topic and check the VTK FAQ at:
> > > http://www.vtk.org/Wiki/VTK_FAQ
> > >
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>
> --
> Clinton Stimpson
> Elemental Technologies, Inc
> Computational Simulation Software, LLC
> www.csimsoft.com
>
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