[vtkusers] vtkWindowToImageFilter

[Dominik Szczerba]

I have w2i->Modified() after write, else doesnt work.
--ds

On Tuesday 03 April 2007 19:40, you wrote:
> Hi,
>
> I'm using the source from the example page. Looks like:
>
> void CSomeClass::Screenshot(vtkRenderWindow* pRenWin)
> {
>     vtkWindowToImageFilter* w2i = vtkWindowToImageFilter::New();
>     vtkBMPWriter* writer = vtkBMPWriter::New();
>     w2i->SetInput(pRenWin);
>     w2i->Update();
>     writer->SetInputConnection(w2i->GetOutputPort());
>     writer->SetFileName("C:\\test.bmp");
>     pRenWin->Render();
>     writer->Write();
> }
>
> if the render window was doing offscreen rendering, the resulting
> image will be just black. If doing on screen rendering, the filter
> will just capture any other windows 'on top of' the render window. I
> thought this filter used to capture exactly what was in the renderer,
> regardless of what other windows were on top of it, or if it was doing
> offscreen rendering. I know if I revert back to the VTK release
> version the same code above works fine with offscreen rendering,
> probably with onscreen rendering and overlapping windows?
>
> Thanks,
> Mark
>
> On 4/3/07, Dominik Szczerba <domi at vision.ee.ethz.ch> wrote:
> > I once had a similar problem (empty screen) and if I recall properly the
> > solution was to call Modified() somewhere.
> > Dominik
> >
> > On Tuesday 03 April 2007 15:19, Mark Wyszomierski wrote:
> > > Hi,
> > >
> > > Has anyone tried using the CVS version of vtkWindowToImageFilter? It
> > > seems to produce an empty image when used. Reverting back to the
> > > 'release' version 5x of VTK, the same code that uses it produces
> > > correct results. Just wondering if anyone experienced the same thing
> > > or any ways around it,
> > >
> > > Thanks,
> > > Mark
> > > _______________________________________________
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> >
> > --
> > Dominik Szczerba, PhD
> > Computer Vision Lab CH-8092 Zurich
> > http://www.vision.ee.ethz.ch/~domi
> > _______________________________________________
> > This is the private VTK discussion list.
> > Please keep messages on-topic. Check the FAQ at:
> > http://www.vtk.org/Wiki/VTK_FAQ Follow this link to
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-- 
Dominik Szczerba, PhD
Computer Vision Lab CH-8092 Zurich
http://www.vision.ee.ethz.ch/~domi