[vtkusers] vtkWindowToImageFilter - black image

[Fredrik]

Thanks for the reply Miroslav. I get an immediate Fatal Crash when I add a
renderWindow.render() line.


# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x000000012f4b8979, pid=42597, tid=54087
#
# JRE version: Java(TM) SE Runtime Environment (8.0_45-b14) (build
1.8.0_45-b14)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.45-b02 mixed mode
bsd-amd64 compressed oops)
# Problematic frame:
# C  [libvtkRenderingOpenGL.jnilib+0x179979]  vtkUpload3D<unsigned
char>::Upload(void*, unsigned char*, unsigned int*, int, long long*, int,
int*)+0x149

full crash report here: http://pastebin.com/bvfxB3er

Which is interesting, I can ask the JOGLVisPanel itself to render
flawlessly, but not the vtkRenderWindow contained therein.
I can't really make sense of the error report. If anyone could take pity on
my plight and help me I'd be most appreciative. I'm suspecting some kind of
JOGL/VTK/Mac problem. If it's any help, I'm debugging code that used to
work years ago under JDK 6 and older versions of VTK.

// Fredrik

2015-06-09 19:43 GMT+02:00 Miroslav Drahos <mdrahos at thinksurgical.com>:

> Frederik,
> you should call vtkRenderWindow::Render() before updating the pipeline.
> This is what has worked for me reliably:
>
>   VTK_CREATE(vtkWindowToImageFilter, w2i);
>   w2i->SetInput(rw);
>   w2i->ReadFrontBufferOff();
>   rw->Render();
>   w2i->Modified();  // See doc
> http://www.vtk.org/doc/nightly/html/classvtkWindowToImageFilter.html#details
>
>   VTK_CREATE(vtkPNGWriter, writer);
>   writer->SetFileName(fname.c_str());
>   writer->SetInputConnection(w2i->GetOutputPort());
>   writer->Write();
>
> where VTK_CREATE is a widely used macro:
>
> #define VTK_CREATE(type, name) vtkSmartPointer<type> name =
> vtkSmartPointer<type>::New();
>
> HTH,
> Miro
>
> ________________________________________
> From: vtkusers [vtkusers-bounces at vtk.org] On Behalf Of Fredrik [
> frejon at gmail.com]
> Sent: Tuesday, June 09, 2015 8:55 AM
> To: Scott Wittenburg
> Cc: vtkusers at public.kitware.com
> Subject: Re: [vtkusers] vtkWindowToImageFilter - black image
>
> Hi Scott, thanks for the reply. Unfortunately it didn't help. I think I
> remember some other thread with the "ShouldRerender" flag, but I think that
> mentioned it should be windowToImageFilter.ShouldRerenderOff();
> , not on. I tried both anyway, but no change
>
> All the best,
> Fredrik
>
> 2015-06-09 17:33 GMT+02:00 Scott Wittenburg <scott.wittenburg at kitware.com
> <mailto:scott.wittenburg at kitware.com>>:
> Hi Frederik,
>
>    I believe I have encountered this before.  What solved it for me was
> turning on the "ShouldRerender" flag in addition to what you have set.
> Something like:
>
> windowToImageFilter.ShouldRerenderOn();
>
> could possibly help.
>
> Cheers,
> Scott
>
>
>
> On Tue, Jun 9, 2015 at 9:02 AM, Fredrik <frejon at gmail.com<mailto:
> frejon at gmail.com>> wrote:
> Hello. There are several threads on this topic, and the few I see, the
> proposed solutions are not enough or the thread is left unresolved. see
> this:
>
> http://public.kitware.com/pipermail/vtkusers/2014-October/085358.html
> http://public.kitware.com/pipermail/vtkusers/2014-October/085294.html
>
> I still am unable to generate anything else than a black image.
> I'm on the latest VTK, under Mac OS X 10.10.  I also tried offscreen
> rendering, but no luck.
>
> Hours of googling and testing solutions have proven unsuccessful, I'd
> really appreciate if anyone could help me.
>
> here's a snippet of my code if you think it'll help
>
>         tempFile = "xyz.bmp";
>         // write to temporary bmp file
>         vtkBMPWriter writer = new vtkBMPWriter();
>         vtkWindowToImageFilter windowToImageFilter = new
> vtkWindowToImageFilter();
>         windowToImageFilter.ReadFrontBufferOff();
>         windowToImageFilter.SetMagnification(1);
>         windowToImageFilter.SetInput(renderWindow);
>         windowToImageFilter.SetInputBufferTypeToRGBA();
>         windowToImageFilter.ReadFrontBufferOff();
>
>         windowToImageFilter.Update();
>
>         windowToImageFilter.ReadFrontBufferOff();
>         writer.SetInputConnection(windowToImageFilter.GetOutputPort());
>         writer.SetFileName(tempFile);
>         writer.Write();
>
>
>
> Kind Regards, Fredrik
>
>
>
>
>
>
>
>
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