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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Fred,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks for your reply. Your suggestion to
force update by calling Update() makes excellent sense, but unfortunately it didn’t
seem to visibly change program behavior. However, it inspired me to try an even
more brute-force approach that did work. Since the problem was apparently that
I couldn’t get the vtkRenderLargeImage object to respond to new input
data after the 0<sup>th</sup> loop iteration, perhaps I could force the issue
by deleting the object after each iteration and creating a new one for the next.
Thus, the new object would be forced to access the new input data because it simply
wouldn’t have any previous data available. It’s crude but it does
the job, and the system resource hit for the per-loop-iteration New() and
Delete() isn’t big enough in my little app to impinge noticeably on
performance. So thanks again for kickstarting me to a solution.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>-Steve <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=3 width="100%" align=center tabindex=-1>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Frederic DANESI
[mailto:frederic.danesi@dinccs.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, April 03, 2008
3:24 AM<br>
<b><span style='font-weight:bold'>To:</span></b> 'Steve Chall'<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [vtkusers] Input
to/output from vtkRencerLaargeImage apparently not refreshing</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span lang=FR
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Hi Steve<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span lang=FR
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>I guess that the
difference is that you use the input/output scheme for bigRender and not for
WindowToImage …By the way, I suggest you to try this :<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Simply call manually
the Update() method before trying to write the bigRender :<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>
…<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sprintf(fileName,
“big%d.png”, i);<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>bigRender->Update();<o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
pngWriter->SetInput(bigRender->GetOutput());<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
pngWriter->SetFileName(fileName);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
pngWriter->Write(); //
Uh-oh: every image is just big0.png over again for all i.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>
….<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Fred.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=FR style='font-size:
10.0pt;font-family:Tahoma;font-weight:bold'>De :</span></font></b><font
size=2 face=Tahoma><span lang=FR style='font-size:10.0pt;font-family:Tahoma'>
vtkusers-bounces@vtk.org [mailto:vtkusers-bounces@vtk.org] <b><span
style='font-weight:bold'>De la part de</span></b> Steve Chall<br>
<b><span style='font-weight:bold'>Envoyé :</span></b> mercredi 2 avril
2008 23:02<br>
<b><span style='font-weight:bold'>À :</span></b> vtkusers@vtk.org<br>
<b><span style='font-weight:bold'>Cc :</span></b> 'Theresa-Marie Rhyne'<br>
<b><span style='font-weight:bold'>Objet :</span></b> [vtkusers] Input
to/output from vtkRencerLaargeImage apparently not refreshing<o:p></o:p></span></font></p>
</div>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=FR
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Fellow VTK fans,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’ve written an app that generates a sequence of
images in a loop, taking progressive slices through a sampled volume of
data. That part is working just fine using a vtkWindowToImageFilter as
input to a vtkPNGWriter. However, when I try to generate a sequence of
images alongside that first sequence, each of which is identical to its
corresponding image in the first sequence except much bigger (this second
sequence uses vtkRenderLargeImage, instead of vtkWindowToImageFilter, as an
input to vtkPNGWriter), then the 0th big image is just fine but all subsequent
big images are just the 0<sup>th</sup> image repeated over again. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’ve tried lots of variants on this scheme, like using
different objects (vtkPNGWriter, etc.) for each, and hooking them up using
SetInput(xxx->SetOutput) vs. SetInputConnection(xxx->GetOutputPort())
with no change. I’d appreciate it if someone more familiar with
vtkRenderLargeImage could look at the following – extracted from actual
code and adapted to highlight this specific problem, hopefully without fatal
typos or omissions – and tell me what might be wrong. Thanks very
much.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>-Steve<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>// …general C++/VTK setup and boilerplate above
this point<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>pngWriter = vtkPNGWriter::New();<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>windowToImageFilter = vtkWindowToImageFilter::New();<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>bigRender = vtkRenderLargeImage::New();<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>renWin = vtkRenderWindow::New();<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>ren = vtkRenderer::New();<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>char fileName[255];<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>renWin->AddRenderer(ren);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>renWin->SetSize(640, 480);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>bigRender->SetInput(ren);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>bigRender->SetMagnification(5);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>for (int i = 0; i < numSlices; i++)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>{<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>SetUpNextImage(i); // prepare
the image for rendering. This works fine for small<i>.png.<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>pngWriter->SetInput(windowToImageFilter->GetOutput());<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sprintf(fileName,
“small%d.png”, i);<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>pngWriter->SetFileName(fileName);<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>windowToImageFilter->SetInput(renWin);<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>diskRenWin->Render();<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>pngWriter->Write(); //
Beautiful: small<i>.png just as I’d expect.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-indent:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>sprintf(fileName,
“big%d.png”, i);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
pngWriter->SetInput(bigRender->GetOutput());<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
pngWriter->SetFileName(fileName);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>
pngWriter->Write(); //
Uh-oh: every image is just big0.png over again for all i.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>}<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Geneva><span style='font-size:
10.0pt;font-family:Geneva;color:black'>-Steve Chall<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Geneva><span style='font-size:
10.0pt;font-family:Geneva;color:black'> Senior Research Software Developer<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Geneva><span style='font-size:
10.0pt;font-family:Geneva;color:black'> Renaissance Computing Institute<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Geneva><span style='font-size:
10.0pt;font-family:Geneva;color:black'> Phone: 919-515-0051<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Geneva><span style='font-size:
10.0pt;font-family:Geneva;color:black'> Email: stevec@renci.org</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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