Oops... it seems that I understand now some weird "bad extent"
happening... I will keep this thread bookmarked, since it teaches a lot
about VTK pipelining!<br>
<br>
This made me look at the documentation of ShallowCopy/DeepCopy. Finally, I found this class:<br>
<a href="http://www.vtk.org/doc/nightly/html/classvtkCell.html#a573202e8c9c3b5367b35fe7ad3fdfb43">http://www.vtk.org/doc/nightly/html/classvtkCell.html#a573202e8c9c3b5367b35fe7ad3fdfb43</a><br>
<br>
where it is said that ShallowCopy is for read-only copy... Is the code snippet right? ShallowCopying the output of the internal filter should then produce a read-only output for the main filter!<br><br>Do I mistake if I rather propose:<br>
inputCopy->ShallowCopy(input);<br>
blend->AddInput(inputCopy);<br>
blend->Update();<br>
output->DeepCopy(blend->GetOutput());<br><br>Jerome<br><br><div class="gmail_quote">2009/12/15 Michael Jackson <span dir="ltr"><<a href="mailto:mike.jackson@bluequartz.net">mike.jackson@bluequartz.net</a>></span><br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="im"><br>
<br>
On Dec 15, 2009, at 11:53 AM, Bill Lorensen wrote:<br>
<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
After seeing Berk's reply it looks as though his<br>
vtkImageData* inputCopy = input->NewInstance();<br>
inputCopy->ShallowCopy(input);<br>
blend->AddInput(inputCopy);<br>
blend->Update();<br>
output->ShallowCopy(blend->GetOutput());<br>
<br>
would be:<br>
<br>
blend->AddInput(input);<br>
blend->Update()<br>
this->GraftOutput(blend->GetOutput());<br>
</blockquote>
<br></div>
Bill,<br>
As, Berk explained, you _really_ need to have a shallow copy to decouple the internal and external pipelines. If this is not done the all sorts of "Bad" will happen.<br>
<br>
Maybe what is needed is this:<br>
<br>
/* Get a Shallow copy from the input */<br>
vtkImageData* inputCopy = input->NewShallowCopyInstance();<div class="im"><br>
blend->AddInput(inputCopy);<br>
blend->Update();<br>
output->ShallowCopy(blend->GetOutput());<br></div>
/* Don't Forget to memory clean up somewhere.*/<br>
<br>
_________________________________________________________<br>
Mike Jackson <a href="mailto:mike.jackson@bluequartz.net" target="_blank">mike.jackson@bluequartz.net</a><br>
BlueQuartz Software <a href="http://www.bluequartz.net" target="_blank">www.bluequartz.net</a><br>
Principal Software Engineer Dayton, Ohio<div><div></div><div class="h5"><br>
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