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<p class=MsoNormal><font size=2 face=Arial><span lang=DE style='font-size:10.0pt;
font-family:Arial'>Hello,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=DE 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 want to crop a volumedataset with vtkImageStencil which
works as it should, but it does it only to its output. (I know filters work
like this).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Unfortunately if I want to do a second cropping it will reset
all changes (because it still uses the unmodified source) which is a normal behavior.<br>
So to use the last changes I need to copy the output of vtkImageStencil to vtkImageData
(using either shallow or deepcopy) and set it as source again, <br>
which will works with small volumes but crashes when using big Datasets (probably
32 bit limit).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>So it seems to be absolutely necessary to change the input
and output at once, in order to realize useful cropping. <br>
(I tried changing vtkImageStencil, and at least it doesn’t crash when
changing the input Ptr, but It doesn’t give me the correct output).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>So, maybe there is a better way or somebody can point out
how to modify that filter.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><br>
Regards<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><br>
Michael <o:p></o:p></span></font></p>
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