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<p class=MsoNormal><font size=2 face=Arial><span 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 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 believe I found a bug in vtkWindowedSincPolyDataFilter.
The filter appears to slightly translate the data on larger datasets ~=
50,000. I ran it with the following code on several data sets,<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-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=black><span style='color:black'>vtkWindowedSincPolyDataFilter</span></font>
* <font color=black><span style='color:black'>smoother</span></font> = <font
color=black><span style='color:black'>vtkWindowedSincPolyDataFilter</span></font>::<font
color=black><span style='color:black'>New</span></font>();<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=black><span style='color:black'>smoother</span></font>-><font
color=black><span style='color:black'>SetInput</span></font>(<font color=black><span
style='color:black'>map</span></font>-><font color=black><span
style='color:black'>GetInput</span></font>()); //map is a
vtkPolyDataMapper<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=black><span style='color:black'>smoother</span></font>-><font
color=black><span style='color:black'>SetNumberOfIterations</span></font>(20);<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>
<font color=black><span style='color:black'>smoother</span></font>-><font
color=black><span style='color:black'>SetPassBand</span></font>(0.1);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'> <font color=black><span
style='color:black'>smoother</span></font>-><font color=black><span
style='color:black'>Update</span></font>();<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>The shift appears to always be within -1 >=
<=1, which makes me think some kind of rounding error is
happening. While going from dataset to dataset, the shift varies; on the
same dataset, the shift appears to remain constaint allowing you to see the
movement. It is difficult to see the error unless the filter is run 5-7
times, but afterwards if you compare to the original dataset, the shift should
be obvious.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>I have <font color=navy><span style='color:navy'>uploaded
some</span></font> example files (<font color=navy><span style='color:navy'>see
below</span></font>)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>The example will show the model shifting and then do
a 360 turn to show the result. The initial model (white) is 0.5 opaque to
better demonstrate the shift.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>The files can also be found here:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'><a href="http://68.32.98.82/cone.cxx">http://68.32.98.82/cone.cxx</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'><a href="http://68.32.98.82/testP.vtk">http://68.32.98.82/testP.vtk</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>Thanks in advance,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>Jon<o:p></o:p></span></font></p>
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