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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi all,<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’m using a vtkContourFilter through a
vtkPolyDataNormals filter. The level of the contour filter can be changed by my
GUI. If it gets changed to a value where there is no surface (like 0), I get a
pop-up vtk error message telling me that there are “No data to generate
normals for”. I can see why that’s happening but I’m quite
happy for nothing to be drawn in this case (indeed, that’s what I want it
to do). Is there a way to disable this message? Or, is there a way for me to
check if the vtkContourFilter is producing empty output and then not try to
render things?<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'>Thanks,<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'>Dave<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 style='margin-bottom:12.0pt'><font size=1 color=navy face=Arial><span
style='font-size:8.0pt;font-family:Arial;color:navy'>David Hills<br>
Research Scientist, General Munitions<br>
<br>
QinetiQ iX<br>
Bldg Q27 Rm HT-2<br>
MoD Fort Halstead<br>
Sevenoaks<br>
Kent, TN14 7BP<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'>Tel: <o:p></o:p></span></font></p>
</td>
<td style='padding:0cm 0cm 0cm .75pt'>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'>01959 514836 <o:p></o:p></span></font></p>
</td>
</tr>
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<td style='padding:0cm 0cm 0cm 0cm'>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'>Email: <o:p></o:p></span></font></p>
</td>
<td style='padding:0cm 0cm 0cm .75pt'>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'>dahills@QinetiQ.com <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'>Fax: <o:p></o:p></span></font></p>
</td>
<td style='padding:0cm 0cm 0cm .75pt'>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'>01959 516050 <o:p></o:p></span></font></p>
</td>
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<td style='padding:0cm 0cm 0cm 0cm'>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'>Web: <o:p></o:p></span></font></p>
</td>
<td style='padding:0cm 0cm 0cm .75pt'>
<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:navy'><a href="http://www.qinetiq.com/iX"><font
face="Times New Roman"><span style='font-family:"Times New Roman"'>www.QinetiQ.com/iX</span></font></a>
<o:p></o:p></span></font></p>
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<p><font size=1 color=navy face=Arial><span style='font-size:8.0pt;font-family:
Arial;color:navy'>QinetiQ iX - Independent expertise where it matters most <o:p></o:p></span></font></p>
<p><font size=5 color="#339966" face=Webdings><span style='font-size:18.0pt;
font-family:Webdings;color:#339966'>P </span></font><i><font size=1
color="#339966" face=Arial><span style='font-size:8.0pt;font-family:Arial;
color:#339966;font-style:italic'>Please consider the environment before
printing this email.</span></font></i><font size=1 color="#339966" face=Arial><span
style='font-size:8.0pt;font-family:Arial;color:#339966'> </span></font><font
size=1 color=navy face=Arial><span style='font-size:8.0pt;font-family:Arial;
color:navy'><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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