Pass the output of the cutter through a vtkPolyDatConnectivity filter. You'll then need to look at the orientation of the normals of each connected component. The outer faces of the cut surface are going to be oriented in another direction.<br>
<br><br><div class="gmail_quote">On Wed, May 26, 2010 at 1:40 PM, Nicolas Sarrasin <span dir="ltr"><<a href="mailto:nsarrasin@phenix-systems.com">nsarrasin@phenix-systems.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div bgcolor="#ffffff" text="#003333">
<font size="-1"><font face="Tahoma">Hi all,<br>
<br>
I recently posted a message here : </font></font><small><a href="http://www.vtk.org/pipermail/vtkusers/2010-May/109274.html" target="_blank">http://www.vtk.org/pipermail/vtkusers/2010-May/109274.html</a></small><font size="-1"><font face="Tahoma"> but didn't received any answers. <br>
I guess I wasn't clear, here comes a simplification : <br>
<br>
I use vtkCutter to get planar slices from a stl file. From the result (
vtkCutter->GetOutput() ) I get, I would like to know the orientation
of the several contours I obtained (eg which are outter and which are
inner).<br>
<br>
As previously, as preview of my problem :
<a href="http://img514.imageshack.us/img514/6747/orientationcontours.png" target="_blank">http://img514.imageshack.us/img514/6747/orientationcontours.png</a><br>
<br>
Thanks by advance for helping me.<br>
<br>
Nicolas<br>
</font></font>
<div>-- <br>
<hr style="width: 100%; min-height: 2px;">
<table style="text-align: left; font-family: Verdana; width: 500px; min-height: 110px;" border="0" cellpadding="2" cellspacing="0">
<tbody>
<tr>
<td style="text-align: center; width: 80px; font-family: Verdana;"><a href="http://www.phenix-systems.com" target="_blank"><img style="border: 0px solid ; width: 75px; min-height: 66px;" alt="Logo Phenix Systems" src="cid:part1.03000508.02000706@phenix-systems.com"></a></td>
<td style="width: 506px; font-family: Verdana;"><small style="color: rgb(51, 102, 102);"><span style="font-weight: bold;">Nicolas
Sarrasin - Ingénieur Developpement 3D CFAO</span><br style="background-color: transparent;">
<a style="background-color: transparent; text-decoration: underline;" href="http://www.phenix-systems.com" target="_blank">Phenix systems</a><br style="background-color: transparent; font-style: italic;">
<small><span style="background-color: transparent; font-style: italic;"> Parc
Européen d'Entreprises </span><br style="background-color: transparent; font-style: italic;">
<span style="background-color: transparent; font-style: italic;">rue
Richard Wagner - 63200 Riom FRANCE </span><br style="font-style: italic;">
<span style="font-style: italic;">tel : +33 (0)4 73 33 45 85 |
fax : +33 (0)4 73 33 45 86 </span></small></small></td>
</tr>
<tr style="font-family: Verdana;">
<td colspan="2" rowspan="1" style="width: 80px;"><font color="#36a629" size="2">Pensez environnement !</font><br>
<font color="#36a629" size="1">N'imprimez ce mail que si c'est
vraiment nécessaire</font></td>
</tr>
</tbody>
</table>
<br style="font-family: Verdana;">
</div>
</div>
<br>_______________________________________________<br>
Powered by <a href="http://www.kitware.com" target="_blank">www.kitware.com</a><br>
<br>
Visit other Kitware open-source projects at <a href="http://www.kitware.com/opensource/opensource.html" target="_blank">http://www.kitware.com/opensource/opensource.html</a><br>
<br>
Please keep messages on-topic and check the VTK FAQ at: <a href="http://www.vtk.org/Wiki/VTK_FAQ" target="_blank">http://www.vtk.org/Wiki/VTK_FAQ</a><br>
<br>
Follow this link to subscribe/unsubscribe:<br>
<a href="http://www.vtk.org/mailman/listinfo/vtkusers" target="_blank">http://www.vtk.org/mailman/listinfo/vtkusers</a><br>
<br></blockquote></div><br>