<div>David,</div><div><br></div>This example shows you how to get part of the way there:<div><br></div><div><a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/Meshes/BoundaryEdges" target="_blank" style="color:rgb(17,85,204);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">http://www.vtk.org/Wiki/VTK/Examples/Cxx/Meshes/BoundaryEdges</a></div>
<div><br></div><div>It will extract all the boundary edges, though, not just the yellow edge.</div><div><br></div><div>Hope that helps,</div><div>Cory<br><br><div class="gmail_quote">On Wed, Sep 4, 2013 at 8:06 AM, david bahn <span dir="ltr"><<a href="mailto:bahndavid2006@gmail.com" target="_blank">bahndavid2006@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi cory,<div> i have to extract polyline(shown in yellow color) as it is given in the given figure, which i am attaching with this mail</div>
<div><br></div><div><br></div><div><br></div><div><img src="cid:ii_140e8ddc7475de16" alt="Inline image 1" width="428" height="274"><br>
</div><div><br></div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Sep 4, 2013 at 1:50 PM, Cory Quammen <span dir="ltr"><<a href="mailto:cquammen@cs.unc.edu" target="_blank">cquammen@cs.unc.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">David,<br>
<br>
It would help if your questions were more specific. For instance,<br>
which polylines do you want to extract from your surface?<br>
<br>
Do you want all the edges between polygons? See<br>
<a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/Meshes/ExtractEdges" target="_blank">http://www.vtk.org/Wiki/VTK/Examples/Cxx/Meshes/ExtractEdges</a><br>
<br>
If you want to extract edges that have only one polygon on a side for<br>
instance (to give one definition of the bounds of the surface), see<br>
<a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/Meshes/BoundaryEdges" target="_blank">http://www.vtk.org/Wiki/VTK/Examples/Cxx/Meshes/BoundaryEdges</a><br>
<br>
Thanks,<br>
Cory<br>
<div><div><br>
<br>
On Wed, Sep 4, 2013 at 5:33 AM, david bahn <<a href="mailto:bahndavid2006@gmail.com" target="_blank">bahndavid2006@gmail.com</a>> wrote:<br>
> Hi,<br>
> I have to extract polylines from the surface, anybody can suggest me, how<br>
> can i do this?<br>
><br>
><br>
> David<br>
><br>
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<br>
--<br>
Cory Quammen<br>
Research Associate<br>
Department of Computer Science<br>
The University of North Carolina at Chapel Hill<br>
</font></span></blockquote></div><br></div>
</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br>Cory Quammen<div>Research Associate</div><div>Department of Computer Science</div><div>The University of North Carolina at Chapel Hill</div>
</div>