Hi,<br><br>The local orientation of the cylinder is computed from a local chart (Frenet-serret frame) along a curve, that is a topological constraint. It has to handle with curvature sign changes in order to keep a consistent meshing, thus the neighbours of a point (topology) have to be known. The reason why vtkTubeFilter derives from vtkPolyDataAlgorithm is, IMHO, that the GetLines( ) function ensures that the filter will deal with 1D topological cells.<br>
<br>It should not be too difficult to write a filter that converts an unstructured grid to a polydata in which you get the input cell's type and add polylines to the output when matching cells are found.<br><br>Jerome<br>
<br><div class="gmail_quote">2010/1/28 pablo p del castillo <span dir="ltr"><<a href="mailto:pablodecastillo@yahoo.es" target="_blank">pablodecastillo@yahoo.es</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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It seems better write scalar to create subdomains depending of the number of nodes per cell, and then with vtkThreshold select lines.<br><br>But it is strange that vtk has tools to extract edges, but not to select diferent cells based in their shape.<br>
<br>I am newbie in vtk.<br><br>Pablo<br><br>--- El <b>mié, 27/1/10, David Doria <i><<a href="mailto:daviddoria%2Bvtk@gmail.com" target="_blank">daviddoria+vtk@gmail.com</a>></i></b> escribió:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;">
<br>De: David Doria <<a href="mailto:daviddoria%2Bvtk@gmail.com" target="_blank">daviddoria+vtk@gmail.com</a>><br>Asunto: Re: [vtkusers] apply vtktubes to unstructured mesh<br>Para: <br>CC: "<a href="mailto:vtkusers@vtk.org" target="_blank">vtkusers@vtk.org</a>" <<a href="mailto:vtkusers@vtk.org" target="_blank">vtkusers@vtk.org</a>><br>
Fecha: miércoles, 27 de enero, 2010 14:05<div><div></div><div><br><br><div><div class="gmail_quote">On Wed, Jan 27, 2010 at 6:50 AM, pablo p del castillo <span dir="ltr"><<a rel="nofollow" href="http://mc/compose?to=pablodecastillo@yahoo.es" target="_blank">pablodecastillo@yahoo.es</a>></span> wrote:<br>
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Hello,<br><br>I have a unstructured mesh with triangles and lines, how can i extract lines to apply tubes.<br><br>Advanced thanks<br>
</td></tr></tbody></table><br><br></blockquote><div><br></div><div>Hmm, is there any reason why vtkTubeFilter derives from vtkPolyDataAlgorithm? It seems like if it could derive from vtkPointSetAlgorithm instead this question would be no problem.</div>
<div class="gmail_quote"><br></div><div class="gmail_quote">Pablo, if you can get your lines into a vtkPolyData, you can use this method to get tubes on your lines:</div><div class="gmail_quote"><a rel="nofollow" href="http://www.cmake.org/Wiki/VTK/Examples/TubeFilter" target="_blank">http://www.cmake.org/Wiki/VTK/Examples/TubeFilter</a></div>
<br clear="all">Thanks,<br><br><div>David</div></div>
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