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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hi Jérôme,
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<div>I've tried using vtkContourFilter, but that does not help with the coloring on the polygonal data set. It only extracts the isolines, which can be added to the scene using a separate vtkActor (optionally with a vtkTubeFilter to enhance the isoline 'width'). </div>
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<div>Best wishes,</div>
<div>Menno<br>
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<div id="divRpF259952" style="direction: ltr; "><font face="Tahoma" size="2" color="#000000"><b>From:</b> Jérôme [jerome.velut@gmail.com]<br>
<b>Sent:</b> Tuesday, July 05, 2011 8:37 PM<br>
<b>To:</b> Deij, Menno<br>
<b>Cc:</b> vtkusers@vtk.org<br>
<b>Subject:</b> Re: [vtkusers] Coloring 2D surface along contourlines<br>
</font><br>
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<div>Hi,<br>
<br>
You may want to use vtkContourFilter: It implements an isoline extraction from any type of dataset.<br>
<br>
HTH<br>
Jerome<br>
<br>
<div class="gmail_quote">2011/7/5 Deij, Menno <span dir="ltr"><<a href="mailto:M.Deij@marin.nl" target="_blank">M.Deij@marin.nl</a>></span><br>
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<p class="MsoNormal">Dear vtk-users,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">First a disclaimer: I’m quite new to VTK and this is my first post to the users list.
<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I’m trying to do the following: read in a list of 3D-coordinates representing a wavy surface as a vtkStructuredGrid, color it according to the elevation and show it. The structured grid has dimensions i=50, j=100, k=1 (note that k=1, the
surface is made up of polygons).<u></u><u></u></p>
<p class="MsoNormal">My first attempt was using the following pipeline:<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">[vtkStructuredGrid with points having scalar data: elevation] --> [vtkStructuredGridGeometryFilter] --> [vtkPolyDataNormals] --> [vtkPolyDataMapper] -> [vtkActor]
<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">But the result is quite blurred and full of ‘kinks’ between the colored sections (see screenshot_1.png).<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">What I want to achieve is something that has smooth/crisp lines along the contourlines, similar to screenshot_2.png. Here the colors change depending on constant elevation. I achieved this picture by cutting the wavy surface using vtkClipPolyData
at 10 different elevations and creating 10 different actors for this (for more clarity see screenshot_3.png).<u></u><u></u></p>
<p class="MsoNormal"><br>
My question is: is there a more simple way to achieve the smooth/crisp lines along contourlines, or is clipping multiple times the only solution? I’ve been trying to do something with vtkMarchingSquares, but this does not act on vtkPolyData only on vtkImageData.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thanks and best wishes,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Menno<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">PS. I hope the pictures are viewable in the list, if not I can make them available on request.<u></u><u></u></p>
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<p><font face="Arial"><font face="Arial" size="2"><font color="#7d7d7d">dr. ir. Menno A. Deij</font></font></font></p>
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<p><span style="font-size:10pt"><font face="Arial"><font color="#7d7d7d"></font><span style="color:rgb(125,125,125)">Software Engineer</span></font></span></p>
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