Hum... Sorry I misunderstood something. I thought you have a flat grid
with scalar elevation : "vtkStructuredGrid with points having scalar
data: elevation" and you wanted to color the isolevels...<br><br>I feel
surprised by looking your first screenshot: attached is simulated
terrain in paraview. Pipeline has been built to match your data:<br>
[ Wavelet, extent=[-25,25/-50,50/0,0] ] <br>--> [ ExtractSurface ] <br>--> [ WarpByScalar -- modify the geometry according to wavelet data -- ]<br>--> [ Elevation -- Compute elevation on z axis -- ]<br>--> [ GenerateSurfaceNormals ]<br>
<br>ParaView rendering pipeline is totally based on VTK one, as well as
the previous used filters and source. You should be able to get the same
visualisation.<br><br>The aliasing that seems to bother you may be due
to the interpolation method : you can try to switch between gouraud and
flat in the actor's property. If it doesn't help and if possible, having
your data would make it easier to help you.<br>
<br>Best regards,<br>Jerome<br><br><div class="gmail_quote">2011/7/5 Deij, Menno <span dir="ltr"><<a href="mailto:M.Deij@marin.nl">M.Deij@marin.nl</a>></span><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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<p></p>
<div style="direction: ltr; font-family: Tahoma; color: rgb(0, 0, 0); font-size: 10pt;">Hi Jérôme,
<div><br>
</div>
<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>
<div><br>
</div>
<div>Best wishes,</div>
<div>Menno<br>
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<hr>
<div style="direction: ltr;"><font color="#000000" face="Tahoma" size="2"><b>From:</b> Jérôme [<a href="mailto:jerome.velut@gmail.com" target="_blank">jerome.velut@gmail.com</a>]<br>
<b>Sent:</b> Tuesday, July 05, 2011 8:37 PM<br>
<b>To:</b> Deij, Menno<br>
<b>Cc:</b> <a href="mailto:vtkusers@vtk.org" target="_blank">vtkusers@vtk.org</a><br>
<b>Subject:</b> Re: [vtkusers] Coloring 2D surface along contourlines<br>
</font><br>
</div><div><div></div><div class="h5">
<div></div>
<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>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div lang="EN-US">
<p></p>
<p></p>
<div>
<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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