[vtkusers] Coloring 2D surface along contourlines

[Jérôme]

Hi,

You may want to use vtkContourFilter: It implements an isoline extraction
from any type of dataset.

HTH
Jerome

2011/7/5 Deij, Menno <M.Deij at marin.nl>

>   Dear vtk-users,****
>
> ** **
>
> First a disclaimer: I’m quite new to VTK and this is my first post to the
> users list. ****
>
> ** **
>
> 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).****
>
> My first attempt was using the following pipeline:****
>
> ** **
>
> [vtkStructuredGrid with points having scalar data: elevation] -->
> [vtkStructuredGridGeometryFilter] --> [vtkPolyDataNormals] -->
> [vtkPolyDataMapper] -> [vtkActor] ****
>
> ** **
>
> But the result is quite blurred and full of ‘kinks’ between the colored
> sections (see screenshot_1.png).****
>
> ** **
>
> 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).****
>
>
> 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.****
>
> ** **
>
> Thanks and best wishes,****
>
> ** **
>
> ** **
>
> Menno****
>
> ** **
>
> PS. I hope the pictures are viewable in the list, if not I can make them
> available on request.****
>
>     dr. ir. Menno A. Deij
>
> Software Engineer
>   Maritime Simulation Group
>
>
>
> *MARIN*
>
>
>   2, Haagsteeg  E M.Deij at marin.nl P.O. Box 28 T +31 317 49 39 11  6700 AA
> Wageningen  T   The Netherlands I  www.marin.nl
>
> **
> ******
>
>
>
> MARIN news: Practical Application Viscous-flow Calculations for Simulation
> of Manoeuvring Ships<http://www.marin.nl/web/News/News-items/Practical-Application-Viscousflow-Calculations-for-Simulation-of-Manoeuvring-Ships.htm>
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