[vtkusers] Different visualizations of 3D Data

[David E DeMarle]

vtkContourFilter can produce multiple isocontours via the
setnumberofContours and setValues methods.

vtkClipDataSet will produce slices.

google search them to find the doxygen, read that and then look for the
examples and tests lists to see them in use.

Let me suggest some approaches first though.

Once you've made the structured points from your data, use vtkDataSetWriter
to write that data to a file. Then open it up with ParaView and use the GUI
to create visualizations. This will get you going very quickly.

The next easiest thing to do is get a hold of python wrapped vtk and set up
your paths such that it is useable within Idle. A python IDE with tab
completion is the next easiest way I know of to learn VTK since
introspection brings all of the doxygen help for every object to your
fingertips and experimentation takes place as quickly as you can type.

good luck and welcome to VTK!

David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909


On Tue, Mar 26, 2013 at 12:05 PM, Curator <curator at gmx.de> wrote:

> Hi all,
>
> I'm kind of new to the data visualization of complex 3D data. Up to now, I
> only used simple shapes as cubes and spheres etc., which worked perfectly.
> However, now I am running into visualizing my simulation results, which is
> simply a three dimensional, equally distanced grid with single numeric
> values at each grid point.
>
> So far, I managed to a plot multiple iso surfaces by storing the data in a
> vtkFloatArray und aligning them by vtkStructuredPoints. Furthermore, I used
> the vtkContourFilter.
>
> Now, from the same data, I would like to add variable data slices in the
> xy, yz, and xz plane. Also, I think my implementation of a (single) iso
> surface is not efficient, because I generate the values for the contour
> filter by setting identical maximum and minimum values.
>
> In general, I am interested in a visualization like in
> http://vis.lbl.gov/Research/**ChomboVis99/vtk-initial.html<http://vis.lbl.gov/Research/ChomboVis99/vtk-initial.html>,
> but there I do not find further information.
>
> So,
>
> 1) Is it clever to store my data in a vtkFloatArray and align them by
> vtkStructuredPoints?
> 2) Is a vtkContourFilter the right tool show _one_ isosurface for a
> specified value?
> 3) Which Filter should be used for the data slices?
> 4) Which Filter do I have to use for something like
> http://vis.lbl.gov/Research/**ChomboVis99/misc-art/vtk-**volume.gif<http://vis.lbl.gov/Research/ChomboVis99/misc-art/vtk-volume.gif>?
>
> Thank you for any help,
>
> regards,
> curator
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