[vtkusers] contouring point data

Luca Pallozzi Lavorante lplavorante at gmail.com
Thu Jul 26 12:48:05 EDT 2007

would it be interesting to you performing a Delaunay Triangulation on the
points prior to contouring?



On 7/26/07, Erik Anderson <eranders at sci.utah.edu> wrote:
> Hi all,
>      I have been trying to get iso-contours generated for
> point data for a while now with no luck.  Any help anyone
> can give would be much appreciated.  Below is a more
> complete description of the problem:
> I have a vtkUnstructuredGrid that is storing point data.
> In other words, every vertex in the dataset is a discrete
> point to be rendered.  Each point has several data arrays
> associated with it to be used for coloring, scaling, etc
> operations during glyph rendering.  I now want to generate
> isosurfaces for these data, but I cannot figure out how to
> do something like this from within VTK.
> One method that I can loosely translate into VTK language
> (but which I've had no success getting a pipeline working
> with) would be as follows:
> embed the point set in a structured grid
> for each vertex in the grid:
>     evaluate an implicit function (meta-ball like
> function)
> apply marching cubes or other isosurface extraction
> technique
> render surface
> The problem with the above approach is that I have been
> unable to construct a pipeline that would evaluate a
> function taking input from each point in the dataset.
> Any help would be greatly appreciated!
> Thank you,
> Erik Anderson
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