[vtkusers] contouring point data
eranders at sci.utah.edu
Thu Jul 26 12:42:50 EDT 2007
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
apply marching cubes or other isosurface extraction
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!
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