[vtkusers] Which VTK data structure should I use for this problem?

[iontichy]

Hello,

I'm very new to the whole VTK toolkit stuff. I am trying to use it for
scientific visualization. At the moment I am trying to figure out, how to
approach the following problem in terms of data structure:

I create 2D/3D clusterings of data sets. I need to plot the 2D/3D clusters
on top of the original data set. The clusters should have distinct colors
(color staying the same for one cluster).

I am already writing out the underlying data sets as .vtr (rectilinear grid)
data. How I am thinking about how to approach the clusters themselves. Which
vtk data structures should I use? The clusters represent subsets of the
original data set, but are often very small.

The clusters are significantly smaller than the whole data set.  Can I use
the rectilinear grid format again, only writing out  a subset of points? Or
will this approach force me to provide all points for the grid, regardless
of how many are actually used? 

The other route I was considering was to use vtkQuad / vtkVoxel (for 2D/3D
respectively). I mostly understand how to create the data structures, but
how would I assign them a property for coloring? 

The other concern is to write some kind of format that Visit can visualize
without much trouble. 

I would be grateful for any advise in this matter. VTK can be a little
confusing/intimidating at first. Thanks!



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