[vtkusers] converting output of vtkContourFilter from line segments to closed loop polyline

David C Thompson dcthomp at sandia.gov
Thu Jun 22 17:56:36 EDT 2006

On Thu, 2006-06-22 at 15:30 -0600, Richard Strelitz wrote:
> I want to use contours (and isosurfaces) as discrete objects.  For 
> example, while vtkContourFilter generates a multitude of 2-point line 
> segment cells, I want to string together those pieces belonging to the 
> same contour to be shown as an N-point polyline.  Absent special cases 
> (hitting the boundary, duplicate points, etc.) the problem is 
> straightforward.  ...
> Is there a method or class that I have overlooked?  Wouldn't this be a 
> nice thing to have?
> Suggestions, comments, hints and even flames, welcome.

Hint: VTK/Graphics/vtkStripper does what you want. Note that it won't
create polylines with more than 100,000 segments (by fiat).


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