[vtk-developers] vtkStripper bug ?

[Andras Lasso]

We use vtkStripper extensively for creating closed contours from surface mesh/image slice intersections of medical images and it works very well. It rarely fails, even for complex geometry. We just had to set MaximumLength to 10000 to avoid splitting of contours.

Andras

From: vtk-developers [mailto:vtk-developers-bounces at vtk.org] On Behalf Of Will Schroeder
Sent: February 9, 2017 8:02
To: Mathieu Westphal <mathieu.westphal at kitware.com>
Cc: VTK Developers <vtk-developers at vtk.org>
Subject: Re: [vtk-developers] vtkStripper bug ?

I do not believe that the filter makes any guarantee that segments are connected into a single polyline (i.e., an optimality condition). It's a very simple algorithm and to do that, you'd probably have to do a multi-pass, graph analysis... there are situations in the general case where polylines could meet at multiple points etc and to extract the fewest number of polylines containing the maximal number of segments is non-trivial. If you assume manifold conditions, you could simplify the algorithm, but it would then require a backward and forward tracing of connected line segments, followed by a restart of the joining algorithm. This is left as an exercise for the user :-)

On Thu, Feb 9, 2017 at 2:45 AM, Mathieu Westphal <mathieu.westphal at kitware.com<mailto:mathieu.westphal at kitware.com>> wrote:
Hi

I'm trying to have contour as polyline cells
However, somtimes the contour is separated in two parts, even though the part are definitelly connected.
It appears only when the contour is not complete though.
Is it normal ? or a bug ?
Attached is a ParaView example that demonstrate the bug.

Mathieu Westphal

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