[vtk-developers] Fwd: bug in vtkContourRepresentation ?

[NsPx]

Le mercredi 21 mars 2012 10:08:01, Karthik Krishnan a écrit :
> NsPx:
>
> Excellent insight.
>
> I had fixed in VTK a few months ago (post the VTK58 release). Please
> switch to the development version
>
> --
> karthik
>
> On Wed, Mar 21, 2012 at 1:12 PM, NsPx <nspx.roronoa at gmail.com
> <mailto:nspx.roronoa at gmail.com>> wrote:
>
>     Dear vtk developpers,
>
>     I think I felt on a bug concerning vtkContourRepresentation but
>     i'm not sure so i'm exposing the situation. Then you'll confirm me
>     or not.
>     (vtk 5.8, windows XP 32bits, visual studio 2008)
>
>     I use vtkOrientedGlyphContourRepresentation (with
>     vtkPolygonalSurfacePointPlacer and
>     vtkPolygonalSurfaceContourLineInterpolator) via vtkContourWidget
>     to draw a contour on a mesh interactively.
>
>     However when I want to close the contour, the penultimate line is
>     reset to be a simple segment.
>
>     I found the problem comes from the function : void
>     vtkContourRepresentation::UpdateLines( int index ) in this portion
>     of code :
>
>      if (this->LineInterpolator)
>         {
>         vtkIntArray *arr = vtkIntArray::New();
>         this->LineInterpolator->GetSpan( index, arr, this );
>
>         int nNodes = arr->GetNumberOfTuples();
>         for (int i = 0; i < nNodes; i++)
>           {
>           arr->GetTupleValue( i, indices );
>           this->UpdateLine( indices[0], indices[1] );
>           }
>         arr->Delete();
>         }
>
>
>     if I understand well, this function clear the path between node
>     indices[0] and indices[1] and build it again.But when
>     indices[0]=nNodes-1 and indices[1]=nNodes-2 (or vice-versa) this
>     line is only cleared.
>
>     Please someone confirm the problem.
>
>     This test can be reproduce using the example on the wiki and
>     closing a contour on the sphere :
>     http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/vtkPolygonalSurfacePointPlacer
>
>     Regards.
>
>
>
>     _______________________________________________
>     Powered by www.kitware.com <http://www.kitware.com>
>
>     Visit other Kitware open-source projects at
>     http://www.kitware.com/opensource/opensource.html
>
>     Follow this link to subscribe/unsubscribe:
>     http://www.vtk.org/mailman/listinfo/vtk-developers
>
>
>
>
>

Nice, I'll wait for the new release version. For the moment I made my 
own correction.
Thanks karthik.