[vtk-developers] Fwd: bug in vtkContourRepresentation ?
NsPx
nspx.roronoa at gmail.com
Wed Mar 21 05:12:17 EDT 2012
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.
>
>
>
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Nice, I'll wait for the new release version. For the moment I made my
own correction.
Thanks karthik.
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