[vtkusers] vtkTriangleFilter "Bug"- Just 2 Triangles share a PointID

[R T]

Hello all,
I use vtkTriangleFilter to get a triangular mesh.
when I traverse the mesh and observe the Neigboring Cells
with GetPointCells(PointID),  a few times
I am getting just 2 Cells that share
that PointID.
with Triangles it's impossible: is it a bug?
or how to rebuild the mesh/or the Cell links to guarantee at least 3 
Triangles sharing a PointID.

The pipeline is following
vtkImageData ->vtkContourFilter->
->vtkConnectivityFilter->vtkTriangleFilter->vtkPolyDataMapper

Thanks in advance.
--Roma

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