[vtkusers] problem with vtkDijkstraGraphGeodesicPath() and vtkXMLPolyDataReader output

[RimAY]

Dear All ,

I try to get the shortest path  between two cell in a vtk image, then trace
it with vtkTubeFilter(). I read the vtk file and get the output of the
vtkXMLPolyDataReader(). then I choose two cell: start_point and end_point to
find the shortest path  between them. My problem is that I got always the
error:

vtkTubeFilter (0F432C08): Less than two points in line! or 

I use the same code with the vtkSphereSource output and it work.
this is a part of my code:

readerVTK = vtkXMLPolyDataReader()
readerVTK.SetFileName("file")
readerVTK.Update()

data = vtkPolyData()
data = readerVTK.GetOutput()
data.Update()

geodesic = vtk.vtkDijkstraGraphGeodesicPath()
geodesic.SetInput(data)
geodesic.SetStartVertex( start_point )
geodesic.SetEndVertex( end_point )
geodesic.Update()
        
points = vtkPolyData()
points = geodesic.GetOutput()

tube = vtk.vtkTubeFilter()
tube.SetInput(points)
tube.SetRadius(1.5)
tube.Update()

tubeMapper = vtkPolyDataMapper()
tubeMapper.SetInputConnection(tube.GetOutputPort())


Any help will be very appreciated
Best Regards





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