Frédéric BRIEND briend at cyceron.fr
Thu Oct 12 12:26:53 EDT 2017

```Hi,

Always with vtkDijkstraGraphGeodesicPath function, is-it possible to
constrained the geodesic shortest paths (example
<http://www.ziegelmann.info/Mark%20Ziegelmann-Dateien/Constrained%20geodesic%20shortest%20paths.htm>)?
and thus to add points beetween the "dijkstra.SetStartVertex(X)" and the
"dijkstra.SetEndVertex(Y)"?

Frederic

Le 12/10/2017 à 04:52, kenichiro yoshimi a écrit :
> Hi,
>
> The vtkDijkstraGraphGeodesicPath filter seems to output a sorted point
> set along the geodesic path. Hence, a straightforward way of getting
> the distance is summing the lengths of each segment that makes up it.
> ---
> pts = dijkstra.GetOutput().GetPoints()
>
> p0 = [0,0,0]
> p1 = [0,0,0]
> dist = 0.0
> for ptId in range(pts.GetNumberOfPoints()-1):
>    pts.GetPoint(ptId, p0)
>    pts.GetPoint(ptId+1, p1)
>    dist += math.sqrt(vtk.vtkMath.Distance2BetweenPoints(p0, p1))
>
> print(dist)
> ---
>
> Regards
>
> 2017-10-12 2:12 GMT+09:00 Frédéric BRIEND <briend at cyceron.fr>:
>> Hi,
>>
>> Sorry for the double post.
>> Since the old post of Karthik, is there a way with
>> "vtkDijkstraGraphGeodesicPath" to have the distance by GetGeodesicLength() ?
>> How to do otherwise?
>>
>>
>> My python script:
>>
>> cylinder= vtk.vtkSphereSource()
>> cylinder.SetCenter(0.0, 0.0, 0.0)
>>
>> dijkstra = vtk.vtkDijkstraGraphGeodesicPath()
>> dijkstra.SetInputConnection(cylinder.GetOutputPort())
>> dijkstra.SetStartVertex(4)
>> dijkstra.SetEndVertex(28)
>> dijkstra.Update()
>>
>> weights = vtk.vtkDoubleArray()
>> size=dijkstra.GetCumulativeWeights(weights)
>>
>> print size
>>
>> I obtain for size: none
>>
>> --
>>
>> Frederic Briend
>>
>> PhD Candidate
>>
>> Université de Caen Normandie
>>
>> Laboratoire Imagerie et Stratégies Thérapeutiques de la Schizophrénie (ISTS,
>> EA 7466)
>>
>> GIP CYCERON, Caen 14000, France
>>
>> Tel +33 2 31 47 01 56
>>
>> Email : briend at cyceron.fr
>>
>> http://www.ists.cyceron.fr/
>>
>>
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--

FredericBriend

PhD Candidate

Université de Caen Normandie

Laboratoire Imagerie et Stratégies Thérapeutiques de la Schizophrénie
(ISTS, EA 7466)

GIP CYCERON, Caen 14000, France

Tel +33 2 31 47 01 56

Email : briend at cyceron.fr <http://www.ists.cyceron.fr/>

http://www.ists.cyceron.fr/

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