[vtkusers] about vtkDijkstraGraphGeodesicPath

Tue Oct 17 10:49:26 EDT 2017

Indeed, thanks a lot!

Frederic

Le 17/10/2017 à 16:40, Bill Lorensen a écrit :
> Should be:
> appendFilter.AddInputConnection(dijkstra.GetOutputPort())
>
> On Tue, Oct 17, 2017 at 7:30 AM, Frédéric BRIEND <briend at cyceron.fr 
> <mailto:briend at cyceron.fr>> wrote:
>
>     Thanks a lot Yoshimi.
>     However there is a problem of attibute in the script:
>
>         appendFilter.AddInputData(dijkstra.GetOutputPort())
>     AttributeError: AddInputData
>
>     Does the script works for you?
>     Best,
>
>     Frederic
>
>
>     Le 13/10/2017 à 03:26, kenichiro yoshimi a écrit :
>>     Hello Frederic,
>>
>>     The options about constrained shortest path can not be found in the
>>     vtkDijkstraGraphGeodesicPath. I don't know it is helpful or not but it
>>     is possible to add points to pass through as some of the constraints.
>>     It works in the following way due to applying vtkAppendFilter
>>     successively to some outputs of vtkDijkstraGraphGeodesicPath.
>>
>>     ---
>>     import vtk
>>     import math
>>
>>     cylinder= vtk.vtkSphereSource()
>>     cylinder.SetCenter(0.0, 0.0, 0.0)
>>     cylinder.SetRadius(0.5)
>>
>>     appendFilter = vtk.vtkAppendFilter()
>>     appendFilter.MergePointsOn()
>>
>>     vIds = [4, 12, 23, 28]
>>
>>     p0 = [0,0,0]
>>     p1 = [0,0,0]
>>     dist = 0.0
>>     for n in range(len(vIds)-1):
>>        v0 = vIds[n]
>>        v1 = vIds[n+1]
>>
>>        dijkstra = vtk.vtkDijkstraGraphGeodesicPath()
>>        dijkstra.SetInputConnection(cylinder.GetOutputPort())
>>        dijkstra.SetStartVertex(v0)
>>        dijkstra.SetEndVertex(v1)
>>        dijkstra.Update()
>>
>>        pts = dijkstra.GetOutput().GetPoints()
>>        for ptId in range(pts.GetNumberOfPoints()-1):
>>          pts.GetPoint(ptId, p0)
>>          pts.GetPoint(ptId+1, p1)
>>          print(math.sqrt(vtk.vtkMath.Distance2BetweenPoints(p0, p1)))
>>          dist += math.sqrt(vtk.vtkMath.Distance2BetweenPoints(p0, p1))
>>
>>        appendFilter.AddInputData(dijkstra.GetOutput())
>>
>>     print(dist)
>>
>>     appendFilter.Update()
>>     ---
>>
>>     Thanks
>>
>>     2017-10-13 1:26 GMT+09:00 Frédéric BRIEND<briend at cyceron.fr> <mailto:briend at cyceron.fr>:
>>>     Hi,
>>>
>>>     Always with vtkDijkstraGraphGeodesicPath function, is-it possible to
>>>     constrained the geodesic shortest paths (example)?
>>>     and thus to add points beetween the "dijkstra.SetStartVertex(X)" and the
>>>     "dijkstra.SetEndVertex(Y)"?
>>>
>>>     Thanks in advance!
>>>
>>>     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> <mailto: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?
>>>
>>>     Thanks in advance!
>>>
>>>     My python script:
>>>
>>>     cylinder= vtk.vtkSphereSource()
>>>     cylinder.SetCenter(0.0, 0.0, 0.0)
>>>     cylinder.SetRadius(0.5)
>>>
>>>     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 <mailto:briend at cyceron.fr>
>>>
>>>     http://www.ists.cyceron.fr/
>>>
>>>
>>>     _______________________________________________
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>>>     --
>>>
>>>     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 <tel:+33%202%2031%2047%2001%2056>
>>>
>>>     Email :briend at cyceron.fr <mailto:briend at cyceron.fr>
>>>
>>>     http://www.ists.cyceron.fr/
>
>     -- 
>
>     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/
>
>
>     _______________________________________________
>     Powered by www.kitware.com <http://www.kitware.com>
>
>     Visit other Kitware open-source projects at
>     http://www.kitware.com/opensource/opensource.html
>     <http://www.kitware.com/opensource/opensource.html>
>
>     Please keep messages on-topic and check the VTK FAQ at:
>     http://www.vtk.org/Wiki/VTK_FAQ <http://www.vtk.org/Wiki/VTK_FAQ>
>
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>
>
>
> -- 
> Unpaid intern in BillsBasement at noware dot com

-- 

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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