# Problem in computing centerline

**URL:** <https://discourse.slicer.org/t/problem-in-computing-centerline/22603>\
**Category:** VMTK\
**Created:** [March 19, 2022, 10:42pm UTC](https://discourse.slicer.org/t/problem-in-computing-centerline/22603 "2022-03-19T22:42:53Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![A\_Khabarkhaan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/a_khabarkhaan/32/14722_2.png) [@A\_Khabarkhaan](https://discourse.slicer.org/u/A_Khabarkhaan)\
**Post date:** [March 19, 2022, 10:42pm UTC](https://discourse.slicer.org/t/problem-in-computing-centerline/22603/1 "2022-03-19T22:42:53Z")

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Hi  
I’m trying to create centerline of a shape (the sample cerebral aneurysm in the site and others) I face to the below warning:

Warning: in …\Common\DataModel\vtkPolyData.cxx, line 982  
vtkPolyData (0000024c243cd6b0): bulding vtk\_line 0 with only one point, but vtk\_line needs at least two points. Check the input.

I test with various input models but the results were the same!

Please guide me to resolve it.  
Thanks

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [March 19, 2022, 10:43pm UTC](https://discourse.slicer.org/t/problem-in-computing-centerline/22603/2 "2022-03-19T22:43:47Z")

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Have you tried using VMTK via 3D Slicer’s VMTK extension?

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**Author:** ![A\_Khabarkhaan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/a_khabarkhaan/32/14722_2.png) [@A\_Khabarkhaan](https://discourse.slicer.org/u/A_Khabarkhaan)\
**Post date:** [March 20, 2022, 8:40am UTC](https://discourse.slicer.org/t/problem-in-computing-centerline/22603/3 "2022-03-20T08:40:31Z")

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> [@lassoan](#):
>
> VMTK

Thank you for your response.  
No, I installed the package with name ‘VMTK-1.4.0-Python3.6-Windows-x86\_64.exe’ and used it.  
I created some screenshots from the procedure and uploaded with this message.

 ![001](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/c/2/c25997dc0b96ab3e1170b1cb0a13bf005af653f0.jpeg)  
 ![003](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/4/f/4fd925c2da6daae23a171cfe3d30e7f1e57002e6.jpeg)  
 ![004](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/3/3/334096adf9b706c81adba9b719e38a2557e727e5.jpeg)

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [March 20, 2022, 11:52am UTC](https://discourse.slicer.org/t/problem-in-computing-centerline/22603/4 "2022-03-20T11:52:26Z")

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I don’t know what is that package, but you can segment vessels and extract centerline using a convenient GUI in 3D Slicer, using VMTK extension. Short demo:

[![](https://img.youtube.com/vi/yi07mjr3JeU/maxresdefault.jpg "New vessel branch extraction module for 3D Slicer") ](https://www.youtube.com/watch?v=yi07mjr3JeU)

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<div class="post-metadata">

**Author:** ![A\_Khabarkhaan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/a_khabarkhaan/32/14722_2.png) [@A\_Khabarkhaan](https://discourse.slicer.org/u/A_Khabarkhaan)\
**Post date:** [March 21, 2022, 3:23am UTC](https://discourse.slicer.org/t/problem-in-computing-centerline/22603/5 "2022-03-21T03:23:38Z")

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> [@lassoan](#):
>
> nt GUI in 3D Slicer, using VMTK extension. Short demo:

By using 3D slicer, the problem has been solved.  
Thanks