# Draw a line connecting 2 landmarks using Python

**URL:** <https://discourse.slicer.org/t/draw-a-line-connecting-2-landmarks-using-python/24291>\
**Category:** Support\
**Tags:** python\
**Created:** [July 12, 2022, 6:56pm UTC](https://discourse.slicer.org/t/draw-a-line-connecting-2-landmarks-using-python/24291 "2022-07-12T18:56:16Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![l2022](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/l2022/32/11116_2.png) [@l2022](https://discourse.slicer.org/u/l2022)\
**Post date:** [July 12, 2022, 6:56pm UTC](https://discourse.slicer.org/t/draw-a-line-connecting-2-landmarks-using-python/24291/1 "2022-07-12T18:56:16Z")

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Hi,

Could you please tell me how I can add a line in the 3D view connecting 2 specific landmarks using Python in Slicer?

Thank you

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**Author:** ![ungi](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ungi/32/78573_2.png) [@ungi](https://discourse.slicer.org/u/ungi)\
**Post date:** [July 12, 2022, 8:10pm UTC](https://discourse.slicer.org/t/draw-a-line-connecting-2-landmarks-using-python/24291/2 "2022-07-12T20:10:04Z")

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Hi, there is a line markup in Slicer that may just be what you need. You can find example code on how to program markup nodes here: [Script repository — 3D Slicer documentation](https://slicer.readthedocs.io/en/latest/developer_guide/script_repository.html#markups)  
The object type is vtkMRMLMarkupsLineNode.

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<div class="post-metadata">

**Author:** ![l2022](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/l2022/32/11116_2.png) [@l2022](https://discourse.slicer.org/u/l2022)\
**Post date:** [July 25, 2022, 12:43pm UTC](https://discourse.slicer.org/t/draw-a-line-connecting-2-landmarks-using-python/24291/3 "2022-07-25T12:43:50Z")

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Hi, thank you for your reply.

I tried to find an example that does the same I want to do but I couldn’t find it.  
Can you please tell me what I should write in Python in order to define and show a 3D line connecting 2 specific vtkMRMKMarkupsFiducialNode?

Thank you