# How to draw a simple line with vtkMRMLMarkupsLineNode?
**URL:** https://discourse.slicer.org/t/how-to-draw-a-simple-line-with-vtkmrmlmarkupslinenode/18820
**Category:** Development
**Tags:** python, markups
**Created:** [July 20, 2021, 1:04pm UTC](https://discourse.slicer.org/t/how-to-draw-a-simple-line-with-vtkmrmlmarkupslinenode/18820 "2021-07-20T13:04:43Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Guillaume](https://discourse.slicer.org/u/Guillaume)
#### Post date: [July 20, 2021, 1:04pm UTC](https://discourse.slicer.org/t/how-to-draw-a-simple-line-with-vtkmrmlmarkupslinenode/18820/1 "2021-07-20T13:04:44Z")
Hello,
I have not found how to make a simple line going from point P1 to point P2. with vtkMRMLMarkupsLineNode … I’m still on Slicer 4.11.
Could you help me?
Thank you !!
---
### Author:  [@Mik](https://discourse.slicer.org/u/Mik)
#### Post date: [July 20, 2021, 2:23pm UTC](https://discourse.slicer.org/t/how-to-draw-a-simple-line-with-vtkmrmlmarkupslinenode/18820/2 "2021-07-20T14:23:42Z")
Something like
```auto
# Create line node
line = slicer.mrmlScene.AddNewNodeByClass( 'vtkMRMLMarkupsLineNode', 'TestLine')
# First point
pBegin = vtk.vtkVector3d( 0, 0, 0)
# Second point
pEnd = vtk.vtkVector3d( 100, 100, 100)
# Add points
line.AddControlPointWorld(pBegin)
line.AddControlPointWorld(pEnd)
```
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### Author:  [@Guillaume](https://discourse.slicer.org/u/Guillaume)
#### Post date: [July 20, 2021, 2:45pm UTC](https://discourse.slicer.org/t/how-to-draw-a-simple-line-with-vtkmrmlmarkupslinenode/18820/3 "2021-07-20T14:45:48Z")
Thank you for your help.
But, it doesn’t work … The row doesn’t even append in the data.
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### Author:  [@Mik](https://discourse.slicer.org/u/Mik)
#### Post date: [July 20, 2021, 2:58pm UTC](https://discourse.slicer.org/t/how-to-draw-a-simple-line-with-vtkmrmlmarkupslinenode/18820/4 "2021-07-20T14:58:54Z")
I have tested with version [4.11](https://download.slicer.org/) from site page and it works without problems, and node is shown in subject hierarchy correctly.
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### Author:  [@Mik](https://discourse.slicer.org/u/Mik)
#### Post date: [July 20, 2021, 3:10pm UTC](https://discourse.slicer.org/t/how-to-draw-a-simple-line-with-vtkmrmlmarkupslinenode/18820/5 "2021-07-20T15:10:46Z")
Make sure that every line of code is executed correctly.
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### Author:  [@Guillaume](https://discourse.slicer.org/u/Guillaume)
#### Post date: [July 20, 2021, 3:19pm UTC](https://discourse.slicer.org/t/how-to-draw-a-simple-line-with-vtkmrmlmarkupslinenode/18820/6 "2021-07-20T15:19:33Z")
yesss… 😭 I find the problème… I totally forgot to call the function… Sorry 😭 And thank you !