# Angle planes issue

**URL:** <https://discourse.slicer.org/t/angle-planes-issue/13471>\
**Category:** Support\
**Tags:** extensions-manager\
**Created:** [September 13, 2020, 4:59pm UTC](https://discourse.slicer.org/t/angle-planes-issue/13471 "2020-09-13T16:59:25Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Malick](https://avatars.discourse-cdn.com/v4/letter/m/a3d4f5/32.png) [@Malick](https://discourse.slicer.org/u/Malick)\
**Post date:** [September 13, 2020, 4:59pm UTC](https://discourse.slicer.org/t/angle-planes-issue/13471/1 "2020-09-13T16:59:25Z")

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Operating system: Win 10  
Slicer version: 4.10.2  
Expected behavior: Angles measurements  
Actual behavior: Impossible to create a new plane

Python error line  
Traceback (most recent call last):  
File “C:/Users/Malick/AppData/Roaming/NA-MIC/Extensions-28257/AnglePlanesExtension/lib/Slicer-4.10/qt-scripted-modules/AnglePlanes.py”, line 244, in onLandmarksChanged  
onSurface)  
File “C:/Users/Malick/AppData/Roaming/NA-MIC/Extensions-28257/AnglePlanesExtension/lib/Slicer-4.10/qt-scripted-modules/AnglePlanes.py”, line 999, in connectLandmarks  
PointAddedEventTag = landmarks.AddObserver(landmarks.PointAddedEvent, self.onPointAddedEvent)  
AttributeError: ‘vtkSlicerMarkupsModuleMRMLPython.vtkMRMLMarkupsFid’ object has no attribute ‘PointAddedEvent’

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**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [September 13, 2020, 5:57pm UTC](https://discourse.slicer.org/t/angle-planes-issue/13471/2 "2020-09-13T17:57:02Z")

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Planes are incorporated into the Markups module. You will be better of using the latest preview.

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**Author:** ![Malick](https://avatars.discourse-cdn.com/v4/letter/m/a3d4f5/32.png) [@Malick](https://discourse.slicer.org/u/Malick)\
**Post date:** [September 13, 2020, 9:19pm UTC](https://discourse.slicer.org/t/angle-planes-issue/13471/3 "2020-09-13T21:19:28Z")

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> [@muratmaga](#):
>
> Planes are incorporated into the Markups module. You will be better of using the latest preview

Sorry, I am still stuck  
I create markups  
I’d like to connect them to create a new plane

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**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [September 13, 2020, 9:36pm UTC](https://discourse.slicer.org/t/angle-planes-issue/13471/4 "2020-09-13T21:36:18Z")

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Did you switch to Markups-\> Plane setting:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/9/8/984b482918a5ad788b806e5abae934ed87f812b2.png)

You can find more details about the Markups module, including how to interactively change planes, [here](https://github.com/SlicerMorph/S_2020/blob/master/Day_2/Markups/Markups.md):

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**Author:** ![Malick](https://avatars.discourse-cdn.com/v4/letter/m/a3d4f5/32.png) [@Malick](https://discourse.slicer.org/u/Malick)\
**Post date:** [September 13, 2020, 9:41pm UTC](https://discourse.slicer.org/t/angle-planes-issue/13471/5 "2020-09-13T21:41:04Z")

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No such option  
I use the 4.10.2 version  
I’ll upgrade

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**Author:** ![Malick](https://avatars.discourse-cdn.com/v4/letter/m/a3d4f5/32.png) [@Malick](https://discourse.slicer.org/u/Malick)\
**Post date:** [September 13, 2020, 10:58pm UTC](https://discourse.slicer.org/t/angle-planes-issue/13471/6 "2020-09-13T22:58:44Z")

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Great  
Planes created  
Final query please: how to calculate angles between planes (created ones and standard ones)

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**Author:** ![anasmh101](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/anasmh101/32/80621_2.png) [@anasmh101](https://discourse.slicer.org/u/anasmh101)\
**Post date:** [February 13, 2024, 6:15am UTC](https://discourse.slicer.org/t/angle-planes-issue/13471/7 "2024-02-13T06:15:30Z")

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hello, may I ask you if you managed to calculate angles between planes, I am having difficulty in this matter