# Creating a new coordinate system

**URL:** <https://discourse.slicer.org/t/creating-a-new-coordinate-system/19446>\
**Category:** Support\
**Tags:** transforms, coordinates\
**Created:** [August 31, 2021, 6:27pm UTC](https://discourse.slicer.org/t/creating-a-new-coordinate-system/19446 "2021-08-31T18:27:37Z")\
**Posts on this page:** 1\
**Showing post:** 27

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**Author:** ![GL1984](https://avatars.discourse-cdn.com/v4/letter/g/ecae2f/32.png) [@GL1984](https://discourse.slicer.org/u/GL1984)\
**Post date:** [July 21, 2022, 1:50pm UTC](https://discourse.slicer.org/t/creating-a-new-coordinate-system/19446/27 "2022-07-21T13:50:45Z")

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Thanks @mau_igna_06  
I am afraid I am not sure I know how to.  
Is there a basic tutorial on the steps to run a script like this?  
I don’t want to waste your time as I have no experience at all in any scripting/coding so maybe I need to start somewhere else?

I tried to copy and paste these 2 lines in the python interactor using an empty Slicer scene, press enter and obtained a few error lines:

> > > > PlaneNode = getNode(‘P’)  
> > > > Traceback (most recent call last):  
> > > > File “”, line 1, in   
> > > > File “/Applications/Slicer.app/Contents/bin/Python/slicer/util.py”, line 1312, in getNode  
> > > > raise MRMLNodeNotFoundException(“could not find nodes in the scene by name or id ‘%s’” % (pattern if (isinstance(pattern, str)) else “”))  
> > > > slicer.util.MRMLNodeNotFoundException: could not find nodes in the scene by name or id ‘P’  
> > > > PlaneNode.SetPlaneType(PlaneNode.PlaneTypePlaneFit)  
> > > > Traceback (most recent call last):  
> > > > File “”, line 1, in   
> > > > NameError: name ‘PlaneNode’ is not defined

I suspect I need a plane object in my scene maybe, which should be named P? Or is the P node the Fiducial list which is F by default in my 3D Slicer version? Do I need 3 points in the scene before I run the code or after? Will the plane appear as I place the 3 points? Is there any other prerequisite in the the scene before the script is run? Like a 3D object or a CT study?  
Very sorry if these questions are extremely basic. I completely understand if this scripting module is meant for people with basic programming skills and maybe I should stick to the modules already created.  
Guillaume

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