# Extension assistance - basic tools to start

**URL:** <https://discourse.slicer.org/t/extension-assistance-basic-tools-to-start/38442>\
**Category:** Development\
**Tags:** build, python, compile\
**Created:** [September 19, 2024, 11:56am UTC](https://discourse.slicer.org/t/extension-assistance-basic-tools-to-start/38442 "2024-09-19T11:56:07Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Shirly\_Someck](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/shirly_someck/32/77978_2.png) [@Shirly\_Someck](https://discourse.slicer.org/u/Shirly_Someck)\
**Post date:** [September 19, 2024, 11:56am UTC](https://discourse.slicer.org/t/extension-assistance-basic-tools-to-start/38442/1 "2024-09-19T11:56:07Z")

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I’ve started using 3D slicer, and managed to get a manual protocol for my project (probe view for DBS surgeries). It really is an amazing tool!  
Now I want to create an extension by using python, but am struggling greatly. I only need to use existing modules (not any new algorithms), but I feel that I don’t have the basic functions I need to know in order to write the wrapping code. For example:  
I want to create markup angle by user input; or I need to make sure my scanned are not “reformatted”, but I couldn’t find the orientation of the scan via GetOrientation.  
I read the Perk Lab bootcamp tutorials, I saw the tutorial videos, and looked at the script repository. Is there a page with the default basic functions (similarly to matlab)? Is there a service where I can just sit down with an expert for a couple of hours?

Thanks in advance for any answer!

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**Author:** ![jcfr](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jcfr/32/17825_2.png) [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Post date:** [September 19, 2024, 4:31pm UTC](https://discourse.slicer.org/t/extension-assistance-basic-tools-to-start/38442/2 "2024-09-19T16:31:10Z")

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> I’ve started using 3D slicer, and managed to get a manual protocol for my project (probe view for DBS surgeries). It really is an amazing tool!

Thanks for sharing your experience 🙏 ✨

> I want to create markup angle by user input

The [Markups](https://slicer.readthedocs.io/en/latest/user_guide/modules/markups.html) module documentation should provide you with useful details.

> or I need to make sure my scanned are not “reformatted”

We would need to more details and possibly screenshot to better understand the “issue”

> I need to make sure my scanned are not “reformatted”

Without more details, reading about the “Acquisition geometry regularization” in the [DICOM](https://slicer.readthedocs.io/en/latest/user_guide/modules/dicom.html) module page may be of interested. (Panels and their use → Basic usage → DICOM module settings)

> Is there a page with the default basic functions (similarly to matlab)?

Starting with the [Developer Guide](https://slicer.readthedocs.io/en/latest/developer_guide/index.html) may be helpful,

> Is there a service where I can just sit down with an expert for a couple of hours?

See [https://www.slicer.org/commercial-use.html](https://www.slicer.org/commercial-use.html)

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<div class="post-metadata">

**Author:** ![Shirly\_Someck](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/shirly_someck/32/77978_2.png) [@Shirly\_Someck](https://discourse.slicer.org/u/Shirly_Someck)\
**Post date:** [September 19, 2024, 5:47pm UTC](https://discourse.slicer.org/t/extension-assistance-basic-tools-to-start/38442/3 "2024-09-19T17:47:13Z")

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First, thank you for your answer.

Regarding the markups, I figured out how to do it manually, but I can’t seem to make a button to add an angle markup in my extension. I looked in the [developer guide](https://slicer.readthedocs.io/en/latest/developer_guide/slicer.html) but couldn’t find it…

What I meant in regard to reformatted files, is that when I load my DICOM I sometimes get the slices in “reformat” orientation, and not the canonical (axial/coronal/sagittal):  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/a/f/af494e65ac380fa70a079c85c366a2ee40e44cdd.png)  
and I would like that in my extension the orientation will be automatically changed to the canonical (in each slice view, i.e. red, green and yellow).

I will search in the developer guide and the forum for my other questions, thanks!