# Development

**URL:** https://discourse.slicer.org/c/dev/5.md?no_subcategories=false&page=84

[Latest](https://discourse.slicer.org/latest.md) · [Categories](https://discourse.slicer.org/categories.md) · [Tags](https://discourse.slicer.org/tags.md)

**Page:** 85

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## [Reloading a loadable module](https://discourse.slicer.org/t/reloading-a-loadable-module/14212)

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**Author:** [@Anish\_Basnet](https://discourse.slicer.org/u/Anish_Basnet)\
**Replies:** 5\
**Last updated:** [November 5, 2020, 9:37am UTC](https://discourse.slicer.org/t/reloading-a-loadable-module/14212 "2020-11-05T09:37:08Z")

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Hello everyone, I’d like to know if a C++ loadable module can be loaded new without restarting the 3D slicer. I’d like to do it by clicking a PushButton in my moduleWidgetGUI.

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## [Get SliceWidget / SliceNode Coordinate From RAS or IJK](https://discourse.slicer.org/t/get-slicewidget-slicenode-coordinate-from-ras-or-ijk/14405)

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**Author:** [@EricM](https://discourse.slicer.org/u/EricM)\
**Replies:** 2\
**Last updated:** [November 3, 2020, 6:35pm UTC](https://discourse.slicer.org/t/get-slicewidget-slicenode-coordinate-from-ras-or-ijk/14405 "2020-11-03T18:35:36Z")

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Hello, I am trying to find the relationship between the coordinates used in the SliceWidgets / SliceNodes (Red, Yellow, Green) and the RAS or Voxel coordinates of a volumeNode. Everytime I load a 3D image into Slicer, …

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## [Custom slicer extension](https://discourse.slicer.org/t/custom-slicer-extension/14402)

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**Author:** [@ond12](https://discourse.slicer.org/u/ond12)\
**Replies:** 1\
**Last updated:** [November 3, 2020, 2:45pm UTC](https://discourse.slicer.org/t/custom-slicer-extension/14402 "2020-11-03T14:45:37Z")

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Hello slicer community First of all I’m a noob in slicer dev. I started searching for documentations about development of slicer modules. 2 . I built my own module and try to understand the code… but here i’m now stu…

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## [3D slicer hangs or taking longer time to perform single operation](https://discourse.slicer.org/t/3d-slicer-hangs-or-taking-longer-time-to-perform-single-operation/9681)

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**Author:** [@Ramya\_C](https://discourse.slicer.org/u/Ramya_C)\
**Replies:** 5\
**Last updated:** [November 2, 2020, 5:23pm UTC](https://discourse.slicer.org/t/3d-slicer-hangs-or-taking-longer-time-to-perform-single-operation/9681 "2020-11-02T17:23:06Z")

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Operating system: windows 10 Slicer version: 4.8.1 Expected behavior: Actual behavior: I am using 3D slicer for segmentation and modelling. The slicer file takes longer time to open and to perform any operation. My f…

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## [Using Slicer via web service API](https://discourse.slicer.org/t/using-slicer-via-web-service-api/14368)

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**Author:** [@puia](https://discourse.slicer.org/u/puia)\
**Replies:** 2\
**Last updated:** [November 1, 2020, 7:27pm UTC](https://discourse.slicer.org/t/using-slicer-via-web-service-api/14368 "2020-11-01T19:27:26Z")

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hello i am new to this software and my research is under going and i and the end i found what i need here . a stack of 2d images out of a 3d stl image . i am implementing an web app in order to work with 3d stl file ,…

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## [Masking settings from a script on a segment editor effect in python](https://discourse.slicer.org/t/masking-settings-from-a-script-on-a-segment-editor-effect-in-python/14323)

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**Author:** [@rbumm](https://discourse.slicer.org/u/rbumm)\
**Replies:** 6\
**Last updated:** [October 31, 2020, 4:00pm UTC](https://discourse.slicer.org/t/masking-settings-from-a-script-on-a-segment-editor-effect-in-python/14323 "2020-10-31T16:00:05Z")

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Hi, I am stuck with this for several days now. Would like to evaluate regions in a CT via a python script. Created a module, works ok. Four regions should be evaluated in my script, which principally works due to the…

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## [Build slicer stable release from the source on ArchLinux](https://discourse.slicer.org/t/build-slicer-stable-release-from-the-source-on-archlinux/14236)

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**Author:** [@ButuiHu](https://discourse.slicer.org/u/ButuiHu)\
**Replies:** 6\
**Last updated:** [October 31, 2020, 3:21am UTC](https://discourse.slicer.org/t/build-slicer-stable-release-from-the-source-on-archlinux/14236 "2020-10-31T03:21:45Z")

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Following the build instruction, I could now build 3dslicer 4.11.20200930 from the source in ArchLinux. The PKGBUILD file used to create an ArchLinux package is available here. Here are some tips if you would like to bui…

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## [Grid transform Set-/GetIJKToRASMatrix](https://discourse.slicer.org/t/grid-transform-set-getijktorasmatrix/14330)

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**Author:** [@mangotee](https://discourse.slicer.org/u/mangotee)\
**Replies:** 1\
**Last updated:** [October 30, 2020, 4:45pm UTC](https://discourse.slicer.org/t/grid-transform-set-getijktorasmatrix/14330 "2020-10-30T16:45:08Z")

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Hi, I am playing around with Airlab (a nice toolkit and research environment for autograd/pytorch based deformable registration). With Airlab it is possible to non-linearly register two volumes, and save the computed de…

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## [Slice view not showing images?](https://discourse.slicer.org/t/slice-view-not-showing-images/14309)

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**Author:** [@adamrankin](https://discourse.slicer.org/u/adamrankin)\
**Replies:** 1\
**Last updated:** [October 29, 2020, 5:23pm UTC](https://discourse.slicer.org/t/slice-view-not-showing-images/14309 "2020-10-29T17:23:29Z")

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Hello, In recent Slicer builds, images are not showing up in the slice view. The data probe shows correct pixel data, but the slice view is all black. Has anyone else experienced this? Adam

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## [Performance Issue](https://discourse.slicer.org/t/performance-issue/14278)

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**Author:** [@jrl](https://discourse.slicer.org/u/jrl)\
**Replies:** 4\
**Last updated:** [October 28, 2020, 9:00pm UTC](https://discourse.slicer.org/t/performance-issue/14278 "2020-10-28T21:00:15Z")

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I have a python module that is taking in a volume and outputting a new volume. There’s millions of operations that are being done, which I think is the root cause of the performance issue I am having. Furthermore, when I…

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## [Unit tests for command line and loadable modules](https://discourse.slicer.org/t/unit-tests-for-command-line-and-loadable-modules/14265)

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**Author:** [@Mik](https://discourse.slicer.org/u/Mik)\
**Replies:** 0\
**Last updated:** [October 27, 2020, 8:06am UTC](https://discourse.slicer.org/t/unit-tests-for-command-line-and-loadable-modules/14265 "2020-10-27T08:06:04Z")

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Couple of questions about testing: Are there any unit tests recommendations for command line interface and loadable modules? How to use Slicer test data (md5 checksum file), if command line module needs CT data as an i…

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## [How to convert segmentation to stl](https://discourse.slicer.org/t/how-to-convert-segmentation-to-stl/14244)

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**Author:** [@aldoSanchez](https://discourse.slicer.org/u/aldoSanchez)\
**Replies:** 0\
**Last updated:** [October 25, 2020, 10:03pm UTC](https://discourse.slicer.org/t/how-to-convert-segmentation-to-stl/14244 "2020-10-25T22:03:46Z")

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hi what I’m trying to do is to use this conversion by code: ExportSegmentsClosedSurfaceRepresentationToStlFiles but I just don’t understand how. I also want to mersh the segmentations like in the img.

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## [Need help accessing the voxel array from different frames in an imported multivolume (Python)](https://discourse.slicer.org/t/need-help-accessing-the-voxel-array-from-different-frames-in-an-imported-multivolume-python/14229)

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**Author:** [@cold-pac](https://discourse.slicer.org/u/cold-pac)\
**Replies:** 4\
**Last updated:** [October 25, 2020, 8:04am UTC](https://discourse.slicer.org/t/need-help-accessing-the-voxel-array-from-different-frames-in-an-imported-multivolume-python/14229 "2020-10-25T08:04:31Z")

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Hi everyone, I have CT Perfusion data that I can import as a ‘multivolume’ (frames separated by acquisition time). I can get the MRML node with slicer.util.getNodes(‘vtkMRMLVolumeNode’) or slicer.util.getNodes(‘vtkMRMLM…

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## [Extensions upgrade to Python3](https://discourse.slicer.org/t/extensions-upgrade-to-python3/14074)

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**Author:** [@Frederic](https://discourse.slicer.org/u/Frederic)\
**Replies:** 6\
**Last updated:** [October 25, 2020, 1:58am UTC](https://discourse.slicer.org/t/extensions-upgrade-to-python3/14074 "2020-10-25T01:58:17Z")

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Hi all, Our extension (GeodesicSlicer) does not work in the last version of Slicer (4.11.20200903) because it needs to be ported for python3. I have to do that in a couple of days (or may I have to wait the Slicer5?). …

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## [Updating modules from Slicer-4.10 to Slicer-4.11](https://discourse.slicer.org/t/updating-modules-from-slicer-4-10-to-slicer-4-11/14230)

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**Author:** [@Greydon\_Gilmore](https://discourse.slicer.org/u/Greydon_Gilmore)\
**Replies:** 12\
**Last updated:** [October 25, 2020, 1:43am UTC](https://discourse.slicer.org/t/updating-modules-from-slicer-4-10-to-slicer-4-11/14230 "2020-10-25T01:43:30Z")

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having spent some time working through our scripted modules, we failed to update slicer utility load functions to the most recent syntax. For instance, when calling slicer.util.loadMarkupsFiducialList the return is now a…

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## [LineProfile : following proportional distance PR](https://discourse.slicer.org/t/lineprofile-following-proportional-distance-pr/14219)

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**Author:** [@chir.set](https://discourse.slicer.org/u/chir.set)\
**Replies:** 1\
**Last updated:** [October 24, 2020, 1:10pm UTC](https://discourse.slicer.org/t/lineprofile-following-proportional-distance-pr/14219 "2020-10-24T13:10:25Z")

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@lassoan Following commit and merge of that PR, an inconveniant behaviour of the ‘Apply button’ appeared by introducing self.applyButton.checkBoxControlsButtonToggleState = True It seems to be a desired button behavi…

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## [Operations on segments that are not visible](https://discourse.slicer.org/t/operations-on-segments-that-are-not-visible/14161)

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**Author:** [@hherhold](https://discourse.slicer.org/u/hherhold)\
**Replies:** 2\
**Last updated:** [October 22, 2020, 12:25pm UTC](https://discourse.slicer.org/t/operations-on-segments-that-are-not-visible/14161 "2020-10-22T12:25:03Z")

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I will sometimes inadvertently hit “apply” on an editing operation with a segment that is not visible. This results in a rather long delay, followed by “undo”, to get back to where I was. Has there been any discussion a…

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## [Problème using Voilà on my slicer JupiterKernel](https://discourse.slicer.org/t/probleme-using-voila-on-my-slicer-jupiterkernel/14188)

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**Author:** [@Hugo](https://discourse.slicer.org/u/Hugo)\
**Replies:** 0\
**Last updated:** [October 21, 2020, 3:09pm UTC](https://discourse.slicer.org/t/probleme-using-voila-on-my-slicer-jupiterkernel/14188 "2020-10-21T15:09:24Z")

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Good afternoon, What is Voilà? Voilà turns Jupyter notebooks into standalone web applications. I tried opening my SliceletVideoEtienne .ipynb file that has code that run a Slicer app in the jupyterNotebook, using vo…

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## [Using observer tags](https://discourse.slicer.org/t/using-observer-tags/14041)

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**Author:** [@mms25](https://discourse.slicer.org/u/mms25)\
**Replies:** 4\
**Last updated:** [October 20, 2020, 9:59pm UTC](https://discourse.slicer.org/t/using-observer-tags/14041 "2020-10-20T21:59:56Z")

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Hi there, I am creating a module that will continually calculate the angle between two planes as one is moved. I followed the tutorial on the wiki to add an observer to the transform which is getting moved and it works …

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## [It´s possible to open vtk in another program](https://discourse.slicer.org/t/it-s-possible-to-open-vtk-in-another-program/14144)

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**Author:** [@aldoSanchez](https://discourse.slicer.org/u/aldoSanchez)\
**Replies:** 5\
**Last updated:** [October 20, 2020, 5:20pm UTC](https://discourse.slicer.org/t/it-s-possible-to-open-vtk-in-another-program/14144 "2020-10-20T17:20:21Z")

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hi I’m wondering if I can open the vtk files in another program if so which one?

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## [How to make my module available in the Extension manager?](https://discourse.slicer.org/t/how-to-make-my-module-available-in-the-extension-manager/14138)

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**Author:** [@Saima](https://discourse.slicer.org/u/Saima)\
**Replies:** 2\
**Last updated:** [October 20, 2020, 2:45am UTC](https://discourse.slicer.org/t/how-to-make-my-module-available-in-the-extension-manager/14138 "2020-10-20T02:45:38Z")

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Hi Andras, Is it possibel to rename the module name once created? I created python scripted module? I also need to put it as an extension available for my other colleages to use it? how can I put it on the cloud to be d…

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## [How to display volume node in view programatically](https://discourse.slicer.org/t/how-to-display-volume-node-in-view-programatically/14129)

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**Author:** [@rbahegne](https://discourse.slicer.org/u/rbahegne)\
**Replies:** 1\
**Last updated:** [October 19, 2020, 8:44am UTC](https://discourse.slicer.org/t/how-to-display-volume-node-in-view-programatically/14129 "2020-10-19T08:44:09Z")

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I would like to show in all view a volume node present in the subject hierarchy, just like i click on the eye. I work in a loadable module in c++. I searched for this function in Slicer sources, i found it in qSlicerSu…

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## [Proposed custom module for the extension repository](https://discourse.slicer.org/t/proposed-custom-module-for-the-extension-repository/13134)

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**Author:** [@chir.set](https://discourse.slicer.org/u/chir.set)\
**Replies:** 7\
**Last updated:** [August 25, 2020, 6:49am UTC](https://discourse.slicer.org/t/proposed-custom-module-for-the-extension-repository/13134 "2020-08-25T06:49:28Z")

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I hereby propose the Path Reformat custom scripted module for bundling in the extension repository. It is described there, repeating its objects would be superfluous in this post. I believe it may be of interest for an…

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## [Fatal Python error: Py\_Initialize: unable to load the file system codec](https://discourse.slicer.org/t/fatal-python-error-py-initialize-unable-to-load-the-file-system-codec/14115)

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**Author:** [@Warthou](https://discourse.slicer.org/u/Warthou)\
**Replies:** 1\
**Last updated:** [October 18, 2020, 3:09pm UTC](https://discourse.slicer.org/t/fatal-python-error-py-initialize-unable-to-load-the-file-system-codec/14115 "2020-10-18T15:09:10Z")

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Hello everyone, I have downloaded and built 3DSlicer. However, I am now running into these runtime errors: \[SSL\] Failed to load Slicer.crt Fatal Python error: Py\_Initialize: unable to load the file system codec Visua…

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## [Medical record integration](https://discourse.slicer.org/t/medical-record-integration/14084)

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**Author:** [@Amn3s14](https://discourse.slicer.org/u/Amn3s14)\
**Replies:** 2\
**Last updated:** [October 17, 2020, 5:37pm UTC](https://discourse.slicer.org/t/medical-record-integration/14084 "2020-10-17T17:37:57Z")

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Hello, I have written a number of tools using Slicer that aid in surgical planning and have packaged them as their own applications and focused on ease-of-use etc. in order to increase accessibility to clinicians withou…

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## [Constrain fiducials to surface](https://discourse.slicer.org/t/constrain-fiducials-to-surface/4352)

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**Author:** [@smrolfe](https://discourse.slicer.org/u/smrolfe)\
**Replies:** 27\
**Last updated:** [October 16, 2020, 10:00pm UTC](https://discourse.slicer.org/t/constrain-fiducials-to-surface/4352 "2020-10-16T22:00:48Z")

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Hello, I’m interested in making some improvements to the Markups Module, as discussed in this thread. I’m starting by looking at how to stick and slide fiducial points along a surface. I’m new to Slicer so any suggesti…

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## [Deep Vein Segmentation And 3D Reconstruction](https://discourse.slicer.org/t/deep-vein-segmentation-and-3d-reconstruction/14027)

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**Author:** [@Sedra\_Mulki](https://discourse.slicer.org/u/Sedra_Mulki)\
**Replies:** 2\
**Last updated:** [October 16, 2020, 7:09pm UTC](https://discourse.slicer.org/t/deep-vein-segmentation-and-3d-reconstruction/14027 "2020-10-16T19:09:26Z")

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Hello I am working on 3D slicer to extract deep vein in legs by using MRI images. And I used 2 way to get the result: 1- First way I apply Level set segmentation from Vascular Modeling Toolkit Model, 2- second way …

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## [Hide volume from data module](https://discourse.slicer.org/t/hide-volume-from-data-module/10218)

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**Author:** [@giovform](https://discourse.slicer.org/u/giovform)\
**Replies:** 11\
**Last updated:** [October 16, 2020, 6:43pm UTC](https://discourse.slicer.org/t/hide-volume-from-data-module/10218 "2020-10-16T18:43:14Z")

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Hello! I would like to know if there is a way to programmatically hide a volume node from the Data module, as there is other nodes hidden. Tried to find the function to do that, but no success. Thanks!

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## [Nightly extension build for Slicer-4.11.20200930](https://discourse.slicer.org/t/nightly-extension-build-for-slicer-4-11-20200930/14055)

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**Author:** [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Replies:** 5\
**Last updated:** [October 16, 2020, 2:52pm UTC](https://discourse.slicer.org/t/nightly-extension-build-for-slicer-4-11-20200930/14055 "2020-10-16T14:52:31Z")

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@jcfr @Sam\_Horvath Is nightly extension build enabled for latest stable (Slicer-4.11.20200930)? It would be important to have this, since Slicer-4.13 is not functional yet, and we need a way to distribute extension upda…

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## [Compiling SlicerCAT for IPad](https://discourse.slicer.org/t/compiling-slicercat-for-ipad/14057)

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**Author:** [@flaviu2](https://discourse.slicer.org/u/flaviu2)\
**Replies:** 1\
**Last updated:** [October 15, 2020, 9:10pm UTC](https://discourse.slicer.org/t/compiling-slicercat-for-ipad/14057 "2020-10-15T21:10:18Z")

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Hello. This post is related with this one: https://discourse.vtk.org/t/compiling-slicercat-for-mac-os/4274/2 SlicerCAT can be compiled now for IPad ? Can I found some docs about this operation, anything ?

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