# Development

**URL:** https://discourse.slicer.org/c/dev/5.md?no_subcategories=false&page=7

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

**Page:** 8

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## [Are there any non medical development and application cases here?](https://discourse.slicer.org/t/are-there-any-non-medical-development-and-application-cases-here/31650)

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**Author:** [@iwangwangwang](https://discourse.slicer.org/u/iwangwangwang)\
**Replies:** 3\
**Last updated:** [September 12, 2023, 5:47pm UTC](https://discourse.slicer.org/t/are-there-any-non-medical-development-and-application-cases-here/31650 "2023-09-12T17:47:44Z")

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Are there any non medical development and application cases here? Please give me some guidance

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## [Incorrect method signature for addAttribute of qMRMLNodeComboBox?](https://discourse.slicer.org/t/incorrect-method-signature-for-addattribute-of-qmrmlnodecombobox/43015)

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**Author:** [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)\
**Replies:** 2\
**Last updated:** [May 21, 2025, 10:48am UTC](https://discourse.slicer.org/t/incorrect-method-signature-for-addattribute-of-qmrmlnodecombobox/43015 "2025-05-21T10:48:07Z")

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Using Slicer Preview 5.9.0-2025-05-16 When calling a qMRMLNodeComboBox addAttribute with 2 input arguments I observe no error however the help method indicates there should be 3 input arguments: node\_combobox = slicer.…

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## [Baffle planner input - proposal - frustration](https://discourse.slicer.org/t/baffle-planner-input-proposal-frustration/42859)

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**Author:** [@Esteban\_Barreiro](https://discourse.slicer.org/u/Esteban_Barreiro)\
**Replies:** 11\
**Last updated:** [May 19, 2025, 4:05am UTC](https://discourse.slicer.org/t/baffle-planner-input-proposal-frustration/42859 "2025-05-19T04:05:56Z")

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Hi there lovely scientific nerdi comunity! Love you all! Im a teacher, and one of the modules I use to teach for medical institutions such hospitals, clinics and i+d+i+i … Im writing this post cause I think that, in so…

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## [How to bypass the git clone operations during the 3D Slicer build?](https://discourse.slicer.org/t/how-to-bypass-the-git-clone-operations-during-the-3d-slicer-build/42926)

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**Author:** [@MarkLiu](https://discourse.slicer.org/u/MarkLiu)\
**Replies:** 4\
**Last updated:** [May 19, 2025, 2:11am UTC](https://discourse.slicer.org/t/how-to-bypass-the-git-clone-operations-during-the-3d-slicer-build/42926 "2025-05-19T02:11:04Z")

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Dear Community, I’m developing an application based on 3D Slicer. And I have locally built 3D Slicer successfully with superbuild set to true. It is known that for the very first build, the git clone operations will be…

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## [Scissors's Fill Inside operation issue](https://discourse.slicer.org/t/scissorss-fill-inside-operation-issue/35107)

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**Author:** [@MJamal](https://discourse.slicer.org/u/MJamal)\
**Replies:** 8\
**Last updated:** [May 18, 2025, 12:31pm UTC](https://discourse.slicer.org/t/scissorss-fill-inside-operation-issue/35107 "2025-05-18T12:31:28Z")

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Hello again, I have applied the scissors’ fill-inside operation to segment 1, but I am encountering the following issues: At minute 0:52, you will notice that the operation is not entirely applied to the part where it…

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## [When creating a extension using Slicer5.9, I've found that the only available type options are "default" and "superbuild".](https://discourse.slicer.org/t/when-creating-a-extension-using-slicer5-9-ive-found-that-the-only-available-type-options-are-default-and-superbuild/42963)

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**Author:** [@zhaokaien](https://discourse.slicer.org/u/zhaokaien)\
**Replies:** 4\
**Last updated:** [May 18, 2025, 11:40am UTC](https://discourse.slicer.org/t/when-creating-a-extension-using-slicer5-9-ive-found-that-the-only-available-type-options-are-default-and-superbuild/42963 "2025-05-18T11:40:53Z")

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I have successfully built Slicer using the 5.9 source code. However, when I use the generated Slicer application and try to create an extension, in the Extension Wizard interface, I only see two options for “Type” when c…

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## [CTK axis widget in 3Drendering](https://discourse.slicer.org/t/ctk-axis-widget-in-3drendering/42962)

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**Author:** [@Pierre\_Bour](https://discourse.slicer.org/u/Pierre_Bour)\
**Replies:** 0\
**Last updated:** [May 16, 2025, 12:07pm UTC](https://discourse.slicer.org/t/ctk-axis-widget-in-3drendering/42962 "2025-05-16T12:07:05Z")

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Dear all, I am working on a code to add a ctk widget in the 3D rendering in the upper right corner. I have currently something working but I was wondering if there is something more elegant that what I have done. …

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## [How to generate RAS bounding box possible to adjust by users ](https://discourse.slicer.org/t/how-to-generate-ras-bounding-box-possible-to-adjust-by-users/42947)

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**Author:** [@xwan](https://discourse.slicer.org/u/xwan)\
**Replies:** 0\
**Last updated:** [May 15, 2025, 3:05pm UTC](https://discourse.slicer.org/t/how-to-generate-ras-bounding-box-possible-to-adjust-by-users/42947 "2025-05-15T15:05:25Z")

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I’m working on an extension to generate a bounding box based on 6 or more points placed on the extreme boundaries of a region of interest (e.g., a tumor). Setup: The user loads multiple MR sequences from a single scan…

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## [Trouble loading custom scripted module (HallerIndex) in Slicer 5.8.1 on macOS](https://discourse.slicer.org/t/trouble-loading-custom-scripted-module-hallerindex-in-slicer-5-8-1-on-macos/42918)

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**Author:** [@giovaniwm](https://discourse.slicer.org/u/giovaniwm)\
**Replies:** 3\
**Last updated:** [May 14, 2025, 5:36pm UTC](https://discourse.slicer.org/t/trouble-loading-custom-scripted-module-hallerindex-in-slicer-5-8-1-on-macos/42918 "2025-05-14T17:36:40Z")

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Hello everyone, I’m trying to load a custom scripted module called HallerIndex into 3D Slicer 5.8.1 on macOS, but the module is not being recognized by the application. :wrench: My goals: The module aims to calculate t…

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## [Windows 11, 3D Slicer build fail](https://discourse.slicer.org/t/windows-11-3d-slicer-build-fail/42900)

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**Author:** [@BaekHyeonSu](https://discourse.slicer.org/u/BaekHyeonSu)\
**Replies:** 1\
**Last updated:** [May 13, 2025, 2:17am UTC](https://discourse.slicer.org/t/windows-11-3d-slicer-build-fail/42900 "2025-05-13T02:17:12Z")

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3D slicer build is required to create an extension module using C++. I installed QT5.15.2, git, and cmake in a Windows 11 environment, and built according to the development guide, but I found that the build was stoppe…

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## [Dentalsegementator error](https://discourse.slicer.org/t/dentalsegementator-error/42877)

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**Author:** [@yijie3091](https://discourse.slicer.org/u/yijie3091)\
**Replies:** 0\
**Last updated:** [May 11, 2025, 2:36pm UTC](https://discourse.slicer.org/t/dentalsegementator-error/42877 "2025-05-11T14:36:52Z")

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dear professor,when i download this“dentalsegmentator” extension，some questions above appeaer，how can i solve with them？

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## [Adjusting "Shift" Volume Rendering Display using Python](https://discourse.slicer.org/t/adjusting-shift-volume-rendering-display-using-python/11731)

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**Author:** [@Dootsiie](https://discourse.slicer.org/u/Dootsiie)\
**Replies:** 4\
**Last updated:** [May 9, 2025, 11:31am UTC](https://discourse.slicer.org/t/adjusting-shift-volume-rendering-display-using-python/11731 "2025-05-09T11:31:01Z")

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Hi, I am trying to visualize a volume using Python and volume rendering. When I render the volume, it is rather dark. I know I can solve this by moving the “Shift” bar under Display in Volume Rendering. Now I tried doi…

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## [Load self tests from a file external the main module](https://discourse.slicer.org/t/load-self-tests-from-a-file-external-the-main-module/42769)

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**Author:** [@ejm-revvity](https://discourse.slicer.org/u/ejm-revvity)\
**Replies:** 4\
**Last updated:** [May 8, 2025, 9:52pm UTC](https://discourse.slicer.org/t/load-self-tests-from-a-file-external-the-main-module/42769 "2025-05-08T21:52:46Z")

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I have a Slicer ScriptedLoadableModule and in the same physical file a series of tests. I would like to place the tests in a separate file. However, I’m not able to get the SelfTests module in Slicer to load/recognize th…

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## [Changing visibility of 3D Cube and 3D Axis Label through Python](https://discourse.slicer.org/t/changing-visibility-of-3d-cube-and-3d-axis-label-through-python/3650)

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**Author:** [@brynpitt](https://discourse.slicer.org/u/brynpitt)\
**Replies:** 2\
**Last updated:** [May 7, 2025, 3:09pm UTC](https://discourse.slicer.org/t/changing-visibility-of-3d-cube-and-3d-axis-label-through-python/3650 "2025-05-07T15:09:58Z")

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Hello all, I am trying to change the visibility of the 3D Cube and the 3D Axis Labels (in the 3D View) using Python. I want to do this because I am trying to customize the appearance of the main window at launch. I hav…

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## [How to modify the default prompt words in the option bar](https://discourse.slicer.org/t/how-to-modify-the-default-prompt-words-in-the-option-bar/42806)

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**Author:** [@slicer365](https://discourse.slicer.org/u/slicer365)\
**Replies:** 1\
**Last updated:** [May 6, 2025, 11:58am UTC](https://discourse.slicer.org/t/how-to-modify-the-default-prompt-words-in-the-option-bar/42806 "2025-05-06T11:58:48Z")

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I know that these contents may be determined by the underlying code of the program, such as “Select a Node”, “Select a Model”, and so on. Sometimes I need to design a slicer module, for example, in other languages, bu…

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## [SlicerVMTK not building on cdash for stable](https://discourse.slicer.org/t/slicervmtk-not-building-on-cdash-for-stable/42763)

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**Author:** [@chir.set](https://discourse.slicer.org/u/chir.set)\
**Replies:** 1\
**Last updated:** [May 1, 2025, 7:08pm UTC](https://discourse.slicer.org/t/slicervmtk-not-building-on-cdash-for-stable/42763 "2025-05-01T19:08:13Z")

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I just noticed that SlicerVMTK is not building on cdash for stable. A file is not found for inclusion. I tried a clean build and hit the same build failure. If I run cmake again after this failure, the build does comple…

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## [Dynamic Modeler "Curve cut" creates output model node, but it's empty (no surface)](https://discourse.slicer.org/t/dynamic-modeler-curve-cut-creates-output-model-node-but-its-empty-no-surface/42741)

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**Author:** [@JohnWick](https://discourse.slicer.org/u/JohnWick)\
**Replies:** 3\
**Last updated:** [May 1, 2025, 5:22pm UTC](https://discourse.slicer.org/t/dynamic-modeler-curve-cut-creates-output-model-node-but-its-empty-no-surface/42741 "2025-05-01T17:22:45Z")

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Hi everyone, I’m trying to use the Dynamic Modeler module via Python scripting in 3D Slicer to cut a model using a curve. My goal is to keep only the inside portion of the model, and I’m not using the Straight Cut optio…

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## [Display Glyph Size absolue](https://discourse.slicer.org/t/display-glyph-size-absolue/42300)

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**Author:** [@sarafv](https://discourse.slicer.org/u/sarafv)\
**Replies:** 2\
**Last updated:** [May 1, 2025, 4:53pm UTC](https://discourse.slicer.org/t/display-glyph-size-absolue/42300 "2025-05-01T16:53:44Z")

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Hello everybody, There is a way to set the display node glyph size as a physical length programmatically like pressing the button “absolue” in the Display Menu of Markups Module (see the attach)? When I set the size…

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## [Is there a way to limit node selector width for long node names?](https://discourse.slicer.org/t/is-there-a-way-to-limit-node-selector-width-for-long-node-names/42693)

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**Author:** [@mikebind](https://discourse.slicer.org/u/mikebind)\
**Replies:** 11\
**Last updated:** [April 30, 2025, 9:23am UTC](https://discourse.slicer.org/t/is-there-a-way-to-limit-node-selector-width-for-long-node-names/42693 "2025-04-30T09:23:36Z")

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I’m developing a module where users load a dynamic CT from DICOM as a Sequence. The automatic names for these nodes are generally very long, and are a pain for users to rename to shorten (just renaming in the subject hi…

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## [save and reload custom parameterNodeWrapper ](https://discourse.slicer.org/t/save-and-reload-custom-parameternodewrapper/42691)

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**Author:** [@ipostuma](https://discourse.slicer.org/u/ipostuma)\
**Replies:** 2\
**Last updated:** [April 28, 2025, 4:54pm UTC](https://discourse.slicer.org/t/save-and-reload-custom-parameternodewrapper/42691 "2025-04-28T16:54:02Z")

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Hi, I probably have a silly question, but I didn’t manage to find an answer in the forum. I am trying to write a custom module to manage a treatment planning simulation. Part of this module consist in associating segmen…

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## [Distribution of a Slicer Extension with weights of neural networks](https://discourse.slicer.org/t/distribution-of-a-slicer-extension-with-weights-of-neural-networks/42596)

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**Author:** [@IVarha](https://discourse.slicer.org/u/IVarha)\
**Replies:** 4\
**Last updated:** [April 28, 2025, 11:19am UTC](https://discourse.slicer.org/t/distribution-of-a-slicer-extension-with-weights-of-neural-networks/42596 "2025-04-28T11:19:18Z")

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Hello, I am developing an extension to a 3D slicer and I have noticed that I have some heavy files in resources. Is there any guidance how to handle that? GitHub does not allow files above 50 megabytes and I think that u…

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## [How to get a scene reliably and why is it null?](https://discourse.slicer.org/t/how-to-get-a-scene-reliably-and-why-is-it-null/42700)

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**Author:** [@chir.set](https://discourse.slicer.org/u/chir.set)\
**Replies:** 4\
**Last updated:** [April 27, 2025, 5:24pm UTC](https://discourse.slicer.org/t/how-to-get-a-scene-reliably-and-why-is-it-null/42700 "2025-04-27T17:24:39Z")

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Hello, I am stumbling on getting a scene node in most functions of a class while it is not null elsewhere in the same class (1, 2, 3). In the constructor of the referenced class for example, it is always null, and in m…

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## [Gesture of libs, path and DLLs while developing](https://discourse.slicer.org/t/gesture-of-libs-path-and-dlls-while-developing/42672)

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**Author:** [@Theophanis\_Eleftheri](https://discourse.slicer.org/u/Theophanis_Eleftheri)\
**Replies:** 1\
**Last updated:** [April 24, 2025, 3:41am UTC](https://discourse.slicer.org/t/gesture-of-libs-path-and-dlls-while-developing/42672 "2025-04-24T03:41:41Z")

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Hello, I’m trying to develop an extension for 3D Slicer using torch and many other libs. Those libs are currently installed in a conda environment (I have a plenty depending on the project). I’d like to develop my exten…

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## [PythonQt properties shadowing methods](https://discourse.slicer.org/t/pythonqt-properties-shadowing-methods/16992)

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**Author:** [@fbordignon](https://discourse.slicer.org/u/fbordignon)\
**Replies:** 15\
**Last updated:** [April 22, 2025, 9:24pm UTC](https://discourse.slicer.org/t/pythonqt-properties-shadowing-methods/16992 "2025-04-22T21:24:49Z")

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Hi all, I’ve noticed a strange behavior that I could not understand if it is a bug or intended. It seems to me that a property can sometimes shadow methods from qt objects. Example: qgw = qt.QGraphicsWidget() qgw.la…

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## [Should we start collecting software usage data?](https://discourse.slicer.org/t/should-we-start-collecting-software-usage-data/30873)

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**Author:** [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Replies:** 83\
**Last updated:** [April 22, 2025, 1:42am UTC](https://discourse.slicer.org/t/should-we-start-collecting-software-usage-data/30873 "2025-04-22T01:42:52Z")

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Several extension developers asked about and toying with the idea of starting to collect software usage data. I completely agree that such data can be useful for prioritizing developments and can be a good motivator for …

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## [VTK build fails on Windows in Debug mode](https://discourse.slicer.org/t/vtk-build-fails-on-windows-in-debug-mode/42590)

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**Author:** [@ungi](https://discourse.slicer.org/u/ungi)\
**Replies:** 2\
**Last updated:** [April 20, 2025, 2:28am UTC](https://discourse.slicer.org/t/vtk-build-fails-on-windows-in-debug-mode/42590 "2025-04-20T02:28:32Z")

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Hi, I followed the Slicer build instructions today on Windows with default CMake options. The Release build went well with no errors. But in Debug mode, one project from VTK resulted in a link error. Looks like the resul…

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## [Slicer build Error](https://discourse.slicer.org/t/slicer-build-error/42377)

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**Author:** [@zhuofalin](https://discourse.slicer.org/u/zhuofalin)\
**Replies:** 4\
**Last updated:** [April 16, 2025, 4:12pm UTC](https://discourse.slicer.org/t/slicer-build-error/42377 "2025-04-16T16:12:05Z")

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Recently, I used cmake to compile the latest version of 3dSlicer and encountered many problems. I would like to ask you for advice. :rofl: Build Environment System: Windows 10 22H2 Cmake: 4.0.0 Build Steps 1. Use C…

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## [Error using MarkupsToModel Logic](https://discourse.slicer.org/t/error-using-markupstomodel-logic/42562)

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**Author:** [@bloem1412](https://discourse.slicer.org/u/bloem1412)\
**Replies:** 0\
**Last updated:** [April 14, 2025, 4:52pm UTC](https://discourse.slicer.org/t/error-using-markupstomodel-logic/42562 "2025-04-14T16:52:18Z")

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Operating system: Windows 10 Slicer version: 5.8.0 I’m using the MarkupsToModel logic in my own module to make a closed surface model of a list of fiducials. My code has the desired effect, when I click the button in m…

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## [Display heatmap of Hounsfield values on registered surface object for cortical bone contact](https://discourse.slicer.org/t/display-heatmap-of-hounsfield-values-on-registered-surface-object-for-cortical-bone-contact/42389)

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**Author:** [@LindenRB](https://discourse.slicer.org/u/LindenRB)\
**Replies:** 8\
**Last updated:** [April 14, 2025, 2:19am UTC](https://discourse.slicer.org/t/display-heatmap-of-hounsfield-values-on-registered-surface-object-for-cortical-bone-contact/42389 "2025-04-14T02:19:54Z")

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Hi all, I’m looking at a project to map the intensity (in HU) of a CT scan where it contacts a registered surface (STL) model, so I can quantify the cortical vs cancellous bone contact zones in different regions along a…

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## [Image Orientation in SlicerIGTs Volume Reslice Driver](https://discourse.slicer.org/t/image-orientation-in-slicerigts-volume-reslice-driver/42526)

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**Author:** [@Khaleel\_Ur\_Rehman](https://discourse.slicer.org/u/Khaleel_Ur_Rehman)\
**Replies:** 1\
**Last updated:** [April 10, 2025, 6:23pm UTC](https://discourse.slicer.org/t/image-orientation-in-slicerigts-volume-reslice-driver/42526 "2025-04-10T18:23:29Z")

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Hi, @Sam\_Horvath, I am using volume reslice driver to visualize registration and tracking using an optical tracking system. The reslice driver is working good. As you might know that the driver has the generic Axial, Cor…

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