# Development

**URL:** https://discourse.slicer.org/c/dev/5.md?no_subcategories=false&page=25

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

**Page:** 26

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## [Build loadable extension with my own shared library](https://discourse.slicer.org/t/build-loadable-extension-with-my-own-shared-library/33988)

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**Author:** [@nnzzll](https://discourse.slicer.org/u/nnzzll)\
**Replies:** 0\
**Last updated:** [January 26, 2024, 9:36am UTC](https://discourse.slicer.org/t/build-loadable-extension-with-my-own-shared-library/33988 "2024-01-26T09:36:06Z")

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I’m developing a loadable extension. As I know, a C++ loadable extension has three part: vtkSlicer${Module\_Name}ModuleLogic, qSlicer${MODULE\_NAME}ModuleWidgets, and the module itself. If I build moduleLogic or ModuleWi…

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## [How to handle the new parameter node wrapper?](https://discourse.slicer.org/t/how-to-handle-the-new-parameter-node-wrapper/33957)

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**Author:** [@chir.set](https://discourse.slicer.org/u/chir.set)\
**Replies:** 4\
**Last updated:** [January 25, 2024, 9:05pm UTC](https://discourse.slicer.org/t/how-to-handle-the-new-parameter-node-wrapper/33957 "2024-01-25T21:05:48Z")

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Hi @lassoan, @pieper, @jcfr, @devs, I am in the process of porting some modules of SlicerVMTK to the new parameter node wrapper. A sample port is available in this branch. I am requesting advice about handling things b…

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## [How to compile and run the files.](https://discourse.slicer.org/t/how-to-compile-and-run-the-files/33835)

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**Author:** [@Arun03Kumar](https://discourse.slicer.org/u/Arun03Kumar)\
**Replies:** 7\
**Last updated:** [January 24, 2024, 4:02pm UTC](https://discourse.slicer.org/t/how-to-compile-and-run-the-files/33835 "2024-01-24T16:02:48Z")

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my build is completed just now, now I have two folders one contains the repository cloned file and another one contains the build files, the build folder now has a lot more folders, now I am totally confused that in whic…

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## [New interpolation tool](https://discourse.slicer.org/t/new-interpolation-tool/33932)

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**Author:** [@Mehran](https://discourse.slicer.org/u/Mehran)\
**Replies:** 2\
**Last updated:** [January 24, 2024, 8:02am UTC](https://discourse.slicer.org/t/new-interpolation-tool/33932 "2024-01-24T08:02:58Z")

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Hi All, I am thrilled to share our recent tool for filling between slices in segmentation module. We would love to hear your thoughts and feedback! :nerd\_face: we designed it for muscle segmentation though it can be us…

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## [Segmentation of composite materials from CT images](https://discourse.slicer.org/t/segmentation-of-composite-materials-from-ct-images/33910)

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**Author:** [@tueboesen](https://discourse.slicer.org/u/tueboesen)\
**Replies:** 1\
**Last updated:** [January 22, 2024, 6:09pm UTC](https://discourse.slicer.org/t/segmentation-of-composite-materials-from-ct-images/33910 "2024-01-22T18:09:09Z")

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I am investigating the tools currently available to view and interactively segment 3D data (made from lots of 2D slices), specifically for material composites from CT data. (So data that typically have a lot of similar f…

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## [Improve ambient occlusion in volume rendering](https://discourse.slicer.org/t/improve-ambient-occlusion-in-volume-rendering/33590)

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**Author:** [@LucasGandel](https://discourse.slicer.org/u/LucasGandel)\
**Replies:** 10\
**Last updated:** [January 22, 2024, 4:39pm UTC](https://discourse.slicer.org/t/improve-ambient-occlusion-in-volume-rendering/33590 "2024-01-22T16:39:57Z")

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Opening the discussion for improvements for transparent rendering. I find the current results disturbing as AO makes the whole thing appear opaque. Here are potential approaches I’m considering to introduce, any insight …

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## [How to develop 3D slicer on a website](https://discourse.slicer.org/t/how-to-develop-3d-slicer-on-a-website/33873)

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**Author:** [@bodenstandig](https://discourse.slicer.org/u/bodenstandig)\
**Replies:** 2\
**Last updated:** [January 22, 2024, 2:52am UTC](https://discourse.slicer.org/t/how-to-develop-3d-slicer-on-a-website/33873 "2024-01-22T02:52:06Z")

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Hello to all members of the Slicer community! I am an undergraduate student majoring in computer science, currently working on my graduation project. For my final project, I aim to transplant the 3D image browsing functi…

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## [What's wrong when trying to convert a model's coordinate points into a volume?](https://discourse.slicer.org/t/whats-wrong-when-trying-to-convert-a-models-coordinate-points-into-a-volume/33791)

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**Author:** [@jumbojing](https://discourse.slicer.org/u/jumbojing)\
**Replies:** 6\
**Last updated:** [January 18, 2024, 11:59am UTC](https://discourse.slicer.org/t/whats-wrong-when-trying-to-convert-a-models-coordinate-points-into-a-volume/33791 "2024-01-18T11:59:09Z")

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First, create a new volume and obtain the coordinates of the model based on it. Convert the coordinates of the model (RAS) to IJK (from:  (slicer.readthedocs.io)) def ras2IjkFor(ps, reVol): mat = vtk.vtkMatrix4x4() …

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## [How to create a new project](https://discourse.slicer.org/t/how-to-create-a-new-project/33839)

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**Author:** [@Diego\_fabian](https://discourse.slicer.org/u/Diego_fabian)\
**Replies:** 1\
**Last updated:** [January 18, 2024, 6:01am UTC](https://discourse.slicer.org/t/how-to-create-a-new-project/33839 "2024-01-18T06:01:42Z")

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How to create a new project, I am a research student in biomedical engineering, maybe someone who will help me, thank you very much (by Google Translate) Original in SpanishComo crear un nuevo proyecto soy estudiante d…

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## [Mouse Focus issue when using keyboard shortcuts in 2023-12-31 preview](https://discourse.slicer.org/t/mouse-focus-issue-when-using-keyboard-shortcuts-in-2023-12-31-preview/33642)

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**Author:** [@hherhold](https://discourse.slicer.org/u/hherhold)\
**Replies:** 4\
**Last updated:** [January 17, 2024, 8:05pm UTC](https://discourse.slicer.org/t/mouse-focus-issue-when-using-keyboard-shortcuts-in-2023-12-31-preview/33642 "2024-01-17T20:05:07Z")

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I think there is an issue with focus (maybe). I can replicate this with any scene. Paint a small section in a segment, preferably isolated. Click on Islands effect, select remove selected island. Click on the painted i…

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## [Integrate Slicer into a web interface](https://discourse.slicer.org/t/integrate-slicer-into-a-web-interface/33827)

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**Author:** [@MarcMR](https://discourse.slicer.org/u/MarcMR)\
**Replies:** 2\
**Last updated:** [January 17, 2024, 6:17pm UTC](https://discourse.slicer.org/t/integrate-slicer-into-a-web-interface/33827 "2024-01-17T18:17:43Z")

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Hello, We are using 3D slicer with some custom made plugins (plugins that connect to images in our database and others). We want other users to interacts with “our” 3d slicer. Ideally (instead of them installing it loc…

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## [ParameterNodeWrapper with dynamic Minimum/Maximum](https://discourse.slicer.org/t/parameternodewrapper-with-dynamic-minimum-maximum/33807)

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**Author:** [@che85](https://discourse.slicer.org/u/che85)\
**Replies:** 1\
**Last updated:** [January 16, 2024, 11:11pm UTC](https://discourse.slicer.org/t/parameternodewrapper-with-dynamic-minimum-maximum/33807 "2024-01-16T23:11:51Z")

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Hi, I am working on adapting some code to use the parameterNodeWrapper and was wondering if there is any way to set the validator’s Minimum and Maximum values of ctkSliderWidget dynamically at runtime. Use case I have …

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## [Getting linear distances between fiducial landmarks](https://discourse.slicer.org/t/getting-linear-distances-between-fiducial-landmarks/33065)

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**Author:** [@paleomariomm](https://discourse.slicer.org/u/paleomariomm)\
**Replies:** 3\
**Last updated:** [January 16, 2024, 4:33pm UTC](https://discourse.slicer.org/t/getting-linear-distances-between-fiducial-landmarks/33065 "2024-01-16T16:33:34Z")

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I have created 5 fiducial markups in Slicer. I would like to obtain the linear measurements between all of them (two by two). I know that by selecting two points and right clicking we can obtain the linear measurement …

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## [Transform in ijk](https://discourse.slicer.org/t/transform-in-ijk/33779)

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**Author:** [@brandus1](https://discourse.slicer.org/u/brandus1)\
**Replies:** 1\
**Last updated:** [January 15, 2024, 7:56pm UTC](https://discourse.slicer.org/t/transform-in-ijk/33779 "2024-01-15T19:56:17Z")

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Hi, I am trying to replicate the behavior of the Resample module directly on numpy arrays, because I have a separate service that cannot integrate or call slicer directly unfortunately. This is the basic operation I wo…

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## [Python Unit Test Runner Extension](https://discourse.slicer.org/t/python-unit-test-runner-extension/33780)

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**Author:** [@Thibault\_Pelletier](https://discourse.slicer.org/u/Thibault_Pelletier)\
**Replies:** 3\
**Last updated:** [January 15, 2024, 3:23pm UTC](https://discourse.slicer.org/t/python-unit-test-runner-extension/33780 "2024-01-15T15:23:58Z")

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Hi everyone, I’m in the process of creating a Python Unit Test Runner Extension. This module provides (IMO) an efficient way to develop new Python based extensions and allows to do test driven development by having : …

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## [C++ and C locale are not equal after creation of qSlicerApplication](https://discourse.slicer.org/t/c-and-c-locale-are-not-equal-after-creation-of-qslicerapplication/33718)

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**Author:** [@aymeric.chataigner](https://discourse.slicer.org/u/aymeric.chataigner)\
**Replies:** 1\
**Last updated:** [January 15, 2024, 1:38pm UTC](https://discourse.slicer.org/t/c-and-c-locale-are-not-equal-after-creation-of-qslicerapplication/33718 "2024-01-15T13:38:10Z")

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Hi, I added some code in Main.cxx to check the values of C and C++ locale settings: int SlicerAppMain(int argc, char\* argv\[\]) { typedef qSlicerAppMainWindow SlicerMainWindowType; typedef qSlicerStyle SlicerAppStyle…

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## [Modifying Extension's CMakeLists results in reconfigure the whole Application](https://discourse.slicer.org/t/modifying-extensions-cmakelists-results-in-reconfigure-the-whole-application/33749)

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**Author:** [@nnzzll](https://discourse.slicer.org/u/nnzzll)\
**Replies:** 1\
**Last updated:** [January 15, 2024, 5:44am UTC](https://discourse.slicer.org/t/modifying-extensions-cmakelists-results-in-reconfigure-the-whole-application/33749 "2024-01-15T05:44:18Z")

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I am developing a customized application generated by SlicerCustomAppTemplate. From my experience of developing Slicer loadable extensions, it is supposed that when you edit the extension’s CMakeLists.txt, only the exte…

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## [How to contribute my Matlab coding into 3D Slicer](https://discourse.slicer.org/t/how-to-contribute-my-matlab-coding-into-3d-slicer/33765)

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**Author:** [@akmal871026](https://discourse.slicer.org/u/akmal871026)\
**Replies:** 2\
**Last updated:** [January 15, 2024, 5:33am UTC](https://discourse.slicer.org/t/how-to-contribute-my-matlab-coding-into-3d-slicer/33765 "2024-01-15T05:33:29Z")

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Dear All, I have some code in Matlab syntax. This is about the segmentation tumor on Iodine-131 SPECT imaging. Anyone know how to contribute my coding into 3D Slicer? What I meant is I want put into the extension mana…

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## [New python notebook library](https://discourse.slicer.org/t/new-python-notebook-library/33758)

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**Author:** [@mhalle](https://discourse.slicer.org/u/mhalle)\
**Replies:** 0\
**Last updated:** [January 13, 2024, 1:03pm UTC](https://discourse.slicer.org/t/new-python-notebook-library/33758 "2024-01-13T13:03:58Z")

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Just saw this new open source variant on the python notebook concept (and an alternative to Jupyter notebooks) that might be useful with Slicer: Some of the differences from Jupyter: Fully reactive: change a variabl…

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## [Slicer superbuild error in Python/SSL](https://discourse.slicer.org/t/slicer-superbuild-error-in-python-ssl/33669)

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**Author:** [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Replies:** 5\
**Last updated:** [January 8, 2024, 7:42pm UTC](https://discourse.slicer.org/t/slicer-superbuild-error-in-python-ssl/33669 "2024-01-08T19:42:19Z")

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Hi all, I have updated the Slicer source code to the latest and trying to build it. On one computer the build succeeded, but on the other one I keep getting the same error. I tried it several times during the last days …

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## [Slicer to Magic Leap Integration](https://discourse.slicer.org/t/slicer-to-magic-leap-integration/16724)

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**Author:** [@cshreyas](https://discourse.slicer.org/u/cshreyas)\
**Replies:** 16\
**Last updated:** [January 6, 2024, 7:01pm UTC](https://discourse.slicer.org/t/slicer-to-magic-leap-integration/16724 "2024-01-06T19:01:49Z")

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Hello, I am exploring ways to integrate Slicer 3D. I am looking to use SlicerVirtualReality. Can someone help me with file format that gets IN and Out of SlicerVirtualReality? This will be helpful to explore its compat…

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## [Custom undo/redo function for all process](https://discourse.slicer.org/t/custom-undo-redo-function-for-all-process/33601)

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**Author:** [@park](https://discourse.slicer.org/u/park)\
**Replies:** 1\
**Last updated:** [January 3, 2024, 6:11pm UTC](https://discourse.slicer.org/t/custom-undo-redo-function-for-all-process/33601 "2024-01-03T18:11:25Z")

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Hi all I am currently working on developing a custom program using 3D Slicer and have a question I’d like to discuss in here. We need for an undo-redo feature for all functions (including camera view adjustments). Upo…

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## [Help with parameterNodeWrapper](https://discourse.slicer.org/t/help-with-parameternodewrapper/33582)

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**Author:** [@jmhuie](https://discourse.slicer.org/u/jmhuie)\
**Replies:** 1\
**Last updated:** [January 3, 2024, 6:02am UTC](https://discourse.slicer.org/t/help-with-parameternodewrapper/33582 "2024-01-03T06:02:41Z")

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I am trying to familiarize myself with using a parameterNodeWrapper to save parameters for my custom modules. Based on the documentation and analyzing the exampled scripted modules from the Extension Wizard, I have a gen…

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## [Problem with debugging on Windows](https://discourse.slicer.org/t/problem-with-debugging-on-windows/33528)

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**Author:** [@nnzzll](https://discourse.slicer.org/u/nnzzll)\
**Replies:** 1\
**Last updated:** [January 2, 2024, 10:45am UTC](https://discourse.slicer.org/t/problem-with-debugging-on-windows/33528 "2024-01-02T10:45:17Z")

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I followed the debug instructions here and trying to debug my C++ extensions. However, I can never start it. It says cannot find python36.dll, but I’m using Slicer5.6.0 of which python version is 3.9, so there is no pyt…

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## [Use of qt.Signal leads to a crash on exit](https://discourse.slicer.org/t/use-of-qt-signal-leads-to-a-crash-on-exit/8321)

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**Author:** [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Replies:** 5\
**Last updated:** [December 30, 2023, 1:58pm UTC](https://discourse.slicer.org/t/use-of-qt-signal-leads-to-a-crash-on-exit/8321 "2023-12-30T13:58:42Z")

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Recently, I have been investigating the source of a crash on exit. To reproduce the crash: ./Slicer --no-main-window --testing Notes: removing the connection to the closed signal object here in the DICOM module avoi…

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## [Custom Build App Win11 VS 2022 Qt5.15.2 Error FindCTK.cmake](https://discourse.slicer.org/t/custom-build-app-win11-vs-2022-qt5-15-2-error-findctk-cmake/33554)

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**Author:** [@apparrilla](https://discourse.slicer.org/u/apparrilla)\
**Replies:** 0\
**Last updated:** [December 29, 2023, 10:51am UTC](https://discourse.slicer.org/t/custom-build-app-win11-vs-2022-qt5-15-2-error-findctk-cmake/33554 "2023-12-29T10:51:48Z")

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Hi Everyone! I´m trying to build a Custom App with SlicerCustomAppTemplate in Windows 11 with VS 2022 and Qt5.15.2 and I get this error: CMake Error at CMakeLists.txt:890 (find\_package): 33\> By not providing “FindCTK.…

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## [Installing Slicer extension from script](https://discourse.slicer.org/t/installing-slicer-extension-from-script/25241)

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**Author:** [@Nadya\_Shusharina](https://discourse.slicer.org/u/Nadya_Shusharina)\
**Replies:** 5\
**Last updated:** [December 28, 2023, 8:22am UTC](https://discourse.slicer.org/t/installing-slicer-extension-from-script/25241 "2023-12-28T08:22:37Z")

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Hello, I would like to build a Docker container with Slicer 5.0.2 r30822 linux-amd64, and with Slicer extensions installed. To do that, I am trying to have Slicer install extensions from a python script: emm = slicer.a…

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## [Possible New Slicer Extension - DICOMToNRRDBatchProcessing](https://discourse.slicer.org/t/possible-new-slicer-extension-dicomtonrrdbatchprocessing/33284)

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**Author:** [@amyers](https://discourse.slicer.org/u/amyers)\
**Replies:** 4\
**Last updated:** [December 26, 2023, 1:42pm UTC](https://discourse.slicer.org/t/possible-new-slicer-extension-dicomtonrrdbatchprocessing/33284 "2023-12-26T13:42:33Z")

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Hi, I’m looking to contribute a new slicer extension that takes a DICOM directory of patients and outputs NRRD files for each patient’s series into a DICOM conforming folder hierarchy Patient/Study/Series. So, there’d b…

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## [Extension configure error for Mac Os on cdash](https://discourse.slicer.org/t/extension-configure-error-for-mac-os-on-cdash/33503)

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**Author:** [@chir.set](https://discourse.slicer.org/u/chir.set)\
**Replies:** 0\
**Last updated:** [December 22, 2023, 7:28pm UTC](https://discourse.slicer.org/t/extension-configure-error-for-mac-os-on-cdash/33503 "2023-12-22T19:28:24Z")

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Hi, cdash is reporting a configure error for ExtraMarkups extension for Mac. This concerns Slicer stable only, while the extension builds for preview. Imported target "MRMLCore" includes non-existent path "/Appl…

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## [Screen-space ambient occlusion for volume rendering](https://discourse.slicer.org/t/screen-space-ambient-occlusion-for-volume-rendering/32323)

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**Author:** [@LucasGandel](https://discourse.slicer.org/u/LucasGandel)\
**Replies:** 49\
**Last updated:** [December 19, 2023, 4:34pm UTC](https://discourse.slicer.org/t/screen-space-ambient-occlusion-for-volume-rendering/32323 "2023-12-19T16:34:56Z")

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The goal of this topic is to track the feasibility and interest for implementing SSAO for volume rendering in VTK / 3DSlicer. As highlighted by @lassoan in this post, SSAO for volumes could be a game-changer especially …

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