# Development

**URL:** https://discourse.slicer.org/c/dev/5.md?no_subcategories=false&page=1

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

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## [vtkPlanarContourToBinaryLabelmapConversionRule](https://discourse.slicer.org/t/vtkplanarcontourtobinarylabelmapconversionrule/47507)

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**Author:** [@ferhue](https://discourse.slicer.org/u/ferhue)\
**Replies:** 8\
**Last updated:** [July 1, 2026, 1:58pm UTC](https://discourse.slicer.org/t/vtkplanarcontourtobinarylabelmapconversionrule/47507 "2026-07-01T13:58:28Z")

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I am interested in creating a variant of SlicerRT/DicomRtImportExport/ConversionRules/vtkPlanarContourToClosedSurfaceConversionRule.cxx at master · SlicerRt/SlicerRT · GitHub that directly converts a 2D Planar Contour t…

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## [AI Agent Skills for 3D Slicer?](https://discourse.slicer.org/t/ai-agent-skills-for-3d-slicer/45893)

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**Author:** [@mikebind](https://discourse.slicer.org/u/mikebind)\
**Replies:** 6\
**Last updated:** [June 29, 2026, 9:56am UTC](https://discourse.slicer.org/t/ai-agent-skills-for-3d-slicer/45893 "2026-06-29T09:56:07Z")

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I noticed in the most recent release notes for VS Code support for “Agent Skills”, which are an open-standard platform-agnostic method of specifying helpful standards and domain-specific reference materials for AI Agents…

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## [How to use 3D Slicer for Cranial Asymmetry Assessment in Infants?](https://discourse.slicer.org/t/how-to-use-3d-slicer-for-cranial-asymmetry-assessment-in-infants/47370)

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**Author:** [@Lucas\_Villalta](https://discourse.slicer.org/u/Lucas_Villalta)\
**Replies:** 3\
**Last updated:** [June 18, 2026, 4:14pm UTC](https://discourse.slicer.org/t/how-to-use-3d-slicer-for-cranial-asymmetry-assessment-in-infants/47370 "2026-06-18T16:14:56Z")

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Hi, I’m a Pediatric Physical Therapist and I work with infants with Cranial Asymmetries. However, all softwares for asymmetry analysis are paid and I would like to know if I can use this software to calculate these asymm…

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## [CMake Flag to CustomApp not to read \`slicerrc.py\` or define other file?](https://discourse.slicer.org/t/cmake-flag-to-customapp-not-to-read-slicerrc-py-or-define-other-file/39046)

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**Author:** [@apparrilla](https://discourse.slicer.org/u/apparrilla)\
**Replies:** 7\
**Last updated:** [June 17, 2026, 11:43am UTC](https://discourse.slicer.org/t/cmake-flag-to-customapp-not-to-read-slicerrc-py-or-define-other-file/39046 "2026-06-17T11:43:56Z")

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Hi everyone! I´ve some trouble betweeen CustomApp and normal Slicer because first one read slicerrc.py file. Is ther any way to complie CustomApp not to read this file or define a custom rc file to be saved instead? Th…

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## [Is there a Python API to get MLC/Jaw position sequences from a VMAT plan?](https://discourse.slicer.org/t/is-there-a-python-api-to-get-mlc-jaw-position-sequences-from-a-vmat-plan/47323)

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**Author:** [@Aki](https://discourse.slicer.org/u/Aki)\
**Replies:** 2\
**Last updated:** [June 16, 2026, 11:16pm UTC](https://discourse.slicer.org/t/is-there-a-python-api-to-get-mlc-jaw-position-sequences-from-a-vmat-plan/47323 "2026-06-16T23:16:47Z")

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Hi, there I would like to get MLC/Jaw position sequences and dose/MU data at each control point from data imported into 3DSlicer. Is there any API to access such data. I would like to make a python script or extension t…

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## [New extension: MuscleMap --  Automated Whole-Body Muscle Segmentation](https://discourse.slicer.org/t/new-extension-musclemap-automated-whole-body-muscle-segmentation/47364)

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**Author:** [@Eddo\_Wesselink](https://discourse.slicer.org/u/Eddo_Wesselink)\
**Replies:** 0\
**Last updated:** [June 16, 2026, 5:51pm UTC](https://discourse.slicer.org/t/new-extension-musclemap-automated-whole-body-muscle-segmentation/47364 "2026-06-16T17:51:22Z")

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New extension: MuscleMap — open-source, community-supported automated whole-body muscle segmentation MuscleMap is a 3D Slicer extension for fully automatic segmentation of skeletal muscle in MRI and CT. It is develop…

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## [Bump minimum CMake version to 3.28.1?](https://discourse.slicer.org/t/bump-minimum-cmake-version-to-3-28-1/47247)

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**Author:** [@dzenanz](https://discourse.slicer.org/u/dzenanz)\
**Replies:** 0\
**Last updated:** [June 5, 2026, 2:35pm UTC](https://discourse.slicer.org/t/bump-minimum-cmake-version-to-3-28-1/47247 "2026-06-05T14:35:30Z")

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CMake 3.28.1 shipped with Ubuntu 24.04 LTS. I suggest Slicer bumps it to that version after 5.12 is tagged. We are strongly considering the same bump in ITK. Please pitch in with your opinions.

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## [Ported mlx version of TotalSegmentator - Apple Silicon](https://discourse.slicer.org/t/ported-mlx-version-of-totalsegmentator-apple-silicon/47213)

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**Author:** [@pox\_got](https://discourse.slicer.org/u/pox_got)\
**Replies:** 0\
**Last updated:** [June 2, 2026, 2:58pm UTC](https://discourse.slicer.org/t/ported-mlx-version-of-totalsegmentator-apple-silicon/47213 "2026-06-02T14:58:22Z")

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Please check it out and provide feedback.

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## [Testing dashboard shows no tests executed when filtering is used](https://discourse.slicer.org/t/testing-dashboard-shows-no-tests-executed-when-filtering-is-used/47144)

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**Author:** [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Replies:** 5\
**Last updated:** [May 28, 2026, 2:12pm UTC](https://discourse.slicer.org/t/testing-dashboard-shows-no-tests-executed-when-filtering-is-used/47144 "2026-05-28T14:12:31Z")

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Hi all, I wanted to look at the test results of some extensions today. First I thought that the factory machine does not run any tests, because filtering on SlicerRT I saw this (and I know the extension has around 70 te…

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## [Change the left control panel size](https://discourse.slicer.org/t/change-the-left-control-panel-size/18072)

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**Author:** [@full\_stack\_master](https://discourse.slicer.org/u/full_stack_master)\
**Replies:** 2\
**Last updated:** [May 9, 2026, 12:53pm UTC](https://discourse.slicer.org/t/change-the-left-control-panel-size/18072 "2026-05-09T12:53:50Z")

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I want to reduce the left control panel size in code can you help me

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## [Seeking Community Input on Upcoming trame‑slicer Applications](https://discourse.slicer.org/t/seeking-community-input-on-upcoming-trame-slicer-applications/46874)

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**Author:** [@Thibault\_Pelletier](https://discourse.slicer.org/u/Thibault_Pelletier)\
**Replies:** 2\
**Last updated:** [May 1, 2026, 4:02am UTC](https://discourse.slicer.org/t/seeking-community-input-on-upcoming-trame-slicer-applications/46874 "2026-05-01T04:02:59Z")

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Hi everyone! Following the discussions on the trame-slicer repo regarding Jupyter integration and first class citizen applications in trame-slicer we will be adding applications to the trame-slicer package starting the …

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## [Tractography ROI selection via script](https://discourse.slicer.org/t/tractography-roi-selection-via-script/36466)

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**Author:** [@fcruz](https://discourse.slicer.org/u/fcruz)\
**Replies:** 1\
**Last updated:** [April 30, 2026, 1:14pm UTC](https://discourse.slicer.org/t/tractography-roi-selection-via-script/36466 "2026-04-30T13:14:02Z")

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Operating system: Ubutu 22.04 Slicer version: 5.6.2 I would like to automatically extract fiber bundles from a UKF tractography vtk file using the Tractography ROI selection module. I have a label map that contains Fre…

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## [SlicerQR Development](https://discourse.slicer.org/t/slicerqr-development/15954)

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**Author:** [@spycolyf](https://discourse.slicer.org/u/spycolyf)\
**Replies:** 155\
**Last updated:** [April 27, 2026, 9:56am UTC](https://discourse.slicer.org/t/slicerqr-development/15954 "2026-04-27T09:56:37Z")

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@jcfr @pieper @lassoan @superlib Good Morning. I’m starting to think about how to deploy SlicerQR to 25,000 PCs across the Mayo Enterprise. After building the package, it consists of over 7000 files at a total size of o…

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## [New Scene Snapshot action in Animator](https://discourse.slicer.org/t/new-scene-snapshot-action-in-animator/46821)

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**Author:** [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Replies:** 1\
**Last updated:** [April 26, 2026, 2:21am UTC](https://discourse.slicer.org/t/new-scene-snapshot-action-in-animator/46821 "2026-04-26T02:21:38Z")

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I update the Animator module in SlicerMorph to make use of the SceneView architecture. The old volume rendering, rotation and animation actions were too complicated to use. In this one, you specify the duration of the an…

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## [Sharing custom presets](https://discourse.slicer.org/t/sharing-custom-presets/46690)

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**Author:** [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Replies:** 7\
**Last updated:** [April 23, 2026, 9:18pm UTC](https://discourse.slicer.org/t/sharing-custom-presets/46690 "2026-04-23T21:18:01Z")

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This is something I wanted for the SlicerMorph project for a while and I bite the bullet and asked copilot to create a github repo to share and add presets. As indicated in the contributing.MD you simply add two items t…

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## [Timestamps in the testing dashboard are inconsistent](https://discourse.slicer.org/t/timestamps-in-the-testing-dashboard-are-inconsistent/46815)

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**Author:** [@MaxHoges](https://discourse.slicer.org/u/MaxHoges)\
**Replies:** 0\
**Last updated:** [April 23, 2026, 11:50am UTC](https://discourse.slicer.org/t/timestamps-in-the-testing-dashboard-are-inconsistent/46815 "2026-04-23T11:50:30Z")

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I was just checking out the testing dashboard and noticed that the timestamps in the build overview table don’t match with the timestamps Ince you click through to more details on the build. For example, here’s the view…

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## [New extension pull request awaiting approval](https://discourse.slicer.org/t/new-extension-pull-request-awaiting-approval/46780)

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**Author:** [@MaxHoges](https://discourse.slicer.org/u/MaxHoges)\
**Replies:** 4\
**Last updated:** [April 22, 2026, 4:58pm UTC](https://discourse.slicer.org/t/new-extension-pull-request-awaiting-approval/46780 "2026-04-22T16:58:12Z")

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I recently got my BoneMat extension to a useful state and decided to try adding it to the extensions index. My first pull request to the ExtensionsIndex didn’t pass the extension validation test (which was initiated by a…

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## [Developing a vessel analysis module for 3D Slicer – guidance needed](https://discourse.slicer.org/t/developing-a-vessel-analysis-module-for-3d-slicer-guidance-needed/46762)

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**Author:** [@Benny\_Zamir](https://discourse.slicer.org/u/Benny_Zamir)\
**Replies:** 2\
**Last updated:** [April 18, 2026, 12:34am UTC](https://discourse.slicer.org/t/developing-a-vessel-analysis-module-for-3d-slicer-guidance-needed/46762 "2026-04-18T00:34:24Z")

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Hi, I’ve been working on a Python-based vessel analysis tool and uploaded it here: https://github.com/bz1977/VesselAnalyzer Current status: Branch segmentation and marker placement still need improvement Lesion …

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## [Mac extension builds failing with cout error](https://discourse.slicer.org/t/mac-extension-builds-failing-with-cout-error/46685)

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**Author:** [@pieper](https://discourse.slicer.org/u/pieper)\
**Replies:** 14\
**Last updated:** [April 10, 2026, 7:20pm UTC](https://discourse.slicer.org/t/mac-extension-builds-failing-with-cout-error/46685 "2026-04-10T19:20:50Z")

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We noticed SlicerDMRI and other mac builds today. Looks like python extensions are okay but not C++ ones. Maybe related to the clipboard locale change? @Sam\_Horvath @ebrahim ?

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## [SlicerSeqSeg Extension](https://discourse.slicer.org/t/slicerseqseg-extension/46707)

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**Author:** [@numisveinsson](https://discourse.slicer.org/u/numisveinsson)\
**Replies:** 0\
**Last updated:** [April 10, 2026, 5:29pm UTC](https://discourse.slicer.org/t/slicerseqseg-extension/46707 "2026-04-10T17:29:06Z")

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Hi everyone, I’m sharing SeqSeg, a new 3D Slicer extension for seed-based segmentation of tubular/vascular structures from CT or MR. You place two fiducial seeds and a radius estimate; the module runs the SeqSeg pipelin…

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## [Progress on Passthrough enabled while having SlicerVR open?](https://discourse.slicer.org/t/progress-on-passthrough-enabled-while-having-slicervr-open/46640)

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**Author:** [@zachbrauer15](https://discourse.slicer.org/u/zachbrauer15)\
**Replies:** 2\
**Last updated:** [April 9, 2026, 12:21pm UTC](https://discourse.slicer.org/t/progress-on-passthrough-enabled-while-having-slicervr-open/46640 "2026-04-09T12:21:16Z")

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Hello, My team is currently working on displaying a 3D render of a Clarius Ultrasound image within our Meta Quest 3. We would like to have passthrough enabled at the same time as the slicer module so that the user can v…

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## [Exploring digital membership cards for patient/research access in medical imaging environments](https://discourse.slicer.org/t/exploring-digital-membership-cards-for-patient-research-access-in-medical-imaging-environments/46684)

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**Author:** [@hanblue](https://discourse.slicer.org/u/hanblue)\
**Replies:** 0\
**Last updated:** [April 8, 2026, 2:14pm UTC](https://discourse.slicer.org/t/exploring-digital-membership-cards-for-patient-research-access-in-medical-imaging-environments/46684 "2026-04-08T14:14:45Z")

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Hi everyone, I’ve been thinking about how digital identity and access systems can be improved in medical imaging and research environments, especially in setups where multiple institutions collaborate. In many industri…

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## [Publishing a new Slicer Python extension](https://discourse.slicer.org/t/publishing-a-new-slicer-python-extension/46506)

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**Author:** [@MaxHoges](https://discourse.slicer.org/u/MaxHoges)\
**Replies:** 1\
**Last updated:** [March 19, 2026, 9:19pm UTC](https://discourse.slicer.org/t/publishing-a-new-slicer-python-extension/46506 "2026-03-19T21:19:50Z")

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Hi all, I’ve been developing a Slicer extension in Python over the past 6 months to perform material mapping of Young’s modulus onto meshes from CT data, using Dr Elise Pegg’s project to perform the main material mappin…

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## [2026-03-19 macOS nightly build will be skipped](https://discourse.slicer.org/t/2026-03-19-macos-nightly-build-will-be-skipped/46499)

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**Author:** [@ebrahim](https://discourse.slicer.org/u/ebrahim)\
**Replies:** 1\
**Last updated:** [March 19, 2026, 3:07pm UTC](https://discourse.slicer.org/t/2026-03-19-macos-nightly-build-will-be-skipped/46499 "2026-03-19T15:07:46Z")

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Heads up: computron (macOS) nightly builds may be skipped tonight while we run a clean stable rebuild. Normal nightly schedule should resume tomorrow. The clean stable build should hopefully fix recent issues with insta…

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## [How to get RF data from BK ultrasound devices](https://discourse.slicer.org/t/how-to-get-rf-data-from-bk-ultrasound-devices/31239)

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**Author:** [@Theo](https://discourse.slicer.org/u/Theo)\
**Replies:** 8\
**Last updated:** [March 19, 2026, 8:47am UTC](https://discourse.slicer.org/t/how-to-get-rf-data-from-bk-ultrasound-devices/31239 "2026-03-19T08:47:50Z")

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The slicer I developed and compiled needs to be connected to the BK ultrasound device through the cameralink mode of the plus server initiator to obtain raw RF data. I am not sure how to obtain RF data in the slicer code…

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## [Right-click context menu in slice views](https://discourse.slicer.org/t/right-click-context-menu-in-slice-views/25056)

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**Author:** [@giovform](https://discourse.slicer.org/u/giovform)\
**Replies:** 4\
**Last updated:** [March 18, 2026, 1:10pm UTC](https://discourse.slicer.org/t/right-click-context-menu-in-slice-views/25056 "2026-03-18T13:10:03Z")

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How can I programatically disable (and enable again) the right-click context menu in slice views?

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## [Need to turn of raycast for all segmentation node's except one in 3D view](https://discourse.slicer.org/t/need-to-turn-of-raycast-for-all-segmentation-nodes-except-one-in-3d-view/46464)

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**Author:** [@Victor\_Wayne](https://discourse.slicer.org/u/Victor_Wayne)\
**Replies:** 6\
**Last updated:** [March 18, 2026, 9:24am UTC](https://discourse.slicer.org/t/need-to-turn-of-raycast-for-all-segmentation-nodes-except-one-in-3d-view/46464 "2026-03-18T09:24:53Z")

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Hello, I have a target tissue segmented using the Segment editor. And I have more than 150 ellipsoidal segmentation nodes in the scene and visible in the 3D views. And I have to draw a line on the views. When I draw the…

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## [Grow from seed module paper link outdated](https://discourse.slicer.org/t/grow-from-seed-module-paper-link-outdated/46373)

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**Author:** [@gaoyi.cn](https://discourse.slicer.org/u/gaoyi.cn)\
**Replies:** 1\
**Last updated:** [March 4, 2026, 1:02pm UTC](https://discourse.slicer.org/t/grow-from-seed-module-paper-link-outdated/46373 "2026-03-04T13:02:43Z")

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In the file: Modules/Loadable/Segmentations/EditorEffects/Python/SegmentEditorEffects/SegmentEditorGrowFromSeedsEffect.py: The effect uses fast grow-cut method. Links to the old MICCAI version of the paper. The link i…

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## [How to change the default file format for save](https://discourse.slicer.org/t/how-to-change-the-default-file-format-for-save/46278)

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**Author:** [@Victor\_Wayne](https://discourse.slicer.org/u/Victor_Wayne)\
**Replies:** 2\
**Last updated:** [February 28, 2026, 4:01am UTC](https://discourse.slicer.org/t/how-to-change-the-default-file-format-for-save/46278 "2026-02-28T04:01:31Z")

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Hello, When we click on the save button the default file format for saving a scene is .mrml. Is there any way I can change it to .mrb? Is there a way to edit the config file so that the save data dialog opens with .mrb …

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## [Folder visibility confusing](https://discourse.slicer.org/t/folder-visibility-confusing/23753)

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**Author:** [@fbordignon](https://discourse.slicer.org/u/fbordignon)\
**Replies:** 6\
**Last updated:** [February 25, 2026, 2:26pm UTC](https://discourse.slicer.org/t/folder-visibility-confusing/23753 "2026-02-25T14:26:13Z")

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The eye icon is both loved and hated by our users, but I believe there is a confusing behavior for the folder eye icon. When I close the folder’s eye and have both 2D and 3D renderings, only the 3D hides: To confu…

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