# Development

**URL:** https://discourse.slicer.org/c/dev/5.md?page=40

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

**Page:** 41

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## [Building just the meshing code](https://discourse.slicer.org/t/building-just-the-meshing-code/28121)

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**Author:** [@cesss](https://discourse.slicer.org/u/cesss)\
**Replies:** 0\
**Last updated:** [March 1, 2023, 5:37pm UTC](https://discourse.slicer.org/t/building-just-the-meshing-code/28121 "2023-03-01T17:37:33Z")

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I’m interested in using the VMTK meshing code for my own CFD project. Is there any build procedure for building only the meshing code, and perhaps limiting the required dependencies to just the ones needed by the meshing…

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## [Exporting jpgs of MRI slices](https://discourse.slicer.org/t/exporting-jpgs-of-mri-slices/28057)

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**Author:** [@hchattaway](https://discourse.slicer.org/u/hchattaway)\
**Replies:** 2\
**Last updated:** [February 28, 2023, 3:54pm UTC](https://discourse.slicer.org/t/exporting-jpgs-of-mri-slices/28057 "2023-02-28T15:54:51Z")

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I am looking to do the following… I can write the Python code, but I am new to the 3d-slicer API and just need some guidance… I want to: Load up a folder(s) of nii image files into 3d-slicer… I’ve done this part and s…

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## [How to write an axial/sagittal/coronal slice of a volume to DICOM file using Python script](https://discourse.slicer.org/t/how-to-write-an-axial-sagittal-coronal-slice-of-a-volume-to-dicom-file-using-python-script/28044)

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**Author:** [@anhhtmsc](https://discourse.slicer.org/u/anhhtmsc)\
**Replies:** 4\
**Last updated:** [February 28, 2023, 2:12pm UTC](https://discourse.slicer.org/t/how-to-write-an-axial-sagittal-coronal-slice-of-a-volume-to-dicom-file-using-python-script/28044 "2023-02-28T14:12:36Z")

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Hello everyone, I want to write an axial/sagittal/coronal slice from a loaded volumeNode to a DICOM file using Python script. I tried to get the vtkImageData of the volumeNode and convert it to a sitkImage, then write o…

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## [slicer.modules.segmentations.logic().ImportLabelmapToSegmentationNode() Not workign with given SegmentIDs](https://discourse.slicer.org/t/slicer-modules-segmentations-logic-importlabelmaptosegmentationnode-not-workign-with-given-segmentids/27998)

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**Author:** [@Alex\_Shen](https://discourse.slicer.org/u/Alex_Shen)\
**Replies:** 2\
**Last updated:** [February 23, 2023, 11:09pm UTC](https://discourse.slicer.org/t/slicer-modules-segmentations-logic-importlabelmaptosegmentationnode-not-workign-with-given-segmentids/27998 "2023-02-23T23:09:41Z")

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Hi, having this issue trying to convert labelmap volume to a segmentation node. My labelmap volume here has only 0s and 1s, so theoretically, only one segment will be created running this function. If I run the followi…

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## [Fiducial registration module for SlicerCAT](https://discourse.slicer.org/t/fiducial-registration-module-for-slicercat/27908)

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**Author:** [@Kaubert](https://discourse.slicer.org/u/Kaubert)\
**Replies:** 3\
**Last updated:** [February 23, 2023, 4:01pm UTC](https://discourse.slicer.org/t/fiducial-registration-module-for-slicercat/27908 "2023-02-23T16:01:38Z")

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Hi there, I’m looking for the source code of the module “Fiducial registration” in order to include it in a SlicerCAT build. I know that the module “Fiducial Registration Wizard” from IGT extension is very similar but …

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## [Building custom module inside 3D slicer that contains pre trained models (built in tensorflow)](https://discourse.slicer.org/t/building-custom-module-inside-3d-slicer-that-contains-pre-trained-models-built-in-tensorflow/27929)

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**Author:** [@rahulhere](https://discourse.slicer.org/u/rahulhere)\
**Replies:** 5\
**Last updated:** [February 23, 2023, 2:59pm UTC](https://discourse.slicer.org/t/building-custom-module-inside-3d-slicer-that-contains-pre-trained-models-built-in-tensorflow/27929 "2023-02-23T14:59:31Z")

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Hi All, I have a few pre trained medical image segmentation models built in tensorflow. I would like to build modules which I can use to test their segmentation prediction on scans that I import into 3D slicer. I know t…

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## [Can I block 3d slicer's ability to save data?](https://discourse.slicer.org/t/can-i-block-3d-slicers-ability-to-save-data/27947)

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**Author:** [@dsa934](https://discourse.slicer.org/u/dsa934)\
**Replies:** 4\
**Last updated:** [February 23, 2023, 9:13am UTC](https://discourse.slicer.org/t/can-i-block-3d-slicers-ability-to-save-data/27947 "2023-02-23T09:13:26Z")

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Operating system: window 10 Slicer version: 5.2.1 Hi , slicer users I was wondering if it is possible to block the 3d slicer’s save function to process data that needs to be secure. Is it possible in the same way as …

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## [SlicerCustomAppTemplate Build Error](https://discourse.slicer.org/t/slicercustomapptemplate-build-error/27717)

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**Author:** [@Kaubert](https://discourse.slicer.org/u/Kaubert)\
**Replies:** 4\
**Last updated:** [February 23, 2023, 4:48am UTC](https://discourse.slicer.org/t/slicercustomapptemplate-build-error/27717 "2023-02-23T04:48:06Z")

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Hi there, I am having trouble building SlicerCustomAppTemplate while I am not encountering any errors when building the latest version of Slicer. Here is my configuration: Windows 11 Cmake 3.22.4 Qt 5.15.2 Visual S…

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## [Release of Slicer 5.2.2 in progress](https://discourse.slicer.org/t/release-of-slicer-5-2-2-in-progress/27951)

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**Author:** [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Replies:** 5\
**Last updated:** [February 22, 2023, 11:08pm UTC](https://discourse.slicer.org/t/release-of-slicer-5-2-2-in-progress/27951 "2023-02-22T23:08:25Z")

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This evening, regular preview and stable builds of Slicer and associated extensions will be disabled in favor of a patch release. Fixes to be integrated in the Slicer@5.2 maintenance branch are associated with PR-6782. …

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## [GetNodeByClass(vtkMRMLScalarVolumeNode) returns vtkMRMLMultiVolumeNode](https://discourse.slicer.org/t/getnodebyclass-vtkmrmlscalarvolumenode-returns-vtkmrmlmultivolumenode/27960)

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**Author:** [@pearsonm](https://discourse.slicer.org/u/pearsonm)\
**Replies:** 2\
**Last updated:** [February 22, 2023, 3:32am UTC](https://discourse.slicer.org/t/getnodebyclass-vtkmrmlscalarvolumenode-returns-vtkmrmlmultivolumenode/27960 "2023-02-22T03:32:51Z")

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Hi, I am writing a module to process dynamic nuclear medicine images and I have an issue that might be a bug. I load 2 DICOM datasets as vtkMRMLScalarVolumeNode but another module also creates a vtkMRMLMultiVolumeNode. …

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## [Help on specific type of transforms](https://discourse.slicer.org/t/help-on-specific-type-of-transforms/27955)

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**Author:** [@roshans17](https://discourse.slicer.org/u/roshans17)\
**Replies:** 0\
**Last updated:** [February 21, 2023, 3:57pm UTC](https://discourse.slicer.org/t/help-on-specific-type-of-transforms/27955 "2023-02-21T15:57:12Z")

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Hi all, I was wondering if anyone had insights into the problem I am having. I am trying to transform 15 nodes (bones) by passing in a file that has their respective transformation matrix. An example of the .dat file tha…

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## [Merge CT volume node with a model node in python](https://discourse.slicer.org/t/merge-ct-volume-node-with-a-model-node-in-python/9457)

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**Author:** [@talmazov](https://discourse.slicer.org/u/talmazov)\
**Replies:** 22\
**Last updated:** [February 19, 2023, 9:33pm UTC](https://discourse.slicer.org/t/merge-ct-volume-node-with-a-model-node-in-python/9457 "2023-02-19T21:33:40Z")

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I know 3D slicer can merge two volume/slice nodes from separate CT data but is it possible to merge an PLY/STL loaded model node with a CT volume/slice node?

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## [Processing slows down after many iterations](https://discourse.slicer.org/t/processing-slows-down-after-many-iterations/27910)

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**Author:** [@nrex45](https://discourse.slicer.org/u/nrex45)\
**Replies:** 1\
**Last updated:** [February 19, 2023, 2:18am UTC](https://discourse.slicer.org/t/processing-slows-down-after-many-iterations/27910 "2023-02-19T02:18:05Z")

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Somewhat related question: I’m looping through the following code a couple of hundred times and after a while slicer starts to run slower and slower… based on experience this usually means I’m creating some kind of node …

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## [Media control symbol in button with same style - Play Stop Previous and Next](https://discourse.slicer.org/t/media-control-symbol-in-button-with-same-style-play-stop-previous-and-next/27901)

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**Author:** [@haphantran](https://discourse.slicer.org/u/haphantran)\
**Replies:** 1\
**Last updated:** [February 18, 2023, 2:36pm UTC](https://discourse.slicer.org/t/media-control-symbol-in-button-with-same-style-play-stop-previous-and-next/27901 "2023-02-18T14:36:21Z")

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Hi guys, I’m trying to build an extension that can control the images play back. I made the UI with media control symbol and the timeline slider. I got one problem where I can’t find the set of unicode symbol that rend…

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## [How to open multiple DICOM series using python script](https://discourse.slicer.org/t/how-to-open-multiple-dicom-series-using-python-script/27861)

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**Author:** [@anhhtmsc](https://discourse.slicer.org/u/anhhtmsc)\
**Replies:** 3\
**Last updated:** [February 17, 2023, 3:09pm UTC](https://discourse.slicer.org/t/how-to-open-multiple-dicom-series-using-python-script/27861 "2023-02-17T15:09:06Z")

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Hello everyone, I want to use the WebServer module of 3D Slicer to make a WADO Server. I can load DICOM files into the scene from a folder. I need to open multiple DICOM series simultaneously, then control the volumes t…

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## [CLI XML schema password](https://discourse.slicer.org/t/cli-xml-schema-password/27065)

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**Author:** [@fbordignon](https://discourse.slicer.org/u/fbordignon)\
**Replies:** 6\
**Last updated:** [February 17, 2023, 4:46am UTC](https://discourse.slicer.org/t/cli-xml-schema-password/27065 "2023-02-17T04:46:09Z")

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Greetings everyone. Would it be desirable to have a special XML field for passwords in the CLI XML schema? I have a use case that a CLI calls some functions via paramiko on a ssh connections and the user needs to input…

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## [Custom outputs using SegmentGeometry module](https://discourse.slicer.org/t/custom-outputs-using-segmentgeometry-module/27793)

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**Author:** [@laurabc](https://discourse.slicer.org/u/laurabc)\
**Replies:** 1\
**Last updated:** [February 16, 2023, 2:06pm UTC](https://discourse.slicer.org/t/custom-outputs-using-segmentgeometry-module/27793 "2023-02-16T14:06:40Z")

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Hello community, I have a 3D segment and I want to extract as much information as possible from the cross-sectional cuts along the segment principal axis. SegmentGeometry module is being very useful, thank you @jmhuie f…

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## [Using 3D Slicer as a background service](https://discourse.slicer.org/t/using-3d-slicer-as-a-background-service/27802)

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**Author:** [@GradyC](https://discourse.slicer.org/u/GradyC)\
**Replies:** 4\
**Last updated:** [February 15, 2023, 4:51pm UTC](https://discourse.slicer.org/t/using-3d-slicer-as-a-background-service/27802 "2023-02-15T16:51:50Z")

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Hello, I am currently developing a project where I think 3D Slicer’s rasterization would come in handy. To keep things simple I am developing a 3D printer where we must convert an .STL file to a .TIFF stack. There is ple…

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## [Is it possible to map a general vescular model to individual CT image for preliminary judgement?](https://discourse.slicer.org/t/is-it-possible-to-map-a-general-vescular-model-to-individual-ct-image-for-preliminary-judgement/27693)

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**Author:** [@jay1987](https://discourse.slicer.org/u/jay1987)\
**Replies:** 2\
**Last updated:** [February 15, 2023, 8:10am UTC](https://discourse.slicer.org/t/is-it-possible-to-map-a-general-vescular-model-to-individual-ct-image-for-preliminary-judgement/27693 "2023-02-15T08:10:05Z")

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In some clinical applications, some doctors ask me if there is a way to register blood vessels to the actual patient’s head through AR. I don’t know how to do it. Can someone help me with some suggestions?

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## [Place Fiducial Marker with EndPlacementEvent observer](https://discourse.slicer.org/t/place-fiducial-marker-with-endplacementevent-observer/27797)

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**Author:** [@kleingeo](https://discourse.slicer.org/u/kleingeo)\
**Replies:** 1\
**Last updated:** [February 15, 2023, 5:39am UTC](https://discourse.slicer.org/t/place-fiducial-marker-with-endplacementevent-observer/27797 "2023-02-15T05:39:37Z")

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I am trying to execute a function after a fiducial marker is placed. I was trying to implement it with this: def onMarkupEndInteraction(caller, event): # Do stuff pass interactionNode = slicer.app.applicationLo…

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## [Volume Reslice for Calibrated Ultrasound Images](https://discourse.slicer.org/t/volume-reslice-for-calibrated-ultrasound-images/11546)

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**Author:** [@Winona\_Richey](https://discourse.slicer.org/u/Winona_Richey)\
**Replies:** 4\
**Last updated:** [February 15, 2023, 4:19am UTC](https://discourse.slicer.org/t/volume-reslice-for-calibrated-ultrasound-images/11546 "2023-02-15T04:19:33Z")

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Operating system: Windows 7 and MacOS 10.14.6 Slicer version: 4.10.1 Expected behavior: 1. Set the incoming tracked image as the driver for the corresponding 2D viewer. 2. Find the appropriate mode from the Mode list …

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## [How to find the upper-direction of mesh data ( idea , task, reference anything )](https://discourse.slicer.org/t/how-to-find-the-upper-direction-of-mesh-data-idea-task-reference-anything/27737)

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**Author:** [@dsa934](https://discourse.slicer.org/u/dsa934)\
**Replies:** 1\
**Last updated:** [February 15, 2023, 3:57am UTC](https://discourse.slicer.org/t/how-to-find-the-upper-direction-of-mesh-data-idea-task-reference-anything/27737 "2023-02-15T03:57:30Z")

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Operating system: window 10 Slicer version: 5.2.1 I have several mesh data files (.ply), and the orientation of objects in these files is always random. like this : With the goal of having all meshes have the same…

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## [How to make one model node unselectable](https://discourse.slicer.org/t/how-to-make-one-model-node-unselectable/27721)

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**Author:** [@jay1987](https://discourse.slicer.org/u/jay1987)\
**Replies:** 4\
**Last updated:** [February 10, 2023, 10:38am UTC](https://discourse.slicer.org/t/how-to-make-one-model-node-unselectable/27721 "2023-02-10T10:38:54Z")

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when i move the fiducial point, i want to move the point on the suface of the head ,but when close to the tube,the point attach to the tube , is it possible to make the tube unselectable use code? i understand move th…

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## [How to write data into regedit in slicer?](https://discourse.slicer.org/t/how-to-write-data-into-regedit-in-slicer/27736)

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**Author:** [@jay1987](https://discourse.slicer.org/u/jay1987)\
**Replies:** 2\
**Last updated:** [February 10, 2023, 10:37am UTC](https://discourse.slicer.org/t/how-to-write-data-into-regedit-in-slicer/27736 "2023-02-10T10:37:02Z")

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i have made a simple application use 3dslicer , and wants to write some data into regedit but write data into regedit in win10 need administrator privileges i have tryed some code in netword and in chatgpt,it doesn’t w…

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## [Upload works from slicer's python console (server)](https://discourse.slicer.org/t/upload-works-from-slicers-python-console-server/27718)

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**Author:** [@dsa934](https://discourse.slicer.org/u/dsa934)\
**Replies:** 1\
**Last updated:** [February 9, 2023, 1:16pm UTC](https://discourse.slicer.org/t/upload-works-from-slicers-python-console-server/27718 "2023-02-09T13:16:14Z")

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Operating system: window 11 Slicer version: 5.2.1 I am using a private sftp server to store data. The data I handle is sensitive to security, so I can’t experiment easily, so I’m asking a question because I want to ge…

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## [How to find the closest mesh to a specific markups point (algorithm , idea )](https://discourse.slicer.org/t/how-to-find-the-closest-mesh-to-a-specific-markups-point-algorithm-idea/27715)

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**Author:** [@dsa934](https://discourse.slicer.org/u/dsa934)\
**Replies:** 3\
**Last updated:** [February 9, 2023, 11:32am UTC](https://discourse.slicer.org/t/how-to-find-the-closest-mesh-to-a-specific-markups-point-algorithm-idea/27715 "2023-02-09T11:32:08Z")

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Operating system: window 10 Slicer version: 5.2.1 hi Slicer users I want to get only the position value of the inner mesh closest to the center point of this mesh. Can anyone recommend an idea or algorithm?

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## [Detect subject hierarchy node deletion before its children get deleted](https://discourse.slicer.org/t/detect-subject-hierarchy-node-deletion-before-its-children-get-deleted/27517)

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**Author:** [@Albi](https://discourse.slicer.org/u/Albi)\
**Replies:** 1\
**Last updated:** [February 9, 2023, 9:59am UTC](https://discourse.slicer.org/t/detect-subject-hierarchy-node-deletion-before-its-children-get-deleted/27517 "2023-02-09T09:59:45Z")

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In a custom module I would like to detect the deletion of an item to take appropriate action before its children gets deleted. I observed that the signal SubjectHierarchyItemAboutToBeRemovedEvent of the item is emitted a…

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## [How to setup slicer's web server?](https://discourse.slicer.org/t/how-to-setup-slicers-web-server/27696)

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**Author:** [@dsa934](https://discourse.slicer.org/u/dsa934)\
**Replies:** 5\
**Last updated:** [February 9, 2023, 5:01am UTC](https://discourse.slicer.org/t/how-to-setup-slicers-web-server/27696 "2023-02-09T05:01:02Z")

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Operating system: window 10 Slicer version: 5.2.1 HI , slicer users I need to create a communication module that works on slicer. I have never done network coding before. So I’m trying to do a toy project that turns …

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## [Create a paint brush](https://discourse.slicer.org/t/create-a-paint-brush/27652)

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**Author:** [@devD](https://discourse.slicer.org/u/devD)\
**Replies:** 1\
**Last updated:** [February 8, 2023, 8:55pm UTC](https://discourse.slicer.org/t/create-a-paint-brush/27652 "2023-02-08T20:55:24Z")

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Hi, I am making an extension. I want to add one button to it which creates a paint brush with optional diameter (such as the one that exists in Segment Editor), the only thing it should return is the area in pixels in w…

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## [Did sitkUtils.PullVolumeFromSlicer() break with Slicer 5.2?](https://discourse.slicer.org/t/did-sitkutils-pullvolumefromslicer-break-with-slicer-5-2/26863)

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**Author:** [@Alex\_Gilman](https://discourse.slicer.org/u/Alex_Gilman)\
**Replies:** 9\
**Last updated:** [February 7, 2023, 2:00pm UTC](https://discourse.slicer.org/t/did-sitkutils-pullvolumefromslicer-break-with-slicer-5-2/26863 "2023-02-07T14:00:50Z")

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Under Ubuntu 20.04, sitkUtils.PullVolumeFromSlicer() works fine in Slicer 5.0.3. In 5.2.1 and later, the call consistently raises an error: File "/bin/slicer5.2.1/Slicer-5.2.1-linux-amd64/bin/Python/sitkUtils.py", lin…

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