# Development

**URL:** https://discourse.slicer.org/c/dev/5.md?no_subcategories=false&page=54

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

**Page:** 55

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## [How to display crosshairs in a single window. For example: the crosshair disappears when a single window is enlarged](https://discourse.slicer.org/t/how-to-display-crosshairs-in-a-single-window-for-example-the-crosshair-disappears-when-a-single-window-is-enlarged/23593)

<div class="topic-metadata">

**Author:** [@janus\_zhu](https://discourse.slicer.org/u/janus_zhu)\
**Replies:** 3\
**Last updated:** [May 28, 2022, 4:39am UTC](https://discourse.slicer.org/t/how-to-display-crosshairs-in-a-single-window-for-example-the-crosshair-disappears-when-a-single-window-is-enlarged/23593 "2022-05-28T04:39:45Z")

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How to display crosshairs in a single window. For example: the crosshair disappears when a single window is enlarged. thanks

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## [Optimizing performance of events when clearing nodes](https://discourse.slicer.org/t/optimizing-performance-of-events-when-clearing-nodes/23588)

<div class="topic-metadata">

**Author:** [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)\
**Replies:** 18\
**Last updated:** [May 27, 2022, 2:22am UTC](https://discourse.slicer.org/t/optimizing-performance-of-events-when-clearing-nodes/23588 "2022-05-27T02:22:48Z")

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I often have about 100 hundred volumes loaded into the scene with corresponding segmentations for each of those volumes. When clearing nodes I’ve observed varying performance based on how many times the current selection…

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## [How to retrieve modeltomodel values by coordinates?](https://discourse.slicer.org/t/how-to-retrieve-modeltomodel-values-by-coordinates/23431)

<div class="topic-metadata">

**Author:** [@K\_Tilman](https://discourse.slicer.org/u/K_Tilman)\
**Replies:** 3\
**Last updated:** [May 25, 2022, 5:30pm UTC](https://discourse.slicer.org/t/how-to-retrieve-modeltomodel-values-by-coordinates/23431 "2022-05-25T17:30:16Z")

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Hey there! Currently I am using the ModelToModelDistance module on two models, which outputs a third model which I have been analyzing using the ShapePopulationView module. This colormap is somewhat useful in itself bu…

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## [Extension dependencies in custom apps](https://discourse.slicer.org/t/extension-dependencies-in-custom-apps/23552)

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**Author:** [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Replies:** 7\
**Last updated:** [May 24, 2022, 9:43pm UTC](https://discourse.slicer.org/t/extension-dependencies-in-custom-apps/23552 "2022-05-24T21:43:49Z")

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Hi all, Recently the SlicerIGT extension added a dependency to SlicerIGSIO. This is all good, but it made me face a situation in a custom app that I haven’t had to deal with before. If an extension depends on another o…

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## [Upgrading Endoscopy extension with camera interpolation](https://discourse.slicer.org/t/upgrading-endoscopy-extension-with-camera-interpolation/23546)

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**Author:** [@jadh4v](https://discourse.slicer.org/u/jadh4v)\
**Replies:** 6\
**Last updated:** [May 24, 2022, 4:29pm UTC](https://discourse.slicer.org/t/upgrading-endoscopy-extension-with-camera-interpolation/23546 "2022-05-24T16:29:37Z")

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In our work towards developing a camera flythrough visualization for a Slicer based custom application VPAW, we are considering keyframe interpolation of camera poses for creating a flythrough. We considered multiple e…

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## [Problem with Slicer built in release mode on Windows](https://discourse.slicer.org/t/problem-with-slicer-built-in-release-mode-on-windows/23534)

<div class="topic-metadata">

**Author:** [@olevs](https://discourse.slicer.org/u/olevs)\
**Replies:** 1\
**Last updated:** [May 24, 2022, 11:07am UTC](https://discourse.slicer.org/t/problem-with-slicer-built-in-release-mode-on-windows/23534 "2022-05-24T11:07:24Z")

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Hi, Building Slicer in release mode with Visual Studio Community 2022 (Qt 5.15.2) gives some errors when trying to run the application. I’ve tested this with the 5.0.2 Slicer git tag. Starting Slicer gives the followin…

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## [Packaging error for custom markups module](https://discourse.slicer.org/t/packaging-error-for-custom-markups-module/23523)

<div class="topic-metadata">

**Author:** [@chir.set](https://discourse.slicer.org/u/chir.set)\
**Replies:** 2\
**Last updated:** [May 23, 2022, 7:45am UTC](https://discourse.slicer.org/t/packaging-error-for-custom-markups-module/23523 "2022-05-23T07:45:39Z")

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Hi, One library is missing during packaging while building a custom markups module, which fails to show when installed with the extensions manager pointing to a local \*.gz package. The build directory lib/Slicer-5.1/qt…

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## [Howto customize the position of the Interaction handles of a lineNode?](https://discourse.slicer.org/t/howto-customize-the-position-of-the-interaction-handles-of-a-linenode/23518)

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**Author:** [@jumbojing](https://discourse.slicer.org/u/jumbojing)\
**Replies:** 1\
**Last updated:** [May 23, 2022, 4:16am UTC](https://discourse.slicer.org/t/howto-customize-the-position-of-the-interaction-handles-of-a-linenode/23518 "2022-05-23T04:16:14Z")

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By default the position of the Interaction handles on the lineNode is at the midpoint, but howto place the Interaction handles in a custom location? Like this:

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## [Why clone a line node without display properties?](https://discourse.slicer.org/t/why-clone-a-line-node-without-display-properties/19922)

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**Author:** [@jumbojing](https://discourse.slicer.org/u/jumbojing)\
**Replies:** 9\
**Last updated:** [May 21, 2022, 2:04am UTC](https://discourse.slicer.org/t/why-clone-a-line-node-without-display-properties/19922 "2022-05-21T02:04:16Z")

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Why clone a line node without display properties? 克隆一条直线为啥不带显示属性呢?

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## [Custom derived markups to draw a ring : request for review, comments](https://discourse.slicer.org/t/custom-derived-markups-to-draw-a-ring-request-for-review-comments/23425)

<div class="topic-metadata">

**Author:** [@chir.set](https://discourse.slicer.org/u/chir.set)\
**Replies:** 2\
**Last updated:** [May 20, 2022, 3:43pm UTC](https://discourse.slicer.org/t/custom-derived-markups-to-draw-a-ring-request-for-review-comments/23425 "2022-05-20T15:43:37Z")

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@lassoan @cpinter @pieper @jamesobutler @coreDevs This custom markups uses a base markups line to draw a ring in 2 modes. The first control point of the base line is the center of the ring, and the line’s length is i…

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## [Issues building Slicer on Arch Linux](https://discourse.slicer.org/t/issues-building-slicer-on-arch-linux/23470)

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**Author:** [@tsims](https://discourse.slicer.org/u/tsims)\
**Replies:** 3\
**Last updated:** [May 18, 2022, 7:49pm UTC](https://discourse.slicer.org/t/issues-building-slicer-on-arch-linux/23470 "2022-05-18T19:49:37Z")

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Hi everyone, I am having some issues installing slicer and was hoping to get some help… When I go to build the latest version of Slicer, I get the following error: In file included from /home/tsims/Documents/Slicer-git…

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## [Issue with qSlicerWebWidget in python scripted extensions](https://discourse.slicer.org/t/issue-with-qslicerwebwidget-in-python-scripted-extensions/23413)

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**Author:** [@im\_catta](https://discourse.slicer.org/u/im_catta)\
**Replies:** 4\
**Last updated:** [May 17, 2022, 1:48pm UTC](https://discourse.slicer.org/t/issue-with-qslicerwebwidget-in-python-scripted-extensions/23413 "2022-05-17T13:48:06Z")

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If want to generate a pdf file using the qSlicerWebWidget I can simply type in the Python Interactor something like w = slicer.qSlicerWebWidget() w.webView().url = qt.QUrl("https://www.slicer.org/") w.printToPdf(r"C:\\fo…

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## [Ways to Fix Video Lag Issue with Plus Server](https://discourse.slicer.org/t/ways-to-fix-video-lag-issue-with-plus-server/21894)

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**Author:** [@Srijeet\_Chatterjee](https://discourse.slicer.org/u/Srijeet_Chatterjee)\
**Replies:** 7\
**Last updated:** [May 17, 2022, 7:12am UTC](https://discourse.slicer.org/t/ways-to-fix-video-lag-issue-with-plus-server/21894 "2022-05-17T07:12:59Z")

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Hi everyone, I am trying to record videos (.mkv format) using the PlusServerRemoteControl.exe from two different epiphan framegrabbers. I find that there is a lag in the recorded videos when I am playing it. Can anyone …

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## [Linked control behavior of ThreeDViews with different view groups: linked control ignores view group setup?](https://discourse.slicer.org/t/linked-control-behavior-of-threedviews-with-different-view-groups-linked-control-ignores-view-group-setup/23383)

<div class="topic-metadata">

**Author:** [@mrlongzhang](https://discourse.slicer.org/u/mrlongzhang)\
**Replies:** 2\
**Last updated:** [May 16, 2022, 12:55pm UTC](https://discourse.slicer.org/t/linked-control-behavior-of-threedviews-with-different-view-groups-linked-control-ignores-view-group-setup/23383 "2022-05-16T12:55:20Z")

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Here is my settings: A customized layout with 3 three-D Views. The view group of the first one is 0. And the rest two are assigned to be 1. Using the following code: viewNode = slicer.mrmlScene.GetSingletonNode('1', 'vt…

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## [Howto delete all nodes by 'nodeName\*'?](https://discourse.slicer.org/t/howto-delete-all-nodes-by-nodename/23423)

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**Author:** [@jumbojing](https://discourse.slicer.org/u/jumbojing)\
**Replies:** 2\
**Last updated:** [May 16, 2022, 4:40am UTC](https://discourse.slicer.org/t/howto-delete-all-nodes-by-nodename/23423 "2022-05-16T04:40:24Z")

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我想删除所有的nodes通过nodeName\* 或者 slicer.util.getNodes(‘x\*’), 我该咋做呢? 注意⚠️: 其中有同名的node I want to delete all nodes via ‘nodeName\*’ or slicer.util.getNodes('x\*'), what should I do? Note⚠️: There are some nodes with the sa…

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## [Adding points to Point List Markup becomes progressively slower](https://discourse.slicer.org/t/adding-points-to-point-list-markup-becomes-progressively-slower/23419)

<div class="topic-metadata">

**Author:** [@Karl\_Hahn](https://discourse.slicer.org/u/Karl_Hahn)\
**Replies:** 3\
**Last updated:** [May 15, 2022, 2:47am UTC](https://discourse.slicer.org/t/adding-points-to-point-list-markup-becomes-progressively-slower/23419 "2022-05-15T02:47:51Z")

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Adding points to Point List Markup becomes progressively slower. It reached multiple seconds to add a point after about 30 points. This does not occur when adding points to e.g. a closed curve. Please let me know if I c…

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## [Wrong OPENSSL\_INCLUDE\_DIR during SlicerCAT build on WIndows](https://discourse.slicer.org/t/wrong-openssl-include-dir-during-slicercat-build-on-windows/23393)

<div class="topic-metadata">

**Author:** [@keri](https://discourse.slicer.org/u/keri)\
**Replies:** 2\
**Last updated:** [May 12, 2022, 7:17pm UTC](https://discourse.slicer.org/t/wrong-openssl-include-dir-during-slicercat-build-on-windows/23393 "2022-05-12T19:17:02Z")

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Hi, I’m trying to build SlicerCAT with SlicerJupyter bundled using clean build on WIndows with VS 2022. Thus xeus depends on OpenSSL: ExternalProject\_Add\_Dependencies(xeus DEPENDS OpenSSL ) But during xeus co…

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## [Dicom volumes do not appear in the inputselector](https://discourse.slicer.org/t/dicom-volumes-do-not-appear-in-the-inputselector/23388)

<div class="topic-metadata">

**Author:** [@Linhsia\_Noferini](https://discourse.slicer.org/u/Linhsia_Noferini)\
**Replies:** 4\
**Last updated:** [May 12, 2022, 1:55pm UTC](https://discourse.slicer.org/t/dicom-volumes-do-not-appear-in-the-inputselector/23388 "2022-05-12T13:55:39Z")

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Operating system: windows Slicer version: 4.11 Expected behavior: we are using the extension wizard, “create module”. The default generated inputselector should accept any volume from the scene, indipendently from the …

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## [Changing the background color of slice views](https://discourse.slicer.org/t/changing-the-background-color-of-slice-views/16151)

<div class="topic-metadata">

**Author:** [@giovform](https://discourse.slicer.org/u/giovform)\
**Replies:** 9\
**Last updated:** [May 12, 2022, 12:54pm UTC](https://discourse.slicer.org/t/changing-the-background-color-of-slice-views/16151 "2022-05-12T12:54:20Z")

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I am not being able to change de slice views background colors. I am doing this: viewNode = slicer.app.layoutManager().sliceWidget('Red').mrmlSliceNode() viewNode.SetBackgroundColor(1,1,1) viewNode.SetBackgroundColor2(1…

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## [SimpleITK install fails on Windows](https://discourse.slicer.org/t/simpleitk-install-fails-on-windows/23373)

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**Author:** [@keri](https://discourse.slicer.org/u/keri)\
**Replies:** 11\
**Last updated:** [May 12, 2022, 12:02pm UTC](https://discourse.slicer.org/t/simpleitk-install-fails-on-windows/23373 "2022-05-12T12:02:07Z")

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Hi, I just tried Slicer 3D master branch clean build on Windows 11, VS 2022 and I get error: Performing install step for 'SimpleITK' -- SimpleITK: Removing 'install' log files -- SimpleITK: SimpleITK\_WORKING\_DIR:…

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## [Error during generation with Visual Studio](https://discourse.slicer.org/t/error-during-generation-with-visual-studio/23345)

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**Author:** [@Shoshoda](https://discourse.slicer.org/u/Shoshoda)\
**Replies:** 8\
**Last updated:** [May 12, 2022, 3:43am UTC](https://discourse.slicer.org/t/error-during-generation-with-visual-studio/23345 "2022-05-12T03:43:02Z")

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Hello everyone, I’m new to 3d slicer so maybe I’m doing it wrong but this is the error I get : I tried several time to build the project with CMAKE and Visual Studio on two differents computers(Windows 10 and 11) R…

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## [Error when custom building Slicer RT](https://discourse.slicer.org/t/error-when-custom-building-slicer-rt/23313)

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**Author:** [@cay18](https://discourse.slicer.org/u/cay18)\
**Replies:** 2\
**Last updated:** [May 12, 2022, 2:40am UTC](https://discourse.slicer.org/t/error-when-custom-building-slicer-rt/23313 "2022-05-12T02:40:28Z")

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Hello, I managed to build Slicer from Source and am trying to do the same for SlicerRT to use it as an extension. I followed the instructions here and successfully generated the project using CMake-GUI. But when I try to…

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## [Convert an extension into standalone application](https://discourse.slicer.org/t/convert-an-extension-into-standalone-application/23371)

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**Author:** [@Mrwa\_Awoda](https://discourse.slicer.org/u/Mrwa_Awoda)\
**Replies:** 3\
**Last updated:** [May 12, 2022, 2:03am UTC](https://discourse.slicer.org/t/convert-an-extension-into-standalone-application/23371 "2022-05-12T02:03:05Z")

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Operating system: windows 10 Slicer version: 4.13 Actual behavior: Is it possible to convert an extension into standalone application and works with no need to install the 3D Slicer in my computer? I tried to build t…

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## [inquiry on volume rendering results](https://discourse.slicer.org/t/inquiry-on-volume-rendering-results/23356)

<div class="topic-metadata">

**Author:** [@harrykwon0524](https://discourse.slicer.org/u/harrykwon0524)\
**Replies:** 1\
**Last updated:** [May 10, 2022, 4:16am UTC](https://discourse.slicer.org/t/inquiry-on-volume-rendering-results/23356 "2022-05-10T04:16:18Z")

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Hello everyone. I am new to the 3D slicer program, and I have been trying to create the volume rendering result. It seems like the rendering is working, but my concern is the result is not being placed inside the pink bo…

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## [Error during generation with Visual Studio](https://discourse.slicer.org/t/error-during-generation-with-visual-studio/23346)

<div class="topic-metadata">

**Author:** [@Shoshoda](https://discourse.slicer.org/u/Shoshoda)\
**Replies:** 0\
**Last updated:** [May 9, 2022, 1:04pm UTC](https://discourse.slicer.org/t/error-during-generation-with-visual-studio/23346 "2022-05-09T13:04:57Z")

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Hello everyone, I’m new to 3d slicer so maybe I’m doing it wrong but this is the error I get : I tried several time to build the project with CMAKE and Visual Studio on two differents computers(Windows 10 and 11) R…

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## [Joint Smoothing in Slicer 4.13 works incorrectly ](https://discourse.slicer.org/t/joint-smoothing-in-slicer-4-13-works-incorrectly/23326)

<div class="topic-metadata">

**Author:** [@Volha](https://discourse.slicer.org/u/Volha)\
**Replies:** 1\
**Last updated:** [May 8, 2022, 10:47pm UTC](https://discourse.slicer.org/t/joint-smoothing-in-slicer-4-13-works-incorrectly/23326 "2022-05-08T22:47:02Z")

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Hello! I do the following: run Slicer4.13=\> Segment Editor=\> Smoothing =\> Joint smoothing (1.0) =\> apply. I get the result: But in Slice v4.11 result is different: Please explain what has changed in Slicer v4.13 co…

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## [Availability of Slicer 5.0 on ArchLinux](https://discourse.slicer.org/t/availability-of-slicer-5-0-on-archlinux/23245)

<div class="topic-metadata">

**Author:** [@Alex\_Vergara](https://discourse.slicer.org/u/Alex_Vergara)\
**Replies:** 26\
**Last updated:** [May 6, 2022, 10:56pm UTC](https://discourse.slicer.org/t/availability-of-slicer-5-0-on-archlinux/23245 "2022-05-06T22:56:53Z")

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Manjaro here (from AUR, so I asume the same for all pacman based linux) :: 1 Packages to upgrade. 1 aur/3dslicer-nightly-bin 4.13.0.r20220113-1 -\> 20220501.071714-1 ==\> Packages to exclude: (eg: "1 2 3", "1-3", "^4" o…

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## [Display a segmentation in color over the segmented volume - loadable module](https://discourse.slicer.org/t/display-a-segmentation-in-color-over-the-segmented-volume-loadable-module/292)

<div class="topic-metadata">

**Author:** [@sandra](https://discourse.slicer.org/u/sandra)\
**Replies:** 12\
**Last updated:** [May 6, 2022, 11:50am UTC](https://discourse.slicer.org/t/display-a-segmentation-in-color-over-the-segmented-volume-loadable-module/292 "2022-05-06T11:50:56Z")

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Operating system: MAC Slicer version: 4.6.2 Hi everyone, I am currently writting my own loadable module and I would need to segment a volume (for example by thresholding it) and display the segmentation in color over…

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## [Restart Slicer button or menu shortcut](https://discourse.slicer.org/t/restart-slicer-button-or-menu-shortcut/13202)

<div class="topic-metadata">

**Author:** [@ezgimercan](https://discourse.slicer.org/u/ezgimercan)\
**Replies:** 5\
**Last updated:** [May 6, 2022, 10:02am UTC](https://discourse.slicer.org/t/restart-slicer-button-or-menu-shortcut/13202 "2022-05-06T10:02:14Z")

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Just wondering if there are plans to add a shortcut menu item for researting Slicer? I often find myself closing the app and re-openning it during the development of a module or even using modules under development. I am…

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## [qMRMLPlotView embedded in UI](https://discourse.slicer.org/t/qmrmlplotview-embedded-in-ui/7538)

<div class="topic-metadata">

**Author:** [@holmesrb](https://discourse.slicer.org/u/holmesrb)\
**Replies:** 0\
**Last updated:** [July 11, 2019, 6:43pm UTC](https://discourse.slicer.org/t/qmrmlplotview-embedded-in-ui/7538 "2019-07-11T18:43:54Z")

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Hi I would like to have a plot displayed on a module user interface rather than within the main layout. The code examples add a vtkMRMLPlotChartNode and then switch to a layout that contains a plot view. I have tried c…

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