# Development

**URL:** https://discourse.slicer.org/c/dev/5.md?no_subcategories=false&page=109

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

**Page:** 110

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## [MatlabBridge inputvolume format](https://discourse.slicer.org/t/matlabbridge-inputvolume-format/6558)

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**Author:** [@Cincy](https://discourse.slicer.org/u/Cincy)\
**Replies:** 1\
**Last updated:** [April 22, 2019, 7:03pm UTC](https://discourse.slicer.org/t/matlabbridge-inputvolume-format/6558 "2019-04-22T19:03:47Z")

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Operating system:win10 Slicer version:4.10.0 Expected behavior: Actual behavior: Hello, I’m Cincy.emmm…I have a question about using MatlabBridge.I want to know if I can give the File path directly as input volume,…

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## [Updating slicer to work with python 3](https://discourse.slicer.org/t/updating-slicer-to-work-with-python-3/4662)

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**Author:** [@kayarre](https://discourse.slicer.org/u/kayarre)\
**Replies:** 16\
**Last updated:** [April 19, 2019, 6:00pm UTC](https://discourse.slicer.org/t/updating-slicer-to-work-with-python-3/4662 "2019-04-19T18:00:26Z")

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I am interested in having slicer work with python 3 as I am already using python 3 in other parts of my workflow, and would be nice to not have make my scripts compatible across both. I have heard that this is planned b…

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## [Errors while loading Slicer nightly](https://discourse.slicer.org/t/errors-while-loading-slicer-nightly/6540)

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**Author:** [@Alex\_Vergara](https://discourse.slicer.org/u/Alex_Vergara)\
**Replies:** 2\
**Last updated:** [April 19, 2019, 12:49pm UTC](https://discourse.slicer.org/t/errors-while-loading-slicer-nightly/6540 "2019-04-19T12:49:39Z")

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When I start nightly these errors appear in debug console: \[DEBUG\]\[Qt\] 17.04.2019 17:11:18 \[\] (unknown:0) - Session start time .......: 2019-04-17 17:11:18 \[DEBUG\]\[Qt\] 17.04.2019 17:11:18 \[\] (unknown:0) - Slicer version…

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## [Sample data download failure](https://discourse.slicer.org/t/sample-data-download-failure/6536)

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**Author:** [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Replies:** 1\
**Last updated:** [April 18, 2019, 6:44pm UTC](https://discourse.slicer.org/t/sample-data-download-failure/6536 "2019-04-18T18:44:23Z")

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Sample data fails to download data from MIDAS. The browser shows some php code instead of downloading the image: @jcfr @Sam\_Horvath

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## [CMake Configure OpenSSL Error](https://discourse.slicer.org/t/cmake-configure-openssl-error/6506)

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**Author:** [@marcmclean](https://discourse.slicer.org/u/marcmclean)\
**Replies:** 22\
**Last updated:** [April 17, 2019, 2:18pm UTC](https://discourse.slicer.org/t/cmake-configure-openssl-error/6506 "2019-04-17T14:18:02Z")

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When generating Slicer solution files, I get the following error: CMake Error at SuperBuild/External\_OpenSSL.cmake:241 (message): There is no pre-compiled version of OpenSSL 1.0.1h available for this version of visual…

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## [MRML node removal callback](https://discourse.slicer.org/t/mrml-node-removal-callback/6514)

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**Author:** [@michalikthomas](https://discourse.slicer.org/u/michalikthomas)\
**Replies:** 1\
**Last updated:** [April 16, 2019, 5:03pm UTC](https://discourse.slicer.org/t/mrml-node-removal-callback/6514 "2019-04-16T17:03:26Z")

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How to correctly register a callback for MRML node removal (specifically vtkMRMLModelNode and vtkMRMLMarkupsFiducialNode) in python scripted module?

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## [Slicer QA Dashboard: Updated UI](https://discourse.slicer.org/t/slicer-qa-dashboard-updated-ui/6511)

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**Author:** [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Replies:** 0\
**Last updated:** [April 16, 2019, 1:56pm UTC](https://discourse.slicer.org/t/slicer-qa-dashboard-updated-ui/6511 "2019-04-16T13:56:54Z")

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The CDash team has been working on modernizing the CDash UI and we just updated the Slicer dashboards. After: Before:

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## [SlicerRT not compatible with nightly](https://discourse.slicer.org/t/slicerrt-not-compatible-with-nightly/6504)

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**Author:** [@Alex\_Vergara](https://discourse.slicer.org/u/Alex_Vergara)\
**Replies:** 7\
**Last updated:** [April 16, 2019, 1:39pm UTC](https://discourse.slicer.org/t/slicerrt-not-compatible-with-nightly/6504 "2019-04-16T13:39:17Z")

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When installing SlicerRT it says File “/Users/alex/Applications/Slicer.app/Contents/Extensions-28138/SlicerRT/lib/Slicer-4.11/qt-scripted-modules/BatchStructureSetConversion.py”, line 233 except Exception, e: ^ Synta…

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## [SlicerElastix not compatible with nightly](https://discourse.slicer.org/t/slicerelastix-not-compatible-with-nightly/6505)

<div class="topic-metadata">

**Author:** [@Alex\_Vergara](https://discourse.slicer.org/u/Alex_Vergara)\
**Replies:** 4\
**Last updated:** [April 16, 2019, 1:03am UTC](https://discourse.slicer.org/t/slicerelastix-not-compatible-with-nightly/6505 "2019-04-16T01:03:12Z")

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When installing SlicerElastix it says File “/Users/alex/Applications/Slicer.app/Contents/Extensions-28138/SlicerElastix/lib/Slicer-4.11/qt-scripted-modules/Elastix.py”, line 330 print e ^ SyntaxError: Missing parenth…

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## [Unable to pass island selection coordinate to Islands effect by python script](https://discourse.slicer.org/t/unable-to-pass-island-selection-coordinate-to-islands-effect-by-python-script/3747)

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**Author:** [@devakumar](https://discourse.slicer.org/u/devakumar)\
**Replies:** 7\
**Last updated:** [April 15, 2019, 4:55pm UTC](https://discourse.slicer.org/t/unable-to-pass-island-selection-coordinate-to-islands-effect-by-python-script/3747 "2019-04-15T16:55:18Z")

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Dear Development team, I appreciate your work on the segment editor effects. I am trying to select an island from the selected segmentation by python script. I am using the following code. # Keep the selected islan…

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## [Selecting Compiler](https://discourse.slicer.org/t/selecting-compiler/6503)

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**Author:** [@marcmclean](https://discourse.slicer.org/u/marcmclean)\
**Replies:** 1\
**Last updated:** [April 15, 2019, 3:13pm UTC](https://discourse.slicer.org/t/selecting-compiler/6503 "2019-04-15T15:13:15Z")

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I’m attempting to compile Slicer from source. The Slicer documentation states to not configure until after selecting your compiler. In CMake GUI, the only way I see to specify the compiler is to click the Configure but…

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## [Single markup fiducial event listener](https://discourse.slicer.org/t/single-markup-fiducial-event-listener/6455)

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**Author:** [@michalikthomas](https://discourse.slicer.org/u/michalikthomas)\
**Replies:** 1\
**Last updated:** [April 11, 2019, 8:03pm UTC](https://discourse.slicer.org/t/single-markup-fiducial-event-listener/6455 "2019-04-11T20:03:23Z")

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Is there any way how to observe events for a single markup fiducial? My goal is to detect a change of fiducial position.

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## [SlicerDcm2nii extension not visible in Extension Manager despite successful build](https://discourse.slicer.org/t/slicerdcm2nii-extension-not-visible-in-extension-manager-despite-successful-build/6435)

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**Author:** [@ljod](https://discourse.slicer.org/u/ljod)\
**Replies:** 3\
**Last updated:** [April 11, 2019, 4:18pm UTC](https://discourse.slicer.org/t/slicerdcm2nii-extension-not-visible-in-extension-manager-despite-successful-build/6435 "2019-04-11T16:18:42Z")

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Hi we are trying to make the SlicerDCM2nii extension (https://github.com/SlicerDMRI/SlicerDcm2nii) available again to users. It has built successfully on Mac (with a few warnings but no errors) and Linux (no warnings), b…

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## [Updating minimum required version of CMake to 3.13](https://discourse.slicer.org/t/updating-minimum-required-version-of-cmake-to-3-13/6012)

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**Author:** [@phcerdan](https://discourse.slicer.org/u/phcerdan)\
**Replies:** 6\
**Last updated:** [April 9, 2019, 2:59pm UTC](https://discourse.slicer.org/t/updating-minimum-required-version-of-cmake-to-3-13/6012 "2019-04-09T14:59:02Z")

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We plan on updating the minimum required version of CMake to 3.13, this will allow simplifying a lot of CMake logic. It is a good opportunity to update now while we are working toward Slicer 5 which will introduce C++11…

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## [Customize Sound effect to Virtual reality environment](https://discourse.slicer.org/t/customize-sound-effect-to-virtual-reality-environment/5011)

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**Author:** [@M\_pavi](https://discourse.slicer.org/u/M_pavi)\
**Replies:** 2\
**Last updated:** [April 6, 2019, 2:26am UTC](https://discourse.slicer.org/t/customize-sound-effect-to-virtual-reality-environment/5011 "2019-04-06T02:26:43Z")

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Hi, I just want to add specific sound files to my VR environment. I installed sound control extension. Also, I am following below steps :slight\_smile: Installation: Install PureData - How to install pureData ??? …

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## [SlicerRT does not build due to missing ITK remote module](https://discourse.slicer.org/t/slicerrt-does-not-build-due-to-missing-itk-remote-module/6214)

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**Author:** [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Replies:** 23\
**Last updated:** [April 1, 2019, 1:22pm UTC](https://discourse.slicer.org/t/slicerrt-does-not-build-due-to-missing-itk-remote-module/6214 "2019-04-01T13:22:51Z")

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SlicerRT does not build for a few days, since ITK was upgraded to version 5. The dashboard currently shows a trivial Plastimatch configuration error (saying that only ITK 3 and 4 are supported),the bigger problem is with…

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## [Python scripted module code organization](https://discourse.slicer.org/t/python-scripted-module-code-organization/6339)

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**Author:** [@michalikthomas](https://discourse.slicer.org/u/michalikthomas)\
**Replies:** 1\
**Last updated:** [March 31, 2019, 4:36am UTC](https://discourse.slicer.org/t/python-scripted-module-code-organization/6339 "2019-03-31T04:36:45Z")

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What is the recommended way to distribute and initiate source code in a scripted module - separating code into multiple files? I am not sure about importing files. When I add \_\_init\_\_.py into a scripted module folder to…

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## [Center a volume in 3D scene](https://discourse.slicer.org/t/center-a-volume-in-3d-scene/6318)

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**Author:** [@Alex1](https://discourse.slicer.org/u/Alex1)\
**Replies:** 3\
**Last updated:** [March 31, 2019, 4:17am UTC](https://discourse.slicer.org/t/center-a-volume-in-3d-scene/6318 "2019-03-31T04:17:00Z")

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Hi, I want to center a certain volume in the 3D view. I tried layoutManager = slicer.app.layoutManager() threeDWidget = layoutManager.threeDWidget(0) threeDView = threeDWidget.threeDView() threeDView.resetFocalPoint(…

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## [Export images from DICOM images](https://discourse.slicer.org/t/export-images-from-dicom-images/6324)

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**Author:** [@ZiyunLiang](https://discourse.slicer.org/u/ZiyunLiang)\
**Replies:** 1\
**Last updated:** [March 28, 2019, 1:48pm UTC](https://discourse.slicer.org/t/export-images-from-dicom-images/6324 "2019-03-28T13:48:38Z")

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Hi, I’m having some problems reading a dicom file. I wish to find a certain image from the dicom file. The image came from the sagittal(yellow) slice, and the coordinate has the smallest absolute value. (What I mean by ‘…

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## [Visual Studio 2015 Build Fail](https://discourse.slicer.org/t/visual-studio-2015-build-fail/6133)

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**Author:** [@triple\_axel](https://discourse.slicer.org/u/triple_axel)\
**Replies:** 7\
**Last updated:** [March 14, 2019, 4:54pm UTC](https://discourse.slicer.org/t/visual-studio-2015-build-fail/6133 "2019-03-14T16:54:36Z")

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Machine: Windows 10 Compiler: “Visual Studio 14 2015” Hi, I am having issues attempting to build the latest stable version of Slicer (Slicer 4.10.1). I have attempted git cloning, configuring, generating, and building …

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## [.rodata can not be used when making a PIE object](https://discourse.slicer.org/t/rodata-can-not-be-used-when-making-a-pie-object/6313)

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**Author:** [@Zhiy](https://discourse.slicer.org/u/Zhiy)\
**Replies:** 2\
**Last updated:** [March 28, 2019, 4:46pm UTC](https://discourse.slicer.org/t/rodata-can-not-be-used-when-making-a-pie-object/6313 "2019-03-28T16:46:55Z")

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Hi, I am building Slicer in ubuntu 18.04. I followed every step in https://www.slicer.org/wiki/Documentation/Nightly/Developers/Build\_Instructions#Linux. But now I run into a build error: /usr/bin/ld: CMakeFiles/vtkPars…

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## [rodata can not be used when making a PIE object](https://discourse.slicer.org/t/rodata-can-not-be-used-when-making-a-pie-object/6314)

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**Author:** [@Zhiy](https://discourse.slicer.org/u/Zhiy)\
**Replies:** 0\
**Last updated:** [March 28, 2019, 2:59am UTC](https://discourse.slicer.org/t/rodata-can-not-be-used-when-making-a-pie-object/6314 "2019-03-28T02:59:58Z")

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Dear all, Any one built Slicer with gcc/g++ 7.3 before. I am hitting errors like /usr/bin/ld: CMakeFiles/vtkParseJava.dir/vtkParseJava.c.o: relocation R\_X86\_64\_32 against .rodata' can not be used when making a PIE obje…

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## [Downtime for CDash instances Wednesday, 2019/3/27 at 1pm](https://discourse.slicer.org/t/downtime-for-cdash-instances-wednesday-2019-3-27-at-1pm/6289)

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**Author:** [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Replies:** 1\
**Last updated:** [March 27, 2019, 8:37pm UTC](https://discourse.slicer.org/t/downtime-for-cdash-instances-wednesday-2019-3-27-at-1pm/6289 "2019-03-27T20:37:05Z")

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Hi Folks, You should expect downtime associated with http://slicer.cdash.org/ tomorrow. CDash instances will be offline Wednesday, 3/7 at 1pm for roughly 1 hour while the associated database server is upgraded. Externa…

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## [Using Reformat in python](https://discourse.slicer.org/t/using-reformat-in-python/6279)

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**Author:** [@Alex1](https://discourse.slicer.org/u/Alex1)\
**Replies:** 2\
**Last updated:** [March 26, 2019, 8:23am UTC](https://discourse.slicer.org/t/using-reformat-in-python/6279 "2019-03-26T08:23:26Z")

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Hi all, I hope to rotate my red slice and I found out that Reformat is the perfect choice. However, when I try to use it from a Python scripted module. I cannot find the function from reformat.logic or reformat widget. …

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## [How can I draw a coordinate system on the image?](https://discourse.slicer.org/t/how-can-i-draw-a-coordinate-system-on-the-image/6205)

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**Author:** [@ZiyunLiang](https://discourse.slicer.org/u/ZiyunLiang)\
**Replies:** 25\
**Last updated:** [March 25, 2019, 9:39am UTC](https://discourse.slicer.org/t/how-can-i-draw-a-coordinate-system-on-the-image/6205 "2019-03-25T09:39:15Z")

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Hi everyone, I am currently working on a project related to pelvic floor MRI images recognition. I have already recognized a feature point and a reference line in a scripted module. And I’m trying to build a new coordin…

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## [Volume rendering presets](https://discourse.slicer.org/t/volume-rendering-presets/6255)

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**Author:** [@erlendb](https://discourse.slicer.org/u/erlendb)\
**Replies:** 1\
**Last updated:** [March 23, 2019, 5:53pm UTC](https://discourse.slicer.org/t/volume-rendering-presets/6255 "2019-03-23T17:53:33Z")

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Hi! I’m trying to understand the values in the preset file used in Volume Rendering. The preset file is found by searching “preset” in …Program Files/slicer… For instance, why is there 5 values in gradientOpacity, and…

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## [Working directory of Slicer](https://discourse.slicer.org/t/working-directory-of-slicer/6248)

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**Author:** [@Alex1](https://discourse.slicer.org/u/Alex1)\
**Replies:** 4\
**Last updated:** [March 22, 2019, 4:00pm UTC](https://discourse.slicer.org/t/working-directory-of-slicer/6248 "2019-03-22T16:00:01Z")

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Hi, I always have the problem with the working directory of Slicer. when I use nrrd.write(filename,data) I have no idea where my filename.nrrd is stored. And everytime I try to load a model or file to Slicer, the …

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## [Segmentation and modeling of MRI image](https://discourse.slicer.org/t/segmentation-and-modeling-of-mri-image/6238)

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**Author:** [@ZiyunLiang](https://discourse.slicer.org/u/ZiyunLiang)\
**Replies:** 13\
**Last updated:** [March 22, 2019, 1:37pm UTC](https://discourse.slicer.org/t/segmentation-and-modeling-of-mri-image/6238 "2019-03-22T13:37:38Z")

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Hi, I want to implement the segmentation of bladder from pelvic floor MRI images and then implement 3D reconstruction of the organ in a python scripted module. I currently created a model which can predict by each pixe…

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## [Load image to a model](https://discourse.slicer.org/t/load-image-to-a-model/6237)

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**Author:** [@Alex1](https://discourse.slicer.org/u/Alex1)\
**Replies:** 2\
**Last updated:** [March 21, 2019, 6:19pm UTC](https://discourse.slicer.org/t/load-image-to-a-model/6237 "2019-03-21T18:19:42Z")

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Hi all, Sorry to bother you with my question. I’m new to Slicer and I’m trying to write a scripted python module. I’m trying to recognize MRI images by a deep-learning model. I have already loaded my model and I’m now t…

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## [Improve description of nightly build on download.slicer.org](https://discourse.slicer.org/t/improve-description-of-nightly-build-on-download-slicer-org/6754)

<div class="topic-metadata">

**Author:** [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Replies:** 2\
**Last updated:** [March 21, 2019, 3:55pm UTC](https://discourse.slicer.org/t/improve-description-of-nightly-build-on-download-slicer-org/6754 "2019-03-21T15:55:48Z")

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Should we add a note to the download page that nightly build is only recommended for developers until further notice? @pieper @jcfr @fedorov

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