# Development

**URL:** https://discourse.slicer.org/c/dev/5.md?page=123

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

**Page:** 124

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## [Waiting popup (for 3dslicer extension)](https://discourse.slicer.org/t/waiting-popup-for-3dslicer-extension/1965)

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**Author:** [@Frederic](https://discourse.slicer.org/u/Frederic)\
**Replies:** 4\
**Last updated:** [January 29, 2018, 3:02pm UTC](https://discourse.slicer.org/t/waiting-popup-for-3dslicer-extension/1965 "2018-01-29T15:02:29Z")

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Hi all, I am creating 3dslicer module. It’s why I would know if you already have developed a “waiting popup” to indicate that calculating is occurring? Thanks in advance.

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## [Loadable module crashing binary Slicer](https://discourse.slicer.org/t/loadable-module-crashing-binary-slicer/1900)

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**Author:** [@kanderle](https://discourse.slicer.org/u/kanderle)\
**Replies:** 7\
**Last updated:** [January 29, 2018, 10:34am UTC](https://discourse.slicer.org/t/loadable-module-crashing-binary-slicer/1900 "2018-01-29T10:34:01Z")

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I have an error with my loadable module. I’ve built the Slicer stable version (revision 26489) and I’ve built my module against it without errors. The module works as intended when I launch the built Slicer version. Howe…

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## [Slicer's Python module picks up system numpy](https://discourse.slicer.org/t/slicers-python-module-picks-up-system-numpy/1063)

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**Author:** [@dzenanz](https://discourse.slicer.org/u/dzenanz)\
**Replies:** 8\
**Last updated:** [January 25, 2018, 11:23pm UTC](https://discourse.slicer.org/t/slicers-python-module-picks-up-system-numpy/1063 "2018-01-25T23:23:35Z")

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I did a clean build of a recent version (9e9decc80e1bb922459799a260c558fc4ee90b06) yesterday. Build completed without errors. But when I try to run it, DICOMScalarVolumePlugin.py picks up system numpy which prevents some…

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## [Slicer main UI freezes during python scripted module execution](https://discourse.slicer.org/t/slicer-main-ui-freezes-during-python-scripted-module-execution/1906)

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**Author:** [@Milogav](https://discourse.slicer.org/u/Milogav)\
**Replies:** 6\
**Last updated:** [January 25, 2018, 7:05pm UTC](https://discourse.slicer.org/t/slicer-main-ui-freezes-during-python-scripted-module-execution/1906 "2018-01-25T19:05:02Z")

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Hi Slicer developers, I’m currently developing a python module that performs quite heavy computation over image volumes. The module computations work as expected giving correct results. However, the main slicer window …

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## [vtkDebugLeaks in slicelet](https://discourse.slicer.org/t/vtkdebugleaks-in-slicelet/550)

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**Author:** [@jks1995](https://discourse.slicer.org/u/jks1995)\
**Replies:** 15\
**Last updated:** [January 24, 2018, 1:06am UTC](https://discourse.slicer.org/t/vtkdebugleaks-in-slicelet/550 "2018-01-24T01:06:04Z")

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When I close my slicelete I always get an error box that says "vtkDebugLeaks has detected LEAKS!" and it lists a bunch of node types that still have instances. I am programming in python and I am not sure the proper way …

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## [Implementing this research paper to automate CBCT bone segmentation](https://discourse.slicer.org/t/implementing-this-research-paper-to-automate-cbct-bone-segmentation/1893)

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**Author:** [@George\_Chao](https://discourse.slicer.org/u/George_Chao)\
**Replies:** 1\
**Last updated:** [January 22, 2018, 1:14pm UTC](https://discourse.slicer.org/t/implementing-this-research-paper-to-automate-cbct-bone-segmentation/1893 "2018-01-22T13:14:31Z")

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Operating system: Windows/Linux Slicer version:4.9 hi guys, this is way over my head, can expert look into this paper and see if this can be made into a module? Thanks Automated segmentation of dental CBCT image with…

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## [Vtk python does not import on today's windows nightly](https://discourse.slicer.org/t/vtk-python-does-not-import-on-todays-windows-nightly/1868)

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**Author:** [@pieper](https://discourse.slicer.org/u/pieper)\
**Replies:** 16\
**Last updated:** [January 22, 2018, 5:28am UTC](https://discourse.slicer.org/t/vtk-python-does-not-import-on-todays-windows-nightly/1868 "2018-01-22T05:28:14Z")

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Today’s nightly windows Slicer starts, but all scripted modules are broken. Today’s nightly on mac works fine for me, as does 4.8.1 on the same windows machine. The first error message is: \>\>\> import vtk Traceback (mo…

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## [OSX Slicer Qt5 packaging error](https://discourse.slicer.org/t/osx-slicer-qt5-packaging-error/1468)

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**Author:** [@danielbr](https://discourse.slicer.org/u/danielbr)\
**Replies:** 6\
**Last updated:** [January 19, 2018, 4:33pm UTC](https://discourse.slicer.org/t/osx-slicer-qt5-packaging-error/1468 "2018-01-19T16:33:03Z")

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Having trouble packaging a slicer build on my mac OSX high sierra machine. I installed Qt 5.9.2 using the prebuilt binary installed using the Qt open-source download from the Qt website. I successfully built the latest…

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## [Splitting a segment into fragments](https://discourse.slicer.org/t/splitting-a-segment-into-fragments/1221)

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**Author:** [@moselhy](https://discourse.slicer.org/u/moselhy)\
**Replies:** 9\
**Last updated:** [January 18, 2018, 10:34pm UTC](https://discourse.slicer.org/t/splitting-a-segment-into-fragments/1221 "2018-01-18T22:34:11Z")

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Hello, I would like to split a segment into three and get rid of the first and second fragment. The segment is of a leg so we can assume that the length is always the greater dimension, which is helpful when finding the…

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## [Segment visibilities are not saved in the mrml file](https://discourse.slicer.org/t/segment-visibilities-are-not-saved-in-the-mrml-file/1820)

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**Author:** [@MMMPPPMMM](https://discourse.slicer.org/u/MMMPPPMMM)\
**Replies:** 6\
**Last updated:** [January 18, 2018, 4:14pm UTC](https://discourse.slicer.org/t/segment-visibilities-are-not-saved-in-the-mrml-file/1820 "2018-01-18T16:14:07Z")

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I have a segmentation with two segments. I disable the visability of the 2nd segment in the data module. I save the scene. If Ioad the scene again, both segments are visible

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## [Master with Qt5 build fails](https://discourse.slicer.org/t/master-with-qt5-build-fails/1849)

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**Author:** [@adamrankin](https://discourse.slicer.org/u/adamrankin)\
**Replies:** 3\
**Last updated:** [January 16, 2018, 12:47pm UTC](https://discourse.slicer.org/t/master-with-qt5-build-fails/1849 "2018-01-16T12:47:06Z")

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Cloned Slicer master (b748b88cefa57bc126f3a5c64a4fb59c28e4bb9b) and tried to build with Qt 5.9.1. Received many generation errors similar to: CMake Error at Libs/vtkAddon/CMakeLists.txt:94 (add\_library): Cannot f…

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## [How can we avoid removing all VTK directories when updating slicer](https://discourse.slicer.org/t/how-can-we-avoid-removing-all-vtk-directories-when-updating-slicer/1840)

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**Author:** [@ihnorton](https://discourse.slicer.org/u/ihnorton)\
**Replies:** 2\
**Last updated:** [January 15, 2018, 8:46am UTC](https://discourse.slicer.org/t/how-can-we-avoid-removing-all-vtk-directories-when-updating-slicer/1840 "2018-01-15T08:46:06Z")

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(@chir.set asked the following in Commit 69e26835e would burn my discrete GPU!) Secondly, I need your advice for another issue. Every time I run 'git checkout ', I must remove completely VTKv9{,-build,-prefix} directo…

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## [No ExperimentalUpload target when building extension index](https://discourse.slicer.org/t/no-experimentalupload-target-when-building-extension-index/1818)

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**Author:** [@gregsharp.geo](https://discourse.slicer.org/u/gregsharp.geo)\
**Replies:** 2\
**Last updated:** [January 12, 2018, 1:41pm UTC](https://discourse.slicer.org/t/no-experimentalupload-target-when-building-extension-index/1818 "2018-01-12T13:41:34Z")

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Hi, I am trying to upload the extension using the method here: https://www.slicer.org/wiki/Documentation/Nightly/Developers/Build\_ExtensionsIndex But I don’t get a target for ExperimentalUpload. Is the documentation u…

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## [Early VR interaction papers on PRESENCE Journal](https://discourse.slicer.org/t/early-vr-interaction-papers-on-presence-journal/1815)

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**Author:** [@curtislisle](https://discourse.slicer.org/u/curtislisle)\
**Replies:** 1\
**Last updated:** [January 12, 2018, 6:21am UTC](https://discourse.slicer.org/t/early-vr-interaction-papers-on-presence-journal/1815 "2018-01-12T06:21:51Z")

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During the VR interaction session at the recent Project Week, we discussed interaction modes. I was reminded of early research by some former colleagues at Univ. of Central Florida. Here is a URL and Bibliography to so…

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## [Jsonschema integration](https://discourse.slicer.org/t/jsonschema-integration/1817)

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**Author:** [@che85](https://discourse.slicer.org/u/che85)\
**Replies:** 1\
**Last updated:** [January 11, 2018, 10:05pm UTC](https://discourse.slicer.org/t/jsonschema-integration/1817 "2018-01-11T22:05:29Z")

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Hi there, I would like to know, if you are planning to integrate jsonschema into Slicer? https://pypi.python.org/pypi/jsonschema Christian

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## [Using GLSL post-process (2D) pixel shader with Slicer](https://discourse.slicer.org/t/using-glsl-post-process-2d-pixel-shader-with-slicer/1789)

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**Author:** [@jdx-john](https://discourse.slicer.org/u/jdx-john)\
**Replies:** 4\
**Last updated:** [January 10, 2018, 10:05pm UTC](https://discourse.slicer.org/t/using-glsl-post-process-2d-pixel-shader-with-slicer/1789 "2018-01-10T22:05:32Z")

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I assume this is a dev rather than user question, that we cannot do it using an extension? We have some GLSL shaders used to post-process a textured quad. In our application we use this in conjunction with 3D rendering …

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## [\[MSVC\] CMAKE\_CXX\_MP\_FLAG default value](https://discourse.slicer.org/t/msvc-cmake-cxx-mp-flag-default-value/1786)

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**Author:** [@adamrankin](https://discourse.slicer.org/u/adamrankin)\
**Replies:** 5\
**Last updated:** [January 8, 2018, 9:09pm UTC](https://discourse.slicer.org/t/msvc-cmake-cxx-mp-flag-default-value/1786 "2018-01-08T21:09:14Z")

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Hello, Just wanted to start a conversation around the default value of CMAKE\_CXX\_MP\_FLAG on MSVC builds. Would there be any objection to setting it to ON? Adam

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## [OpenIGTLinkIF as server to receive tracking data](https://discourse.slicer.org/t/openigtlinkif-as-server-to-receive-tracking-data/1766)

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**Author:** [@terajnol](https://discourse.slicer.org/u/terajnol)\
**Replies:** 3\
**Last updated:** [January 8, 2018, 2:15pm UTC](https://discourse.slicer.org/t/openigtlinkif-as-server-to-receive-tracking-data/1766 "2018-01-08T14:15:45Z")

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Hi all, Still working on the PlusToolkit for my Xsens IMU. Because it is not that easy for me, I also try to work in parallel directly with the OpenIGTLink library (to get a functionnal prototype faster). I am trying t…

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## [Individual export files](https://discourse.slicer.org/t/individual-export-files/1743)

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**Author:** [@ihnorton](https://discourse.slicer.org/u/ihnorton)\
**Replies:** 3\
**Last updated:** [December 30, 2017, 10:12pm UTC](https://discourse.slicer.org/t/individual-export-files/1743 "2017-12-30T22:12:05Z")

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I was wondering about the export header files created for targets built by the SlicerMacroBuild\* suite of cmake scripts. Is there a reason for all of these to be separate and configured? Slicer-build$ find ./ -name \*Exp…

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## [Model vtk file name problem in Slicer 4.7 and 4.9](https://discourse.slicer.org/t/model-vtk-file-name-problem-in-slicer-4-7-and-4-9/1728)

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**Author:** [@BlueOctopus](https://discourse.slicer.org/u/BlueOctopus)\
**Replies:** 7\
**Last updated:** [December 28, 2017, 5:55am UTC](https://discourse.slicer.org/t/model-vtk-file-name-problem-in-slicer-4-7-and-4-9/1728 "2017-12-28T05:55:34Z")

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Hi! I have found some error in 3D Slicer V4.7 and V4.9 In MRML file making after updating some scenes, they make vtk file name incorrectly. As like So error message occured in Python console. ReadDataInternal: mo…

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## [Strategies to link Slicer 3D with a navigation system](https://discourse.slicer.org/t/strategies-to-link-slicer-3d-with-a-navigation-system/1721)

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**Author:** [@terajnol](https://discourse.slicer.org/u/terajnol)\
**Replies:** 5\
**Last updated:** [December 26, 2017, 3:29pm UTC](https://discourse.slicer.org/t/strategies-to-link-slicer-3d-with-a-navigation-system/1721 "2017-12-26T15:29:58Z")

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Operating system: Win 10, 64bits Slicer version: 4.9 Hi everyone, I possess an inertial unit system (from Xsens company) to track motion (especially rotation angles) of a device and I would like to connect it to Slice…

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## [Get filename of loaded volume](https://discourse.slicer.org/t/get-filename-of-loaded-volume/1699)

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**Author:** [@spring](https://discourse.slicer.org/u/spring)\
**Replies:** 7\
**Last updated:** [December 21, 2017, 3:29pm UTC](https://discourse.slicer.org/t/get-filename-of-loaded-volume/1699 "2017-12-21T15:29:59Z")

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Operating system: MS windows 10 64bit Slicer version: 4.9.0 Expected behavior: not report error of NoneType Actual behavior: failed at NoneType error Hi developers, I just found this error in Slicer 4.9.0, not sure …

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## [Extension configuration failing](https://discourse.slicer.org/t/extension-configuration-failing/1696)

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**Author:** [@dzenanz](https://discourse.slicer.org/u/dzenanz)\
**Replies:** 2\
**Last updated:** [December 21, 2017, 2:58pm UTC](https://discourse.slicer.org/t/extension-configuration-failing/1696 "2017-12-21T14:58:49Z")

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When trying to configure this extension, I run into the below errors. While the extension is a few years old, the errors don’t seem overly related to it, cropping up in VTK’s CMake code. Any ideas how to resolve this? F…

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## [Are VS2015 builds more verbose?](https://discourse.slicer.org/t/are-vs2015-builds-more-verbose/1693)

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**Author:** [@ihnorton](https://discourse.slicer.org/u/ihnorton)\
**Replies:** 1\
**Last updated:** [December 20, 2017, 10:16pm UTC](https://discourse.slicer.org/t/are-vs2015-builds-more-verbose/1693 "2017-12-20T22:16:03Z")

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This is admittedly very anecdotal, but I’m curious if the Visual Studio 2015 (+Qt5, CMake 3.9.4) builds are known to be somewhat slower and much chattier than VS2013. For one example, while doing a build of the Slicer ta…

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## [Comparing Vector Images in my Tests (using itkTestMain.h)](https://discourse.slicer.org/t/comparing-vector-images-in-my-tests-using-itktestmain-h/1684)

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**Author:** [@mschwier](https://discourse.slicer.org/u/mschwier)\
**Replies:** 6\
**Last updated:** [December 20, 2017, 6:54pm UTC](https://discourse.slicer.org/t/comparing-vector-images-in-my-tests-using-itktestmain-h/1684 "2017-12-20T18:54:48Z")

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I am using itkTestMain.h as parent for module tests. However, I also need to compare Vector Images against their baseline and this is apparently not supported because the images are cast to double. Did I overlook someth…

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## [Cdash: no macOS builds?](https://discourse.slicer.org/t/cdash-no-macos-builds/1682)

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**Author:** [@che85](https://discourse.slicer.org/u/che85)\
**Replies:** 4\
**Last updated:** [December 20, 2017, 5:31am UTC](https://discourse.slicer.org/t/cdash-no-macos-builds/1682 "2017-12-20T05:31:16Z")

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Hi there, seems like there are some issues with the builds? There are no macOS builds listed on cdash. I just wanted to install an extension from Slicer ExtensionManager, but it told me that a dependency was not found. …

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## [Transition to VTK 8.0](https://discourse.slicer.org/t/transition-to-vtk-8-0/379)

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**Author:** [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Replies:** 8\
**Last updated:** [December 12, 2017, 11:48pm UTC](https://discourse.slicer.org/t/transition-to-vtk-8-0/379 "2017-12-12T23:48:20Z")

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Hi All, Just to let you know we are working on updating the version of VTK used in Slicer to use the latest VTK version. As soon as a branch is ready for testing, I will follow up here. It will include the follow steps…

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## [vtkFSLookupTable::MapValue signature changed](https://discourse.slicer.org/t/vtkfslookuptable-mapvalue-signature-changed/1640)

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**Author:** [@dzenanz](https://discourse.slicer.org/u/dzenanz)\
**Replies:** 8\
**Last updated:** [December 12, 2017, 11:28pm UTC](https://discourse.slicer.org/t/vtkfslookuptable-mapvalue-signature-changed/1640 "2017-12-12T23:28:20Z")

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I get this compile error with hash xxx: 55\>c:\\dev\\slicer\\libs\\freesurfer\\vtkFSLookupTable.h(84): error C2555: 'vtkFSLookupTable::MapValue': overriding virtual function return type differs and is not covariant from 'vtkL…

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## [Put a fan-shaped mask to an image displayed in a slice view](https://discourse.slicer.org/t/put-a-fan-shaped-mask-to-an-image-displayed-in-a-slice-view/1644)

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**Author:** [@urbancsaba](https://discourse.slicer.org/u/urbancsaba)\
**Replies:** 3\
**Last updated:** [December 12, 2017, 5:40pm UTC](https://discourse.slicer.org/t/put-a-fan-shaped-mask-to-an-image-displayed-in-a-slice-view/1644 "2017-12-12T17:40:15Z")

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Hi Folks, I have a CT volume displayed axially in a slice view. On this volume I perform different kind of algorithms (this is not the point now) to produce ultrasound-like images. My question is, how can I apply a mas…

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## [Popup menu in displayablemanager](https://discourse.slicer.org/t/popup-menu-in-displayablemanager/1443)

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**Author:** [@PaulMartinMurphy](https://discourse.slicer.org/u/PaulMartinMurphy)\
**Replies:** 3\
**Last updated:** [December 11, 2017, 9:01pm UTC](https://discourse.slicer.org/t/popup-menu-in-displayablemanager/1443 "2017-12-11T21:01:44Z")

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Hi all, I’m trying to develop a Slicer module in which right clicking within a 2d slice view will generate a popup menu. I’m implementing this functionality in DisplayableManager. I haven’t found a VTK object that impl…

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