# Development

**URL:** https://discourse.paraview.org/c/development/6.md?no_subcategories=false&page=20

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

**Page:** 21

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## [Groups of cells in unstructured grid](https://discourse.paraview.org/t/groups-of-cells-in-unstructured-grid/7919)

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**Author:** [@Sagues](https://discourse.paraview.org/u/Sagues)\
**Replies:** 1\
**Last updated:** [September 2, 2021, 1:40pm UTC](https://discourse.paraview.org/t/groups-of-cells-in-unstructured-grid/7919 "2021-09-02T13:40:04Z")

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If I have this unstructured grid like this: vtkNew ugrid; ugrid-\>Allocate(100); ugrid-\>InsertNextCell(VTK\_HEXAHEDRON, 8, pts\[0\]); ugrid-\>InsertNextCell(VTK\_HEXAHEDRON, 8, pts\[1\]); ugrid-\>InsertNextCell(VTK\_TETRA, 4,…

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## [Creating customized Clip filter using VTKPythonAlgorithmBase plugin on MultiBlockDataSet](https://discourse.paraview.org/t/creating-customized-clip-filter-using-vtkpythonalgorithmbase-plugin-on-multiblockdataset/7908)

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**Author:** [@csniker](https://discourse.paraview.org/u/csniker)\
**Replies:** 0\
**Last updated:** [September 1, 2021, 8:12pm UTC](https://discourse.paraview.org/t/creating-customized-clip-filter-using-vtkpythonalgorithmbase-plugin-on-multiblockdataset/7908 "2021-09-01T20:12:34Z")

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My ultimate goal is to develop a Clip filter wherein the user can specify three node IDs, and a Clip will be generated from the plane defined by the coordinate locations of those three nodes. So far I have succeeded in …

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## [Calculate mangitude (of vector) in programmable filter](https://discourse.paraview.org/t/calculate-mangitude-of-vector-in-programmable-filter/7884)

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**Author:** [@massisenergy](https://discourse.paraview.org/u/massisenergy)\
**Replies:** 0\
**Last updated:** [August 28, 2021, 12:30pm UTC](https://discourse.paraview.org/t/calculate-mangitude-of-vector-in-programmable-filter/7884 "2021-08-28T12:30:37Z")

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I would like to calculate magnitude of a vector in the programmable filter. It’s possible to use the expression mag(U) in the python calculator filter but there is one drawback. However, python calculator can only take o…

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## [vtkDataCache: caching data to avoid duplicate computation](https://discourse.paraview.org/t/vtkdatacache-caching-data-to-avoid-duplicate-computation/7871)

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**Author:** [@utkarsh.ayachit](https://discourse.paraview.org/u/utkarsh.ayachit)\
**Replies:** 8\
**Last updated:** [August 27, 2021, 2:49pm UTC](https://discourse.paraview.org/t/vtkdatacache-caching-data-to-avoid-duplicate-computation/7871 "2021-08-27T14:49:23Z")

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Consider this simple pipeline: reader → calculator. As the user is constructing this pipeline the geometry filter – which is automatically executed to generate polygons for rendering – executes twice on the same geometry…

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## [Favorite panel in the file picker](https://discourse.paraview.org/t/favorite-panel-in-the-file-picker/7790)

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**Author:** [@timothee.chabat](https://discourse.paraview.org/u/timothee.chabat)\
**Replies:** 7\
**Last updated:** [August 27, 2021, 2:15pm UTC](https://discourse.paraview.org/t/favorite-panel-in-the-file-picker/7790 "2021-08-27T14:15:13Z")

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ParaView currently embed 2 panel on the left of the file picker : the upper left is default folders from the system (eg Downloads, Documents, home, …) and the lower left are recent folders. Feature : Add the possibility…

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## [CMake Paraview Config Fail for not found FiltersParallelDIY2 in my plugin project since 5.9](https://discourse.paraview.org/t/cmake-paraview-config-fail-for-not-found-filtersparalleldiy2-in-my-plugin-project-since-5-9/7860)

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**Author:** [@ymjia](https://discourse.paraview.org/u/ymjia)\
**Replies:** 7\
**Last updated:** [August 25, 2021, 8:24am UTC](https://discourse.paraview.org/t/cmake-paraview-config-fail-for-not-found-filtersparalleldiy2-in-my-plugin-project-since-5-9/7860 "2021-08-25T08:24:23Z")

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I build ParaView 5.9.1 from source and need to compile plugin project in my PC. cmake configuration of plugin project give me the error message: The following imported targets are referenced, but are missing: VTK::Fil…

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## [Datasets to evaluate ParaView algorithms](https://discourse.paraview.org/t/datasets-to-evaluate-paraview-algorithms/7825)

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**Author:** [@mdorier](https://discourse.paraview.org/u/mdorier)\
**Replies:** 4\
**Last updated:** [August 21, 2021, 4:48pm UTC](https://discourse.paraview.org/t/datasets-to-evaluate-paraview-algorithms/7825 "2021-08-21T16:48:53Z")

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For research purpose I have made some changes in ParaView’s code, and I would like to test whether these changes bring any performance improvement at scale on large datasets. So my question is: does the ParaView communit…

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## [Python Plugin: Decorator Ordering](https://discourse.paraview.org/t/python-plugin-decorator-ordering/7813)

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**Author:** [@Jared\_Blanchard](https://discourse.paraview.org/u/Jared_Blanchard)\
**Replies:** 1\
**Last updated:** [August 12, 2021, 6:54pm UTC](https://discourse.paraview.org/t/python-plugin-decorator-ordering/7813 "2021-08-12T18:54:07Z")

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I’ve noticed when I add decorators in a plugin, they do not appear in the same order they appear in the code. Is there a way to determine the ordering of the decorators, maybe some sort of priority variable?

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## [TextureMapToSphere in Python Plugin](https://discourse.paraview.org/t/texturemaptosphere-in-python-plugin/7798)

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**Author:** [@Jared\_Blanchard](https://discourse.paraview.org/u/Jared_Blanchard)\
**Replies:** 2\
**Last updated:** [August 11, 2021, 2:04pm UTC](https://discourse.paraview.org/t/texturemaptosphere-in-python-plugin/7798 "2021-08-11T14:04:18Z")

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I would like to display a texture maps on spheres as part of a new source class, PythonSolarSystemSource. The plugin currently creates 8 vtkSphereSource() objects and animates them in orbit about the origin. I can manual…

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## [XML styling](https://discourse.paraview.org/t/xml-styling/7793)

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**Author:** [@mwestphal](https://discourse.paraview.org/u/mwestphal)\
**Replies:** 4\
**Last updated:** [August 11, 2021, 1:57pm UTC](https://discourse.paraview.org/t/xml-styling/7793 "2021-08-11T13:57:20Z")

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XML styling in ParaView is a bit all over the place, I wonder if we should (1) defined a style to be respected among developpers, (2) add a automatic check in gitlab to ensure it is respected and (3) run a script to fix …

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## [RuledSurfaceFilter using vtkmodules](https://discourse.paraview.org/t/ruledsurfacefilter-using-vtkmodules/7773)

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**Author:** [@Jared\_Blanchard](https://discourse.paraview.org/u/Jared_Blanchard)\
**Replies:** 1\
**Last updated:** [August 11, 2021, 12:39am UTC](https://discourse.paraview.org/t/ruledsurfacefilter-using-vtkmodules/7773 "2021-08-11T00:39:40Z")

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I’ve gotten stuck trying to use the RuledSurfaceFilter inside one of my python plugins. I have been writing standalone code using import vtk based on this example: RuledSurfaceFilter.py (2.5 KB). This works great. Now…

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## [gitlab.kitware.com expected downtime August 10, 5:30PM ET](https://discourse.paraview.org/t/gitlab-kitware-com-expected-downtime-august-10-5-30pm-et/7797)

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**Author:** [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)\
**Replies:** 1\
**Last updated:** [August 10, 2021, 11:00pm UTC](https://discourse.paraview.org/t/gitlab-kitware-com-expected-downtime-august-10-5-30pm-et/7797 "2021-08-10T23:00:09Z")

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gitlab.kitware.com will be offline for maintenance starting at 5:30pm ET today, August 10, 2021. A process that takes an unknown amount of time (at least a few hours) needs to complete before it will be back online.

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## [Parallel Aware readers](https://discourse.paraview.org/t/parallel-aware-readers/6814)

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**Author:** [@mwestphal](https://discourse.paraview.org/u/mwestphal)\
**Replies:** 7\
**Last updated:** [August 10, 2021, 2:19pm UTC](https://discourse.paraview.org/t/parallel-aware-readers/6814 "2021-08-10T14:19:40Z")

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In ParaView, they are many readers, some are parallel aware, some aren’t. This term “parallel aware” is not strictly defined anywhere, there is a single reference to it in the doc https://docs.paraview.org/en/latest/Re…

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## [Checkbox decorator in Python Plugin](https://discourse.paraview.org/t/checkbox-decorator-in-python-plugin/7656)

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**Author:** [@Jared\_Blanchard](https://discourse.paraview.org/u/Jared_Blanchard)\
**Replies:** 2\
**Last updated:** [August 3, 2021, 3:03pm UTC](https://discourse.paraview.org/t/checkbox-decorator-in-python-plugin/7656 "2021-08-03T15:03:42Z")

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Is there a way to create a set of checkboxes in the GUI using vtkPythonAlgorithm decorators? Perhaps using xml?

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## [Logarithmic Slider with Decorator in Python Plugin](https://discourse.paraview.org/t/logarithmic-slider-with-decorator-in-python-plugin/7655)

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**Author:** [@Jared\_Blanchard](https://discourse.paraview.org/u/Jared_Blanchard)\
**Replies:** 3\
**Last updated:** [August 3, 2021, 2:23pm UTC](https://discourse.paraview.org/t/logarithmic-slider-with-decorator-in-python-plugin/7655 "2021-08-03T14:23:17Z")

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So far, I’ve only seen decorators that allow for linear scale slide bars. Is there a logarithmic scale slide bar? For example, I have a slide bar to scale a sphere. The growth rate is very high on the left side of the s…

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## [VtkHyperTreeGrid Super cursor issue in python](https://discourse.paraview.org/t/vtkhypertreegrid-super-cursor-issue-in-python/7626)

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**Author:** [@Loic22](https://discourse.paraview.org/u/Loic22)\
**Replies:** 1\
**Last updated:** [August 3, 2021, 9:56am UTC](https://discourse.paraview.org/t/vtkhypertreegrid-super-cursor-issue-in-python/7626 "2021-08-03T09:56:41Z")

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Hello, I notice a bug with the vtkHyperTreeGridNonOrientedMooreSuperCursor (and Von Neumann) using the Python interface. I am trying to get the cursor at neighbours of a specific cell but the call to the “GetNonOriented…

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## [Build failure on Ubuntu 20.04.2 ARM64](https://discourse.paraview.org/t/build-failure-on-ubuntu-20-04-2-arm64/7669)

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**Author:** [@mgrigorov](https://discourse.paraview.org/u/mgrigorov)\
**Replies:** 5\
**Last updated:** [July 23, 2021, 4:38pm UTC](https://discourse.paraview.org/t/build-failure-on-ubuntu-20-04-2-arm64/7669 "2021-07-23T16:38:17Z")

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Hello, Initially I reported this issue at 0003696: Build failure on Linux ARM64 for ThirdParty-dev - OpenFOAM Issue Tracking but I’ve been recommended to discuss it here. I am trying to build OpenFOAM on Ubuntu 20.04.2…

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## [Python Plugin Filter Reading Info from Python Plugin Source](https://discourse.paraview.org/t/python-plugin-filter-reading-info-from-python-plugin-source/7651)

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**Author:** [@Jared\_Blanchard](https://discourse.paraview.org/u/Jared_Blanchard)\
**Replies:** 7\
**Last updated:** [July 23, 2021, 2:57am UTC](https://discourse.paraview.org/t/python-plugin-filter-reading-info-from-python-plugin-source/7651 "2021-07-23T02:57:33Z")

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I’m using Paraview 5.8.0 on Ubuntu 20.04. I’ve created a python plugin that acts as a source with two vtkPolyData outputs (spheres). The source is called “CR3BP System” and inherits the VTKPythonAlgorithmBase class cla…

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## [xml format: constant data array possible?](https://discourse.paraview.org/t/xml-format-constant-data-array-possible/7510)

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**Author:** [@lens](https://discourse.paraview.org/u/lens)\
**Replies:** 3\
**Last updated:** [July 16, 2021, 3:53pm UTC](https://discourse.paraview.org/t/xml-format-constant-data-array-possible/7510 "2021-07-16T15:53:24Z")

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Hello there, using the ParaView xml format, is it possible to declare a data array as constant/uniform (i.e. all cells get the same value(s))? What I want is to only write something like \<DataArray type="Float64" form…

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## [Building ctest test, that is supposed to print ERR(ors) but terminate cleanly](https://discourse.paraview.org/t/building-ctest-test-that-is-supposed-to-print-err-ors-but-terminate-cleanly/7624)

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**Author:** [@florian.ziemen](https://discourse.paraview.org/u/florian.ziemen)\
**Replies:** 1\
**Last updated:** [July 15, 2021, 2:52pm UTC](https://discourse.paraview.org/t/building-ctest-test-that-is-supposed-to-print-err-ors-but-terminate-cleanly/7624 "2021-07-15T14:52:05Z")

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I’ve created a bunch of tests for the CDI (netcdf) reader, and I would like to also add tests with broken files / … where paraview is supposed to throw errors, but not crash. Now, when I build a test that causes an error…

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## [Paraview reading of Ensight Gold files.](https://discourse.paraview.org/t/paraview-reading-of-ensight-gold-files/2764)

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**Author:** [@DDdC](https://discourse.paraview.org/u/DDdC)\
**Replies:** 11\
**Last updated:** [July 13, 2021, 12:10pm UTC](https://discourse.paraview.org/t/paraview-reading-of-ensight-gold-files/2764 "2021-07-13T12:10:39Z")

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I am trying to use ParaView to read ensight gold files, but unfortunately, the software always crashes on my mac when attempting to open the file. I am not sure, but this seems a bug. Could anyone help me in this regard?…

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## [ParaView FindData Possible Improvements](https://discourse.paraview.org/t/paraview-finddata-possible-improvements/7521)

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**Author:** [@mwestphal](https://discourse.paraview.org/u/mwestphal)\
**Replies:** 8\
**Last updated:** [July 7, 2021, 2:48pm UTC](https://discourse.paraview.org/t/paraview-finddata-possible-improvements/7521 "2021-07-07T14:48:19Z")

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FindData as recently been docked but also lost the “query” mode that let user specify exactly how they want to select the data. Bringing back this mode would be already nice but maybe we should take thius further. eg: H…

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## [Paraview import of .h5part files](https://discourse.paraview.org/t/paraview-import-of-h5part-files/7566)

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**Author:** [@b.koch](https://discourse.paraview.org/u/b.koch)\
**Replies:** 0\
**Last updated:** [July 7, 2021, 1:42pm UTC](https://discourse.paraview.org/t/paraview-import-of-h5part-files/7566 "2021-07-07T13:42:22Z")

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Hey Paraview Community, i try to import a h5part file, which I create with H5Hut, into paraview. The file contains particle data such as the particle ID. Also, the physical time in each step is stored as a step attribu…

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## [Multiple colorbar custom positions not honored](https://discourse.paraview.org/t/multiple-colorbar-custom-positions-not-honored/5947)

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**Author:** [@kschau](https://discourse.paraview.org/u/kschau)\
**Replies:** 2\
**Last updated:** [July 6, 2021, 4:34pm UTC](https://discourse.paraview.org/t/multiple-colorbar-custom-positions-not-honored/5947 "2021-07-06T16:34:29Z")

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I have an issue on both a custom build and prebuilt binary with paraview 5.8.1 in which a python state is saved with a renderview that has two colorbars that have defined positions. At the end of the python script the t…

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## [How to combine mesh from Exodus2 file with data from CSV file](https://discourse.paraview.org/t/how-to-combine-mesh-from-exodus2-file-with-data-from-csv-file/7533)

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**Author:** [@jherb](https://discourse.paraview.org/u/jherb)\
**Replies:** 0\
**Last updated:** [July 1, 2021, 1:12pm UTC](https://discourse.paraview.org/t/how-to-combine-mesh-from-exodus2-file-with-data-from-csv-file/7533 "2021-07-01T13:12:39Z")

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I have the following use case: I would like to load the mesh from an Exodus2 file and combine it with data from a CSV file. The Exdous2 mesh contains cell regions recognized by the normal Exodus reader as blocks. Now th…

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## [Command line argument parsing](https://discourse.paraview.org/t/command-line-argument-parsing/4490)

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**Author:** [@utkarsh.ayachit](https://discourse.paraview.org/u/utkarsh.ayachit)\
**Replies:** 22\
**Last updated:** [July 1, 2021, 11:44am UTC](https://discourse.paraview.org/t/command-line-argument-parsing/4490 "2021-07-01T11:44:33Z")

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Is it time to rework the command line parsing to be bit cleaner? The current vtkPVOptions implementation is quite dated. cxxopts seems like a very elegant choice. It also has mechanism to group options into categories, …

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## [Change viewer setting in custom python reader](https://discourse.paraview.org/t/change-viewer-setting-in-custom-python-reader/7524)

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**Author:** [@rtlee](https://discourse.paraview.org/u/rtlee)\
**Replies:** 0\
**Last updated:** [June 30, 2021, 6:26pm UTC](https://discourse.paraview.org/t/change-viewer-setting-in-custom-python-reader/7524 "2021-06-30T18:26:30Z")

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Good afternoon, I wrote a Python plugin for Paraview using the routines in paraview.util.vtkAlgorithm. It works great, but I want to change some of the viewer settings when the file is opened (pick which scalar use for …

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## [3D Navigation gizmo](https://discourse.paraview.org/t/3d-navigation-gizmo/5743)

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**Author:** [@jaswantp](https://discourse.paraview.org/u/jaswantp)\
**Replies:** 3\
**Last updated:** [June 25, 2021, 10:48am UTC](https://discourse.paraview.org/t/3d-navigation-gizmo/5743 "2021-06-25T10:48:49Z")

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This is inspired from a comment on this proposal thread and coming from Blender. Is there ongoing development for a camera gizmo in Paraview/VTK much like the one in Blender? I think such a feature would boost the UX…

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## [Rendering occlusion bug?](https://discourse.paraview.org/t/rendering-occlusion-bug/7472)

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**Author:** [@datathing](https://discourse.paraview.org/u/datathing)\
**Replies:** 2\
**Last updated:** [June 24, 2021, 5:12pm UTC](https://discourse.paraview.org/t/rendering-occlusion-bug/7472 "2021-06-24T17:12:19Z")

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There seem to be cases where something that should be obscured will get rendered if the object that obscuring it is sufficiently thin. This problem is exacerbated if the 2D view is used. e.g. with zero vertical exaggera…

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## [Hiding VTK-m filters in ParaView](https://discourse.paraview.org/t/hiding-vtk-m-filters-in-paraview/7379)

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**Author:** [@vbolea](https://discourse.paraview.org/u/vbolea)\
**Replies:** 17\
**Last updated:** [June 23, 2021, 5:04pm UTC](https://discourse.paraview.org/t/hiding-vtk-m-filters-in-paraview/7379 "2021-06-23T17:04:02Z")

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Hi there! As a part of a long term task to further integrate VTK-m into ParaView, we are trying to expose VTK-m filters in the ParaView UI not as independent filters (such as vtkmContour) but instead under the same name…

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