# Development

**URL:** https://discourse.paraview.org/c/development/6.md

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

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## [About the Development category](https://discourse.paraview.org/t/about-the-development-category/24)

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**Author:** [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)\
**Replies:** 0\
**Last updated:** [May 18, 2018, 5:46pm UTC](https://discourse.paraview.org/t/about-the-development-category/24 "2018-05-18T17:46:15Z")

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The Development category is for the discussion of ParaView development, including potential bugs, plugin development, ParaView-derived applications, software testing, and related topics.

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## [Core dumps "often"](https://discourse.paraview.org/t/core-dumps-often/17735)

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**Author:** [@Bismuth-tetser.93](https://discourse.paraview.org/u/Bismuth-tetser.93)\
**Replies:** 6\
**Last updated:** [September 23, 2026, 8:56pm UTC](https://discourse.paraview.org/t/core-dumps-often/17735 "2026-09-23T20:56:15Z")

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Not sure how to report this bug(s)… but I get core dumps now and then. I just got one by dragging my mouse in the rendered view of my data. I had started Paraview with the terminal. This is what I see: \[openvkl\] applica…

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## [Proposal : Redesign the UI of ParaView](https://discourse.paraview.org/t/proposal-redesign-the-ui-of-paraview/17676)

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**Author:** [@lucas.gottar](https://discourse.paraview.org/u/lucas.gottar)\
**Replies:** 6\
**Last updated:** [September 17, 2026, 7:46am UTC](https://discourse.paraview.org/t/proposal-redesign-the-ui-of-paraview/17676 "2026-09-17T07:46:06Z")

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I feel like the UI of ParaView seems a bit old. Indeed it uses all Qt elements by default without any customization. Elements are also all packed together and the widgets have no space to “breath”. Modernizing the design…

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## [Refreshing Properties Panel without applying pipeline object](https://discourse.paraview.org/t/refreshing-properties-panel-without-applying-pipeline-object/17731)

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**Author:** [@Kenneth\_Moreland](https://discourse.paraview.org/u/Kenneth_Moreland)\
**Replies:** 2\
**Last updated:** [September 16, 2026, 12:23pm UTC](https://discourse.paraview.org/t/refreshing-properties-panel-without-applying-pipeline-object/17731 "2026-09-16T12:23:43Z")

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I have a reader that reads data from two files: one holding a grid and one holding fields. The sequence for loading this data is to open the file with the grid and then select the file holding the fields using a selector…

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## [\`triage\` tags](https://discourse.paraview.org/t/triage-tags/17718)

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**Author:** [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)\
**Replies:** 3\
**Last updated:** [September 8, 2026, 2:51pm UTC](https://discourse.paraview.org/t/triage-tags/17718 "2026-09-08T14:51:30Z")

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Is there an assumption that every issue gets a triage tag? Conversation started here: https://gitlab.kitware.com/paraview/paraview/-/work\_items/23318#note\_1864806

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## [Proposal : Add settings presets](https://discourse.paraview.org/t/proposal-add-settings-presets/17702)

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**Author:** [@corentin.munoz](https://discourse.paraview.org/u/corentin.munoz)\
**Replies:** 5\
**Last updated:** [September 4, 2026, 9:51am UTC](https://discourse.paraview.org/t/proposal-add-settings-presets/17702 "2026-09-04T09:51:34Z")

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Hi everyone, ParaView has a lot of settings and properties to configure how you want your data to be rendered, and it can be quite hard to find the perfect settings. Some of you might have written down a collection of s…

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## [User feedback: how do you interact with the ParaView client UI?](https://discourse.paraview.org/t/user-feedback-how-do-you-interact-with-the-paraview-client-ui/17684)

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**Author:** [@Yann](https://discourse.paraview.org/u/Yann)\
**Replies:** 20\
**Last updated:** [August 25, 2026, 10:17am UTC](https://discourse.paraview.org/t/user-feedback-how-do-you-interact-with-the-paraview-client-ui/17684 "2026-08-25T10:17:02Z")

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The recent UI improvements proposals made me reflect on how I interact with the ParaView client, what I really use and what I never use. I’m currently experimenting a setup where I removed all the toolbars which are use…

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## [Proposal : Improve toolbar](https://discourse.paraview.org/t/proposal-improve-toolbar/17677)

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**Author:** [@lucas.gottar](https://discourse.paraview.org/u/lucas.gottar)\
**Replies:** 6\
**Last updated:** [August 24, 2026, 2:15pm UTC](https://discourse.paraview.org/t/proposal-improve-toolbar/17677 "2026-08-24T14:15:27Z")

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The toolbar of ParaView is overloaded to me, there are too many buttons that are always present and for some views of ParaView, almost all button turns gray. I think there are a lot of improvement to bring to this toolba…

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## [Proposal : Improve Properties Panels](https://discourse.paraview.org/t/proposal-improve-properties-panels/17675)

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**Author:** [@lucas.gottar](https://discourse.paraview.org/u/lucas.gottar)\
**Replies:** 13\
**Last updated:** [August 24, 2026, 2:10pm UTC](https://discourse.paraview.org/t/proposal-improve-properties-panels/17675 "2026-08-24T14:10:41Z")

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For me, there are too much information in the properties panel and some filters might be hard to understand. I think there are a lot to improve in the properties panel but for now I will focus on the properties group. W…

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## [Proposal: Enhance/Generalize Filter Search](https://discourse.paraview.org/t/proposal-enhance-generalize-filter-search/17681)

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**Author:** [@theodorebaltis](https://discourse.paraview.org/u/theodorebaltis)\
**Replies:** 12\
**Last updated:** [August 24, 2026, 8:12am UTC](https://discourse.paraview.org/t/proposal-enhance-generalize-filter-search/17681 "2026-08-24T08:12:58Z")

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One of my favorite UI/UX aspects of ParaView is the filter search menu (Ctrl+Space on Windows). and with the recent discussions about various improvements I started thinking about if this quick search could be even bette…

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## [ParaView Client/Server communication and abort support](https://discourse.paraview.org/t/paraview-client-server-communication-and-abort-support/17430)

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**Author:** [@mwestphal](https://discourse.paraview.org/u/mwestphal)\
**Replies:** 2\
**Last updated:** [August 21, 2026, 8:45am UTC](https://discourse.paraview.org/t/paraview-client-server-communication-and-abort-support/17430 "2026-08-21T08:45:21Z")

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I’m currently working on supporting abort in ParaView and in that context I had to understand the client/server communication protocol, which is virtually undocumented even in developer docs. So I decided to share my fi…

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## [DigitalSignalProcessing plugin limited to vtkMultiBlockDataSet inputs](https://discourse.paraview.org/t/digitalsignalprocessing-plugin-limited-to-vtkmultiblockdataset-inputs/17682)

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**Author:** [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)\
**Replies:** 2\
**Last updated:** [August 14, 2026, 1:42pm UTC](https://discourse.paraview.org/t/digitalsignalprocessing-plugin-limited-to-vtkmultiblockdataset-inputs/17682 "2026-08-14T13:42:33Z")

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I am working on steps 1 and 2 outlined in the post Deprecating MultiBlock datasets - #50 by spyridon97 There were only two filters in ParaView proper that did not accept vtkPartitionedDataSetCollections as input: BlockI…

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## [Proposal : Improve the Welcome Page](https://discourse.paraview.org/t/proposal-improve-the-welcome-page/17674)

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**Author:** [@lucas.gottar](https://discourse.paraview.org/u/lucas.gottar)\
**Replies:** 9\
**Last updated:** [August 12, 2026, 3:45pm UTC](https://discourse.paraview.org/t/proposal-improve-the-welcome-page/17674 "2026-08-12T15:45:13Z")

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The Welcome Page of ParaView doesn’t offer any functionality other than seeing visualization examples and getting started guide. So, this page doens’t seem very relevant to ParaView users. We could use this welcome p…

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## [Python Reader Plugin: change output names at runtime](https://discourse.paraview.org/t/python-reader-plugin-change-output-names-at-runtime/9072)

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**Author:** [@estefan](https://discourse.paraview.org/u/estefan)\
**Replies:** 5\
**Last updated:** [August 5, 2026, 2:43pm UTC](https://discourse.paraview.org/t/python-reader-plugin-change-output-names-at-runtime/9072 "2026-08-05T14:43:38Z")

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Hello everyone. First of all thanks for paraview and the great python plugin support! Is there some API to change the name of the output after the filename was set? Context: I started off the VTKAlgorithmBase based cs…

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## [How to access to a plugin properties panel?](https://discourse.paraview.org/t/how-to-access-to-a-plugin-properties-panel/2720)

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**Author:** [@Loic](https://discourse.paraview.org/u/Loic)\
**Replies:** 5\
**Last updated:** [July 10, 2026, 8:56am UTC](https://discourse.paraview.org/t/how-to-access-to-a-plugin-properties-panel/2720 "2026-07-10T08:56:24Z")

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Hi, I would like to develop a plugin based on VTKPythonAlgorithmBase. This plugin take as input a vtkDataset and 3 coordinates representing the position of a camera. With the following code, I’ve managed to expose the…

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## [How to keep insertion order in the Spreadsheet table columns?](https://discourse.paraview.org/t/how-to-keep-insertion-order-in-the-spreadsheet-table-columns/17638)

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**Author:** [@CsatiZoltan](https://discourse.paraview.org/u/CsatiZoltan)\
**Replies:** 2\
**Last updated:** [June 29, 2026, 1:20pm UTC](https://discourse.paraview.org/t/how-to-keep-insertion-order-in-the-spreadsheet-table-columns/17638 "2026-06-29T13:20:03Z")

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In the RequestData method of my Python plugin, I fill a VTKTable by columns: one column for each dataset: from vtkmodules.numpy\_interface import dataset\_adapter def RequestData(self, request, inInfoVector, outInfoVecto…

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## [Adding support for opening \*any\* archived single file](https://discourse.paraview.org/t/adding-support-for-opening-any-archived-single-file/13365)

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**Author:** [@mwestphal](https://discourse.paraview.org/u/mwestphal)\
**Replies:** 11\
**Last updated:** [June 22, 2026, 1:42pm UTC](https://discourse.paraview.org/t/adding-support-for-opening-any-archived-single-file/13365 "2026-06-22T13:42:53Z")

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I’m wondering if there is any interest to add support in ParaView for opening any archived file with ParaView. What I mean by that would be as follow. Lets take a file that ParaView is able to open, file.ext Lets arch…

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## [Best practice to read files in parallel](https://discourse.paraview.org/t/best-practice-to-read-files-in-parallel/1929)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 8\
**Last updated:** [June 22, 2026, 1:22pm UTC](https://discourse.paraview.org/t/best-practice-to-read-files-in-parallel/1929 "2026-06-22T13:22:09Z")

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Dear Experts, I created my own reader plugins which can read raw data from files and convert data into vtk data successfully. However, in my situation, there will be a large number of files, so i want to use MPI to rea…

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## [Improved Python Calculator expression editor](https://discourse.paraview.org/t/improved-python-calculator-expression-editor/17621)

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**Author:** [@spyridon97](https://discourse.paraview.org/u/spyridon97)\
**Replies:** 16\
**Last updated:** [June 16, 2026, 8:35pm UTC](https://discourse.paraview.org/t/improved-python-calculator-expression-editor/17621 "2026-06-16T20:35:01Z")

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I’ve been working on improving the Python Calculator panel in ParaView and would love some early feedback before this lands. What’s new: The panel now has three helper dropdowns alongside the expression editor: Input…

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## [Cannot import Python modules after having compiled a Python plugin](https://discourse.paraview.org/t/cannot-import-python-modules-after-having-compiled-a-python-plugin/17622)

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**Author:** [@CsatiZoltan](https://discourse.paraview.org/u/CsatiZoltan)\
**Replies:** 3\
**Last updated:** [June 16, 2026, 2:23pm UTC](https://discourse.paraview.org/t/cannot-import-python-modules-after-having-compiled-a-python-plugin/17622 "2026-06-16T14:23:48Z")

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I wrote a Python plugin, which imports other custom Python modules (helper modules that I wrote myself). After setting PYTHONPATH and then launching ParaView, I can load the plugin successfully and it works as intended. …

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## [PointSet raytracing colors defects](https://discourse.paraview.org/t/pointset-raytracing-colors-defects/17619)

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**Author:** [@jfavre](https://discourse.paraview.org/u/jfavre)\
**Replies:** 2\
**Last updated:** [June 16, 2026, 8:46am UTC](https://discourse.paraview.org/t/pointset-raytracing-colors-defects/17619 "2026-06-16T08:46:59Z")

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I have raytraced many particle datasets in the past with great results. Up until ParaView v6.0, I used to compile ParaView with OSPRay v3.1. I don’t use materials, only scalar field coloring. Trying ParaView v6.1, I mad…

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## [Install any python package question](https://discourse.paraview.org/t/install-any-python-package-question/17608)

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**Author:** [@CsatiZoltan](https://discourse.paraview.org/u/CsatiZoltan)\
**Replies:** 3\
**Last updated:** [May 27, 2026, 9:05pm UTC](https://discourse.paraview.org/t/install-any-python-package-question/17608 "2026-05-27T21:05:17Z")

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@mwestphal I created the virtual environment successfully with pvpython: ./pvpython -m venv .venv But when I open the site packages directory (.venv/lib/python3.10/site-packages/), I do not see the actual Python packa…

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## [Issues with OpenFOAM Foundation v13 results](https://discourse.paraview.org/t/issues-with-openfoam-foundation-v13-results/17586)

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**Author:** [@whereismymoney](https://discourse.paraview.org/u/whereismymoney)\
**Replies:** 0\
**Last updated:** [May 28, 2026, 2:10am UTC](https://discourse.paraview.org/t/issues-with-openfoam-foundation-v13-results/17586 "2026-05-28T02:10:33Z")

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I got the latest version of ParaView (which is 6.1.1), and it has difficulties with the OpenFOAM Foundation v13 results for the Duisburg Test Case Tutorial. For example, if I check the checkbox for “symmetryPlane”, the r…

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## [Unable to open files in macOS](https://discourse.paraview.org/t/unable-to-open-files-in-macos/6471)

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**Author:** [@jclai](https://discourse.paraview.org/u/jclai)\
**Replies:** 13\
**Last updated:** [May 26, 2026, 12:54pm UTC](https://discourse.paraview.org/t/unable-to-open-files-in-macos/6471 "2026-05-26T12:54:13Z")

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Hello, I am trying to use ParaView 5.8.1 on macOS Big Sur 11.2.1, but I am unable to open any data files. When I click File \> Open or the corresponding icon in the ParaView GUI, nothing opens and my cursor indicates som…

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## [Inaccurate tick marks in legend](https://discourse.paraview.org/t/inaccurate-tick-marks-in-legend/17573)

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**Author:** [@fvg](https://discourse.paraview.org/u/fvg)\
**Replies:** 1\
**Last updated:** [May 20, 2026, 10:32am UTC](https://discourse.paraview.org/t/inaccurate-tick-marks-in-legend/17573 "2026-05-20T10:32:29Z")

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I set the jumps between colors to exact values, e.g. 7,5. However, the color bar puts the tick mark slightly off (esp. at 7,5). See image. Enabling discretize to e.g. 1000 fixes this partly. This seems like a bug, corr…

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## [Cannot create MR for CFSRead - identified as spam](https://discourse.paraview.org/t/cannot-create-mr-for-cfsread-identified-as-spam/17567)

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**Author:** [@Fabian](https://discourse.paraview.org/u/Fabian)\
**Replies:** 3\
**Last updated:** [May 14, 2026, 7:30pm UTC](https://discourse.paraview.org/t/cannot-create-mr-for-cfsread-identified-as-spam/17567 "2026-05-14T19:30:25Z")

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Some years ago I submitted the CFSReader plugin, which got merged on ParaView. Thanks again for the help I got that time! The current CFSReader has a reload issue on Windows I try to fix with a patch. https://gitlab.ki…

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## [Handling overlapping node labels and dense graph visualization in ParaView/pvpython](https://discourse.paraview.org/t/handling-overlapping-node-labels-and-dense-graph-visualization-in-paraview-pvpython/17562)

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**Author:** [@Sahith](https://discourse.paraview.org/u/Sahith)\
**Replies:** 2\
**Last updated:** [May 12, 2026, 11:07am UTC](https://discourse.paraview.org/t/handling-overlapping-node-labels-and-dense-graph-visualization-in-paraview-pvpython/17562 "2026-05-12T11:07:50Z")

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Hello, I am exploring graph/extremum graph visualization workflows in ParaView (5.13.3) and testing node labeling for dense topology visualizations. So far I tested: Find Data Extract Selection Point Labels / …

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## [Deprecating MultiBlock datasets](https://discourse.paraview.org/t/deprecating-multiblock-datasets/4950)

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**Author:** [@utkarsh.ayachit](https://discourse.paraview.org/u/utkarsh.ayachit)\
**Replies:** 52\
**Last updated:** [May 11, 2026, 1:35pm UTC](https://discourse.paraview.org/t/deprecating-multiblock-datasets/4950 "2026-05-11T13:35:49Z")

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Multiblock Datasets (vtkMultiBlockDataSet) have been used in ParaView for representing a collection of datasets. Besides being a container for multiple datasets, called blocks, it also lets us define relationships betwee…

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## [CMake description of ParaView 6.x dose not match the actual requirements about Python.](https://discourse.paraview.org/t/cmake-description-of-paraview-6-x-dose-not-match-the-actual-requirements-about-python/17552)

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**Author:** [@earth2001y](https://discourse.paraview.org/u/earth2001y)\
**Replies:** 6\
**Last updated:** [May 8, 2026, 12:55am UTC](https://discourse.paraview.org/t/cmake-description-of-paraview-6-x-dose-not-match-the-actual-requirements-about-python/17552 "2026-05-08T00:55:17Z")

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pvpython of ParaView 6.1 build from source code on Rocky Linux 8 doesn’t work import paraview.simple with following message. \>\>\> import paraview.simple Traceback (most recent call last): File "\<stdin\>", line 1, in \<mo…

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## [Why do certain packages need to be installed when using the ParaView binary package ?](https://discourse.paraview.org/t/why-do-certain-packages-need-to-be-installed-when-using-the-paraview-binary-package/16719)

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**Author:** [@mwestphal](https://discourse.paraview.org/u/mwestphal)\
**Replies:** 4\
**Last updated:** [May 5, 2026, 9:02am UTC](https://discourse.paraview.org/t/why-do-certain-packages-need-to-be-installed-when-using-the-paraview-binary-package/16719 "2026-05-05T09:02:04Z")

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I sometimes get that questions from other developpers and users as well. So I tried to give a comprehensive answers. Please let me know if you spot anything wrong. I focused a bit more on xcb for reasons. As stated in …

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