# Development

**URL:** https://discourse.paraview.org/c/development/6.md?no_subcategories=false&page=10

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**Page:** 11

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## [MultiBlock Inspector only show one dataset there are two dataset with two process](https://discourse.paraview.org/t/multiblock-inspector-only-show-one-dataset-there-are-two-dataset-with-two-process/13619)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 7\
**Last updated:** [January 21, 2024, 9:07am UTC](https://discourse.paraview.org/t/multiblock-inspector-only-show-one-dataset-there-are-two-dataset-with-two-process/13619 "2024-01-21T09:07:27Z")

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After upgrade paraview from 5.9 to 5.12 i found when I load multiblock dataset with parallel process, there is something wrong when interacting with multiblock dataset. We created a multiblock data reader plugin, which …

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## [Is it normal to get alot of warnings when compling under windows?](https://discourse.paraview.org/t/is-it-normal-to-get-alot-of-warnings-when-compling-under-windows/13742)

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**Author:** [@uporersith](https://discourse.paraview.org/u/uporersith)\
**Replies:** 1\
**Last updated:** [January 19, 2024, 8:28pm UTC](https://discourse.paraview.org/t/is-it-normal-to-get-alot-of-warnings-when-compling-under-windows/13742 "2024-01-19T20:28:16Z")

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I’m following the directions from here: https://gitlab.kitware.com/paraview/paraview/-/blob/master/Documentation/dev/build.md#windows (I’m building v5.12.0-RC2) When i get to the ninja step, I get alot of these warning…

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## [Vtk renderer access from within the filter](https://discourse.paraview.org/t/vtk-renderer-access-from-within-the-filter/13740)

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**Author:** [@joint](https://discourse.paraview.org/u/joint)\
**Replies:** 0\
**Last updated:** [January 19, 2024, 3:35pm UTC](https://discourse.paraview.org/t/vtk-renderer-access-from-within-the-filter/13740 "2024-01-19T15:35:55Z")

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Hello! In vtk standard examples it is possible to select objects through a pattern like this vtkNew\<vtkRenderer\> renderer; vtkNew\<vtkRenderWindow\> renderWindow; renderWindow-\>AddRenderer(renderer); vtk…

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## [How to select points from the filter](https://discourse.paraview.org/t/how-to-select-points-from-the-filter/13739)

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**Author:** [@joint](https://discourse.paraview.org/u/joint)\
**Replies:** 0\
**Last updated:** [January 19, 2024, 11:35am UTC](https://discourse.paraview.org/t/how-to-select-points-from-the-filter/13739 "2024-01-19T11:35:22Z")

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Hello There is a way to select data from the filter on the server side PythonScript-\>Push("source = paraview.simple.GetActiveSource()"); PythonScript-\>Push("ClearSelection(source)"); StrPython = "SelectIDs(IDs=\[";…

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## [Explicitly set transform matrix values in Python](https://discourse.paraview.org/t/explicitly-set-transform-matrix-values-in-python/13737)

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**Author:** [@jgrime](https://discourse.paraview.org/u/jgrime)\
**Replies:** 2\
**Last updated:** [January 19, 2024, 8:08am UTC](https://discourse.paraview.org/t/explicitly-set-transform-matrix-values-in-python/13737 "2024-01-19T08:08:02Z")

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What I’d like to do is fairly simple: explicitly set the elements of the 4x4 matrix that is somehow lurking in the Transform class. The following code lets me do this (hat tip to Reshma, whose post I found while searchi…

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## [Plugin XML constraints](https://discourse.paraview.org/t/plugin-xml-constraints/13699)

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**Author:** [@joint](https://discourse.paraview.org/u/joint)\
**Replies:** 2\
**Last updated:** [January 15, 2024, 11:01am UTC](https://discourse.paraview.org/t/plugin-xml-constraints/13699 "2024-01-15T11:01:37Z")

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Hello! I have found the email about that properties names in XML should be unique https://public.kitware.com/pipermail/paraview/2012-June/025222.html However I am interested, whether or not they can repeat on differen…

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## [Irregular problem with widget invoking server procedures](https://discourse.paraview.org/t/irregular-problem-with-widget-invoking-server-procedures/13698)

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**Author:** [@joint](https://discourse.paraview.org/u/joint)\
**Replies:** 0\
**Last updated:** [January 15, 2024, 9:36am UTC](https://discourse.paraview.org/t/irregular-problem-with-widget-invoking-server-procedures/13698 "2024-01-15T09:36:26Z")

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Hello I have a need for a widget, which receives non-default values, derived from the data file. I have followed your e-mail instruction on invoking remote procedures on the server side, and in constructor of the widg…

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## [Proposition of Python View parameters](https://discourse.paraview.org/t/proposition-of-python-view-parameters/13669)

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**Author:** [@nicolas.vuaille](https://discourse.paraview.org/u/nicolas.vuaille)\
**Replies:** 6\
**Last updated:** [January 11, 2024, 3:08pm UTC](https://discourse.paraview.org/t/proposition-of-python-view-parameters/13669 "2024-01-11T15:08:19Z")

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Hi community, The Python View is a 2D Render View that is configured from a python script, given as property. One use case is to use external tools like Matplotlib to do the rendering, like here: Limitations User s…

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## [The pqEventDispatcher.h file cannot be found in the source code project](https://discourse.paraview.org/t/the-pqeventdispatcher-h-file-cannot-be-found-in-the-source-code-project/13673)

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**Author:** [@yuntianming](https://discourse.paraview.org/u/yuntianming)\
**Replies:** 2\
**Last updated:** [January 11, 2024, 11:57am UTC](https://discourse.paraview.org/t/the-pqeventdispatcher-h-file-cannot-be-found-in-the-source-code-project/13673 "2024-01-11T11:57:02Z")

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I’m studying the source code of paraview recently, and I cloned the latest code from GitHub. In the process of reading the source code, I found that I could not find the pqEventDispatcher.h file, and of course I could no…

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## [Does or can Paraview support streaming input?](https://discourse.paraview.org/t/does-or-can-paraview-support-streaming-input/13637)

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**Author:** [@mmarchywka](https://discourse.paraview.org/u/mmarchywka)\
**Replies:** 8\
**Last updated:** [January 8, 2024, 6:42pm UTC](https://discourse.paraview.org/t/does-or-can-paraview-support-streaming-input/13637 "2024-01-08T18:42:15Z")

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Paraview appears to be a popular flexible visual tool but mostly designed for polishing and publishing. However, I was still curious if it supported a monitroing mode and could accept streaming input? That is, I need s…

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## [PYTHON\_EXECUTABLE CMake variable](https://discourse.paraview.org/t/python-executable-cmake-variable/13634)

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**Author:** [@guillaume\_Peillex](https://discourse.paraview.org/u/guillaume_Peillex)\
**Replies:** 2\
**Last updated:** [January 5, 2024, 10:04pm UTC](https://discourse.paraview.org/t/python-executable-cmake-variable/13634 "2024-01-05T22:04:50Z")

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Hi all, I am currently working around ParaView and Spack and i realized that in the Spack’s ParaView recipe (https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/paraview/package.py) the CMake va…

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## [Automatic offscreen generation of (render, chart, ..) views screenshots](https://discourse.paraview.org/t/automatic-offscreen-generation-of-render-chart-views-screenshots/13604)

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**Author:** [@nenad-vujicic](https://discourse.paraview.org/u/nenad-vujicic)\
**Replies:** 4\
**Last updated:** [January 2, 2024, 10:51am UTC](https://discourse.paraview.org/t/automatic-offscreen-generation-of-render-chart-views-screenshots/13604 "2024-01-02T10:51:55Z")

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Hello, everyone! I’m trying to automatically generate reports from my ParaView exporter plugin, by creating the scene first manually (from Qt client), and then, from the exporter plugin apply some additional filters, ap…

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## [Issue with representation type selection with Qt6 on Arch Linux](https://discourse.paraview.org/t/issue-with-representation-type-selection-with-qt6-on-arch-linux/12765)

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**Author:** [@YvanFournier](https://discourse.paraview.org/u/YvanFournier)\
**Replies:** 5\
**Last updated:** [January 2, 2024, 8:58am UTC](https://discourse.paraview.org/t/issue-with-representation-type-selection-with-qt6-on-arch-linux/12765 "2024-01-02T08:58:02Z")

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Hello, On Arch Linux, building ParaView with Qt6, I have an issue with a the representation mode selection: When right-clicking on a mesh ans selecting the representation type with th checkbox selection, everything is…

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## [How to implement the plugin that support different types of data source](https://discourse.paraview.org/t/how-to-implement-the-plugin-that-support-different-types-of-data-source/13609)

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**Author:** [@zhe](https://discourse.paraview.org/u/zhe)\
**Replies:** 2\
**Last updated:** [December 29, 2023, 3:36pm UTC](https://discourse.paraview.org/t/how-to-implement-the-plugin-that-support-different-types-of-data-source/13609 "2023-12-29T15:36:52Z")

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Hi, dear ParaView experts: There is a ParaView plugin that works for imageData. I recently updated it and it also work for unstructuredGrid data, could you provide some guidance about how to update the header file and m…

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## [Paraview failed to show window on a multi-monitor setup](https://discourse.paraview.org/t/paraview-failed-to-show-window-on-a-multi-monitor-setup/13601)

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**Author:** [@Javen](https://discourse.paraview.org/u/Javen)\
**Replies:** 1\
**Last updated:** [December 28, 2023, 7:21am UTC](https://discourse.paraview.org/t/paraview-failed-to-show-window-on-a-multi-monitor-setup/13601 "2023-12-28T07:21:03Z")

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Paraview failed to show window on a multi-monitor setup, There will only be a blank window and can only be viewed in the taskbar thumbnail. Is there anything I can do to prevent this? I have attached a log generated by …

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## [Plugin with ui\_resources in environment without Qt](https://discourse.paraview.org/t/plugin-with-ui-resources-in-environment-without-qt/12953)

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**Author:** [@guillaume\_Peillex](https://discourse.paraview.org/u/guillaume_Peillex)\
**Replies:** 13\
**Last updated:** [December 22, 2023, 1:15pm UTC](https://discourse.paraview.org/t/plugin-with-ui-resources-in-environment-without-qt/12953 "2023-12-22T13:15:43Z")

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Hi all, I’m currently trying to build a plugin that has its own ui\_resources. So i’am declaring it with the UI\_RESOURCES keyword of the paraview\_add\_plugin function. I need to compile this plugin in an environment wher…

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## [Access server or proxies via multiple Qt threads](https://discourse.paraview.org/t/access-server-or-proxies-via-multiple-qt-threads/13585)

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**Author:** [@Pietersielie](https://discourse.paraview.org/u/Pietersielie)\
**Replies:** 0\
**Last updated:** [December 21, 2023, 2:13pm UTC](https://discourse.paraview.org/t/access-server-or-proxies-via-multiple-qt-threads/13585 "2023-12-21T14:13:50Z")

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Good day. I have a custom C++/Qt client application that uses Paraview to connect to a PVServer instance. I have multiple Qt windows to display data. I have an expensive filter that I want to apply to one set of data. H…

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## [plugin development commit](https://discourse.paraview.org/t/plugin-development-commit/12742)

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**Author:** [@zetwal](https://discourse.paraview.org/u/zetwal)\
**Replies:** 22\
**Last updated:** [December 15, 2023, 5:47pm UTC](https://discourse.paraview.org/t/plugin-development-commit/12742 "2023-12-15T17:47:19Z")

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Hello I’m upgrading the GenericIO plugin; it’s basically version 1.1 of the plugin I added in 2016/2017. Once everything is sorted out, I’d like 1.1 to be integrated into ParaView. I used the github repo of paraview (m…

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## [Catalyst: Finer grain control over execution](https://discourse.paraview.org/t/catalyst-finer-grain-control-over-execution/13475)

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**Author:** [@Christos\_Tsolakis](https://discourse.paraview.org/u/Christos_Tsolakis)\
**Replies:** 10\
**Last updated:** [December 14, 2023, 9:30pm UTC](https://discourse.paraview.org/t/catalyst-finer-grain-control-over-execution/13475 "2023-12-14T21:30:46Z")

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As it stands right now if a simulation calls catalyst\_execute data will be converted even if the extractors run at a frequency greater than one. Even though conduit blueprints are lightweight this could be costly depend…

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## [ParaView versioning change](https://discourse.paraview.org/t/paraview-versioning-change/13291)

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**Author:** [@ben.boeckel](https://discourse.paraview.org/u/ben.boeckel)\
**Replies:** 10\
**Last updated:** [December 7, 2023, 12:32pm UTC](https://discourse.paraview.org/t/paraview-versioning-change/13291 "2023-12-07T12:32:59Z")

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Hi all, ParaView is consistently reaching the maximum file path limits on its Windows packaging builds. In order to help reduce this, there’s an idea to migrate to date-based versioning on master rather than git describ…

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## [Silo files being brought in separately instead of grouped](https://discourse.paraview.org/t/silo-files-being-brought-in-separately-instead-of-grouped/13455)

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**Author:** [@David\_Ortley](https://discourse.paraview.org/u/David_Ortley)\
**Replies:** 0\
**Last updated:** [December 6, 2023, 9:20pm UTC](https://discourse.paraview.org/t/silo-files-being-brought-in-separately-instead-of-grouped/13455 "2023-12-06T21:20:51Z")

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One of the formats our code produces as output are silo files. When we output them in parallel, there is a ???.master.silo header file produced that we load. The ???'s are cycle numbers of the dump times. When using Par…

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## [Add option to compute surface normals in Surface representations?](https://discourse.paraview.org/t/add-option-to-compute-surface-normals-in-surface-representations/13309)

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**Author:** [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)\
**Replies:** 15\
**Last updated:** [December 5, 2023, 2:25pm UTC](https://discourse.paraview.org/t/add-option-to-compute-surface-normals-in-surface-representations/13309 "2023-12-05T14:25:26Z")

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If you have surface data without normals, you can use the Generate Surface Normals filter to generate normals and get smoother shading. If you have volumetric data and you are displaying the outer boundary of the volume…

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## [Filter XML for Input Array Values from Optional Input](https://discourse.paraview.org/t/filter-xml-for-input-array-values-from-optional-input/13366)

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**Author:** [@moritz-h](https://discourse.paraview.org/u/moritz-h)\
**Replies:** 3\
**Last updated:** [November 29, 2023, 4:10pm UTC](https://discourse.paraview.org/t/filter-xml-for-input-array-values-from-optional-input/13366 "2023-11-29T16:10:03Z")

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I have a custom plugin with a filter which has two inputs, the second input is optional. I want to add a widget to select input arrays on the second optional input if it is present and need to write the XML for this. Ad…

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## [codesigning Paraview for MacOS](https://discourse.paraview.org/t/codesigning-paraview-for-macos/13222)

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**Author:** [@sgpearse](https://discourse.paraview.org/u/sgpearse)\
**Replies:** 4\
**Last updated:** [November 27, 2023, 3:44pm UTC](https://discourse.paraview.org/t/codesigning-paraview-for-macos/13222 "2023-11-27T15:44:25Z")

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I am a developer for VAPOR, a 3D visualization application similar to ParaView, developed at the National Center for Atmospheric Research. Like ParaView, we use CMake with the Unix Makefiles generator to produce our ins…

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## [Mesa warning: Window has no colormap!](https://discourse.paraview.org/t/mesa-warning-window-has-no-colormap/10963)

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**Author:** [@Kamal\_pandey](https://discourse.paraview.org/u/Kamal_pandey)\
**Replies:** 9\
**Last updated:** [November 27, 2023, 1:50pm UTC](https://discourse.paraview.org/t/mesa-warning-window-has-no-colormap/10963 "2023-11-27T13:50:08Z")

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Hello experts. While running paraview in ubuntu 22.04, i get this error Mesa warning: Window 54525961 has no colormap! Mesa warning: Window 54525964 has no colormap! Mesa warning: Window 54525974 has no colormap! Kin…

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## [Standalone SDK for plugins development ?](https://discourse.paraview.org/t/standalone-sdk-for-plugins-development/13298)

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**Author:** [@Nicholas\_Yue](https://discourse.paraview.org/u/Nicholas_Yue)\
**Replies:** 2\
**Last updated:** [November 22, 2023, 2:11pm UTC](https://discourse.paraview.org/t/standalone-sdk-for-plugins-development/13298 "2023-11-22T14:11:51Z")

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Hi, I have been tracking the development of ParaView over the years. My understanding is that (C++) plugins and extension development generally require building it together with the source code of ParaView Are there p…

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## [PVTU (multiple VTUs) to one VTU](https://discourse.paraview.org/t/pvtu-multiple-vtus-to-one-vtu/13213)

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**Author:** [@ermore](https://discourse.paraview.org/u/ermore)\
**Replies:** 1\
**Last updated:** [November 9, 2023, 9:58am UTC](https://discourse.paraview.org/t/pvtu-multiple-vtus-to-one-vtu/13213 "2023-11-09T09:58:25Z")

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I use the MPI program to run out the calculation results to generate pvtu (it is made up of many vtu), and I want to turn multiple vtu files into one vtu. If I want to use C++, which vtk API can I call to implement this …

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## [add scipy library to paraview's python in windows](https://discourse.paraview.org/t/add-scipy-library-to-paraviews-python-in-windows/13023)

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**Author:** [@otaolafr](https://discourse.paraview.org/u/otaolafr)\
**Replies:** 3\
**Last updated:** [October 11, 2023, 10:17pm UTC](https://discourse.paraview.org/t/add-scipy-library-to-paraviews-python-in-windows/13023 "2023-10-11T22:17:37Z")

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Hello, scipy is an excelent tool for data analysis, and the issue is that it is not available in windows but it is by default in linux. it would be nice to be added by default in the pre compiled downloadable versions f…

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## [Generating CSV or a Matrix in custom application code](https://discourse.paraview.org/t/generating-csv-or-a-matrix-in-custom-application-code/11874)

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**Author:** [@Muhammad\_Saad\_Atique](https://discourse.paraview.org/u/Muhammad_Saad_Atique)\
**Replies:** 5\
**Last updated:** [October 5, 2023, 9:29pm UTC](https://discourse.paraview.org/t/generating-csv-or-a-matrix-in-custom-application-code/11874 "2023-10-05T21:29:44Z")

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Hi, In my custom application I want to convert my object into a csv or a matrix form. I mean in the code I want to generate the CSV and pass it to my own backend simulation code. How can I achieve that? It can have mult…

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## [MPI portability with Wi4MPI](https://discourse.paraview.org/t/mpi-portability-with-wi4mpi/12918)

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**Author:** [@utkarsh.ayachit](https://discourse.paraview.org/u/utkarsh.ayachit)\
**Replies:** 4\
**Last updated:** [September 28, 2023, 6:16pm UTC](https://discourse.paraview.org/t/mpi-portability-with-wi4mpi/12918 "2023-09-28T18:16:01Z")

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Recently ran into this: GitHub - cea-hpc/wi4mpi: Wrapper interface for MPI Wondering if anyone has looked into using wi4mpi for ParaView? Sounds like a promising approach to distribute portable binaries.

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