# Development

**URL:** https://discourse.paraview.org/c/development/6.md?no_subcategories=false&page=11

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

**Page:** 12

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## [Error reading vtk file](https://discourse.paraview.org/t/error-reading-vtk-file/12931)

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**Author:** [@Archana](https://discourse.paraview.org/u/Archana)\
**Replies:** 6\
**Last updated:** [September 28, 2023, 8:25am UTC](https://discourse.paraview.org/t/error-reading-vtk-file/12931 "2023-09-28T08:25:49Z")

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I get the following error reading a vtk file created by a fortran program. Generic Warning: In vtkDataReader.cxx, line 1537 Error reading ascii data. Possible mismatch of datasize with declaration. ERROR: In vtkDataRe…

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## [ParaView Python Documentation Future Updates](https://discourse.paraview.org/t/paraview-python-documentation-future-updates/9490)

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**Author:** [@spyridon97](https://discourse.paraview.org/u/spyridon97)\
**Replies:** 10\
**Last updated:** [September 27, 2023, 11:58am UTC](https://discourse.paraview.org/t/paraview-python-documentation-future-updates/9490 "2023-09-27T11:58:16Z")

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ParaView Guide is the central location for documentation regarding Paraview. Recently, ParaView Self-directed Tutorial (also known as The ParaView Tutorial) and Classroom Tutorials (from Sandia) have been moved at Para…

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## [Separate colour maps for multiple representations in single render view in custom application](https://discourse.paraview.org/t/separate-colour-maps-for-multiple-representations-in-single-render-view-in-custom-application/12882)

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**Author:** [@Pietersielie](https://discourse.paraview.org/u/Pietersielie)\
**Replies:** 5\
**Last updated:** [September 27, 2023, 10:03am UTC](https://discourse.paraview.org/t/separate-colour-maps-for-multiple-representations-in-single-render-view-in-custom-application/12882 "2023-09-27T10:03:56Z")

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I have a custom Paraview application that is used to display astronomical data. As part of it, I display multiple 2D images in the same renderview (an instance of pqRenderView\*). The images are all instantiated and loade…

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## [FDSReader Direction](https://discourse.paraview.org/t/fdsreader-direction/12923)

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**Author:** [@johodges](https://discourse.paraview.org/u/johodges)\
**Replies:** 1\
**Last updated:** [September 25, 2023, 4:13pm UTC](https://discourse.paraview.org/t/fdsreader-direction/12923 "2023-09-25T16:13:52Z")

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Hello all, We are using Paraview to visualize FDS results in large scale simulations on an HPC. We saw that the recent build of Paraview has an FDSReader plugin built into VTK. What is the plan for the development of th…

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## [Nastran file import error](https://discourse.paraview.org/t/nastran-file-import-error/12893)

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**Author:** [@ksugahar](https://discourse.paraview.org/u/ksugahar)\
**Replies:** 0\
**Last updated:** [September 20, 2023, 7:10pm UTC](https://discourse.paraview.org/t/nastran-file-import-error/12893 "2023-09-20T19:10:23Z")

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We have generated 4 Nastran files using Coreform Cubit. The files with “small” in their names were exported without large options. These files can be appropriately imported to Coreform Cubit and other software as well. H…

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## [How to hide filter from menu, but still can be used in background](https://discourse.paraview.org/t/how-to-hide-filter-from-menu-but-still-can-be-used-in-background/12839)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 2\
**Last updated:** [September 16, 2023, 12:06am UTC](https://discourse.paraview.org/t/how-to-hide-filter-from-menu-but-still-can-be-used-in-background/12839 "2023-09-16T00:06:15Z")

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Dear Experts, i have a filter which is used to process some input files, i just used from programing, which is triggered by context user, but i found it will be shown in filter menu, which is not expected result. so my…

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## [Color map XML format](https://discourse.paraview.org/t/color-map-xml-format/12868)

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**Author:** [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)\
**Replies:** 2\
**Last updated:** [September 15, 2023, 5:59am UTC](https://discourse.paraview.org/t/color-map-xml-format/12868 "2023-09-15T05:59:59Z")

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Continuing the discussion from Replacement default color map and background palette: Andrew, I’ve branched this into a new topic. You are right, we should have better documentation of the XML and JSON file formats for …

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## [Hover Points/Cells Implementation](https://discourse.paraview.org/t/hover-points-cells-implementation/12853)

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**Author:** [@Michael\_Jackson](https://discourse.paraview.org/u/Michael_Jackson)\
**Replies:** 0\
**Last updated:** [September 13, 2023, 1:31pm UTC](https://discourse.paraview.org/t/hover-points-cells-implementation/12853 "2023-09-13T13:31:33Z")

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We are writing a VTK based application and would like to implement a points/cells hover capability that gives information about what is hovered. We tried a few different approaches using both vtkHardwarePicker and vtkCel…

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## [Managing filter interface elements.](https://discourse.paraview.org/t/managing-filter-interface-elements/12779)

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**Author:** [@OlegIT](https://discourse.paraview.org/u/OlegIT)\
**Replies:** 2\
**Last updated:** [September 11, 2023, 5:26am UTC](https://discourse.paraview.org/t/managing-filter-interface-elements/12779 "2023-09-11T05:26:24Z")

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I am making my own filter, in the properties of this filter it is necessary to hide / show several controls by the button (- / +), how the property itself behaves.

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## [Node Editor Overhaul](https://discourse.paraview.org/t/node-editor-overhaul/12763)

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**Author:** [@Jonas.Lukasczyk](https://discourse.paraview.org/u/Jonas.Lukasczyk)\
**Replies:** 5\
**Last updated:** [September 5, 2023, 10:14am UTC](https://discourse.paraview.org/t/node-editor-overhaul/12763 "2023-09-05T10:14:03Z")

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Hi everyone, it seems like the node editor design is heading into a different direction than my original design. For instance, the original layout was arranged from left to right, but the new layout uses top to bottom. …

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## [Using vtkm-filters in a Paraview Plugin](https://discourse.paraview.org/t/using-vtkm-filters-in-a-paraview-plugin/12771)

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**Author:** [@Jonas.Lukasczyk](https://discourse.paraview.org/u/Jonas.Lukasczyk)\
**Replies:** 9\
**Last updated:** [September 5, 2023, 8:40am UTC](https://discourse.paraview.org/t/using-vtkm-filters-in-a-paraview-plugin/12771 "2023-09-05T08:40:18Z")

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Hi everyone, I created a new Plugin for ParaView that just provides some additional vtk filters. To this end I used the paraview-src/Examples/Plugins/ElevationFilter template. Now comes the tricky part. One filter is s…

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## [Do the python binding support getting output?](https://discourse.paraview.org/t/do-the-python-binding-support-getting-output/12790)

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**Author:** [@mclarsen](https://discourse.paraview.org/u/mclarsen)\
**Replies:** 7\
**Last updated:** [September 1, 2023, 4:57pm UTC](https://discourse.paraview.org/t/do-the-python-binding-support-getting-output/12790 "2023-09-01T16:57:33Z")

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We have developed a custom reader plugin that we interact with via python. There are cases where we want to get information out from the reader. What is the best way to retrieve information from the plugin via python?

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## [plugin - input port not set up properly](https://discourse.paraview.org/t/plugin-input-port-not-set-up-properly/12175)

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**Author:** [@RR84](https://discourse.paraview.org/u/RR84)\
**Replies:** 2\
**Last updated:** [August 31, 2023, 5:48pm UTC](https://discourse.paraview.org/t/plugin-input-port-not-set-up-properly/12175 "2023-08-31T17:48:29Z")

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I want to use this plugin, as I’m the developer of it :laughing: : GitHub - zippy84/vtkbool: A new boolean operations filter for VTK When I try to use it with ParaView 5.11, it crashes with this error message: ( 32.39…

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## [numpy functions in Python Calculator](https://discourse.paraview.org/t/numpy-functions-in-python-calculator/12735)

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**Author:** [@Andy\_Bauer](https://discourse.paraview.org/u/Andy_Bauer)\
**Replies:** 9\
**Last updated:** [August 29, 2023, 6:42pm UTC](https://discourse.paraview.org/t/numpy-functions-in-python-calculator/12735 "2023-08-29T18:42:08Z")

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Hi, I’m using numpy methods in the Python Calculator but I’m getting different behavior depending on whether the input is a vtkDataSet or a vtkCompositeDataSet. The expression I’m trying out is: pythonCalculator2.Expre…

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## [Boolean property on VTKPythonAlgorithmBase with checkbox](https://discourse.paraview.org/t/boolean-property-on-vtkpythonalgorithmbase-with-checkbox/12758)

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**Author:** [@estan](https://discourse.paraview.org/u/estan)\
**Replies:** 1\
**Last updated:** [August 27, 2023, 11:38am UTC](https://discourse.paraview.org/t/boolean-property-on-vtkpythonalgorithmbase-with-checkbox/12758 "2023-08-27T11:38:32Z")

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Hi folks, We have a custom file reading Python algorithm that inherit VTKPythonAlgorithmBase. Now I’d like to offer a user-controllable boolean property on it. The user should be able to toggle it using a checkbox in P…

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## [Strange behavior of vtkExtractSelection if extract cell twice in paraview.](https://discourse.paraview.org/t/strange-behavior-of-vtkextractselection-if-extract-cell-twice-in-paraview/12695)

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**Author:** [@ironskinghost](https://discourse.paraview.org/u/ironskinghost)\
**Replies:** 1\
**Last updated:** [August 24, 2023, 12:44am UTC](https://discourse.paraview.org/t/strange-behavior-of-vtkextractselection-if-extract-cell-twice-in-paraview/12695 "2023-08-24T00:44:50Z")

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I wrote a representation of a source, selecting an area by vtkCommand::LeftButtonReleaseEvent. In EndWidgetInteraction of representation, the code flow is as below: Generate an area by vtkCellPicker. Select cells in a…

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## ["Surface With Edges" rendering goes wild when viewing multidimensional meshes](https://discourse.paraview.org/t/surface-with-edges-rendering-goes-wild-when-viewing-multidimensional-meshes/12741)

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**Author:** [@ln53](https://discourse.paraview.org/u/ln53)\
**Replies:** 2\
**Last updated:** [August 23, 2023, 3:55pm UTC](https://discourse.paraview.org/t/surface-with-edges-rendering-goes-wild-when-viewing-multidimensional-meshes/12741 "2023-08-23T15:55:09Z")

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I’ve been working with some Exodus II files containing both 2D and 3D elements (very basic example in the first image below, Exodus II file also attached). When using the “Surface With Edges” representation, every time I…

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## [vtkPVPostFilterExecutive (0x1e3ecaa0): The update extent specified in the information for output port 0 on algorithm vtkPVPostFilter (0x1f196a90)](https://discourse.paraview.org/t/vtkpvpostfilterexecutive-0x1e3ecaa0-the-update-extent-specified-in-the-information-for-output-port-0-on-algorithm-vtkpvpostfilter-0x1f196a90/12714)

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**Author:** [@bastian](https://discourse.paraview.org/u/bastian)\
**Replies:** 2\
**Last updated:** [August 22, 2023, 10:42am UTC](https://discourse.paraview.org/t/vtkpvpostfilterexecutive-0x1e3ecaa0-the-update-extent-specified-in-the-information-for-output-port-0-on-algorithm-vtkpvpostfilter-0x1f196a90/12714 "2023-08-22T10:42:27Z")

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When creating a programmable filter from two inputs with different extents I get the following, very annoying error message. (5977.475s) \[paraview \]vtkStreamingDemandDrive:878 ERR| vtkPVPostFilterExecutive (0x…

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## [Cmake error with add\_subdirectory in plugin](https://discourse.paraview.org/t/cmake-error-with-add-subdirectory-in-plugin/12717)

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**Author:** [@zetwal](https://discourse.paraview.org/u/zetwal)\
**Replies:** 4\
**Last updated:** [August 21, 2023, 2:25pm UTC](https://discourse.paraview.org/t/cmake-error-with-add-subdirectory-in-plugin/12717 "2023-08-21T14:25:53Z")

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Hello I’m working on a plugin for a reader (GenericIO) that depends on other libraries (blosc and SZ). So, in the CMakeLists.txt, I have add\_subdirectory(GIO/thirdparty), where blosc is found. Part of the CMakelists.tx…

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## [Despite not updating any extent: Programmable filter "ERROR: \[...\] The update extent specified in the information for output port \[...\] on algorithm \[...\] is \[...\], which is outside the whole extent \[...\]."](https://discourse.paraview.org/t/despite-not-updating-any-extent-programmable-filter-error-the-update-extent-specified-in-the-information-for-output-port-on-algorithm-is-which-is-outside-the-whole-extent/12143)

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**Author:** [@bastian](https://discourse.paraview.org/u/bastian)\
**Replies:** 2\
**Last updated:** [August 19, 2023, 8:26pm UTC](https://discourse.paraview.org/t/despite-not-updating-any-extent-programmable-filter-error-the-update-extent-specified-in-the-information-for-output-port-on-algorithm-is-which-is-outside-the-whole-extent/12143 "2023-08-19T20:26:45Z")

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I wrote a programmable filter which gives me the following error that I would like to get rid off: ERROR: In /builds/gitlab-kitware-sciviz-ci/build/superbuild/paraview/src/VTK/Common/ExecutionModel/vtkStreamingDemandDr…

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## [Logging support](https://discourse.paraview.org/t/logging-support/12707)

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**Author:** [@zetwal](https://discourse.paraview.org/u/zetwal)\
**Replies:** 3\
**Last updated:** [August 17, 2023, 2:07pm UTC](https://discourse.paraview.org/t/logging-support/12707 "2023-08-17T14:07:02Z")

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Hello I’m trying to use the vtkVLogF(PARAVIEW\_LOG\_PLUGIN\_VERBOSITY(), “…”); into the plugin (GenericIO Reader) that I am modifying. When I add #include "vtkPVLogger.h, I get the following error message: /home/pascal/…

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## [Coding guideline](https://discourse.paraview.org/t/coding-guideline/10649)

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**Author:** [@Fabian](https://discourse.paraview.org/u/Fabian)\
**Replies:** 3\
**Last updated:** [August 17, 2023, 9:41am UTC](https://discourse.paraview.org/t/coding-guideline/10649 "2023-08-17T09:41:28Z")

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We are happy that our CFSReader plugin got integrated and we very much appreciate the help and support of the kitware guys - with very special thanks to Mathieu but also to Ben and Cory. I offer to add to the documentat…

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## [Plug-in RenderView Object and Caption](https://discourse.paraview.org/t/plug-in-renderview-object-and-caption/12692)

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**Author:** [@Farhan](https://discourse.paraview.org/u/Farhan)\
**Replies:** 4\
**Last updated:** [August 16, 2023, 2:18pm UTC](https://discourse.paraview.org/t/plug-in-renderview-object-and-caption/12692 "2023-08-16T14:18:59Z")

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Hi experts, I am new to developing paraview (pv) plug-in and am trying to display an object with a caption in the renderview. I was able to create the below image in python VTK where I added a cylinder and an “vtkCaptio…

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## [USE\_SYSTEM\_qt not there while building Superbuild on Windows 11 | No Paraview Application](https://discourse.paraview.org/t/use-system-qt-not-there-while-building-superbuild-on-windows-11-no-paraview-application/11898)

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**Author:** [@Muhammad\_Saad\_Atique](https://discourse.paraview.org/u/Muhammad_Saad_Atique)\
**Replies:** 31\
**Last updated:** [August 16, 2023, 12:45pm UTC](https://discourse.paraview.org/t/use-system-qt-not-there-while-building-superbuild-on-windows-11-no-paraview-application/11898 "2023-08-16T12:45:43Z")

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Hi, I have followed the following steps to build superbuild: Install Visual Studio 2019 community with all C++ related tools Install cmake Install git bash Install Ninja I thought I won’t have to install Qt (which is …

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## [Is there any maximum cell/point number limitation for multi-block dataset/paraview?](https://discourse.paraview.org/t/is-there-any-maximum-cell-point-number-limitation-for-multi-block-dataset-paraview/12602)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 3\
**Last updated:** [August 16, 2023, 11:55am UTC](https://discourse.paraview.org/t/is-there-any-maximum-cell-point-number-limitation-for-multi-block-dataset-paraview/12602 "2023-08-16T11:55:35Z")

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Dear Experts, when I visualize a relative large dataset by assemblying polydata into multi-block dataset, the result is like outline view, but when I interact with the view, the result is OK. So I wander is there any l…

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## [Assign a custom vtkRenderWindowInteractor to a view](https://discourse.paraview.org/t/assign-a-custom-vtkrenderwindowinteractor-to-a-view/12699)

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**Author:** [@Mathews\_John](https://discourse.paraview.org/u/Mathews_John)\
**Replies:** 0\
**Last updated:** [August 14, 2023, 2:57pm UTC](https://discourse.paraview.org/t/assign-a-custom-vtkrenderwindowinteractor-to-a-view/12699 "2023-08-14T14:57:27Z")

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I made a custom filter in Python to plot data and interact with the data. However, the filter ends up calling the PlotData() filter within itself to achieve this. Is there a way to create a view and assign a custom inter…

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## [MapDataArrayToMultiTextureAttribute not work in paraview.](https://discourse.paraview.org/t/mapdataarraytomultitextureattribute-not-work-in-paraview/12697)

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**Author:** [@ironskinghost](https://discourse.paraview.org/u/ironskinghost)\
**Replies:** 0\
**Last updated:** [August 14, 2023, 7:34am UTC](https://discourse.paraview.org/t/mapdataarraytomultitextureattribute-not-work-in-paraview/12697 "2023-08-14T07:34:38Z")

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I made a filter to texture multiple images to one model. I use MapDataArrayToMultiTextureAttribute to implement this function. In representation of the filter, selecting an area by vtkCommand::LeftButtonReleaseEvent. …

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## [Above/Below Range Colors Setting Question: How to set up Above/Below Range Colors with VTK Python the same style as it shows in Paraview?](https://discourse.paraview.org/t/above-below-range-colors-setting-question-how-to-set-up-above-below-range-colors-with-vtk-python-the-same-style-as-it-shows-in-paraview/12696)

<div class="topic-metadata">

**Author:** [@Wenjie\_LU](https://discourse.paraview.org/u/Wenjie_LU)\
**Replies:** 0\
**Last updated:** [August 14, 2023, 6:57am UTC](https://discourse.paraview.org/t/above-below-range-colors-setting-question-how-to-set-up-above-below-range-colors-with-vtk-python-the-same-style-as-it-shows-in-paraview/12696 "2023-08-14T06:57:07Z")

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Hi everyone! I have set up ‘Above/Below Range Color’ in Color Map Editor in Paraview and two color blocks appear respetively on the top and on the bottom of the color legend, of which the color block size would not chang…

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## [warning: QGestureManager::deliverEvent: could not find the target for gesture](https://discourse.paraview.org/t/warning-qgesturemanager-could-not-find-the-target-for-gesture/12693)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 0\
**Last updated:** [August 13, 2023, 9:44am UTC](https://discourse.paraview.org/t/warning-qgesturemanager-could-not-find-the-target-for-gesture/12693 "2023-08-13T09:44:38Z")

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Dear Experts: Sometimes I received the following warning, but don’t know why: warning: In kernel\\qgesturemanager.cpp, line 681 warning: QGestureManager::deliverEvent: could not find the target for gesture

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## [About the automatization of licences concatenation](https://discourse.paraview.org/t/about-the-automatization-of-licences-concatenation/8774)

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**Author:** [@mwestphal](https://discourse.paraview.org/u/mwestphal)\
**Replies:** 6\
**Last updated:** [August 4, 2023, 7:08am UTC](https://discourse.paraview.org/t/about-the-automatization-of-licences-concatenation/8774 "2023-08-04T07:08:18Z")

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Problem ParaView/VTK contains many files of different licenses, and uses many third parties of different licenses, how can we (people building ParaView) distribute an accurate license file for the generated binaries, or …

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