# Development

**URL:** https://discourse.paraview.org/c/development/6.md?no_subcategories=false&page=30

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

**Page:** 31

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## [Set a user defined lookup table to replace default "Cool to Warm"](https://discourse.paraview.org/t/set-a-user-defined-lookup-table-to-replace-default-cool-to-warm/2847)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 10\
**Last updated:** [December 2, 2019, 12:15pm UTC](https://discourse.paraview.org/t/set-a-user-defined-lookup-table-to-replace-default-cool-to-warm/2847 "2019-12-02T12:15:40Z")

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Dear Expert, I found the default lookup table is “Cool to Warm”, How can i change this default one into “hsv”. And further, i want to use a user specific defined lookup table, how can i do it in programmatic way , to …

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## [PLOT3D reader doesn't read function data](https://discourse.paraview.org/t/plot3d-reader-doesnt-read-function-data/1167)

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**Author:** [@elynch](https://discourse.paraview.org/u/elynch)\
**Replies:** 1\
**Last updated:** [November 29, 2019, 6:25pm UTC](https://discourse.paraview.org/t/plot3d-reader-doesnt-read-function-data/1167 "2019-11-29T18:25:50Z")

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In version 5.6.0, the PLOT3D reader won’t read variables from my function file unless I also read the q file. I don’t need any of the data in the q file and would prefer not to read it. In the attached example, paravie…

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## [Indicate version for \`VTKPythonAlgorithmBase\`-based Python plugin](https://discourse.paraview.org/t/indicate-version-for-vtkpythonalgorithmbase-based-python-plugin/3055)

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**Author:** [@tianyikillua](https://discourse.paraview.org/u/tianyikillua)\
**Replies:** 5\
**Last updated:** [November 28, 2019, 2:52pm UTC](https://discourse.paraview.org/t/indicate-version-for-vtkpythonalgorithmbase-based-python-plugin/3055 "2019-11-28T14:52:39Z")

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I’ve been developing plugins for ParaView using the new VTKPythonAlgorithmBase interface. Is it possible to indicate the version in the Python file? Currently the version is always (unknown)

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## [Executing custom applications examples](https://discourse.paraview.org/t/executing-custom-applications-examples/3015)

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**Author:** [@maria\_vlas](https://discourse.paraview.org/u/maria_vlas)\
**Replies:** 12\
**Last updated:** [November 26, 2019, 9:17am UTC](https://discourse.paraview.org/t/executing-custom-applications-examples/3015 "2019-11-26T09:17:19Z")

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I’m researching making a Qt-based desktop application to use Paraview framework and make a simpler ParaView GUI. The documentation says that there are some examples here https://gitlab.kitware.com/paraview/paraview/tree…

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## [Bad file descriptor error](https://discourse.paraview.org/t/bad-file-descriptor-error/3037)

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**Author:** [@bastian](https://discourse.paraview.org/u/bastian)\
**Replies:** 1\
**Last updated:** [November 25, 2019, 12:42pm UTC](https://discourse.paraview.org/t/bad-file-descriptor-error/3037 "2019-11-25T12:42:12Z")

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I am trying to get Paraview to run on an HPC Linux server. Calling either pvpython or pvbatch from any of the two most recent pre-compiled versions ParaView-5.7.0-osmesa-MPI-Linux-Python3.7-64bit and ParaView-5.7.0-MP…

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## [Use external lib in vkt filter](https://discourse.paraview.org/t/use-external-lib-in-vkt-filter/3010)

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**Author:** [@SimonFuet](https://discourse.paraview.org/u/SimonFuet)\
**Replies:** 2\
**Last updated:** [November 20, 2019, 12:24pm UTC](https://discourse.paraview.org/t/use-external-lib-in-vkt-filter/3010 "2019-11-20T12:24:48Z")

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Hi all, I’va created a C++ ParaView plugin containing a vtk filter. This filter uses (includes) a library (as a git submodule). In the CMakeLists.txt, I’ve added the directory of the library (with the add\_subdirectory …

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## [How does Paraview compute spatial derivatives at boundaries](https://discourse.paraview.org/t/how-does-paraview-compute-spatial-derivatives-at-boundaries/2986)

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**Author:** [@kevinw](https://discourse.paraview.org/u/kevinw)\
**Replies:** 2\
**Last updated:** [November 18, 2019, 1:04pm UTC](https://discourse.paraview.org/t/how-does-paraview-compute-spatial-derivatives-at-boundaries/2986 "2019-11-18T13:04:00Z")

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Hi, I am using the “Gradient of Unstructured Data Set” filter to calculate the curl and divergence of a 3D field. How does Paraview compute the derivatives on domain boundaries? In my case, one boundary of the domain (…

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## [Reader with variable output data type](https://discourse.paraview.org/t/reader-with-variable-output-data-type/2971)

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**Author:** [@cobo](https://discourse.paraview.org/u/cobo)\
**Replies:** 3\
**Last updated:** [November 18, 2019, 9:51am UTC](https://discourse.paraview.org/t/reader-with-variable-output-data-type/2971 "2019-11-18T09:51:48Z")

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Trying to write a DXF reader that generates output data of a type that depends on the data it was reading from the file. So far I am having a DXF reader that is ported from the ParaViewGeo project. It reads DXF data fil…

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## [Possible backport to solve OpenGL problems in 5.7 with Intel graphic cards?](https://discourse.paraview.org/t/possible-backport-to-solve-opengl-problems-in-5-7-with-intel-graphic-cards/2961)

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**Author:** [@cobo](https://discourse.paraview.org/u/cobo)\
**Replies:** 12\
**Last updated:** [November 14, 2019, 4:15pm UTC](https://discourse.paraview.org/t/possible-backport-to-solve-opengl-problems-in-5-7-with-intel-graphic-cards/2961 "2019-11-14T16:15:39Z")

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On a new Lenovo T590 notebook with Intel UHD Graphics 620, the volume representation is not any more working in PV 5.7. When I showed this in the general PV support forum (here) I was told by Cory Quamman that a) this is…

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## [Making a desktop app using the ParaView framework](https://discourse.paraview.org/t/making-a-desktop-app-using-the-paraview-framework/2973)

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**Author:** [@maria\_vlas](https://discourse.paraview.org/u/maria_vlas)\
**Replies:** 2\
**Last updated:** [November 13, 2019, 9:05pm UTC](https://discourse.paraview.org/t/making-a-desktop-app-using-the-paraview-framework/2973 "2019-11-13T21:05:42Z")

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Hello I want to make a desktop app using the ParaView framework. I basically want to make a simpler ParaView GUI. I want to know if this gui has to be Qt-based or I can use any kind of technology. Thanks

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## [Split mesh and field data in a pvtu file](https://discourse.paraview.org/t/split-mesh-and-field-data-in-a-pvtu-file/2950)

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**Author:** [@ssss](https://discourse.paraview.org/u/ssss)\
**Replies:** 1\
**Last updated:** [November 12, 2019, 9:42am UTC](https://discourse.paraview.org/t/split-mesh-and-field-data-in-a-pvtu-file/2950 "2019-11-12T09:42:00Z")

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Hi everyone! I am currently working in the development of a CFD code which outputs pvtu files with cell mesh and field data. However, every of this pvtu/vtu files holds the complete mesh and field data. As in most of th…

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## [Plugins depending on other plugins problem](https://discourse.paraview.org/t/plugins-depending-on-other-plugins-problem/2901)

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**Author:** [@cobo](https://discourse.paraview.org/u/cobo)\
**Replies:** 3\
**Last updated:** [November 9, 2019, 5:12am UTC](https://discourse.paraview.org/t/plugins-depending-on-other-plugins-problem/2901 "2019-11-09T05:12:13Z")

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This is a problem that I currently did not expect - because so far it worked for me! But I did some renaming, and that might have caused the issue to appear now. Some of my plugins are derived from some others from my o…

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## [How to transform a model with pqPipelineSource](https://discourse.paraview.org/t/how-to-transform-a-model-with-pqpipelinesource/2928)

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**Author:** [@RisingYoung-Learn](https://discourse.paraview.org/u/RisingYoung-Learn)\
**Replies:** 4\
**Last updated:** [November 7, 2019, 11:30am UTC](https://discourse.paraview.org/t/how-to-transform-a-model-with-pqpipelinesource/2928 "2019-11-07T11:30:35Z")

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Hello, I got a cube pqPipelineSource, I need to transform it now (eg: rotation), I can transform by getting vtkActor; but ParaView is very well isolated from VTK data. In response to this situation, what does ParaView r…

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## [InputModeling+Solver+ParaView: A task for Catalyst or for a custom ParaView app?](https://discourse.paraview.org/t/inputmodeling-solver-paraview-a-task-for-catalyst-or-for-a-custom-paraview-app/2910)

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**Author:** [@cesss](https://discourse.paraview.org/u/cesss)\
**Replies:** 1\
**Last updated:** [November 7, 2019, 9:45am UTC](https://discourse.paraview.org/t/inputmodeling-solver-paraview-a-task-for-catalyst-or-for-a-custom-paraview-app/2910 "2019-11-07T09:45:23Z")

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I’m writing a simulation whose input can be created with a simple GUI (a minimal GUI for importing 3D meshes, tweaking about 5 meshing parameters, and setting a few scalar properties for each mesh --ie: think something y…

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## [Timestep information not transferred by vtkPVGeometryFilter](https://discourse.paraview.org/t/timestep-information-not-transferred-by-vtkpvgeometryfilter/2593)

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**Author:** [@kvankooten](https://discourse.paraview.org/u/kvankooten)\
**Replies:** 5\
**Last updated:** [November 6, 2019, 12:04pm UTC](https://discourse.paraview.org/t/timestep-information-not-transferred-by-vtkpvgeometryfilter/2593 "2019-11-06T12:04:15Z")

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I’ve found that for PV pipeline sources other than vtkPolyDatas, I cannot access the vtkDataObject::DATA\_TIME\_STEP() information in the corresponding vtkPolyData representation in the vtkRenderer. Therefore, I currently …

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## [Cell selection function principle in paraview in order to migrate it to other vtk project](https://discourse.paraview.org/t/cell-selection-function-principle-in-paraview-in-order-to-migrate-it-to-other-vtk-project/2868)

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**Author:** [@vector](https://discourse.paraview.org/u/vector)\
**Replies:** 2\
**Last updated:** [October 29, 2019, 4:21pm UTC](https://discourse.paraview.org/t/cell-selection-function-principle-in-paraview-in-order-to-migrate-it-to-other-vtk-project/2868 "2019-10-29T16:21:41Z")

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I want to read the cell id inside vtkUnstructuredGrid.But vtkCellPicker works very slowly.I want to use vtk to implement the “hover cells on” function of paraview software in vtkUnstructuredGrid to get the cell id. But …

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## [What is this trying to tell us? Something with readers and writers - but what?](https://discourse.paraview.org/t/what-is-this-trying-to-tell-us-something-with-readers-and-writers-but-what/2889)

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**Author:** [@cobo](https://discourse.paraview.org/u/cobo)\
**Replies:** 3\
**Last updated:** [November 3, 2019, 10:43am UTC](https://discourse.paraview.org/t/what-is-this-trying-to-tell-us-something-with-readers-and-writers-but-what/2889 "2019-11-03T10:43:44Z")

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My Paraview custom application is now regularly starting with a message that I cannot understand! It even tells me where it happens, and this is what I find there: // Give a warning that if there is ParaViewReaders or…

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## [Contribution including VTK filter](https://discourse.paraview.org/t/contribution-including-vtk-filter/2884)

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**Author:** [@SimonFuet](https://discourse.paraview.org/u/SimonFuet)\
**Replies:** 7\
**Last updated:** [November 1, 2019, 1:49pm UTC](https://discourse.paraview.org/t/contribution-including-vtk-filter/2884 "2019-11-01T13:49:26Z")

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Hi all, I need an ImageData source (from just an origin, number of cells and size of cells (or grid extent). From what I’ve seen there isn’t any yet, so I’m going to create one (there’s not much work). It should be a f…

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## [Superbuild: one project working, similar project not](https://discourse.paraview.org/t/superbuild-one-project-working-similar-project-not/2869)

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**Author:** [@cobo](https://discourse.paraview.org/u/cobo)\
**Replies:** 6\
**Last updated:** [October 29, 2019, 3:08pm UTC](https://discourse.paraview.org/t/superbuild-one-project-working-similar-project-not/2869 "2019-10-29T15:08:46Z")

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One of my projects (derived from Paraview and including some additional modules and plugins) seems to work now also with the “superbuild” for generating a Windows installation package. From what I understand so far, the…

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## [OpenVR Pause and Grab](https://discourse.paraview.org/t/openvr-pause-and-grab/2855)

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**Author:** [@evmasuta](https://discourse.paraview.org/u/evmasuta)\
**Replies:** 3\
**Last updated:** [October 28, 2019, 6:28pm UTC](https://discourse.paraview.org/t/openvr-pause-and-grab/2855 "2019-10-28T18:28:52Z")

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Dear all, Hello, I am conducting research on rendering blood velocity vectors onto magnetic resonance imaging movies in VR. I recently started using ParaView with the OpenVR plugin and have been blown away by its perfo…

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## [Superbuild USE\_SYSTEM\_ flags not working properly](https://discourse.paraview.org/t/superbuild-use-system-flags-not-working-properly/2824)

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**Author:** [@cobo](https://discourse.paraview.org/u/cobo)\
**Replies:** 13\
**Last updated:** [October 28, 2019, 4:33pm UTC](https://discourse.paraview.org/t/superbuild-use-system-flags-not-working-properly/2824 "2019-10-28T16:33:16Z")

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This is probably more an “issue”, but at the moment it is a question - because I want to get this working! Symptom: I managed to finish my PV custom application with plugins so that it runs locally. Then I managed to ge…

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## [Concept question regarding plugins and modules - again](https://discourse.paraview.org/t/concept-question-regarding-plugins-and-modules-again/2800)

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**Author:** [@cobo](https://discourse.paraview.org/u/cobo)\
**Replies:** 1\
**Last updated:** [October 21, 2019, 6:27am UTC](https://discourse.paraview.org/t/concept-question-regarding-plugins-and-modules-again/2800 "2019-10-21T06:27:06Z")

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After a lot of research, things are getting gradually more with the new plugin/module concept of PV 5.7 - not only regarding “how to get things done”, but also regarding the logic behind it. Still I am coming back to a …

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## [Automatic documentation generation for plugins of custom application](https://discourse.paraview.org/t/automatic-documentation-generation-for-plugins-of-custom-application/2766)

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**Author:** [@cobo](https://discourse.paraview.org/u/cobo)\
**Replies:** 2\
**Last updated:** [October 17, 2019, 7:50pm UTC](https://discourse.paraview.org/t/automatic-documentation-generation-for-plugins-of-custom-application/2766 "2019-10-17T19:50:30Z")

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In my custom application with custom plugins I managed to make the documentation generation of Paraview work also for my own plugins - mostly! I just followed more or less the example of how it is done with Paraview itse…

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## [First own plugin integrated into custom app based on PV 5.7 RC2](https://discourse.paraview.org/t/first-own-plugin-integrated-into-custom-app-based-on-pv-5-7-rc2/2495)

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**Author:** [@cobo](https://discourse.paraview.org/u/cobo)\
**Replies:** 3\
**Last updated:** [October 17, 2019, 7:49pm UTC](https://discourse.paraview.org/t/first-own-plugin-integrated-into-custom-app-based-on-pv-5-7-rc2/2495 "2019-10-17T19:49:15Z")

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At the end of this post I come to a likely mistake in the current new RC2 build setup. Before that I am just explaining some of the obstacles that a “user developer” may run into if he tries to work with the new build s…

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## [custom paraview module - How to generate embedded doc](https://discourse.paraview.org/t/custom-paraview-module-how-to-generate-embedded-doc/2686)

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**Author:** [@michal.wozniak](https://discourse.paraview.org/u/michal.wozniak)\
**Replies:** 2\
**Last updated:** [October 17, 2019, 7:21pm UTC](https://discourse.paraview.org/t/custom-paraview-module-how-to-generate-embedded-doc/2686 "2019-10-17T19:21:32Z")

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Hi, I created a new vtk module and I used the following function to append my filters.xmls set(classes testClass ) set(xml\_files Resources/test\_filters.xml) vtk\_module\_add\_module(ParaView::TestModule …

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## [Gitlab, sha512 and images files](https://discourse.paraview.org/t/gitlab-sha512-and-images-files/2529)

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**Author:** [@mwestphal](https://discourse.paraview.org/u/mwestphal)\
**Replies:** 4\
**Last updated:** [October 17, 2019, 2:16pm UTC](https://discourse.paraview.org/t/gitlab-sha512-and-images-files/2529 "2019-10-17T14:16:50Z")

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I know this is a long shot, but here goes. Gitlab has some awesome image comparison builtin diff, that looks like this : Would there be a way to inform gitlab that it can, instead of only showing sha512 number for t…

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## [Modules and Plugins question](https://discourse.paraview.org/t/modules-and-plugins-question/2522)

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**Author:** [@cobo](https://discourse.paraview.org/u/cobo)\
**Replies:** 9\
**Last updated:** [October 17, 2019, 2:14pm UTC](https://discourse.paraview.org/t/modules-and-plugins-question/2522 "2019-10-17T14:14:23Z")

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This is again a concept question regarding the new project setup for version 5.7. My very first expectation was that if I can define “modules”, these could contain a number of “plugins”, eg. if they are actually a set o…

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## [building paraview - ffmpeg deprecated library- cmake isnt finding python and fortran](https://discourse.paraview.org/t/building-paraview-ffmpeg-deprecated-library-cmake-isnt-finding-python-and-fortran/2776)

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**Author:** [@hgropelli](https://discourse.paraview.org/u/hgropelli)\
**Replies:** 11\
**Last updated:** [October 17, 2019, 1:57pm UTC](https://discourse.paraview.org/t/building-paraview-ffmpeg-deprecated-library-cmake-isnt-finding-python-and-fortran/2776 "2019-10-17T13:57:56Z")

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for ffmpeg: https://gitlab.kitware.com/paraview/paraview/issues/19397 https://patchwork.ffmpeg.org/patch/6959/ when building paraview cmake doesnt detect python 3, fortran and “opengl-xmesa”. how to proceed? im runnin…

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## [Plugin with only property widgets](https://discourse.paraview.org/t/plugin-with-only-property-widgets/2610)

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**Author:** [@cobo](https://discourse.paraview.org/u/cobo)\
**Replies:** 4\
**Last updated:** [October 17, 2019, 1:47pm UTC](https://discourse.paraview.org/t/plugin-with-only-property-widgets/2610 "2019-10-17T13:47:44Z")

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Still struggling with building a lot of plugins and modules with the new version 5.7 build setup. The current construction site is a plugin that contains a number of property widgets, plus one “decorator”, to be used by…

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## [Wrapping Filter of Plugin](https://discourse.paraview.org/t/wrapping-filter-of-plugin/1875)

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**Author:** [@leonharv](https://discourse.paraview.org/u/leonharv)\
**Replies:** 1\
**Last updated:** [October 17, 2019, 1:40pm UTC](https://discourse.paraview.org/t/wrapping-filter-of-plugin/1875 "2019-10-17T13:40:20Z")

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Hi, I wrote a plugin, which delivers a filter in C++. Now I would like to wrap my plugin with python. My file-structure looks like this: CMakeLists.txt Plugin paraview.plugin CMakeLists.txt Filter CMakeLists.txt vtk…

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