# ParaView Support

**URL:** https://discourse.paraview.org/c/paraview-support/7.md?page=72

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

**Page:** 73

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## [GradientOfUnstructuredDataSet accuracy](https://discourse.paraview.org/t/gradientofunstructureddataset-accuracy/1493)

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**Author:** [@logo](https://discourse.paraview.org/u/logo)\
**Replies:** 12\
**Last updated:** [June 27, 2023, 1:58pm UTC](https://discourse.paraview.org/t/gradientofunstructureddataset-accuracy/1493 "2023-06-27T13:58:53Z")

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Hello, I am trying to compute the shear stress of a wing for viscous drag calculation. I want to match the result from fluent (same cfd data of course) as a step for further calculations. I use the filter GradientOfUnst…

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## [Problem with "cloud - lagrangian" - it is missing from the Mesh part](https://discourse.paraview.org/t/problem-with-cloud-lagrangian-it-is-missing-from-the-mesh-part/12041)

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**Author:** [@ni8](https://discourse.paraview.org/u/ni8)\
**Replies:** 9\
**Last updated:** [June 27, 2023, 8:27am UTC](https://discourse.paraview.org/t/problem-with-cloud-lagrangian-it-is-missing-from-the-mesh-part/12041 "2023-06-27T08:27:33Z")

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Hello! I downloaded ParaView 5.11.0 version and tried to visualize a case from OpenFoam 10 (\*.foam file) that includes particles. I know that I should check “cloud - lagrangian” from the Mesh Regions, and to do “Extract…

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## [Contour Filter vs ISO Volume filter](https://discourse.paraview.org/t/contour-filter-vs-iso-volume-filter/12355)

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**Author:** [@phismith](https://discourse.paraview.org/u/phismith)\
**Replies:** 2\
**Last updated:** [June 27, 2023, 2:17am UTC](https://discourse.paraview.org/t/contour-filter-vs-iso-volume-filter/12355 "2023-06-27T02:17:35Z")

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Hello, I was wondering why the surface of the contour filter is so much smoother that that of the iso volume filter? Can the same algorithm that is used to generate the surface area of the contour filter be used to gene…

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## [Plot without time moving line](https://discourse.paraview.org/t/plot-without-time-moving-line/12363)

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**Author:** [@Kei\_Yamamoto](https://discourse.paraview.org/u/Kei_Yamamoto)\
**Replies:** 4\
**Last updated:** [June 27, 2023, 1:45am UTC](https://discourse.paraview.org/t/plot-without-time-moving-line/12363 "2023-06-27T01:45:03Z")

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I have a plot over time and there is always a green line indicating the time step that I’m looking at (see attached). Is there a way to make this line disappear or change the color?

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## [Selectors in combination with duplicated block names](https://discourse.paraview.org/t/selectors-in-combination-with-duplicated-block-names/11455)

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**Author:** [@pcrepier](https://discourse.paraview.org/u/pcrepier)\
**Replies:** 1\
**Last updated:** [June 26, 2023, 3:59pm UTC](https://discourse.paraview.org/t/selectors-in-combination-with-duplicated-block-names/11455 "2023-06-26T15:59:40Z")

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Hello, I am in the process of converting my post-processing scripts to make them compatible with PV5.11. I now hit an interesting problem: I have multi-zone tecplot file that paraview reads just fine, but some of the b…

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## [Extract data from VTM multi block file at given position and convert it to a numpy array.](https://discourse.paraview.org/t/extract-data-from-vtm-multi-block-file-at-given-position-and-convert-it-to-a-numpy-array/12388)

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**Author:** [@ArminKianfar](https://discourse.paraview.org/u/ArminKianfar)\
**Replies:** 1\
**Last updated:** [June 26, 2023, 7:51am UTC](https://discourse.paraview.org/t/extract-data-from-vtm-multi-block-file-at-given-position-and-convert-it-to-a-numpy-array/12388 "2023-06-26T07:51:24Z")

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Hi, I am working on a VTM multiblock dataset. I’m trying to extract data (the field values) at given positions (Paraview requires interpolation) and convert them to a Numpy array (matrix). I’m trying to develop a Python…

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## [How to use paraview to open this open source hdf5 file, is the version of the problem?](https://discourse.paraview.org/t/how-to-use-paraview-to-open-this-open-source-hdf5-file-is-the-version-of-the-problem/12362)

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**Author:** [@qinyi\_Zhang](https://discourse.paraview.org/u/qinyi_Zhang)\
**Replies:** 4\
**Last updated:** [June 26, 2023, 2:26am UTC](https://discourse.paraview.org/t/how-to-use-paraview-to-open-this-open-source-hdf5-file-is-the-version-of-the-problem/12362 "2023-06-26T02:26:58Z")

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I would appreciate your help with the following questions! I am reproducing an open source project on gihub( sukjulian/segnn-hemodynamics: Implementation accompanying our FIMH 2023 paper (github.com)) and the author dec…

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## [Cannot open ParaView after auto-loading python plugin](https://discourse.paraview.org/t/cannot-open-paraview-after-auto-loading-python-plugin/12369)

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**Author:** [@AlexFrost](https://discourse.paraview.org/u/AlexFrost)\
**Replies:** 3\
**Last updated:** [June 23, 2023, 1:10pm UTC](https://discourse.paraview.org/t/cannot-open-paraview-after-auto-loading-python-plugin/12369 "2023-06-23T13:10:17Z")

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Hello ParaView support. Using ParaView 5.10.1 and 5.11.1, I have a Python plugin “myPythonPlugin.py” which helps me read certain file extensions inside ParaView. This plugin works fine but everytime I load it using the …

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## [how to perform Tim averaging of velocity for VTK file having variable number of computational cells](https://discourse.paraview.org/t/how-to-perform-tim-averaging-of-velocity-for-vtk-file-having-variable-number-of-computational-cells/12373)

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**Author:** [@Omar1992](https://discourse.paraview.org/u/Omar1992)\
**Replies:** 2\
**Last updated:** [June 23, 2023, 12:00pm UTC](https://discourse.paraview.org/t/how-to-perform-tim-averaging-of-velocity-for-vtk-file-having-variable-number-of-computational-cells/12373 "2023-06-23T12:00:26Z")

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Hi I have VTK output of CFD analysis and I could not perform time averaging using Temporal statistics for velocity vector components as it shows error ( the number of cells are not constant very time step). The reason…

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## [Spurious lines in volume plots](https://discourse.paraview.org/t/spurious-lines-in-volume-plots/12360)

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**Author:** [@dashp7](https://discourse.paraview.org/u/dashp7)\
**Replies:** 0\
**Last updated:** [June 22, 2023, 5:08am UTC](https://discourse.paraview.org/t/spurious-lines-in-volume-plots/12360 "2023-06-22T05:08:43Z")

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Hi, I am trying to do a volume rendering of a channel flow dataset. I am observing these spurious lines throughout the domain. Any ideas what might be causing these? Thanks in advance!

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## [SIGABRT when visualizing in paraview](https://discourse.paraview.org/t/sigabrt-when-visualizing-in-paraview/12346)

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**Author:** [@StephenGPN](https://discourse.paraview.org/u/StephenGPN)\
**Replies:** 3\
**Last updated:** [June 22, 2023, 2:47am UTC](https://discourse.paraview.org/t/sigabrt-when-visualizing-in-paraview/12346 "2023-06-22T02:47:47Z")

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Hi! I’m stuck with the following problem when trying to visualize any computation via paraFoam. Will be great if anyone could help with it.

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## [Using Point Data as Cell Centers in the Surface With Edges Visualisation](https://discourse.paraview.org/t/using-point-data-as-cell-centers-in-the-surface-with-edges-visualisation/12350)

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**Author:** [@grld](https://discourse.paraview.org/u/grld)\
**Replies:** 3\
**Last updated:** [June 22, 2023, 12:19am UTC](https://discourse.paraview.org/t/using-point-data-as-cell-centers-in-the-surface-with-edges-visualisation/12350 "2023-06-22T00:19:37Z")

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Dear community, I would like to use ParaView to inspect the results I obtain from a cell-centered solver. The results obtained from the solver correspond to the midpoints of cubic volumes. However, ParaView interprets t…

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## [Histogram 'calculate average' bug?](https://discourse.paraview.org/t/histogram-calculate-average-bug/5100)

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**Author:** [@dannykhf](https://discourse.paraview.org/u/dannykhf)\
**Replies:** 3\
**Last updated:** [June 21, 2023, 3:44pm UTC](https://discourse.paraview.org/t/histogram-calculate-average-bug/5100 "2023-06-21T15:44:44Z")

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It notice in Paraview 5.8 that when I use histogram and the calculate average option after a clip, the calculate average data would return junk if the bin size is large enough. Is this a bug? Data looks ok in the histog…

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## [Is it possible to debug Paraview by vscode (or some other IDE except visual studio)?](https://discourse.paraview.org/t/is-it-possible-to-debug-paraview-by-vscode-or-some-other-ide-except-visual-studio/12344)

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**Author:** [@Lake\_Lagunita](https://discourse.paraview.org/u/Lake_Lagunita)\
**Replies:** 2\
**Last updated:** [June 20, 2023, 9:46pm UTC](https://discourse.paraview.org/t/is-it-possible-to-debug-paraview-by-vscode-or-some-other-ide-except-visual-studio/12344 "2023-06-20T21:46:46Z")

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Hi, I am a new learner of Paraview and I would like to learn it through breakPoints and debugging. I followed the building tutorials here and by changing -DCMAKE\_BUILD\_TYPE=Release to -DCMAKE\_BUILD\_TYPE=Debug, I suppose …

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## [point gaussian](https://discourse.paraview.org/t/point-gaussian/12340)

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**Author:** [@ejlee](https://discourse.paraview.org/u/ejlee)\
**Replies:** 0\
**Last updated:** [June 20, 2023, 6:26am UTC](https://discourse.paraview.org/t/point-gaussian/12340 "2023-06-20T06:26:56Z")

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Is there any explanation for point gaussian? I wonder if making the point Gaussian radius equal to the particle size makes it look the same as the analytical particle size.

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## [Issue with representing particle trajectories - ParaView Particlepath, Particletracer](https://discourse.paraview.org/t/issue-with-representing-particle-trajectories-paraview-particlepath-particletracer/12336)

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**Author:** [@Taha](https://discourse.paraview.org/u/Taha)\
**Replies:** 2\
**Last updated:** [June 19, 2023, 5:12pm UTC](https://discourse.paraview.org/t/issue-with-representing-particle-trajectories-paraview-particlepath-particletracer/12336 "2023-06-19T17:12:24Z")

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Hello, I am new to paraview and I am encountering issues to present particle trajectories from lagrangian data. I have .dat files with multiple timesteps with the following structure (similar to tecplot files) : TITLE…

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## [Can paraview measure the characteristic length of the figure of two phase system?](https://discourse.paraview.org/t/can-paraview-measure-the-characteristic-length-of-the-figure-of-two-phase-system/12335)

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**Author:** [@abc123](https://discourse.paraview.org/u/abc123)\
**Replies:** 0\
**Last updated:** [June 19, 2023, 4:05pm UTC](https://discourse.paraview.org/t/can-paraview-measure-the-characteristic-length-of-the-figure-of-two-phase-system/12335 "2023-06-19T16:05:38Z")

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Hi everyone, I have a question about figure analysis of using paraview. Can paraview measure the characteristic length of the figure of two phase system? The following figures are generated by Phase field simulation a…

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## [Gradient and ComputeDerivatives gave different results](https://discourse.paraview.org/t/gradient-and-computederivatives-gave-different-results/12328)

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**Author:** [@Gening\_Dong](https://discourse.paraview.org/u/Gening_Dong)\
**Replies:** 2\
**Last updated:** [June 19, 2023, 1:07pm UTC](https://discourse.paraview.org/t/gradient-and-computederivatives-gave-different-results/12328 "2023-06-19T13:07:39Z")

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Hi, I’m trying to compute the gradient of displacement. I used Gradient and ComputeDerivatives, however, they gave me different results. I’m wondering what’s the “more correct” one and why they computed differently. My…

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## [combine vtk group](https://discourse.paraview.org/t/combine-vtk-group/12285)

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**Author:** [@m.enayat](https://discourse.paraview.org/u/m.enayat)\
**Replies:** 2\
**Last updated:** [June 19, 2023, 11:48am UTC](https://discourse.paraview.org/t/combine-vtk-group/12285 "2023-06-19T11:48:51Z")

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Hi I have a group of .vtk files that are related to a 3D mesh. My mesh is split into 320 .vtk files each of which had been processed by a core. I want to merge these .vtk files and assemble my whole mesh. What should …

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## [Memory Leak in Python paraview.servermanager.Fetch() (Paraview 5.10.1)](https://discourse.paraview.org/t/memory-leak-in-python-paraview-servermanager-fetch-paraview-5-10-1/12319)

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**Author:** [@rdvanvalderen](https://discourse.paraview.org/u/rdvanvalderen)\
**Replies:** 2\
**Last updated:** [June 19, 2023, 9:54am UTC](https://discourse.paraview.org/t/memory-leak-in-python-paraview-servermanager-fetch-paraview-5-10-1/12319 "2023-06-19T09:54:48Z")

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Hi, I am currently using the python Paraview API to analyze CFD results (.vti files), where I just want to do simple operations and visualizations of the cell data (velocities, pressure etc.). To do this, I am using the…

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## [Save a .CSV file with all time steps in the same file](https://discourse.paraview.org/t/save-a-csv-file-with-all-time-steps-in-the-same-file/12330)

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**Author:** [@NPeralta](https://discourse.paraview.org/u/NPeralta)\
**Replies:** 1\
**Last updated:** [June 19, 2023, 8:01am UTC](https://discourse.paraview.org/t/save-a-csv-file-with-all-time-steps-in-the-same-file/12330 "2023-06-19T08:01:46Z")

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I am saving the data set of a particle tracking field, the problem is that I want all the information of these particles in just one csv and not in many files of every timestep.

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## [Iterate through tensor in paraview programable filter](https://discourse.paraview.org/t/iterate-through-tensor-in-paraview-programable-filter/12290)

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**Author:** [@Trailer1](https://discourse.paraview.org/u/Trailer1)\
**Replies:** 2\
**Last updated:** [June 17, 2023, 1:03pm UTC](https://discourse.paraview.org/t/iterate-through-tensor-in-paraview-programable-filter/12290 "2023-06-17T13:03:21Z")

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Hello, I would like to iterate over a tensor in paraview to compute its eigenvalues and eigenvectors. But currently I am unable to do so. I have: import numpy as np input0 = inputs\[0\] data = input0.CellData\["tau"\] n…

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## [Facing problem in plotting side view or top view of velocity of fluid past through a cylinder](https://discourse.paraview.org/t/facing-problem-in-plotting-side-view-or-top-view-of-velocity-of-fluid-past-through-a-cylinder/12233)

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**Author:** [@qaz](https://discourse.paraview.org/u/qaz)\
**Replies:** 17\
**Last updated:** [June 17, 2023, 11:51am UTC](https://discourse.paraview.org/t/facing-problem-in-plotting-side-view-or-top-view-of-velocity-of-fluid-past-through-a-cylinder/12233 "2023-06-17T11:51:38Z")

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Hello everyone I want to plot such a side view plot for velocity. How I can plot it in paraview ? The side of pvd file is more than 4mb. I can’t able to upload it. Help me in plotting this side view or top view.

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## [Cannot save any animation file or a screenshot](https://discourse.paraview.org/t/cannot-save-any-animation-file-or-a-screenshot/9846)

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**Author:** [@Muhammed\_Eroglu](https://discourse.paraview.org/u/Muhammed_Eroglu)\
**Replies:** 2\
**Last updated:** [June 15, 2023, 9:59am UTC](https://discourse.paraview.org/t/cannot-save-any-animation-file-or-a-screenshot/9846 "2023-06-15T09:59:10Z")

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Hi everyone. I made a simulation using Fenics.After that i got an output as a .pvd file with 200 .vtu files .I opened that pvd file in Paraview and tried to save animation as .png files.It gives me an error like; ERROR…

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## [Error building 5.11.1 in Apptainer with superbuild](https://discourse.paraview.org/t/error-building-5-11-1-in-apptainer-with-superbuild/12270)

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**Author:** [@woodscn](https://discourse.paraview.org/u/woodscn)\
**Replies:** 9\
**Last updated:** [June 14, 2023, 11:21pm UTC](https://discourse.paraview.org/t/error-building-5-11-1-in-apptainer-with-superbuild/12270 "2023-06-14T23:21:36Z")

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I’ve been working on putting together a containerized version of paraview using apptainer, based on the old singularity build script. It runs into trouble when trying to actually build paraview: \[ 96%\] Performing config…

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## [H5 File Example](https://discourse.paraview.org/t/h5-file-example/10596)

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**Author:** [@Erume](https://discourse.paraview.org/u/Erume)\
**Replies:** 1\
**Last updated:** [June 14, 2023, 8:08am UTC](https://discourse.paraview.org/t/h5-file-example/10596 "2023-06-14T08:08:17Z")

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Hello, I am trying to convert a “.dat” mesh file (Tecplot can read that “.dat” file.) into a “.h5” mesh file. However, I don’t know the structure of a “.h5” file Paraview can read. Can anyone upload a “.h5” file that ca…

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## [Particle number in cells](https://discourse.paraview.org/t/particle-number-in-cells/12315)

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**Author:** [@nor\_nur](https://discourse.paraview.org/u/nor_nur)\
**Replies:** 0\
**Last updated:** [June 14, 2023, 6:11am UTC](https://discourse.paraview.org/t/particle-number-in-cells/12315 "2023-06-14T06:11:01Z")

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I want to determine the number of particles that occupy each cell and convert it to a scalar for every time step. In this way, I could determine particle distribution in cells or regions. Is it even possible in ParaView? …

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## [About the velocity vector visualization of lagrangian data](https://discourse.paraview.org/t/about-the-velocity-vector-visualization-of-lagrangian-data/12295)

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**Author:** [@t45454](https://discourse.paraview.org/u/t45454)\
**Replies:** 4\
**Last updated:** [June 14, 2023, 1:01am UTC](https://discourse.paraview.org/t/about-the-velocity-vector-visualization-of-lagrangian-data/12295 "2023-06-14T01:01:19Z")

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Hi all, I was trying to visualize the velocity field of Lagrangian data and met a problem. Is it possible to add velocity vector arrows on each particle, to better visualize the particle flow pattern? I tried Lagrangian…

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## [Different two colormaps not overlapped.](https://discourse.paraview.org/t/different-two-colormaps-not-overlapped/12287)

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**Author:** [@Gwang-Jin\_Lee](https://discourse.paraview.org/u/Gwang-Jin_Lee)\
**Replies:** 0\
**Last updated:** [June 12, 2023, 8:23am UTC](https://discourse.paraview.org/t/different-two-colormaps-not-overlapped/12287 "2023-06-12T08:23:16Z")

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Hello, I’m using ParaView 5.11 version in Windows 10, Ubuntu 16, and MacOS 10.15. And I met an error and a solution. I attached my data and shared how to reproduce. Load export01.pvd (wind data) Calculator : Define ve…

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## [Missing header files](https://discourse.paraview.org/t/missing-header-files/12117)

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**Author:** [@EdK](https://discourse.paraview.org/u/EdK)\
**Replies:** 4\
**Last updated:** [June 14, 2023, 12:50am UTC](https://discourse.paraview.org/t/missing-header-files/12117 "2023-06-14T00:50:40Z")

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I am trying to build ParaView with Catalyst and Python enabled. My compilation is successful, but an application that includes some ParaView header files gets stuck because some expected files are not found. For example,…

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