# ParaView Support

**URL:** https://discourse.paraview.org/c/paraview-support/7.md?page=23

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

**Page:** 24

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## [seg fault crash when loading many vtu files](https://discourse.paraview.org/t/seg-fault-crash-when-loading-many-vtu-files/16129)

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**Author:** [@hieu325](https://discourse.paraview.org/u/hieu325)\
**Replies:** 0\
**Last updated:** [February 7, 2025, 10:49am UTC](https://discourse.paraview.org/t/seg-fault-crash-when-loading-many-vtu-files/16129 "2025-02-07T10:49:58Z")

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Dear ParaView user community, I am having seg fault problem when loading large dataset, \>2GB containing 50M grid cells distributed over many vtu files, using GPU local rendering. Strangely, cpu local rendering with Mesa…

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## [How to change the index of the first point for plotting](https://discourse.paraview.org/t/how-to-change-the-index-of-the-first-point-for-plotting/16122)

<div class="topic-metadata">

**Author:** [@s1291](https://discourse.paraview.org/u/s1291)\
**Replies:** 4\
**Last updated:** [February 7, 2025, 10:15am UTC](https://discourse.paraview.org/t/how-to-change-the-index-of-the-first-point-for-plotting/16122 "2025-02-07T10:15:41Z")

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Hello, I have the following set of vertex cells as shown in the screenshot below: These vertex cells are ordered counter-clockwise as indicated (notice the cells with index 0, 1, … 13, … etc). When I use the “Plot …

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## [How define new origin and scaling for 3D mesh?](https://discourse.paraview.org/t/how-define-new-origin-and-scaling-for-3d-mesh/16128)

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**Author:** [@juanita.BT](https://discourse.paraview.org/u/juanita.BT)\
**Replies:** 0\
**Last updated:** [February 7, 2025, 9:08am UTC](https://discourse.paraview.org/t/how-define-new-origin-and-scaling-for-3d-mesh/16128 "2025-02-07T09:08:59Z")

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Hi all, I’m creating a 3D mesh in Paraview based on a tiff image. The bounds and origin is defined by default to a scale and place I don’t want it. I heard that the transform filter can be used to help with that problem…

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## [Copy New Active Selection using pvpython](https://discourse.paraview.org/t/copy-new-active-selection-using-pvpython/16117)

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**Author:** [@sherin.sugathan](https://discourse.paraview.org/u/sherin.sugathan)\
**Replies:** 4\
**Last updated:** [February 6, 2025, 10:18pm UTC](https://discourse.paraview.org/t/copy-new-active-selection-using-pvpython/16117 "2025-02-06T22:18:02Z")

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Dear Support! I have a static\_FC.vtk file (attached). After loading it in ParaView, I use an ExtractionSelection filter on it to capture user selected cells. This is working fine but in my workflow, the user will be mak…

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## [Is there a setting to attempt to keep ParaView alive after a server disconnect?](https://discourse.paraview.org/t/is-there-a-setting-to-attempt-to-keep-paraview-alive-after-a-server-disconnect/16106)

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**Author:** [@GregVernon](https://discourse.paraview.org/u/GregVernon)\
**Replies:** 3\
**Last updated:** [February 6, 2025, 8:14am UTC](https://discourse.paraview.org/t/is-there-a-setting-to-attempt-to-keep-paraview-alive-after-a-server-disconnect/16106 "2025-02-06T08:14:25Z")

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I often run into the issue where ParaView client/server will disconnect for some reason, e.g., put my client (laptop) to sleep/hibernate, WiFi network blips / changes. Whenever the server disconnects, you get the messag…

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## [Selection for ExtractSelection not saved in state](https://discourse.paraview.org/t/selection-for-extractselection-not-saved-in-state/16113)

<div class="topic-metadata">

**Author:** [@alwaysonemorebug](https://discourse.paraview.org/u/alwaysonemorebug)\
**Replies:** 2\
**Last updated:** [February 5, 2025, 10:53pm UTC](https://discourse.paraview.org/t/selection-for-extractselection-not-saved-in-state/16113 "2025-02-05T22:53:51Z")

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The topic is a known bug and was discussed in the past, but I cannot get the proposed workaround to work. Situation: My pipeline is created by a Python script. To work on a subset of the data, I use QuerySelect followe…

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## [pvbatch on Windows uses many CPU cores by default?](https://discourse.paraview.org/t/pvbatch-on-windows-uses-many-cpu-cores-by-default/16111)

<div class="topic-metadata">

**Author:** [@s1291](https://discourse.paraview.org/u/s1291)\
**Replies:** 12\
**Last updated:** [February 5, 2025, 4:34pm UTC](https://discourse.paraview.org/t/pvbatch-on-windows-uses-many-cpu-cores-by-default/16111 "2025-02-05T16:34:15Z")

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Hi, I have ParaView 5.13.2 (I downloaded ParaView-5.13.2-MPI-Windows-Python3.10-msvc2017-AMD64.msi from the official website) installed on Windows 11. When I try to use pvbatch to render an orbit around a box (.py stat…

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## [ParaView in Headless Mode with OSMesa, EGL, and libX11](https://discourse.paraview.org/t/paraview-in-headless-mode-with-osmesa-egl-and-libx11/16109)

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**Author:** [@s1291](https://discourse.paraview.org/u/s1291)\
**Replies:** 5\
**Last updated:** [February 5, 2025, 1:26pm UTC](https://discourse.paraview.org/t/paraview-in-headless-mode-with-osmesa-egl-and-libx11/16109 "2025-02-05T13:26:13Z")

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Is it possible to compile a single version of ParaView that supports OSMesa, EGL, and libX11 at the same time? I ask because I recall seeing a version of ParaView on an HPC cluster that appeared to be compiled with all …

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## [correct way of work with decomposed OpenFOAM case](https://discourse.paraview.org/t/correct-way-of-work-with-decomposed-openfoam-case/16108)

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**Author:** [@otaolafr](https://discourse.paraview.org/u/otaolafr)\
**Replies:** 13\
**Last updated:** [February 5, 2025, 1:20pm UTC](https://discourse.paraview.org/t/correct-way-of-work-with-decomposed-openfoam-case/16108 "2025-02-05T13:20:11Z")

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Hello, I wanted to get a feedback on the correct way of post process OpenFOAM cases using paraview. For better understanding, I will use case and simulation files indistinctively. for background: I have a simulation…

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## [How to preserve object properties across sessions when loading multiple savestates](https://discourse.paraview.org/t/how-to-preserve-object-properties-across-sessions-when-loading-multiple-savestates/16087)

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**Author:** [@Vinicius](https://discourse.paraview.org/u/Vinicius)\
**Replies:** 1\
**Last updated:** [February 5, 2025, 8:47am UTC](https://discourse.paraview.org/t/how-to-preserve-object-properties-across-sessions-when-loading-multiple-savestates/16087 "2025-02-05T08:47:15Z")

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Hi all, Is there a way to save the properties of an object (display settings, colorbar used, etc)? I am aware that you can use savestates. I need to load some objects from time to time in new sessions (with different fi…

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## [Calculator/slice error](https://discourse.paraview.org/t/calculator-slice-error/16104)

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**Author:** [@johnxia](https://discourse.paraview.org/u/johnxia)\
**Replies:** 1\
**Last updated:** [February 5, 2025, 8:12am UTC](https://discourse.paraview.org/t/calculator-slice-error/16104 "2025-02-05T08:12:38Z")

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A variable created using the calculator filter does not show up in the slice filter so it cannot be plotted. Paraview 5.12 on Mac Apple M2 Pro. Is there a workaround?

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## [pvserver nvidia docker - connection issue](https://discourse.paraview.org/t/pvserver-nvidia-docker-connection-issue/16007)

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**Author:** [@Nicholas\_Yue](https://discourse.paraview.org/u/Nicholas_Yue)\
**Replies:** 23\
**Last updated:** [February 1, 2025, 5:01pm UTC](https://discourse.paraview.org/t/pvserver-nvidia-docker-connection-issue/16007 "2025-02-01T17:01:13Z")

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I am trying to troubleshoot the following error and appreciate suggestion on where to start I have ensure the OS on both client/server end are the same (Ubuntu 22.04) I have ensure that both paraview and pvserver are f…

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## [How to increase the reading speed of Paraview with large data sets from OpenFoam](https://discourse.paraview.org/t/how-to-increase-the-reading-speed-of-paraview-with-large-data-sets-from-openfoam/16024)

<div class="topic-metadata">

**Author:** [@BrayanGM](https://discourse.paraview.org/u/BrayanGM)\
**Replies:** 10\
**Last updated:** [January 31, 2025, 8:44pm UTC](https://discourse.paraview.org/t/how-to-increase-the-reading-speed-of-paraview-with-large-data-sets-from-openfoam/16024 "2025-01-31T20:44:11Z")

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Hello, I am working with LES simulations that generate large data files. I am working on a cluster with OpenFoam and Paraview 5.13.1, running natively on the cluster. Paraview runs in parallel and also uses a GPU. The p…

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## [Openfoam multibody moving mesh (overset) - paraview doesn't show the computed movement](https://discourse.paraview.org/t/openfoam-multibody-moving-mesh-overset-paraview-doesnt-show-the-computed-movement/16089)

<div class="topic-metadata">

**Author:** [@Emanuele\_Ponzano](https://discourse.paraview.org/u/Emanuele_Ponzano)\
**Replies:** 1\
**Last updated:** [January 31, 2025, 10:15am UTC](https://discourse.paraview.org/t/openfoam-multibody-moving-mesh-overset-paraview-doesnt-show-the-computed-movement/16089 "2025-01-31T10:15:59Z")

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Hi, can you help me please with this issue: I’m doing a simulation in openfoam with moving mesh (overset type) with two bodies (a submarine and its propeller). The problem is that openfoam calculates the rotation of th…

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## [How to subtract overlapping STL surfaces in ParaView?](https://discourse.paraview.org/t/how-to-subtract-overlapping-stl-surfaces-in-paraview/16086)

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**Author:** [@vbryansm](https://discourse.paraview.org/u/vbryansm)\
**Replies:** 2\
**Last updated:** [January 31, 2025, 3:26am UTC](https://discourse.paraview.org/t/how-to-subtract-overlapping-stl-surfaces-in-paraview/16086 "2025-01-31T03:26:15Z")

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I have two STL surfaces (images below). I need to merge them while keeping only the bottom blue surface where they overlap - like removing material from the intersection area. How can I do this?

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## [Visualizing 3D Water Depth from a 2D River Channel Simulation](https://discourse.paraview.org/t/visualizing-3d-water-depth-from-a-2d-river-channel-simulation/16049)

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**Author:** [@nsh](https://discourse.paraview.org/u/nsh)\
**Replies:** 6\
**Last updated:** [January 30, 2025, 6:54am UTC](https://discourse.paraview.org/t/visualizing-3d-water-depth-from-a-2d-river-channel-simulation/16049 "2025-01-30T06:54:01Z")

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How can I use 2D data (x coordinate, y coordinate, z coordinate-bottom, water elevation z coordinate-top, x velocity, y velocity) to create a visualization for top water surface along with the side walls and bottom surfa…

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## [Sparse CSV - Delaunay3D filter Single to Multi threaded](https://discourse.paraview.org/t/sparse-csv-delaunay3d-filter-single-to-multi-threaded/16061)

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**Author:** [@ParticleTruthSeeker](https://discourse.paraview.org/u/ParticleTruthSeeker)\
**Replies:** 8\
**Last updated:** [January 30, 2025, 3:21am UTC](https://discourse.paraview.org/t/sparse-csv-delaunay3d-filter-single-to-multi-threaded/16061 "2025-01-30T03:21:09Z")

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I happen to be using this filter alot and it seems to be single threaded. Is there a way to recompile paraview and utilise multithreading for this? I am also in need to use this filter with a sparse csv which I would li…

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## [update all filters to new timestep automatically in python?](https://discourse.paraview.org/t/update-all-filters-to-new-timestep-automatically-in-python/16078)

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**Author:** [@otaolafr](https://discourse.paraview.org/u/otaolafr)\
**Replies:** 1\
**Last updated:** [January 29, 2025, 4:26pm UTC](https://discourse.paraview.org/t/update-all-filters-to-new-timestep-automatically-in-python/16078 "2025-01-29T16:26:01Z")

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hello, I am creating a script and a lot of times while ‘advancing’ the time steps in a loop and saving data that I extract at each time step of different filters using fetch and dsa. my issue/question is: how I update …

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## [How to keep the top of the text annotation the same when new lines are added?](https://discourse.paraview.org/t/how-to-keep-the-top-of-the-text-annotation-the-same-when-new-lines-are-added/16072)

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**Author:** [@Christopher](https://discourse.paraview.org/u/Christopher)\
**Replies:** 5\
**Last updated:** [January 29, 2025, 2:15pm UTC](https://discourse.paraview.org/t/how-to-keep-the-top-of-the-text-annotation-the-same-when-new-lines-are-added/16072 "2025-01-29T14:15:49Z")

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Hello guys. I have a question about text annotation in Paraview. When I add new lines to my text element (The first image), the top part of the text area moves upward and the bottom remains fixed in place (The second i…

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## [Object not centred when exporting a screenshot](https://discourse.paraview.org/t/object-not-centred-when-exporting-a-screenshot/16075)

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**Author:** [@aero.py](https://discourse.paraview.org/u/aero.py)\
**Replies:** 1\
**Last updated:** [January 29, 2025, 12:26pm UTC](https://discourse.paraview.org/t/object-not-centred-when-exporting-a-screenshot/16075 "2025-01-29T12:26:52Z")

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Hi, I wrote a python script to generate a set of frames of my views in paraview at different camera positions. I’m moving the camera position with renderView.CameraPosition=\[x,y,z\] and the camera seems to be following my…

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## [How to compute turbulent kinetic energy](https://discourse.paraview.org/t/how-to-compute-turbulent-kinetic-energy/16076)

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**Author:** [@Erika](https://discourse.paraview.org/u/Erika)\
**Replies:** 0\
**Last updated:** [January 29, 2025, 8:59am UTC](https://discourse.paraview.org/t/how-to-compute-turbulent-kinetic-energy/16076 "2025-01-29T08:59:43Z")

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Hi, I am quite a new user of Paraview, and I am dealing with the post-process of a CFD simulation. Specifically, I have the 3D velocity and pressure fields of a turbulent simulation, and I would like to find the behavio…

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## [Macro to extract all leaf nodes of a multiblock dataset](https://discourse.paraview.org/t/macro-to-extract-all-leaf-nodes-of-a-multiblock-dataset/15443)

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**Author:** [@boonth](https://discourse.paraview.org/u/boonth)\
**Replies:** 2\
**Last updated:** [January 28, 2025, 10:15pm UTC](https://discourse.paraview.org/t/macro-to-extract-all-leaf-nodes-of-a-multiblock-dataset/15443 "2025-01-28T22:15:06Z")

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Hi, I would like to write a macro in which given an arbitrary multiblock dataset, apply Extract Blocks to every leaf block in that dataset. @cory.quammen @spyridon97

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## [Rendering truss structures using Tubes, with variable thickness](https://discourse.paraview.org/t/rendering-truss-structures-using-tubes-with-variable-thickness/16051)

<div class="topic-metadata">

**Author:** [@hendrik](https://discourse.paraview.org/u/hendrik)\
**Replies:** 2\
**Last updated:** [January 28, 2025, 10:31am UTC](https://discourse.paraview.org/t/rendering-truss-structures-using-tubes-with-variable-thickness/16051 "2025-01-28T10:31:30Z")

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I want to render a structure of trusses using the Tubes filter. Importantly, each truss has a different (scalar) thickness. My problem is that I cannot select a scalar property for the “Vary Radius” option. (The scalar d…

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## [Unable to launch paraview: Could not load the Qt platform plugin](https://discourse.paraview.org/t/unable-to-launch-paraview-could-not-load-the-qt-platform-plugin/7339)

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**Author:** [@Bo\_Zeng](https://discourse.paraview.org/u/Bo_Zeng)\
**Replies:** 10\
**Last updated:** [January 28, 2025, 2:05am UTC](https://discourse.paraview.org/t/unable-to-launch-paraview-could-not-load-the-qt-platform-plugin/7339 "2025-01-28T02:05:00Z")

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Hi, I am trying to install ParaView-5.9.1-MPI-Linux-Python3.8-64bit on Ubuntu 20.04 LTS on a Windows10 machine. When I enter ./paraview in the bin directory, it returns: qt.qpa.xcb: could not connect to display qt.qpa.…

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## [Paraview crashes for xdmf file with anisotropic mesh](https://discourse.paraview.org/t/paraview-crashes-for-xdmf-file-with-anisotropic-mesh/16041)

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**Author:** [@peete1](https://discourse.paraview.org/u/peete1)\
**Replies:** 2\
**Last updated:** [January 27, 2025, 5:29pm UTC](https://discourse.paraview.org/t/paraview-crashes-for-xdmf-file-with-anisotropic-mesh/16041 "2025-01-27T17:29:43Z")

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Good day, I am working on a Linux machine, trying to visualize a parameter/time-dependent function from an xdmf file. (The file is generated from the open-source FEM software FenicsX). The function is defined on a 3-di…

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## [Crashing while saving animation](https://discourse.paraview.org/t/crashing-while-saving-animation/16060)

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**Author:** [@Giulian](https://discourse.paraview.org/u/Giulian)\
**Replies:** 2\
**Last updated:** [January 27, 2025, 4:23pm UTC](https://discourse.paraview.org/t/crashing-while-saving-animation/16060 "2025-01-27T16:23:28Z")

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Dear All, I keep having the same problem. Paraview crushes every time I try to save an animation. Could you please help me out with this? Best

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## [Threshold exactly one cell](https://discourse.paraview.org/t/threshold-exactly-one-cell/16047)

<div class="topic-metadata">

**Author:** [@edition999](https://discourse.paraview.org/u/edition999)\
**Replies:** 1\
**Last updated:** [January 24, 2025, 7:19pm UTC](https://discourse.paraview.org/t/threshold-exactly-one-cell/16047 "2025-01-24T19:19:38Z")

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Hello, I would like to threshold exactly one element of a mesh based on a cell data attribute (the element having maximum or minimum value). Is there a way to do that?

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## [Animating on two different 'levels'](https://discourse.paraview.org/t/animating-on-two-different-levels/16039)

<div class="topic-metadata">

**Author:** [@JoranZwet](https://discourse.paraview.org/u/JoranZwet)\
**Replies:** 1\
**Last updated:** [January 24, 2025, 12:55pm UTC](https://discourse.paraview.org/t/animating-on-two-different-levels/16039 "2025-01-24T12:55:26Z")

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Hi there, I work in topology optimization and our results usually consists of the design and various relevant fields (think: temperature, displacement, forces, stresses) in vti files for all optimization iterations. We …

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## [Annotate block name in RenderView](https://discourse.paraview.org/t/annotate-block-name-in-renderview/15626)

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**Author:** [@fra](https://discourse.paraview.org/u/fra)\
**Replies:** 6\
**Last updated:** [January 24, 2025, 7:20am UTC](https://discourse.paraview.org/t/annotate-block-name-in-renderview/15626 "2025-01-24T07:20:11Z")

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Hi, I have the following use case: I have an OpenFOAM case, which I am reading through the native Paraview reader that treats it as a multiblock dataset. Is there a way to show in the RenderView some kind of ‘tooltip’ t…

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## [ERROR: qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in ""](https://discourse.paraview.org/t/error-qt-qpa-plugin-could-not-find-the-qt-platform-plugin-xcb-in/16032)

<div class="topic-metadata">

**Author:** [@tictes](https://discourse.paraview.org/u/tictes)\
**Replies:** 5\
**Last updated:** [January 23, 2025, 3:23pm UTC](https://discourse.paraview.org/t/error-qt-qpa-plugin-could-not-find-the-qt-platform-plugin-xcb-in/16032 "2025-01-23T15:23:33Z")

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Hello, I tried running Paraview, but got the error message: qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in "" This application failed to start because no Qt platform plugin could be initialized. Reinstal…

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