# ParaView Support

**URL:** https://discourse.paraview.org/c/paraview-support/7.md?page=145

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

**Page:** 146

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## [vtkMultiBlockMergeFilter usage](https://discourse.paraview.org/t/vtkmultiblockmergefilter-usage/7017)

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**Author:** [@bmxam](https://discourse.paraview.org/u/bmxam)\
**Replies:** 4\
**Last updated:** [April 21, 2021, 1:07pm UTC](https://discourse.paraview.org/t/vtkmultiblockmergefilter-usage/7017 "2021-04-21T13:07:21Z")

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Hi everyone, I’m brand new in the world of Programmable Filter. In my python script, I’m trying to merge the blocks of a Multi-block Dataset (and then some additionnal steps that are already working). With the GUI, I si…

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## [Cell data vs. point data for high-order Lagrange cells](https://discourse.paraview.org/t/cell-data-vs-point-data-for-high-order-lagrange-cells/7015)

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**Author:** [@sloede](https://discourse.paraview.org/u/sloede)\
**Replies:** 4\
**Last updated:** [April 21, 2021, 12:42pm UTC](https://discourse.paraview.org/t/cell-data-vs-point-data-for-high-order-lagrange-cells/7015 "2021-04-21T12:42:23Z")

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Hi everyone, We are trying to use the fairly recent VTK Lagrange cells (specifically, quadrilaterals and hexahedrals). However, some things are not clear to me and I couldn’t find any documentation on it: Is it possib…

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## [Nodes id on a 2D mesh](https://discourse.paraview.org/t/nodes-id-on-a-2d-mesh/7002)

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**Author:** [@Hrishikesh\_Das](https://discourse.paraview.org/u/Hrishikesh_Das)\
**Replies:** 1\
**Last updated:** [April 21, 2021, 3:27am UTC](https://discourse.paraview.org/t/nodes-id-on-a-2d-mesh/7002 "2021-04-21T03:27:04Z")

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Hello friends this is my first post. I am trying to view the nodes and elements numbers of a 2d mesh. Earlier I was successful in doing that. see picture below, but now when I am trying to do it I am unable to do so, May…

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## [How can I calculate the distance between two 3D cloud points and how to view coincidence points between two surfaces.](https://discourse.paraview.org/t/how-can-i-calculate-the-distance-between-two-3d-cloud-points-and-how-to-view-coincidence-points-between-two-surfaces/7007)

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**Author:** [@Pppp](https://discourse.paraview.org/u/Pppp)\
**Replies:** 0\
**Last updated:** [April 20, 2021, 1:08pm UTC](https://discourse.paraview.org/t/how-can-i-calculate-the-distance-between-two-3d-cloud-points-and-how-to-view-coincidence-points-between-two-surfaces/7007 "2021-04-20T13:08:24Z")

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How can I calculate the distance between two 3D cloud points and how to view coincidence points between two surfaces.

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## [How to create the surface of a point cloud object?](https://discourse.paraview.org/t/how-to-create-the-surface-of-a-point-cloud-object/1051)

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**Author:** [@Dinushika1992](https://discourse.paraview.org/u/Dinushika1992)\
**Replies:** 5\
**Last updated:** [April 20, 2021, 12:43pm UTC](https://discourse.paraview.org/t/how-to-create-the-surface-of-a-point-cloud-object/1051 "2021-04-20T12:43:11Z")

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Hi, I have a point cloud object. I need to save it as a .stl file. But since there is no any surface of the object (there is only point data) I can not create a .stl file. Could you please help me to solve my problem?

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## [Visualize the difference between two mesh points](https://discourse.paraview.org/t/visualize-the-difference-between-two-mesh-points/6748)

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**Author:** [@chathu](https://discourse.paraview.org/u/chathu)\
**Replies:** 1\
**Last updated:** [March 20, 2021, 11:59am UTC](https://discourse.paraview.org/t/visualize-the-difference-between-two-mesh-points/6748 "2021-03-20T11:59:11Z")

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I have two volumetric liver meshes in .vtk format (i.e. ground-truth and predicted versions) and now I want to plot the error i.e., for example, the difference between the ground-truth and the predicted liver meshes on t…

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## [Cannot use SpreadSheet View](https://discourse.paraview.org/t/cannot-use-spreadsheet-view/7005)

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**Author:** [@HuaCornealStudy](https://discourse.paraview.org/u/HuaCornealStudy)\
**Replies:** 1\
**Last updated:** [April 20, 2021, 4:39am UTC](https://discourse.paraview.org/t/cannot-use-spreadsheet-view/7005 "2021-04-20T04:39:14Z")

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Hello all, when I clicked “spreadsheet view”, the software automatically turned off. The file is 36MB. Please can you help on this issue? Is my computer not powerful enough to run the software? Thank you.

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## [Paraview Color Map Editor colors only pink. Not matching display area](https://discourse.paraview.org/t/paraview-color-map-editor-colors-only-pink-not-matching-display-area/6985)

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**Author:** [@MarkY](https://discourse.paraview.org/u/MarkY)\
**Replies:** 5\
**Last updated:** [April 20, 2021, 4:31am UTC](https://discourse.paraview.org/t/paraview-color-map-editor-colors-only-pink-not-matching-display-area/6985 "2021-04-20T04:31:57Z")

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Hello. My color map editor is showing up as shades of pink but the colors in the display window are correct. There are blotches of color on top of the color map editor as well. See the blue smearing in the picture. T…

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## [Block Model View](https://discourse.paraview.org/t/block-model-view/6965)

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**Author:** [@Rodrigo\_Rocha](https://discourse.paraview.org/u/Rodrigo_Rocha)\
**Replies:** 2\
**Last updated:** [April 19, 2021, 7:14pm UTC](https://discourse.paraview.org/t/block-model-view/6965 "2021-04-19T19:14:08Z")

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Hey! I imported a block model directly from Datamine (with the plug-in active) and I want to see this model in the form of blocks, not as points. Does anyone know how to do?

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## [While launching paraview we are seeing warnings and error message](https://discourse.paraview.org/t/while-launching-paraview-we-are-seeing-warnings-and-error-message/6980)

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**Author:** [@skumar469](https://discourse.paraview.org/u/skumar469)\
**Replies:** 5\
**Last updated:** [April 19, 2021, 5:45pm UTC](https://discourse.paraview.org/t/while-launching-paraview-we-are-seeing-warnings-and-error-message/6980 "2021-04-19T17:45:14Z")

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\[dobly@insdsd bin\]$ /opt/VirtualGL/bin/vglrun ./paraview ( 0.909s) \[paraview \]vtkOpenGLRenderWindow.c:578 ERR| vtkXOpenGLRenderWindow (0x54fb880): Unable to find a valid OpenGL 3.2 or later implementation. …

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## [Contour filter for high-order elements](https://discourse.paraview.org/t/contour-filter-for-high-order-elements/7001)

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**Author:** [@nvmr](https://discourse.paraview.org/u/nvmr)\
**Replies:** 0\
**Last updated:** [April 19, 2021, 4:22pm UTC](https://discourse.paraview.org/t/contour-filter-for-high-order-elements/7001 "2021-04-19T16:22:49Z")

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Dear ParaView-Support, I try to implement the vtkLagrange\*Cells into a high-order DG code in order to visualize the solution without requiring an extra internal interpolation procedure. After some problems in the begin…

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## [Run Vizualiser from ParaView](https://discourse.paraview.org/t/run-vizualiser-from-paraview/6947)

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**Author:** [@vicst](https://discourse.paraview.org/u/vicst)\
**Replies:** 9\
**Last updated:** [April 19, 2021, 2:59pm UTC](https://discourse.paraview.org/t/run-vizualiser-from-paraview/6947 "2021-04-19T14:59:49Z")

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Hi! I want to run Visualizer from ParaView in the terminal (I use Mac). I follow this step by step: https://kitware.github.io/visualizer/docs/index.html ./bin/pvpython ./Resourc…

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## [Fail to build ParaView for ARM arch.](https://discourse.paraview.org/t/fail-to-build-paraview-for-arm-arch/6928)

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**Author:** [@Andythe\_great](https://discourse.paraview.org/u/Andythe_great)\
**Replies:** 2\
**Last updated:** [April 19, 2021, 2:53pm UTC](https://discourse.paraview.org/t/fail-to-build-paraview-for-arm-arch/6928 "2021-04-19T14:53:31Z")

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Hello, I just create Flatpak package for ParaView 5.9.0. But it fail to build for ARM arch. I don’t have ARM CPU myself, I can only use Github action to build it. The full log can be download here: Flathub builds I…

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## [PVD file for geometry that is not changing](https://discourse.paraview.org/t/pvd-file-for-geometry-that-is-not-changing/6915)

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**Author:** [@samuelco](https://discourse.paraview.org/u/samuelco)\
**Replies:** 2\
**Last updated:** [April 19, 2021, 10:29am UTC](https://discourse.paraview.org/t/pvd-file-for-geometry-that-is-not-changing/6915 "2021-04-19T10:29:44Z")

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I am visualizing a fluid domain, so the grid that I am using is fixed in time. Storing the geometry in each .vtu file takes up a lot of storage, so I was wondering if there is a way to store the geometry only once and on…

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## [Combining Python State Files and comparisons with SaveAnimation](https://discourse.paraview.org/t/combining-python-state-files-and-comparisons-with-saveanimation/6967)

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**Author:** [@Mike\_Tree](https://discourse.paraview.org/u/Mike_Tree)\
**Replies:** 3\
**Last updated:** [April 19, 2021, 9:41am UTC](https://discourse.paraview.org/t/combining-python-state-files-and-comparisons-with-saveanimation/6967 "2021-04-19T09:41:49Z")

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I have a workflow where users create ParaView python state files of different images they may want from a data set. The workflow combines the state files, consolidating as many of the filters as possible, but at least co…

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## [volume rendering for unstructured grid returns error, how to solve that?](https://discourse.paraview.org/t/volume-rendering-for-unstructured-grid-returns-error-how-to-solve-that/6993)

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**Author:** [@IrinaZhuang](https://discourse.paraview.org/u/IrinaZhuang)\
**Replies:** 8\
**Last updated:** [April 19, 2021, 9:07am UTC](https://discourse.paraview.org/t/volume-rendering-for-unstructured-grid-returns-error-how-to-solve-that/6993 "2021-04-19T09:07:57Z")

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Hi, I created a vtu file, which originally was csv-like file, its format: x y z + point data. However, when trying to do volume rendering, I encountered error: vtkOpenGLProjectedTetrahedraMapper (000002413E153CE0): Enco…

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## [Paraview update on Ubuntu: Issues](https://discourse.paraview.org/t/paraview-update-on-ubuntu-issues/5373)

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**Author:** [@arun\_v1986](https://discourse.paraview.org/u/arun_v1986)\
**Replies:** 15\
**Last updated:** [April 19, 2021, 8:08am UTC](https://discourse.paraview.org/t/paraview-update-on-ubuntu-issues/5373 "2021-04-19T08:08:55Z")

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I have installed OpenFoam 8 on my system (ubuntu 20.04) which has Paraview 5.6 bundled with it. I have then downloaded the Paraview 5.8.1 .tar file and unpacked it. I am able to launch version 5.8.1 from the folder where…

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## [Filter animation using Keyframes](https://discourse.paraview.org/t/filter-animation-using-keyframes/6922)

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**Author:** [@Captain\_Convergence](https://discourse.paraview.org/u/Captain_Convergence)\
**Replies:** 2\
**Last updated:** [April 17, 2021, 11:29am UTC](https://discourse.paraview.org/t/filter-animation-using-keyframes/6922 "2021-04-17T11:29:00Z")

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Dear all, I am trying to render an animation in a HPC and for this reason I need to do everything by python scripts. I am able to generate a camera movement using Keyframes with a code that looks like this: Step 1 ) Ge…

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## [Extracting surface values and shear stress vectors from volume](https://discourse.paraview.org/t/extracting-surface-values-and-shear-stress-vectors-from-volume/6986)

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**Author:** [@Mark\_Lohry](https://discourse.paraview.org/u/Mark_Lohry)\
**Replies:** 0\
**Last updated:** [April 17, 2021, 12:27am UTC](https://discourse.paraview.org/t/extracting-surface-values-and-shear-stress-vectors-from-volume/6986 "2021-04-17T00:27:09Z")

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I have a volumetric flow field consisting of vertex-centered CGNS data, but no specific surface solution data. How does one go about extracting the boundary surfaces with their accompanying values? How can I compute su…

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## [Export stl from a powder pack obtained in LIGGGHTS](https://discourse.paraview.org/t/export-stl-from-a-powder-pack-obtained-in-liggghts/6604)

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**Author:** [@smmha](https://discourse.paraview.org/u/smmha)\
**Replies:** 8\
**Last updated:** [April 16, 2021, 6:49pm UTC](https://discourse.paraview.org/t/export-stl-from-a-powder-pack-obtained-in-liggghts/6604 "2021-04-16T18:49:58Z")

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Hi I have imported a powder pack in PV. When I use the point gaussian representation with the desired particle radius, it seems ok. However, I cannot export this geometry to import it in fluent. Is it possible to export…

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## [Tool for measuring angles between lines or vectors](https://discourse.paraview.org/t/tool-for-measuring-angles-between-lines-or-vectors/6973)

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**Author:** [@Petr\_Melnikov](https://discourse.paraview.org/u/Petr_Melnikov)\
**Replies:** 1\
**Last updated:** [April 16, 2021, 4:52pm UTC](https://discourse.paraview.org/t/tool-for-measuring-angles-between-lines-or-vectors/6973 "2021-04-16T16:52:59Z")

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Hi Guys, Is there a Ruler-like tool in Paraview for measuring angles between lines or vectors? Best regards, Petr

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## [Using NRRD lable maps to isolate internal vtk data](https://discourse.paraview.org/t/using-nrrd-lable-maps-to-isolate-internal-vtk-data/6969)

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**Author:** [@Douglas\_Todd](https://discourse.paraview.org/u/Douglas_Todd)\
**Replies:** 7\
**Last updated:** [April 16, 2021, 4:18pm UTC](https://discourse.paraview.org/t/using-nrrd-lable-maps-to-isolate-internal-vtk-data/6969 "2021-04-16T16:18:44Z")

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Good Afternoon. I am new to Paraview, and am looking for a suggestion on how to extract 3d data using an nrrd label map. I have created an NRRD label map file that contains labels for the internal structures of an obje…

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## [vtu or vtk file formats - which is preferred?](https://discourse.paraview.org/t/vtu-or-vtk-file-formats-which-is-preferred/6976)

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**Author:** [@dculp](https://discourse.paraview.org/u/dculp)\
**Replies:** 1\
**Last updated:** [April 16, 2021, 1:34pm UTC](https://discourse.paraview.org/t/vtu-or-vtk-file-formats-which-is-preferred/6976 "2021-04-16T13:34:38Z")

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I’m using ccx2paraview v2.3.1 to convert calculix results (static and modal). ccx2paraview can produce both vtu and vtk files. Which of these is preferred by Paraview? Why? Thanks, Don C.

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## [how to transform 2d Axisymmetric solution(.pvd or .vtu) plane to 3d cylinder](https://discourse.paraview.org/t/how-to-transform-2d-axisymmetric-solution-pvd-or-vtu-plane-to-3d-cylinder/6962)

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**Author:** [@Ganga\_B](https://discourse.paraview.org/u/Ganga_B)\
**Replies:** 0\
**Last updated:** [April 15, 2021, 2:13pm UTC](https://discourse.paraview.org/t/how-to-transform-2d-axisymmetric-solution-pvd-or-vtu-plane-to-3d-cylinder/6962 "2021-04-15T14:13:02Z")

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I am new to paraview , I want the project the 2d axial symmetric solution plane to the cylinder by rotation of angle 270degree. Can anyone please suggest the procedure.

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## [About "gradient of unstructured data set" filter](https://discourse.paraview.org/t/about-gradient-of-unstructured-data-set-filter/6935)

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**Author:** [@jeff](https://discourse.paraview.org/u/jeff)\
**Replies:** 2\
**Last updated:** [April 15, 2021, 11:36am UTC](https://discourse.paraview.org/t/about-gradient-of-unstructured-data-set-filter/6935 "2021-04-15T11:36:22Z")

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I just started learning CFD My problem is that the function of calculating vorticity in the filter is in the source code. I don’t understand the mathematical equation it represents. Does anyone know how to write this s…

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## [GUI in ParaView](https://discourse.paraview.org/t/gui-in-paraview/6949)

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**Author:** [@Robiiin](https://discourse.paraview.org/u/Robiiin)\
**Replies:** 2\
**Last updated:** [April 15, 2021, 7:55am UTC](https://discourse.paraview.org/t/gui-in-paraview/6949 "2021-04-15T07:55:19Z")

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Hello, I want to add my own interactive buttons and bars/slider in ParaView. I read about ParaView plugins that should allow this but can not find any good documentation or tutorials on how to do this.

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## [Paraview installation error with TTK](https://discourse.paraview.org/t/paraview-installation-error-with-ttk/6957)

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**Author:** [@shan23](https://discourse.paraview.org/u/shan23)\
**Replies:** 2\
**Last updated:** [April 15, 2021, 2:37am UTC](https://discourse.paraview.org/t/paraview-installation-error-with-ttk/6957 "2021-04-15T02:37:20Z")

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Hi, I followed the steps in https://topology-tool-kit.github.io/installation-osx.html to install paraview on Mac OS X Catalina. However, after installation, I’m running into the following issue whle trying to launch pa…

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## [Is it possible to automatically graph data from a qt plugin?](https://discourse.paraview.org/t/is-it-possible-to-automatically-graph-data-from-a-qt-plugin/6791)

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**Author:** [@anthomas](https://discourse.paraview.org/u/anthomas)\
**Replies:** 5\
**Last updated:** [April 14, 2021, 9:35pm UTC](https://discourse.paraview.org/t/is-it-possible-to-automatically-graph-data-from-a-qt-plugin/6791 "2021-04-14T21:35:16Z")

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I am trying to graph data that is being generated in real time with a paraview (5.8) plugin, the plugin is a gui to start generating this data. Is it possible to implement an outside filter within the plugin to plot to t…

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## [server on multiple nodes -\> which node has the 0-thread to connect to?](https://discourse.paraview.org/t/server-on-multiple-nodes-which-node-has-the-0-thread-to-connect-to/6950)

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**Author:** [@lukasWiel](https://discourse.paraview.org/u/lukasWiel)\
**Replies:** 0\
**Last updated:** [April 14, 2021, 10:31am UTC](https://discourse.paraview.org/t/server-on-multiple-nodes-which-node-has-the-0-thread-to-connect-to/6950 "2021-04-14T10:31:37Z")

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When a large server is running on multiple compute nodes of a cluster, and the client has to connect to the 0-thread, according to the wiki, how does the server inform on which of the nodes that were assigned to it the …

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## [Light Inspector & Light Kit Documentation?](https://discourse.paraview.org/t/light-inspector-light-kit-documentation/6941)

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**Author:** [@ReneHommel](https://discourse.paraview.org/u/ReneHommel)\
**Replies:** 2\
**Last updated:** [April 14, 2021, 8:00am UTC](https://discourse.paraview.org/t/light-inspector-light-kit-documentation/6941 "2021-04-14T08:00:42Z")

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I have searched a lot in the documentation, in the Paraview Wiki and in other sources, but I can’t find any documentation of the Light Inspector Panel. Especially the Light Kit is not very intuitive. The additional ligh…

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