# ParaView Support

**URL:** https://discourse.paraview.org/c/paraview-support/7.md?page=151

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

**Page:** 152

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## [Nonlinear subdivision for rational Bézier curves not working](https://discourse.paraview.org/t/nonlinear-subdivision-for-rational-bezier-curves-not-working/6522)

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**Author:** [@JHarsch](https://discourse.paraview.org/u/JHarsch)\
**Replies:** 2\
**Last updated:** [March 1, 2021, 6:39am UTC](https://discourse.paraview.org/t/nonlinear-subdivision-for-rational-bezier-curves-not-working/6522 "2021-03-01T06:39:18Z")

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As written in the blog post vtk recently supports rational Bézier cells. The two and three dimensional cells are visualized as expected by ParaView but the curve elements seem to be broken. Beziér curve with nonlinear…

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## [Build paraview inside Windows Subsystem for Linux(WSL)](https://discourse.paraview.org/t/build-paraview-inside-windows-subsystem-for-linux-wsl/6439)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 15\
**Last updated:** [February 28, 2021, 1:11pm UTC](https://discourse.paraview.org/t/build-paraview-inside-windows-subsystem-for-linux-wsl/6439 "2021-02-28T13:11:24Z")

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Hi, is there anybody tried to build paraview inside WSL? I only have windows system, but i have to provide paraview client for other platforms, any suggestion?

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## ["JSON parsing error" when connect to a remote pvserver](https://discourse.paraview.org/t/json-parsing-error-when-connect-to-a-remote-pvserver/6504)

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**Author:** [@Yang](https://discourse.paraview.org/u/Yang)\
**Replies:** 2\
**Last updated:** [February 28, 2021, 12:25pm UTC](https://discourse.paraview.org/t/json-parsing-error-when-connect-to-a-remote-pvserver/6504 "2021-02-28T12:25:11Z")

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When I try to connect to a pvserver on my desktop, the paraview shows the following message: ERROR: In C:\\glr\\builds\\paraview\\paraview-ci\\build\\superbuild\\paraview\\src\\VTK\\Rendering\\RayTracing\\vtkOSPRayMaterialLibrary.…

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## [Downstream Filter add coloring array to upstream data](https://discourse.paraview.org/t/downstream-filter-add-coloring-array-to-upstream-data/6510)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 2\
**Last updated:** [February 28, 2021, 11:44am UTC](https://discourse.paraview.org/t/downstream-filter-add-coloring-array-to-upstream-data/6510 "2021-02-28T11:44:23Z")

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I know it is not recommended that change input data by filter, but due to some special reason (my GUI picker can only recognize and pick initial data, and cannot work for new copy from filter) I need add some new colorin…

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## [How can I map distances between joint areas in contact using ParaView 5.9.0 ?](https://discourse.paraview.org/t/how-can-i-map-distances-between-joint-areas-in-contact-using-paraview-5-9-0/6559)

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**Author:** [@Pppp](https://discourse.paraview.org/u/Pppp)\
**Replies:** 2\
**Last updated:** [February 26, 2021, 1:52pm UTC](https://discourse.paraview.org/t/how-can-i-map-distances-between-joint-areas-in-contact-using-paraview-5-9-0/6559 "2021-02-26T13:52:33Z")

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How can I map distances between joint areas in contact using ParaView 5.9.0 ?

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## [Paraview PTSReader misses the first point](https://discourse.paraview.org/t/paraview-ptsreader-misses-the-first-point/6495)

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**Author:** [@alex\_xu](https://discourse.paraview.org/u/alex_xu)\
**Replies:** 7\
**Last updated:** [February 25, 2021, 8:58pm UTC](https://discourse.paraview.org/t/paraview-ptsreader-misses-the-first-point/6495 "2021-02-25T20:58:11Z")

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I try to read .pts file in the Paraview. here is one point in the test.pts file. the content is as follows: 7.75 14.28 19.08 Based on the source code here There should be one point read in the Paraview. However,…

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## [how to combine and calculate the data from the same cell and point model?](https://discourse.paraview.org/t/how-to-combine-and-calculate-the-data-from-the-same-cell-and-point-model/6552)

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**Author:** [@aquanaut](https://discourse.paraview.org/u/aquanaut)\
**Replies:** 3\
**Last updated:** [February 25, 2021, 9:52am UTC](https://discourse.paraview.org/t/how-to-combine-and-calculate-the-data-from-the-same-cell-and-point-model/6552 "2021-02-25T09:52:02Z")

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hi,I want to calculate the square root of Vx Vy Vz but in three same model.How can I do that?

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## [Reason for Termination data not written to stream tracer CSV file](https://discourse.paraview.org/t/reason-for-termination-data-not-written-to-stream-tracer-csv-file/6551)

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**Author:** [@garage\_physicist](https://discourse.paraview.org/u/garage_physicist)\
**Replies:** 1\
**Last updated:** [February 25, 2021, 8:44am UTC](https://discourse.paraview.org/t/reason-for-termination-data-not-written-to-stream-tracer-csv-file/6551 "2021-02-25T08:44:14Z")

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When saving a stream tracer to a CSV file, there’s an option to select what data is written. Even though “Reason for termination” is selected, it doesn’t get written to the file. Does anyone know how to get around this i…

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## [Accessing vtkScalarBarActor from Paraview/Python](https://discourse.paraview.org/t/accessing-vtkscalarbaractor-from-paraview-python/6547)

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**Author:** [@liangwang0734](https://discourse.paraview.org/u/liangwang0734)\
**Replies:** 0\
**Last updated:** [February 24, 2021, 3:56pm UTC](https://discourse.paraview.org/t/accessing-vtkscalarbaractor-from-paraview-python/6547 "2021-02-24T15:56:47Z")

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My true motivation is to add a background color to the colorbar widget (when the rendered objects are messy and make the colorbar widget text/colors hard to see). The pyvista package seems to do it directly with vtkScala…

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## [Errors in Python in server side of vtk.js](https://discourse.paraview.org/t/errors-in-python-in-server-side-of-vtk-js/6549)

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**Author:** [@Luis\_Carlos\_Carneiro](https://discourse.paraview.org/u/Luis_Carlos_Carneiro)\
**Replies:** 1\
**Last updated:** [February 24, 2021, 5:07pm UTC](https://discourse.paraview.org/t/errors-in-python-in-server-side-of-vtk-js/6549 "2021-02-24T17:07:57Z")

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Dear All, Are there some way from server side python handler in Python to display runtime errors? Using pvpython. Command line below. “c:\\Program Files\\ParaView 5.9.0-RC2-Windows-Python3.8-msvc2017-64bit\\bin\\pvpython.…

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## [Feature Edges partially shown for hidden Edges](https://discourse.paraview.org/t/feature-edges-partially-shown-for-hidden-edges/6537)

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**Author:** [@theodorebaltis](https://discourse.paraview.org/u/theodorebaltis)\
**Replies:** 2\
**Last updated:** [February 24, 2021, 5:03pm UTC](https://discourse.paraview.org/t/feature-edges-partially-shown-for-hidden-edges/6537 "2021-02-24T17:03:40Z")

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I’ve found that when applying Feature Edges to a model there are often lines drawn along edges that are not visible: Enabling Camera Parallel Projection exacerbates this problem: I’ve tried adjusting the properties…

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## [Inconsistent rendering of point data in hexahedrall cells](https://discourse.paraview.org/t/inconsistent-rendering-of-point-data-in-hexahedrall-cells/6536)

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**Author:** [@bvlqz](https://discourse.paraview.org/u/bvlqz)\
**Replies:** 2\
**Last updated:** [February 24, 2021, 3:40pm UTC](https://discourse.paraview.org/t/inconsistent-rendering-of-point-data-in-hexahedrall-cells/6536 "2021-02-24T15:40:58Z")

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Hi, When I load a vtkUnstrucuredGrid and color by scalars, I was expecting the coloring to be symetrical, but it looks like there is an interpolation error: here’s my data: # vtk DataFile Version 4.2 vtk output AS…

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## [Missing blocks in animation when using parallel processing](https://discourse.paraview.org/t/missing-blocks-in-animation-when-using-parallel-processing/6482)

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**Author:** [@Captain\_Convergence](https://discourse.paraview.org/u/Captain_Convergence)\
**Replies:** 8\
**Last updated:** [February 24, 2021, 1:17pm UTC](https://discourse.paraview.org/t/missing-blocks-in-animation-when-using-parallel-processing/6482 "2021-02-24T13:17:46Z")

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Dear all, I am using a post process script executed in the HPC of my institution for generating the streaklines of my simulation carried out in a multiblock mesh. I am calling the pvbatch as : mpiexec -np 6 pvbatch -…

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## [Problem in PlotSelectionOverTime after integratevariables](https://discourse.paraview.org/t/problem-in-plotselectionovertime-after-integratevariables/6541)

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**Author:** [@proxy](https://discourse.paraview.org/u/proxy)\
**Replies:** 0\
**Last updated:** [February 24, 2021, 7:46am UTC](https://discourse.paraview.org/t/problem-in-plotselectionovertime-after-integratevariables/6541 "2021-02-24T07:46:01Z")

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Hello Experts, I have simulated a case file in OpenFoam, in this case I have a scalar called “alpha.water”. I want a plot of the integral of “alpha.water” against time. For achieving this, I selected the case file (supp…

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## [Compute the dual of a cartesian AMR grid](https://discourse.paraview.org/t/compute-the-dual-of-a-cartesian-amr-grid/6539)

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**Author:** [@woodscn](https://discourse.paraview.org/u/woodscn)\
**Replies:** 0\
**Last updated:** [February 24, 2021, 1:12am UTC](https://discourse.paraview.org/t/compute-the-dual-of-a-cartesian-amr-grid/6539 "2021-02-24T01:12:46Z")

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Is there a straightforward way to compute a dual grid based on a cartesian AMR dataset? I started to attempt this by using the Cell Centers filter and attempting a Delaunay3D triangulation, but that did not work. @patch…

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## [Determine and plot the superficial velocity ](https://discourse.paraview.org/t/determine-and-plot-the-superficial-velocity/6441)

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**Author:** [@Sumit\_Zanje](https://discourse.paraview.org/u/Sumit_Zanje)\
**Replies:** 4\
**Last updated:** [February 22, 2021, 10:22pm UTC](https://discourse.paraview.org/t/determine-and-plot-the-superficial-velocity/6441 "2021-02-22T22:22:20Z")

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Hi, I’m performing pressure driven flow in the horizontal pipe using OpenFOAM. As the case is pressure driven flow, it gives specific velocity of liquid based on pressure difference between upstream and downstream end o…

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## [ParaView 5.9.0 on MacOS saves broken screenshot and animation](https://discourse.paraview.org/t/paraview-5-9-0-on-macos-saves-broken-screenshot-and-animation/6518)

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**Author:** [@MBG](https://discourse.paraview.org/u/MBG)\
**Replies:** 2\
**Last updated:** [February 22, 2021, 3:58pm UTC](https://discourse.paraview.org/t/paraview-5-9-0-on-macos-saves-broken-screenshot-and-animation/6518 "2021-02-22T15:58:12Z")

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See the original ParaView window view: And the same view saved on ParaView screenshot: Here white border added around title text and font sizes are much smaller.

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## [How can I refine the model in unstructure grid?](https://discourse.paraview.org/t/how-can-i-refine-the-model-in-unstructure-grid/6525)

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**Author:** [@Jie\_Wu](https://discourse.paraview.org/u/Jie_Wu)\
**Replies:** 0\
**Last updated:** [February 22, 2021, 3:49pm UTC](https://discourse.paraview.org/t/how-can-i-refine-the-model-in-unstructure-grid/6525 "2021-02-22T15:49:47Z")

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Hi Paraview community members, Here is a picture of the model I imported through an unstructured grid file shared in this dropbox link. As you can see that, the model looks very rough due to not enough particles. I …

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## [ParaView 5.9 can't load python 3.8 libraries on MacOS Catalina](https://discourse.paraview.org/t/paraview-5-9-cant-load-python-3-8-libraries-on-macos-catalina/6164)

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**Author:** [@MBG](https://discourse.paraview.org/u/MBG)\
**Replies:** 16\
**Last updated:** [February 20, 2021, 6:11pm UTC](https://discourse.paraview.org/t/paraview-5-9-cant-load-python-3-8-libraries-on-macos-catalina/6164 "2021-02-20T18:11:24Z")

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That’s possible to load the library from Python in Terminal and I added the key “com.apple.security.cs.disable-library-validation” to the plist but without success: import geopandas as gpd File "/usr/local/lib/pyt…

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## [plot tangent to a contour](https://discourse.paraview.org/t/plot-tangent-to-a-contour/6514)

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**Author:** [@sthavishtha](https://discourse.paraview.org/u/sthavishtha)\
**Replies:** 0\
**Last updated:** [February 20, 2021, 4:13pm UTC](https://discourse.paraview.org/t/plot-tangent-to-a-contour/6514 "2021-02-20T16:13:13Z")

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Hello everyone In Paraview 5.8.0, I plot 1 contour line (an arc) of the density field (thick black colored line) on top of the density isocolor field (blue to red color variation). See below : Can someone suggest me …

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## [ParaView 5.9 OptiX Error](https://discourse.paraview.org/t/paraview-5-9-optix-error/6511)

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**Author:** [@Argyris\_Apostolidis](https://discourse.paraview.org/u/Argyris_Apostolidis)\
**Replies:** 0\
**Last updated:** [February 20, 2021, 9:58am UTC](https://discourse.paraview.org/t/paraview-5-9-optix-error/6511 "2021-02-20T09:58:57Z")

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Hello, I just downloaded ParaView-5.9.0-MPI-Linux-Python3.8-64bit, when I try to enable ray-tracing with OptiX I get the following error: VisRTX 0.1.6, using devices: 0: Quadro M620 (Total: 2.1 GB, Available: 2.1 GB) …

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## [Interpolate data onto line/sphere/etc. source](https://discourse.paraview.org/t/interpolate-data-onto-line-sphere-etc-source/6506)

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**Author:** [@Argyris\_Apostolidis](https://discourse.paraview.org/u/Argyris_Apostolidis)\
**Replies:** 2\
**Last updated:** [February 19, 2021, 12:04pm UTC](https://discourse.paraview.org/t/interpolate-data-onto-line-sphere-etc-source/6506 "2021-02-19T12:04:09Z")

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Hello, I want to interpolate my scalar field into a polyline source or sphere source etc., in order to colour it (the source) afterwards with this scalar field. Is this possible? Are there any alternatives? Thank you i…

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## [extract volume](https://discourse.paraview.org/t/extract-volume/6497)

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**Author:** [@ValeRomano](https://discourse.paraview.org/u/ValeRomano)\
**Replies:** 3\
**Last updated:** [February 18, 2021, 6:34pm UTC](https://discourse.paraview.org/t/extract-volume/6497 "2021-02-18T18:34:36Z")

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Hello, I need to extract a subset volume from my domain in order to make same calculation on the data. How can I do this? I need this subset at each time step. Attached a figure showing the domain, I need to extract th…

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## [DSMC - Mass flow rate thorugh cylinder](https://discourse.paraview.org/t/dsmc-mass-flow-rate-thorugh-cylinder/6489)

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**Author:** [@Owen99](https://discourse.paraview.org/u/Owen99)\
**Replies:** 4\
**Last updated:** [February 18, 2021, 5:05pm UTC](https://discourse.paraview.org/t/dsmc-mass-flow-rate-thorugh-cylinder/6489 "2021-02-18T17:05:05Z")

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Hello, Apologies if this has already been asked but I couldn’t find it anywhere of the internet. I’m trying to find the mass flow rate through a cylinder in dsmcFoam. I used the blockMesh then snappyHexMesh for the geom…

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## [Save Multiple Animations at Once](https://discourse.paraview.org/t/save-multiple-animations-at-once/6491)

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**Author:** [@woodscn](https://discourse.paraview.org/u/woodscn)\
**Replies:** 4\
**Last updated:** [February 18, 2021, 4:55pm UTC](https://discourse.paraview.org/t/save-multiple-animations-at-once/6491 "2021-02-18T16:55:19Z")

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I’ve set up multiple, fairly complex, layouts composed of multiple data sets, and I want to animate them over time steps. Is there a way to save images for all of my layouts simultaneously so that I don’t have to load/un…

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## [Unsymmetric contour rendered by symmetric data](https://discourse.paraview.org/t/unsymmetric-contour-rendered-by-symmetric-data/4118)

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**Author:** [@Jingle](https://discourse.paraview.org/u/Jingle)\
**Replies:** 19\
**Last updated:** [February 18, 2021, 4:13pm UTC](https://discourse.paraview.org/t/unsymmetric-contour-rendered-by-symmetric-data/4118 "2021-02-18T16:13:44Z")

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Hi all, I’m a green hand of Paraview. I have a test dataset (UNSTRUCTURED\_GRID) that is symmetic about the x axis, however the contour is unsymmetric rendered by Paraview. I am puzzled and can’t find out the reason. Th…

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## [ParaView - Discrete Marching Cubes](https://discourse.paraview.org/t/paraview-discrete-marching-cubes/6493)

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**Author:** [@mostafa](https://discourse.paraview.org/u/mostafa)\
**Replies:** 1\
**Last updated:** [February 18, 2021, 3:24pm UTC](https://discourse.paraview.org/t/paraview-discrete-marching-cubes/6493 "2021-02-18T15:24:46Z")

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Hi, Is there a way to use vtkDiscreteMarchingCubes algorithm from within ParaView? https://vtk.org/doc/nightly/html/classvtkDiscreteMarchingCubes.html Thanks for advance.

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## [Patchy appearance of zoomed in surfaces](https://discourse.paraview.org/t/patchy-appearance-of-zoomed-in-surfaces/6479)

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**Author:** [@GomerOfDoom](https://discourse.paraview.org/u/GomerOfDoom)\
**Replies:** 8\
**Last updated:** [February 17, 2021, 11:05pm UTC](https://discourse.paraview.org/t/patchy-appearance-of-zoomed-in-surfaces/6479 "2021-02-17T23:05:22Z")

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Hello, I have been seeing this issue for a while on the last few releases of Paraview. I just downloaded and installed 5.9, and I’m still seeing it, so I figured it was finally time to address it. Zoomed out, things lo…

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## [Export lines to CVS while keeping the order of points](https://discourse.paraview.org/t/export-lines-to-cvs-while-keeping-the-order-of-points/6483)

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**Author:** [@yzhuang](https://discourse.paraview.org/u/yzhuang)\
**Replies:** 4\
**Last updated:** [February 17, 2021, 10:10pm UTC](https://discourse.paraview.org/t/export-lines-to-cvs-while-keeping-the-order-of-points/6483 "2021-02-17T22:10:32Z")

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I have got some curves(cross-section of 2 groups of iso-surfaces) in Paraview and would like to detect the features (position,length, and so on) of these curves. The curves I got look like this: What I am trying to d…

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## [Mapping a surface data and curves onto a plane](https://discourse.paraview.org/t/mapping-a-surface-data-and-curves-onto-a-plane/6485)

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**Author:** [@jdesman1](https://discourse.paraview.org/u/jdesman1)\
**Replies:** 0\
**Last updated:** [February 17, 2021, 3:43pm UTC](https://discourse.paraview.org/t/mapping-a-surface-data-and-curves-onto-a-plane/6485 "2021-02-17T15:43:43Z")

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Hi, I have a variety of surfaces and curves .vtk files that are related to each other. I was wondering if it was possible to take a surface and a curves object, and project them onto a set 2D plane. Essentially, to take…

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