# ParaView Support

**URL:** https://discourse.paraview.org/c/paraview-support/7.md?page=212

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**Page:** 213

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## [Crash of \*.vtk file if stored and reopened in ASCII](https://discourse.paraview.org/t/crash-of-vtk-file-if-stored-and-reopened-in-ascii/1819)

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**Author:** [@Gerald\_Lodron](https://discourse.paraview.org/u/Gerald_Lodron)\
**Replies:** 3\
**Last updated:** [May 10, 2019, 11:51am UTC](https://discourse.paraview.org/t/crash-of-vtk-file-if-stored-and-reopened-in-ascii/1819 "2019-05-10T11:51:38Z")

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Create an arbitrary vtkPolyData object with some data stored in Field Data and store it with vtkPolyDataWriter in ASCII format. If you open it in paraview it crashes. If you store it in Binary format it works… As an exa…

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## [PLY export with color with Scalar](https://discourse.paraview.org/t/ply-export-with-color-with-scalar/1804)

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**Author:** [@Gerald\_Lodron](https://discourse.paraview.org/u/Gerald_Lodron)\
**Replies:** 23\
**Last updated:** [May 10, 2019, 8:41am UTC](https://discourse.paraview.org/t/ply-export-with-color-with-scalar/1804 "2019-05-10T08:41:40Z")

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Hi I want to export a vtkPolyData Dataset with “color” unsigned char\[3\] Point Data array as colored PLY data set. The problem is that paraview always uses the color of the lookuptable (as “MapScalars” checkbox would be …

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## [Same edit color in two differents pictures](https://discourse.paraview.org/t/same-edit-color-in-two-differents-pictures/1811)

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**Author:** [@Aicha](https://discourse.paraview.org/u/Aicha)\
**Replies:** 0\
**Last updated:** [May 9, 2019, 6:30pm UTC](https://discourse.paraview.org/t/same-edit-color-in-two-differents-pictures/1811 "2019-05-09T18:30:44Z")

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Hi i have two .vtu files and i want to have the same edit color in the two pictures (values and colors) w\_0.vtu (3.7 MB) u\_0.vtu (3.7 MB) How we can do this? Please. Kind regards

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## [Trace recorder misses edit color palette](https://discourse.paraview.org/t/trace-recorder-misses-edit-color-palette/1799)

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**Author:** [@wascott](https://discourse.paraview.org/u/wascott)\
**Replies:** 1\
**Last updated:** [May 9, 2019, 7:51am UTC](https://discourse.paraview.org/t/trace-recorder-misses-edit-color-palette/1799 "2019-05-09T07:51:32Z")

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The trace recorder misses editing the color palette. Could someone give me the commands to put in the Python trace to edit the color palette? Thanks, Alan

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## [issues with Volume visualization](https://discourse.paraview.org/t/issues-with-volume-visualization/1798)

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**Author:** [@kmilo9999](https://discourse.paraview.org/u/kmilo9999)\
**Replies:** 0\
**Last updated:** [May 8, 2019, 6:43pm UTC](https://discourse.paraview.org/t/issues-with-volume-visualization/1798 "2019-05-08T18:43:56Z")

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Hi, I am loading a large dataset using remote rendering. I’m applying a opacity transfer function to highlight zones of interest, but I don’t see anything changing on screen. Maybe it is just too dark or maybe is not ev…

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## [Coloring isosurfaces in Paraview](https://discourse.paraview.org/t/coloring-isosurfaces-in-paraview/1747)

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**Author:** [@DanPar](https://discourse.paraview.org/u/DanPar)\
**Replies:** 3\
**Last updated:** [May 8, 2019, 9:41am UTC](https://discourse.paraview.org/t/coloring-isosurfaces-in-paraview/1747 "2019-05-08T09:41:49Z")

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Hi to everyone, I have plotted the contour of a variable, for example component u of the velocity, now when i am setting the coloring value in Coloring section i can not select as reference the variable v, but only the …

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## [Head loss](https://discourse.paraview.org/t/head-loss/1786)

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**Author:** [@red\_armyy](https://discourse.paraview.org/u/red_armyy)\
**Replies:** 1\
**Last updated:** [May 7, 2019, 6:09pm UTC](https://discourse.paraview.org/t/head-loss/1786 "2019-05-07T18:09:37Z")

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Hello any one knows a good way how to visualize a head loss effect inside a 3D cylinder in paraview, a tutoriel would be very helpfull Thank you

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## [Visualisation of quadratic cells](https://discourse.paraview.org/t/visualisation-of-quadratic-cells/1785)

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**Author:** [@Bjeffus](https://discourse.paraview.org/u/Bjeffus)\
**Replies:** 3\
**Last updated:** [May 7, 2019, 12:33pm UTC](https://discourse.paraview.org/t/visualisation-of-quadratic-cells/1785 "2019-05-07T12:33:05Z")

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Hello, So I’m working with visualising a hemisphere partitioned into triangular cells. How can i visualise the curved edges? I’ve tried using the Extract Surface-filter with Nonlinear Subdivision Level, but i do not wa…

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## [Best approach to downsample composite dataset?](https://discourse.paraview.org/t/best-approach-to-downsample-composite-dataset/1751)

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**Author:** [@terryturton](https://discourse.paraview.org/u/terryturton)\
**Replies:** 1\
**Last updated:** [May 7, 2019, 12:00am UTC](https://discourse.paraview.org/t/best-approach-to-downsample-composite-dataset/1751 "2019-05-07T00:00:02Z")

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Hi, we have a composite dataset (.vtu) files and would like to downsample the data. Our solution was to merge blocks and apply a glyph filter with uniform spatial distribution since Extract Subset doesn’t work on a comp…

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## [Mass flow rate evaluation using Plot Selections Over Time](https://discourse.paraview.org/t/mass-flow-rate-evaluation-using-plot-selections-over-time/1779)

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**Author:** [@Yevgen](https://discourse.paraview.org/u/Yevgen)\
**Replies:** 0\
**Last updated:** [May 6, 2019, 2:41pm UTC](https://discourse.paraview.org/t/mass-flow-rate-evaluation-using-plot-selections-over-time/1779 "2019-05-06T14:41:15Z")

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Hello. I use OpenFOAM for simulation of water transport in pipes by VOF method and ParaView for post-processing of the results. I am facing face with the problem in ParaView when I am trying to evaluate water flow rate …

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## [Paraview 5.6 does not interpolate point data](https://discourse.paraview.org/t/paraview-5-6-does-not-interpolate-point-data/1770)

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**Author:** [@Rojj](https://discourse.paraview.org/u/Rojj)\
**Replies:** 2\
**Last updated:** [May 6, 2019, 2:22pm UTC](https://discourse.paraview.org/t/paraview-5-6-does-not-interpolate-point-data/1770 "2019-05-06T14:22:15Z")

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I have noticed a different behaviour between Paraview 5.6 and 4.4. radiation\_surface\_total\_shortwave\_ssaw-maen-smtwtfs\_avg.vtk (36.0 KB) Have a look at the attached file. In Paraview 4.4, when I select Miscellaneous -\>…

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## [Visualization of cumulative value of a variable with respect to time.](https://discourse.paraview.org/t/visualization-of-cumulative-value-of-a-variable-with-respect-to-time/1777)

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**Author:** [@CHAMANTH](https://discourse.paraview.org/u/CHAMANTH)\
**Replies:** 0\
**Last updated:** [May 6, 2019, 1:43pm UTC](https://discourse.paraview.org/t/visualization-of-cumulative-value-of-a-variable-with-respect-to-time/1777 "2019-05-06T13:43:38Z")

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Hi everyone, I have multiple vtk files of a process (around 50 time-steps). Visualising a particular variable with different time steps is straight forward in Paraview. I am interested to see the visualization of the…

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## [Select a cell in python script](https://discourse.paraview.org/t/select-a-cell-in-python-script/1730)

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**Author:** [@Mariana\_Rodriguez](https://discourse.paraview.org/u/Mariana_Rodriguez)\
**Replies:** 7\
**Last updated:** [May 6, 2019, 10:44am UTC](https://discourse.paraview.org/t/select-a-cell-in-python-script/1730 "2019-05-06T10:44:15Z")

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I am using Python script to select a cell in the mesh. I want to get its information: its nodes and their coordinates. What is the command in the script to select a cell? Thank you.

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## [Resample AMR Returning Empty Dataset](https://discourse.paraview.org/t/resample-amr-returning-empty-dataset/1760)

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**Author:** [@theodorebaltis](https://discourse.paraview.org/u/theodorebaltis)\
**Replies:** 0\
**Last updated:** [May 3, 2019, 10:11pm UTC](https://discourse.paraview.org/t/resample-amr-returning-empty-dataset/1760 "2019-05-03T22:11:46Z")

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Hello, I’m trying to resample an OverlappingAMRDataset using the Resample AMR filter and no matter what parameters I use I am always returned an empty dataset. No cells, points, or anything. I’m running a compiled vers…

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## [Ignoring voids when Interpolating the 2D points dataset on a regular grid](https://discourse.paraview.org/t/ignoring-voids-when-interpolating-the-2d-points-dataset-on-a-regular-grid/1661)

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**Author:** [@soroushkouhi](https://discourse.paraview.org/u/soroushkouhi)\
**Replies:** 5\
**Last updated:** [May 3, 2019, 7:21pm UTC](https://discourse.paraview.org/t/ignoring-voids-when-interpolating-the-2d-points-dataset-on-a-regular-grid/1661 "2019-05-03T19:21:41Z")

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HI, I am using point plane interpolator to interpolate point properties (from SPH results) on a regular grid; however, I like to have the voids in the domain as zero or null in the dataset. But point plane interpolator …

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## [can not plot Dualsphysics output over line](https://discourse.paraview.org/t/can-not-plot-dualsphysics-output-over-line/1758)

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**Author:** [@soroushkouhi](https://discourse.paraview.org/u/soroushkouhi)\
**Replies:** 0\
**Last updated:** [May 3, 2019, 4:56pm UTC](https://discourse.paraview.org/t/can-not-plot-dualsphysics-output-over-line/1758 "2019-05-03T16:56:14Z")

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Hi All, I am trying to plot different output variables of Dualsphysics over a line, but Paraview has error doing that. Therefore, I am interpolating those output on a plane, then plot from the new plane over the line! H…

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## [VTKm performance](https://discourse.paraview.org/t/vtkm-performance/1756)

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**Author:** [@Sumin](https://discourse.paraview.org/u/Sumin)\
**Replies:** 0\
**Last updated:** [May 3, 2019, 8:45am UTC](https://discourse.paraview.org/t/vtkm-performance/1756 "2019-05-03T08:45:41Z")

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I’m experimenting with Paraview’s Contour filter. In the experimental results, when applying the vtkm contour filter (with CUDA), “vtkGeometryReperesentationWithFaces” item takes a very short time (less than 10 ms) in …

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## [Compatbility with older Linux OS versions](https://discourse.paraview.org/t/compatbility-with-older-linux-os-versions/1272)

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**Author:** [@JDStuart](https://discourse.paraview.org/u/JDStuart)\
**Replies:** 6\
**Last updated:** [May 2, 2019, 3:43pm UTC](https://discourse.paraview.org/t/compatbility-with-older-linux-os-versions/1272 "2019-05-02T15:43:26Z")

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Hi - Is there a compatibility matrix for 5.5.2 & which Operating Systems are supported? I’m running sles 11 patch 4 which is quite old and getting some QT lib errors: symbol lookup error: /lustre/apps/ParaView/ParaView…

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## [Discontinuity in output of GradientOfUnstructuredDataSet](https://discourse.paraview.org/t/discontinuity-in-output-of-gradientofunstructureddataset/1738)

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**Author:** [@brenerrr](https://discourse.paraview.org/u/brenerrr)\
**Replies:** 1\
**Last updated:** [May 2, 2019, 3:33pm UTC](https://discourse.paraview.org/t/discontinuity-in-output-of-gradientofunstructureddataset/1738 "2019-05-02T15:33:32Z")

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I currently have a snapshot of a CFD simulation in CGNS format with 10 zones as shown below. When I calculate Q-Criterion with the GradientOfUnstructuredDataSet filter, discontinuities appear at the zones’ boundaries.…

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## [CGNS v3.4.0](https://discourse.paraview.org/t/cgns-v3-4-0/1749)

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**Author:** [@xgarnaud](https://discourse.paraview.org/u/xgarnaud)\
**Replies:** 2\
**Last updated:** [May 2, 2019, 2:23pm UTC](https://discourse.paraview.org/t/cgns-v3-4-0/1749 "2019-05-02T14:23:53Z")

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Dear all, It seems there has been a change in the CGNS library in the way to save polygonal / polyhedral and mixed element meshes. Do you know if this is already supported in paraview? will the paraview reader remain c…

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## [Efficiency in dynamic flow visualization](https://discourse.paraview.org/t/efficiency-in-dynamic-flow-visualization/1744)

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**Author:** [@Toorall](https://discourse.paraview.org/u/Toorall)\
**Replies:** 1\
**Last updated:** [May 1, 2019, 4:06pm UTC](https://discourse.paraview.org/t/efficiency-in-dynamic-flow-visualization/1744 "2019-05-01T16:06:38Z")

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Hello everyone, My goal is to visualize a dynamic flow simulation of a petroleum reservoir, to do that I use unstructured vtk grid format (.vtu) and to see the change in dynamic properties over time I use (.pvd). So I c…

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## [Merge Consecutive Delimeters breaks Detect Numeric Columns](https://discourse.paraview.org/t/merge-consecutive-delimeters-breaks-detect-numeric-columns/1666)

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**Author:** [@w.perry](https://discourse.paraview.org/u/w.perry)\
**Replies:** 0\
**Last updated:** [April 15, 2019, 9:01pm UTC](https://discourse.paraview.org/t/merge-consecutive-delimeters-breaks-detect-numeric-columns/1666 "2019-04-15T21:01:00Z")

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Hello, I have a space-separated file with only numeric data. Columns of the data are either in integer format or X.XXXXXXXXE+YY format. The only thing separating the values are spaces, and each column of numbers has th…

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## [Displaying vectors on xyz coordinates](https://discourse.paraview.org/t/displaying-vectors-on-xyz-coordinates/1711)

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**Author:** [@SimonTurner](https://discourse.paraview.org/u/SimonTurner)\
**Replies:** 3\
**Last updated:** [April 30, 2019, 12:58pm UTC](https://discourse.paraview.org/t/displaying-vectors-on-xyz-coordinates/1711 "2019-04-30T12:58:24Z")

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G’Day, new to this. I have CSV data containing xyz coordinate (geometry data) and numerous velocity data (direction, magnitude, absolute velocity etc) I can display my geometry xyz data using Table to Points filter, an…

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## [Does PV accept a time-varying PolyData file (and how would that file look like)?](https://discourse.paraview.org/t/does-pv-accept-a-time-varying-polydata-file-and-how-would-that-file-look-like/1735)

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**Author:** [@Adrian](https://discourse.paraview.org/u/Adrian)\
**Replies:** 5\
**Last updated:** [April 30, 2019, 8:13am UTC](https://discourse.paraview.org/t/does-pv-accept-a-time-varying-polydata-file-and-how-would-that-file-look-like/1735 "2019-04-30T08:13:03Z")

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I have been looking at the examples in the documentation but I am unsure about this. What I want is to write a file containing points (X, Y, Z) and some scalar data associated to it. This is perfectly doable in a vtu or …

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## [histogram selection - vtkSMSessionClient Server failed to gather information](https://discourse.paraview.org/t/histogram-selection-vtksmsessionclient-server-failed-to-gather-information/1739)

<div class="topic-metadata">

**Author:** [@kmilo9999](https://discourse.paraview.org/u/kmilo9999)\
**Replies:** 0\
**Last updated:** [April 30, 2019, 12:26am UTC](https://discourse.paraview.org/t/histogram-selection-vtksmsessionclient-server-failed-to-gather-information/1739 "2019-04-30T00:26:32Z")

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Hi, Whenever I try to select data form the histogram a long process takes place. After 8 to 10 minutes I get: ERROR: In /gpfs/runtime/opt/paraview/5.6.0\_RS/src/Paraview/VTK/Common/System/vtkSocket.cxx, line 567 vtkCli…

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## [Vorticity and Gradient python calculator calculation(gives wrong result-Lagrange hexahedron)](https://discourse.paraview.org/t/vorticity-and-gradient-python-calculator-calculation-gives-wrong-result-lagrange-hexahedron/1514)

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**Author:** [@vrkssai](https://discourse.paraview.org/u/vrkssai)\
**Replies:** 7\
**Last updated:** [April 29, 2019, 7:44pm UTC](https://discourse.paraview.org/t/vorticity-and-gradient-python-calculator-calculation-gives-wrong-result-lagrange-hexahedron/1514 "2019-04-29T19:44:53Z")

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Vorticity calculated for a smooth vortex function using python calculator as curl(Velocity) gives wrong result using the Legrange Hexahedron element. I tried to plot the same in tecplot using a point data and traingulati…

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## [Superbuild error "Could NOT find Python3" with 5.6.0-RC2](https://discourse.paraview.org/t/superbuild-error-could-not-find-python3-with-5-6-0-rc2/1731)

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**Author:** [@gridley](https://discourse.paraview.org/u/gridley)\
**Replies:** 9\
**Last updated:** [April 29, 2019, 5:55pm UTC](https://discourse.paraview.org/t/superbuild-error-could-not-find-python3-with-5-6-0-rc2/1731 "2019-04-29T17:55:31Z")

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Hi all, I get the error that superbuild can’t find Python3. This especially confuses me since I don’t use the system-provided python. I would expect superbuild to fetch is automatically. Here are my cmake options: cma…

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## [Trace, clip, color bar scale range](https://discourse.paraview.org/t/trace-clip-color-bar-scale-range/1728)

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**Author:** [@yamartinezgomez](https://discourse.paraview.org/u/yamartinezgomez)\
**Replies:** 5\
**Last updated:** [April 29, 2019, 2:59pm UTC](https://discourse.paraview.org/t/trace-clip-color-bar-scale-range/1728 "2019-04-29T14:59:41Z")

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Hello, I am recording a trace for two vtk files (each vtk file has its own renderview window) that takes and saves pictures (screenshots) of three different camera positions. The first two camera positions have a differ…

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## [Samrai reader error](https://discourse.paraview.org/t/samrai-reader-error/1506)

<div class="topic-metadata">

**Author:** [@kaiser](https://discourse.paraview.org/u/kaiser)\
**Replies:** 8\
**Last updated:** [April 29, 2019, 11:05am UTC](https://discourse.paraview.org/t/samrai-reader-error/1506 "2019-04-29T11:05:46Z")

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Hello, I am running simulations with IBAMR, a cfd library, that outputs data in samrai format. I would like to visualize this in paraview, but am getting errors from the samrai reader. If I load the file, the amr mesh …

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## [function plotting](https://discourse.paraview.org/t/function-plotting/1713)

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**Author:** [@greenwade](https://discourse.paraview.org/u/greenwade)\
**Replies:** 1\
**Last updated:** [April 29, 2019, 8:26am UTC](https://discourse.paraview.org/t/function-plotting/1713 "2019-04-29T08:26:04Z")

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Probably newbie question, if so I’ll apologize in advance. I’m looking to plot math expressions, either y=f(x), z=f(x,y) or w=f(x,y,z). Ideally I’d like to specify the functions, give it ranges for the domain variables,…

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