# ParaView Support

**URL:** https://discourse.paraview.org/c/paraview-support/7.md?no_subcategories=false&page=218

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**Page:** 219

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## [Artifacts and poor performance of ParaView with vtkOpenGLVolumeRayCastMapper with high values of ScalarOpacityUnitDistance](https://discourse.paraview.org/t/artifacts-and-poor-performance-of-paraview-with-vtkopenglvolumeraycastmapper-with-high-values-of-scalaropacityunitdistance/1279)

<div class="topic-metadata">

**Author:** [@knolla](https://discourse.paraview.org/u/knolla)\
**Replies:** 0\
**Last updated:** [February 12, 2019, 6:33pm UTC](https://discourse.paraview.org/t/artifacts-and-poor-performance-of-paraview-with-vtkopenglvolumeraycastmapper-with-high-values-of-scalaropacityunitdistance/1279 "2019-02-12T18:33:37Z")

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Is there a good overview of how OpenGL 2 volume rendering in VTK is currently implemented? I’m reading through the code (e.g., vtkOpenGLGPUVolumeRayCastMapper.cxx), trying to understand performance and a few interesting…

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## [How to show vtkUnstructuredGrid in pvpython of paraview?](https://discourse.paraview.org/t/how-to-show-vtkunstructuredgrid-in-pvpython-of-paraview/1261)

<div class="topic-metadata">

**Author:** [@weihuayi](https://discourse.paraview.org/u/weihuayi)\
**Replies:** 2\
**Last updated:** [February 11, 2019, 3:45pm UTC](https://discourse.paraview.org/t/how-to-show-vtkunstructuredgrid-in-pvpython-of-paraview/1261 "2019-02-11T15:45:45Z")

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I install paraview 5.6 on my Ubuntu 18.04 system and I want to write a python script to show a vtkUnstructuredGrid. import numpy as np from paraview.simple import \* import paraview.vtk as vtk from paraview.vtk.numpy\_int…

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## [How to eliminate the noises generated by the SurfaceLIC as attached](https://discourse.paraview.org/t/how-to-eliminate-the-noises-generated-by-the-surfacelic-as-attached/614)

<div class="topic-metadata">

**Author:** [@thomasng](https://discourse.paraview.org/u/thomasng)\
**Replies:** 2\
**Last updated:** [February 11, 2019, 3:30pm UTC](https://discourse.paraview.org/t/how-to-eliminate-the-noises-generated-by-the-surfacelic-as-attached/614 "2019-02-11T15:30:24Z")

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Hi, anyone, It is fined to see the cool streaming generated by the Surface LIC, but the noise comes together is unlikely to visualize the data very well. Would anyone propose the way to eliminate it or provide the ex…

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## [Performance problems: data format & amount of data per pvserver?](https://discourse.paraview.org/t/performance-problems-data-format-amount-of-data-per-pvserver/1208)

<div class="topic-metadata">

**Author:** [@Erik\_Keever](https://discourse.paraview.org/u/Erik_Keever)\
**Replies:** 5\
**Last updated:** [February 11, 2019, 2:53pm UTC](https://discourse.paraview.org/t/performance-problems-data-format-amount-of-data-per-pvserver/1208 "2019-02-11T14:53:01Z")

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Hello, I am hoping to use PV to visualize a structured grid DNS with ~900M cells. As a prelude I’m trying to get client/server mode working and performant on my local cluster and… there are… some performance problems to…

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## [Read performance problems (serial & parallel)](https://discourse.paraview.org/t/read-performance-problems-serial-parallel/1244)

<div class="topic-metadata">

**Author:** [@Erik\_Keever](https://discourse.paraview.org/u/Erik_Keever)\
**Replies:** 2\
**Last updated:** [February 11, 2019, 12:52am UTC](https://discourse.paraview.org/t/read-performance-problems-serial-parallel/1244 "2019-02-11T00:52:10Z")

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Hello, I need to use PV to visualize/analyze \>1TB data sets (900M cell structured grid time series) in which each stored data frame is approximately 50GB. I am preparing by making sure I can efficiently access a much s…

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## [Segmentation fault while Visualizing/Creating contours,slices.](https://discourse.paraview.org/t/segmentation-fault-while-visualizing-creating-contours-slices/1258)

<div class="topic-metadata">

**Author:** [@vrkssai](https://discourse.paraview.org/u/vrkssai)\
**Replies:** 2\
**Last updated:** [February 8, 2019, 10:34pm UTC](https://discourse.paraview.org/t/segmentation-fault-while-visualizing-creating-contours-slices/1258 "2019-02-08T22:34:33Z")

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Loading a 2x2x2 dimensions lagrange hexahedron element type of order 1 and trying to visualize the slices, clipping or contour leads to segmentation fault. I suspected corrupted vtk file so I created a sample element fro…

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## [pvpython startup crash (5.5.2, Arch Linux)](https://discourse.paraview.org/t/pvpython-startup-crash-5-5-2-arch-linux/551)

<div class="topic-metadata">

**Author:** [@Daan\_van\_Vugt](https://discourse.paraview.org/u/Daan_van_Vugt)\
**Replies:** 3\
**Last updated:** [February 8, 2019, 7:29pm UTC](https://discourse.paraview.org/t/pvpython-startup-crash-5-5-2-arch-linux/551 "2019-02-08T19:29:27Z")

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On startup of pvpython it crashes immediately after the update to 5.5.2. Additionally, my python plugins crash with a similar segmentation fault now. /tmp  pvpython …

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## [Current limitations for volume rendering of voxel data (e.g. extents, amount of data)](https://discourse.paraview.org/t/current-limitations-for-volume-rendering-of-voxel-data-e-g-extents-amount-of-data/1255)

<div class="topic-metadata">

**Author:** [@romangrothausmann](https://discourse.paraview.org/u/romangrothausmann)\
**Replies:** 0\
**Last updated:** [February 8, 2019, 3:26pm UTC](https://discourse.paraview.org/t/current-limitations-for-volume-rendering-of-voxel-data-e-g-extents-amount-of-data/1255 "2019-02-08T15:26:41Z")

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Hello! What are the current (known) limitations for volume rendering (VR) of voxel data in PV? For example, a dataset of ours has about 23e9 voxels (3000 x 3000 x 2607, i.e. ~ 23.4GB) which I cannot get a VR of (all bl…

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## [Determine what part of a source leaves an outflow point](https://discourse.paraview.org/t/determine-what-part-of-a-source-leaves-an-outflow-point/1219)

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**Author:** [@MarkB](https://discourse.paraview.org/u/MarkB)\
**Replies:** 2\
**Last updated:** [February 8, 2019, 7:42am UTC](https://discourse.paraview.org/t/determine-what-part-of-a-source-leaves-an-outflow-point/1219 "2019-02-08T07:42:51Z")

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Hi all, I have an incompressible flow simulation from openfoam where I have 2 inlets and 2 outlets. How can I determine what part of inlet 1 is leaving though outlet 2? Is there a tracer/filter I can use for this? Th…

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## [How setting a plane to digitize PolyLineSource with widget](https://discourse.paraview.org/t/how-setting-a-plane-to-digitize-polylinesource-with-widget/1248)

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**Author:** [@opengeostat](https://discourse.paraview.org/u/opengeostat)\
**Replies:** 1\
**Last updated:** [February 7, 2019, 2:32pm UTC](https://discourse.paraview.org/t/how-setting-a-plane-to-digitize-polylinesource-with-widget/1248 "2019-02-07T14:32:53Z")

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Hi Comunity! I would like to “draw” polylines in an arbitrary plane, let say XY, using Alt+Click and the PolyLineSource Widget but I find difficult setting the elevation (Z) of the plane where the point is placed. The w…

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## [SaveAnimation from pvpython doesn't take FrameRate option into account](https://discourse.paraview.org/t/saveanimation-from-pvpython-doesnt-take-framerate-option-into-account/1237)

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**Author:** [@idcbris](https://discourse.paraview.org/u/idcbris)\
**Replies:** 1\
**Last updated:** [February 6, 2019, 9:07am UTC](https://discourse.paraview.org/t/saveanimation-from-pvpython-doesnt-take-framerate-option-into-account/1237 "2019-02-06T09:07:11Z")

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Hello there, I’m using pvpython to automate movies generation but somehow the FrameRate option is not working and defaults to 10 fps. Note that I’m writing to a .avi file When running the paraview gui this however work…

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## [QPainter::begin: Paint device returned engine == 0, type:2](https://discourse.paraview.org/t/qpainter-paint-device-returned-engine-0-type-2/1239)

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**Author:** [@wascott](https://discourse.paraview.org/u/wascott)\
**Replies:** 1\
**Last updated:** [February 6, 2019, 9:05am UTC](https://discourse.paraview.org/t/qpainter-paint-device-returned-engine-0-type-2/1239 "2019-02-06T09:05:51Z")

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I have a user that is receiving the following error. This is in Linux, 5.6.0. QPainter::begin: Paint device returned engine == 0, type:2 It doesn’t appear to be hurting ParaView, but is annoying. Any ideas? Thanks, …

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## [Extract and plot cell centrered only data in plot over line](https://discourse.paraview.org/t/extract-and-plot-cell-centrered-only-data-in-plot-over-line/1181)

<div class="topic-metadata">

**Author:** [@a-jp](https://discourse.paraview.org/u/a-jp)\
**Replies:** 1\
**Last updated:** [February 5, 2019, 4:52pm UTC](https://discourse.paraview.org/t/extract-and-plot-cell-centrered-only-data-in-plot-over-line/1181 "2019-02-05T16:52:54Z")

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Hi, Been using paraview for a long time (probably going to regret saying that). Anyway, I have a cell-data only solution on a cgns mesh. Firstly, I want to plot over a line on the mesh and see only the data from the ce…

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## [can't view the new data array in Paraview](https://discourse.paraview.org/t/cant-view-the-new-data-array-in-paraview/1231)

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**Author:** [@fabio.romani](https://discourse.paraview.org/u/fabio.romani)\
**Replies:** 4\
**Last updated:** [February 5, 2019, 4:17pm UTC](https://discourse.paraview.org/t/cant-view-the-new-data-array-in-paraview/1231 "2019-02-05T16:17:59Z")

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Hi, very new here…I’m trying to modify a data array from a vtk file. I’m using the python shell (v3.14) …everything looks ok (no errors) but I can’t see my new array in the Data Arrays table widget. I can only see the o…

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## [Plot3d files visualization](https://discourse.paraview.org/t/plot3d-files-visualization/1217)

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**Author:** [@RaviGupta](https://discourse.paraview.org/u/RaviGupta)\
**Replies:** 4\
**Last updated:** [February 5, 2019, 5:38am UTC](https://discourse.paraview.org/t/plot3d-files-visualization/1217 "2019-02-05T05:38:36Z")

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Hi, I am using Paraview to visualize plot3d formatted data files. I am importing the data file into ParaView using reader file with extension .p3d . So my flow variables are coming as Function0, Function1, Function2 etc…

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## [ParaView minimum requirements (v 5.6)](https://discourse.paraview.org/t/paraview-minimum-requirements-v-5-6/1229)

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**Author:** [@Kenneth\_Moreland](https://discourse.paraview.org/u/Kenneth_Moreland)\
**Replies:** 1\
**Last updated:** [February 4, 2019, 5:05pm UTC](https://discourse.paraview.org/t/paraview-minimum-requirements-v-5-6/1229 "2019-02-04T17:05:22Z")

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I’ve recently been asked what are the minimum requirements for running ParaView. Does anyone have a list of the minimum requirements required for running ParaView. In particular, what are the minimum requirements for run…

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## [Voxels - remove above a certain surface](https://discourse.paraview.org/t/voxels-remove-above-a-certain-surface/1227)

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**Author:** [@fanfan](https://discourse.paraview.org/u/fanfan)\
**Replies:** 0\
**Last updated:** [February 3, 2019, 9:22pm UTC](https://discourse.paraview.org/t/voxels-remove-above-a-certain-surface/1227 "2019-02-03T21:22:05Z")

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Hi, I have a 3d raster and i would like to remove voxels above a DEM surface. I can use a 3d raster with cells or points. Thanks F

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## [VtkPlot3DmetaReader file](https://discourse.paraview.org/t/vtkplot3dmetareader-file/1224)

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**Author:** [@RaviGupta](https://discourse.paraview.org/u/RaviGupta)\
**Replies:** 0\
**Last updated:** [February 1, 2019, 4:37pm UTC](https://discourse.paraview.org/t/vtkplot3dmetareader-file/1224 "2019-02-01T16:37:59Z")

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Can anyone share VtkPlot3dMetaReader file? Thanks in advance

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## [Autoload Custom Filter at Startup](https://discourse.paraview.org/t/autoload-custom-filter-at-startup/1222)

<div class="topic-metadata">

**Author:** [@DennisConklin](https://discourse.paraview.org/u/DennisConklin)\
**Replies:** 3\
**Last updated:** [February 1, 2019, 3:51pm UTC](https://discourse.paraview.org/t/autoload-custom-filter-at-startup/1222 "2019-02-01T15:51:43Z")

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All, I am familiar with xml Server Side Plugins and I am able to autoload them at Startup by putting them in the PV\_PLUGIN\_PATH. I need to do something similar for a Custom Filter. The custom filter operates on an E…

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## [Glyph problem with paraview 5.6](https://discourse.paraview.org/t/glyph-problem-with-paraview-5-6/1204)

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**Author:** [@JULIO\_SOTELO](https://discourse.paraview.org/u/JULIO_SOTELO)\
**Replies:** 2\
**Last updated:** [February 1, 2019, 2:40pm UTC](https://discourse.paraview.org/t/glyph-problem-with-paraview-5-6/1204 "2019-02-01T14:40:04Z")

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Dear, I founded a problem with the glyph tool, in version 5.6 when I try to create a glyph (arrows) from a velocity vectors field map, I generate the arrows with the correct scale, but when I try to include information …

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## [Rename (F2) not working in Paraview 5.6](https://discourse.paraview.org/t/rename-f2-not-working-in-paraview-5-6/1221)

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**Author:** [@jvoor](https://discourse.paraview.org/u/jvoor)\
**Replies:** 2\
**Last updated:** [February 1, 2019, 11:29am UTC](https://discourse.paraview.org/t/rename-f2-not-working-in-paraview-5-6/1221 "2019-02-01T11:29:21Z")

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Using the rename pop-up window (F2 by default) does not change the name of my data set in the pipeline browser. To change the name I need to click twice (slowly) over the name in the pipeline browser. I think this is a …

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## [Revert time series](https://discourse.paraview.org/t/revert-time-series/1210)

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**Author:** [@rbeucher](https://discourse.paraview.org/u/rbeucher)\
**Replies:** 4\
**Last updated:** [February 1, 2019, 4:23am UTC](https://discourse.paraview.org/t/revert-time-series/1210 "2019-02-01T04:23:26Z")

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Hi All, Is it possible to revert the frame order so that the animation starts at the end and goes back in time? I would like to seed tracers at the end of a simulation and see where they have originated from. So it is…

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## [For tetrahedral mesh, how to get vertex IDs](https://discourse.paraview.org/t/for-tetrahedral-mesh-how-to-get-vertex-ids/1216)

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**Author:** [@Hamburgerfinger](https://discourse.paraview.org/u/Hamburgerfinger)\
**Replies:** 2\
**Last updated:** [February 1, 2019, 1:40am UTC](https://discourse.paraview.org/t/for-tetrahedral-mesh-how-to-get-vertex-ids/1216 "2019-02-01T01:40:34Z")

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If I import a tetrahedral mesh, I can see the coordinates of the vertices, by selecting “point data” in spreadsheet view. The corresponding “cell data” only shows the tetrahedral element number, its label value, and tha…

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## [Compiling without Qt to run a parallel server on a GPU cluster.](https://discourse.paraview.org/t/compiling-without-qt-to-run-a-parallel-server-on-a-gpu-cluster/1201)

<div class="topic-metadata">

**Author:** [@lukasWiel](https://discourse.paraview.org/u/lukasWiel)\
**Replies:** 5\
**Last updated:** [January 30, 2019, 8:51am UTC](https://discourse.paraview.org/t/compiling-without-qt-to-run-a-parallel-server-on-a-gpu-cluster/1201 "2019-01-30T08:51:07Z")

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Hello, experts and more experienced users. I aim to get a server-client Paraview setup to work on our cluster, which has GPU nodes, so that the server makes use of GPUs in the nodes. The GPU nodes do not have a desktop …

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## [Plot 3D stress diagrams](https://discourse.paraview.org/t/plot-3d-stress-diagrams/1202)

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**Author:** [@MarinaVendlCraveiro](https://discourse.paraview.org/u/MarinaVendlCraveiro)\
**Replies:** 0\
**Last updated:** [January 29, 2019, 9:02pm UTC](https://discourse.paraview.org/t/plot-3d-stress-diagrams/1202 "2019-01-29T21:02:46Z")

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Good night! I imported to Paraview the results of a 3D beam model. Then, i created a “slice” layer to draw the central cross section of the beam. Is it possible to draw a 3D diagram of stresses in this section? Best re…

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## [Cannot generate a safe runtime search path for target vtkRenderingOpenGL2](https://discourse.paraview.org/t/cannot-generate-a-safe-runtime-search-path-for-target-vtkrenderingopengl2/1162)

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**Author:** [@galitus](https://discourse.paraview.org/u/galitus)\
**Replies:** 15\
**Last updated:** [January 29, 2019, 3:48pm UTC](https://discourse.paraview.org/t/cannot-generate-a-safe-runtime-search-path-for-target-vtkrenderingopengl2/1162 "2019-01-29T15:48:02Z")

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Hey, I have trouble to compile paraview using the nvidia proprietary driver instead of the files which belongs to mesa. So the problem is that there is a libGL.so.1 in /usr/lib which belongs to mesa (18.2.8) and one in …

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## [graphic card issue ?](https://discourse.paraview.org/t/graphic-card-issue/1190)

<div class="topic-metadata">

**Author:** [@drudox00](https://discourse.paraview.org/u/drudox00)\
**Replies:** 14\
**Last updated:** [January 29, 2019, 2:12pm UTC](https://discourse.paraview.org/t/graphic-card-issue/1190 "2019-01-29T14:12:02Z")

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Hi everybody ! enjoy your sunday ! Some time when I have to post process a polymer (using spherical glyph as atoms and tube for the virtual connection) if the polymer chain going to collapse and the atoms are very close…

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## [Correlation Value Between Two VTK Files](https://discourse.paraview.org/t/correlation-value-between-two-vtk-files/1196)

<div class="topic-metadata">

**Author:** [@NGreen](https://discourse.paraview.org/u/NGreen)\
**Replies:** 0\
**Last updated:** [January 28, 2019, 5:23pm UTC](https://discourse.paraview.org/t/correlation-value-between-two-vtk-files/1196 "2019-01-28T17:23:06Z")

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I was wondering if there is an easy way to calculate the correlation of two VTK files using this software. I have not worked with ParaView before, and am looking for the best software to accomplish this task. If this is …

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## [Why Points/Wireframe display repr. only show outside faces](https://discourse.paraview.org/t/why-points-wireframe-display-repr-only-show-outside-faces/915)

<div class="topic-metadata">

**Author:** [@banesullivan](https://discourse.paraview.org/u/banesullivan)\
**Replies:** 6\
**Last updated:** [January 28, 2019, 5:03pm UTC](https://discourse.paraview.org/t/why-points-wireframe-display-repr-only-show-outside-faces/915 "2019-01-28T17:03:50Z")

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Why do the Points and Wireframe display representations only show external faces for vtkImageData and vtkRectilinearGrids? When I select Wireframe/Points, I want what the Extract Edges filter produces. And when I select P…

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## [visualize only a given number of cell inside a BOX domain](https://discourse.paraview.org/t/visualize-only-a-given-number-of-cell-inside-a-box-domain/1174)

<div class="topic-metadata">

**Author:** [@drudox00](https://discourse.paraview.org/u/drudox00)\
**Replies:** 9\
**Last updated:** [January 25, 2019, 8:50am UTC](https://discourse.paraview.org/t/visualize-only-a-given-number-of-cell-inside-a-box-domain/1174 "2019-01-25T08:50:59Z")

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Hi again !! I have one other target for the polymer chain animations (previous post) consider that I’m modelling a Box (very big compared with the polymer’s chain who is much smaller than one single cell) is to include …

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