# Development

**URL:** https://discourse.paraview.org/c/development/6.md?no_subcategories=false&page=32

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

**Page:** 33

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## [Reading and interpolations of velocity in staggered grid configuration in netCDFflies](https://discourse.paraview.org/t/reading-and-interpolations-of-velocity-in-staggered-grid-configuration-in-netcdfflies/2454)

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**Author:** [@samfr](https://discourse.paraview.org/u/samfr)\
**Replies:** 0\
**Last updated:** [August 20, 2019, 9:22am UTC](https://discourse.paraview.org/t/reading-and-interpolations-of-velocity-in-staggered-grid-configuration-in-netcdfflies/2454 "2019-08-20T09:22:37Z")

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I´m interested to use paraview to postprocess NEMO Oceanographic data which are stored in netCDF files. NEMO uses staggered grid and therefore the velocities are stored at the cell faces while scalars are stored in the c…

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## [Chained inheritance from vtkDataSetAlgorithm in TTK](https://discourse.paraview.org/t/chained-inheritance-from-vtkdatasetalgorithm-in-ttk/2347)

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**Author:** [@Jonas.Lukasczyk](https://discourse.paraview.org/u/Jonas.Lukasczyk)\
**Replies:** 14\
**Last updated:** [August 19, 2019, 1:25pm UTC](https://discourse.paraview.org/t/chained-inheritance-from-vtkdatasetalgorithm-in-ttk/2347 "2019-08-19T13:25:53Z")

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Hi everyone, I’m TTK developer and we are currently restructuring the VTK layer of TTK to simplify and standardize things. To this end, we want to create a new ‘ttkAlgorithm’ class that inherits from ‘vtkDataSetAlgorith…

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## [Error with vtkCSVWriter.cxx in ParaView 5.7.0-RC2](https://discourse.paraview.org/t/error-with-vtkcsvwriter-cxx-in-paraview-5-7-0-rc2/2435)

<div class="topic-metadata">

**Author:** [@joeh](https://discourse.paraview.org/u/joeh)\
**Replies:** 5\
**Last updated:** [August 15, 2019, 7:20pm UTC](https://discourse.paraview.org/t/error-with-vtkcsvwriter-cxx-in-paraview-5-7-0-rc2/2435 "2019-08-15T19:20:00Z")

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I am getting an error in vtkCSVWriter.cxx when using gcc 4.8.5 to build ParaView 5.7.0-RC2 This seems to have been introduced by the change last week to fix issue #19224 (Save Data, csv file, from streamtracer is bad) …

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## [proposal: change gitlab tag "ospray" to "ray tracing"](https://discourse.paraview.org/t/proposal-change-gitlab-tag-ospray-to-ray-tracing/2413)

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**Author:** [@Dave\_DeMarle](https://discourse.paraview.org/u/Dave_DeMarle)\
**Replies:** 1\
**Last updated:** [August 14, 2019, 11:43pm UTC](https://discourse.paraview.org/t/proposal-change-gitlab-tag-ospray-to-ray-tracing/2413 "2019-08-14T23:43:14Z")

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I would like to change the label:ospray tag in gitlab to label:ray tracing. The reason being that we now have two ray tracing backends and I expect that most issues and features will have both in common. Any objections? …

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## [VTKm compilation stall on ubuntu](https://discourse.paraview.org/t/vtkm-compilation-stall-on-ubuntu/2433)

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**Author:** [@mwestphal](https://discourse.paraview.org/u/mwestphal)\
**Replies:** 2\
**Last updated:** [August 14, 2019, 6:28pm UTC](https://discourse.paraview.org/t/vtkm-compilation-stall-on-ubuntu/2433 "2019-08-14T18:28:26Z")

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While compiling ParaView on modest (8 core, 8Gb ram) ubuntu 18.04, ParaView compilation stalled on VTKm. A few processes remained, using 50% of the memory but only 1% of the CPU. After I killed them, just restarting th…

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## [Install rules for external plugins in ParaView 5.7](https://discourse.paraview.org/t/install-rules-for-external-plugins-in-paraview-5-7/2387)

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**Author:** [@lhofmann](https://discourse.paraview.org/u/lhofmann)\
**Replies:** 2\
**Last updated:** [August 9, 2019, 6:58pm UTC](https://discourse.paraview.org/t/install-rules-for-external-plugins-in-paraview-5-7/2387 "2019-08-09T18:58:30Z")

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I would like to have install rules for my external plugins, such that I can simply run cmake --build --target install and have the plugins installed into a directory, where ParaView automatically loads them (i.e., I set C…

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## [VRML importer regression](https://discourse.paraview.org/t/vrml-importer-regression/2382)

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**Author:** [@Lorensen](https://discourse.paraview.org/u/Lorensen)\
**Replies:** 5\
**Last updated:** [August 9, 2019, 1:20pm UTC](https://discourse.paraview.org/t/vrml-importer-regression/2382 "2019-08-09T13:20:18Z")

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There is a regression between 4.1 and 5.0RC1. Here is the 4.1 vs the 5.0rc1 . The data I used is here.

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## [problem in "self"](https://discourse.paraview.org/t/problem-in-self/2367)

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**Author:** [@ikram](https://discourse.paraview.org/u/ikram)\
**Replies:** 15\
**Last updated:** [August 6, 2019, 7:53pm UTC](https://discourse.paraview.org/t/problem-in-self/2367 "2019-08-06T19:53:30Z")

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hi how can i fix this problem File “”, line 1, in NameError: name ‘self’ is not defined

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## [measure](https://discourse.paraview.org/t/measure/2366)

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**Author:** [@ikram](https://discourse.paraview.org/u/ikram)\
**Replies:** 0\
**Last updated:** [August 6, 2019, 10:45am UTC](https://discourse.paraview.org/t/measure/2366 "2019-08-06T10:45:06Z")

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hi, how can I measure a 3D object, and get the height , width and volume of this object with a python script code ? thx

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## [Replacement for IsFieldNeeded](https://discourse.paraview.org/t/replacement-for-isfieldneeded/2342)

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**Author:** [@kschau](https://discourse.paraview.org/u/kschau)\
**Replies:** 4\
**Last updated:** [August 4, 2019, 10:22am UTC](https://discourse.paraview.org/t/replacement-for-isfieldneeded/2342 "2019-08-04T10:22:17Z")

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Is there a replacement attribute or method for the IsFieldNeeded test in vtkCPInputDataDescription given that it is deprecated? This test seems ubiquitous in Catalyst examples, but I can’t figure out what I am supposed …

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## [How to determine one point is within one enclosed block or not](https://discourse.paraview.org/t/how-to-determine-one-point-is-within-one-enclosed-block-or-not/2314)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 0\
**Last updated:** [July 29, 2019, 1:34pm UTC](https://discourse.paraview.org/t/how-to-determine-one-point-is-within-one-enclosed-block-or-not/2314 "2019-07-29T13:34:59Z")

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Dear Experts, In my situation, there are tens of enclosed blocks, and when given one point, i need to check this point is in which block, or not in any block. my block is vtkPolyData, read from STL file. Is there any …

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## [3D vector field](https://discourse.paraview.org/t/3d-vector-field/2286)

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**Author:** [@98765](https://discourse.paraview.org/u/98765)\
**Replies:** 0\
**Last updated:** [July 24, 2019, 12:26am UTC](https://discourse.paraview.org/t/3d-vector-field/2286 "2019-07-24T00:26:04Z")

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Dear Sir or Madam, Recently, I want to draw a 3D vector field P(Px,Py,Pz) in 3D space (x,y,z) by using Paraview. I have got the data of Px,Py,Pz at each position (x,y,z), but I did not know how to combine them together…

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## [Identify Block on the client side](https://discourse.paraview.org/t/identify-block-on-the-client-side/2278)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 2\
**Last updated:** [July 23, 2019, 11:43pm UTC](https://discourse.paraview.org/t/identify-block-on-the-client-side/2278 "2019-07-23T23:43:21Z")

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Dear Experts, I found, after reading raw data from files into vtkMultiBlockDataSet, on the client side, i can only refer vtkPVCompositeDataInformation to get some simple block information. However, in my situation, I n…

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## [endUndoSet called without a beginUndoSet related to ContextView](https://discourse.paraview.org/t/endundoset-called-without-a-beginundoset-related-to-contextview/2235)

<div class="topic-metadata">

**Author:** [@mwestphal](https://discourse.paraview.org/u/mwestphal)\
**Replies:** 2\
**Last updated:** [July 23, 2019, 11:34am UTC](https://discourse.paraview.org/t/endundoset-called-without-a-beginundoset-related-to-contextview/2235 "2019-07-23T11:34:48Z")

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Anyone got a reliable way to reproduce this annoying warning when playing with ContextView in general ? It seems to show at random making it hard to track down.

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## [Re-post: Error messages in ParaView when reading in Transient OpenFoam test case](https://discourse.paraview.org/t/re-post-error-messages-in-paraview-when-reading-in-transient-openfoam-test-case/2257)

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**Author:** [@yek\_irani](https://discourse.paraview.org/u/yek_irani)\
**Replies:** 0\
**Last updated:** [July 19, 2019, 2:13am UTC](https://discourse.paraview.org/t/re-post-error-messages-in-paraview-when-reading-in-transient-openfoam-test-case/2257 "2019-07-19T02:13:51Z")

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Hello, This is a re-post of the following issue from the ParaView support forum: Error messages in ParaView 5.6.x when reading in Transient OpenFoam test case. I believe this to be a reproducible bug. Having obtained …

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## [Repost: Error importing transient OpenFoam (.foam) decomposed data with Paraview on Windows 10 platform](https://discourse.paraview.org/t/repost-error-importing-transient-openfoam-foam-decomposed-data-with-paraview-on-windows-10-platform/2256)

<div class="topic-metadata">

**Author:** [@yek\_irani](https://discourse.paraview.org/u/yek_irani)\
**Replies:** 0\
**Last updated:** [July 19, 2019, 2:04am UTC](https://discourse.paraview.org/t/repost-error-importing-transient-openfoam-foam-decomposed-data-with-paraview-on-windows-10-platform/2256 "2019-07-19T02:04:38Z")

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Hi, I’ve posted the following on the ParaView support fourm, but no one has answered it. I believe this to be a reproducible bug. Having obtained no response on the ParaView support forum, I am inclined to see if some…

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## [How to create tree view in Pipeline Browser](https://discourse.paraview.org/t/how-to-create-tree-view-in-pipeline-browser/2083)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 7\
**Last updated:** [July 18, 2019, 11:49am UTC](https://discourse.paraview.org/t/how-to-create-tree-view-in-pipeline-browser/2083 "2019-07-18T11:49:29Z")

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Dear Experts, I create a tree-view vtkMultiBlockDataSet, i can see this structure when open “MultiBlockInspector”, However, i want to “move” this tree-view into pipeline browser, it is more intuitive as i see it. So my…

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## [About build.md](https://discourse.paraview.org/t/about-build-md/2239)

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**Author:** [@mwestphal](https://discourse.paraview.org/u/mwestphal)\
**Replies:** 1\
**Last updated:** [July 17, 2019, 2:43pm UTC](https://discourse.paraview.org/t/about-build-md/2239 "2019-07-17T14:43:24Z")

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build.md is awesome, most of the information is here. It can, however, be overwhelming for a new user. I’m thinking of adding simpleBuildWindows.md and simpleBuildLinux.md are something along these lines. Unless we s…

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## [Is there any "CanFilter" APIs?](https://discourse.paraview.org/t/is-there-any-canfilter-apis/2222)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 4\
**Last updated:** [July 15, 2019, 4:02pm UTC](https://discourse.paraview.org/t/is-there-any-canfilter-apis/2222 "2019-07-15T16:02:40Z")

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I create my own filter, but these filter is just can use for my own “MyMultiBlockDataSet” which inherited from vtkMultiBlockDataSet. So i wonder is there any method i can check the input vtkMultiBlockDataSet to decide w…

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## [Gather Information from server](https://discourse.paraview.org/t/gather-information-from-server/2211)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 8\
**Last updated:** [July 15, 2019, 3:57pm UTC](https://discourse.paraview.org/t/gather-information-from-server/2211 "2019-07-15T15:57:20Z")

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Dear Experts, Does paraview provide the flexibility to develop my own SMproxy and my own vtkPVInformation, I want to display some information, that read from a server side, but i found it is difficult to transfer these …

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## [Adding support for xi:include](https://discourse.paraview.org/t/adding-support-for-xi-include/2159)

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**Author:** [@utkarsh.ayachit](https://discourse.paraview.org/u/utkarsh.ayachit)\
**Replies:** 4\
**Last updated:** [July 8, 2019, 7:47pm UTC](https://discourse.paraview.org/t/adding-support-for-xi-include/2159 "2019-07-08T19:47:50Z")

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The ParaView ServerManager configuration XML have grown to be quite complex over the years. To avoid duplication we came up with some idiosyncratic strategies in the past like base\_xmlgroup, base\_xmlname etc. I am wonder…

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## [Streamtracer path length calculation](https://discourse.paraview.org/t/streamtracer-path-length-calculation/2179)

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**Author:** [@momentumv](https://discourse.paraview.org/u/momentumv)\
**Replies:** 0\
**Last updated:** [July 8, 2019, 12:55pm UTC](https://discourse.paraview.org/t/streamtracer-path-length-calculation/2179 "2019-07-08T12:55:41Z")

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The streamtracer filter seems to be computing arclength oddly. I made a bug submission, but would appreciate any confirmation or discussion. https://gitlab.kitware.com/paraview/paraview/issues/19161

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## [ParaView asset store](https://discourse.paraview.org/t/paraview-asset-store/2142)

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**Author:** [@Misha](https://discourse.paraview.org/u/Misha)\
**Replies:** 1\
**Last updated:** [July 5, 2019, 11:30am UTC](https://discourse.paraview.org/t/paraview-asset-store/2142 "2019-07-05T11:30:17Z")

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Hi, I think that it will be a good idea to create a ParaView asset store, similar to Unity’s asset store. It would help everyone if people will be able to sell custom models, custom filters, plugins and saved states.

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## [Memory is increasing when add then delete sphere source repeatedly](https://discourse.paraview.org/t/memory-is-increasing-when-add-then-delete-sphere-source-repeatedly/2087)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 5\
**Last updated:** [June 29, 2019, 2:43am UTC](https://discourse.paraview.org/t/memory-is-increasing-when-add-then-delete-sphere-source-repeatedly/2087 "2019-06-29T02:43:23Z")

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Dear Experts, I am adding and deleting sphere source with resolution 80000, and open memory inspector to monitor the memory change, i found the memory is increasing all the time… What i expect is the memory should not …

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## [ParaView’s Python documentation for Legacy versions](https://discourse.paraview.org/t/paraview-s-python-documentation-for-legacy-versions/2136)

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**Author:** [@TST](https://discourse.paraview.org/u/TST)\
**Replies:** 1\
**Last updated:** [June 28, 2019, 11:05am UTC](https://discourse.paraview.org/t/paraview-s-python-documentation-for-legacy-versions/2136 "2019-06-28T11:05:19Z")

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Hi, I am currently using Paraview 5.4.0 with pvpython. Unfortunately updating the installation is not an option. I use the Python documentation at https://kitware.github.io/paraview-docs/latest/python/ quite a lot for w…

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## [Making client-side only C++ class accessible from Python](https://discourse.paraview.org/t/making-client-side-only-c-class-accessible-from-python/2094)

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**Author:** [@BetaRavener](https://discourse.paraview.org/u/BetaRavener)\
**Replies:** 8\
**Last updated:** [June 26, 2019, 12:46pm UTC](https://discourse.paraview.org/t/making-client-side-only-c-class-accessible-from-python/2094 "2019-06-26T12:46:05Z")

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Question: How to access C++ class from python that’s client-side only and has no XML file to wrap? Little background: As part of our application, I have implemented (via events) C++ class that allows camera to follow …

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## [EnSight Binary vs ASCII Format Erroneous Negative Values](https://discourse.paraview.org/t/ensight-binary-vs-ascii-format-erroneous-negative-values/2107)

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**Author:** [@jrweinmeister](https://discourse.paraview.org/u/jrweinmeister)\
**Replies:** 0\
**Last updated:** [June 25, 2019, 7:22pm UTC](https://discourse.paraview.org/t/ensight-binary-vs-ascii-format-erroneous-negative-values/2107 "2019-06-25T19:22:45Z")

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I have come across an issue where Fluent data exported in binary Ensight format can produce negative values for an all positive variable. However, the data gives appropriate values when exported in ASCII format from Flue…

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## [Embree problem with illegal instruction in ParaView 5.6.1](https://discourse.paraview.org/t/embree-problem-with-illegal-instruction-in-paraview-5-6-1/2070)

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**Author:** [@joeh](https://discourse.paraview.org/u/joeh)\
**Replies:** 4\
**Last updated:** [June 21, 2019, 3:12pm UTC](https://discourse.paraview.org/t/embree-problem-with-illegal-instruction-in-paraview-5-6-1/2070 "2019-06-21T15:12:02Z")

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Hello, I have found that there is a problem with compilation of ParaView 5.6.1 superbuild’s embree library for older Linux systems. The embree library seems to be calling avx instructions that are not present in these…

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## [Nvidia Index slower than VTK?](https://discourse.paraview.org/t/nvidia-index-slower-than-vtk/2060)

<div class="topic-metadata">

**Author:** [@klayman](https://discourse.paraview.org/u/klayman)\
**Replies:** 0\
**Last updated:** [June 17, 2019, 11:21am UTC](https://discourse.paraview.org/t/nvidia-index-slower-than-vtk/2060 "2019-06-17T11:21:00Z")

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Hello, I am rendering a CT volume 600x600x300, trying both “Volume”, which I suppose is implemented by the VtkOpenGlVolumeMapper, as well as NVidia Index. I thought Nvidia Index would be the best performer, but on my Qu…

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## [fetch fielddata to client](https://discourse.paraview.org/t/fetch-fielddata-to-client/2056)

<div class="topic-metadata">

**Author:** [@Felipe\_Bordeu](https://discourse.paraview.org/u/Felipe_Bordeu)\
**Replies:** 1\
**Last updated:** [June 17, 2019, 9:17am UTC](https://discourse.paraview.org/t/fetch-fielddata-to-client/2056 "2019-06-17T09:17:02Z")

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Hi, I have a customization of ParaView (using a c++ Plugin). I update some client info (GUI) depending on witch data is been displayed in the views. To do this I need to fetch some data from the server side, (the FieldDa…

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