# Development

**URL:** https://discourse.paraview.org/c/development/6.md?no_subcategories=false&page=29

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**Page:** 30

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## [Instantiating a lot of quads for an unstructured grid](https://discourse.paraview.org/t/instantiating-a-lot-of-quads-for-an-unstructured-grid/3368)

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**Author:** [@vbuck](https://discourse.paraview.org/u/vbuck)\
**Replies:** 0\
**Last updated:** [January 20, 2020, 8:59am UTC](https://discourse.paraview.org/t/instantiating-a-lot-of-quads-for-an-unstructured-grid/3368 "2020-01-20T08:59:19Z")

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Hi everyone! For a plugin I am trying to write, I need to create a surface consisting of about 300k quads. These quads are regularly spaced on the x & y axes, but have varying z levels. The surface is also not rectangu…

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## [Error in ParaView 5.7.0 when compiling with gcc 4.9.4 lots of error: no type named ‘ValueType’ in ‘auto’](https://discourse.paraview.org/t/error-in-paraview-5-7-0-when-compiling-with-gcc-4-9-4-lots-of-error-no-type-named-valuetype-in-auto/3366)

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**Author:** [@chart3388](https://discourse.paraview.org/u/chart3388)\
**Replies:** 4\
**Last updated:** [January 19, 2020, 6:15pm UTC](https://discourse.paraview.org/t/error-in-paraview-5-7-0-when-compiling-with-gcc-4-9-4-lots-of-error-no-type-named-valuetype-in-auto/3366 "2020-01-19T18:15:08Z")

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Building ParaView with the latest superbuild on commit dbfee3f64e9b64e126a2df217f0156381251aa3b with gcc-4.9.4 I get lots of repeated errors in the form of error: no type named ‘ValueType’ in ‘auto’ and of: \<l…

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## [Error in ParaView 5.8.0-RC1 ParallelDIY2 Filter file vtkGenerateGlobalIds.cxx when compiled with gcc 4.8.5 on RHEL 7.7](https://discourse.paraview.org/t/error-in-paraview-5-8-0-rc1-paralleldiy2-filter-file-vtkgenerateglobalids-cxx-when-compiled-with-gcc-4-8-5-on-rhel-7-7/3356)

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**Author:** [@joeh](https://discourse.paraview.org/u/joeh)\
**Replies:** 4\
**Last updated:** [January 17, 2020, 6:08pm UTC](https://discourse.paraview.org/t/error-in-paraview-5-8-0-rc1-paralleldiy2-filter-file-vtkgenerateglobalids-cxx-when-compiled-with-gcc-4-8-5-on-rhel-7-7/3356 "2020-01-17T18:08:12Z")

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Hello, I have found another error in ParaView 5.8.0-RC1 in the ParallelDIY2 Filter file vtkGenerateGlobalIds.cxx when compiled with gcc 4.8.5 on RHEL 7.7. Here is the error \[ 72%\] Generating client\_server wrapper sour…

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## [Error in ParaView 5.8.0-RC1 Extraction Filter file vtkValueSelector.cxx when compiled with gcc 4.8.5 on RHEL 7.7](https://discourse.paraview.org/t/error-in-paraview-5-8-0-rc1-extraction-filter-file-vtkvalueselector-cxx-when-compiled-with-gcc-4-8-5-on-rhel-7-7/3354)

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**Author:** [@joeh](https://discourse.paraview.org/u/joeh)\
**Replies:** 1\
**Last updated:** [January 16, 2020, 6:42pm UTC](https://discourse.paraview.org/t/error-in-paraview-5-8-0-rc1-extraction-filter-file-vtkvalueselector-cxx-when-compiled-with-gcc-4-8-5-on-rhel-7-7/3354 "2020-01-16T18:42:53Z")

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Hello, I have found another error when compiling ParaView 5.8.0-RC1 with gcc 4.8.5 on RHEL 7.7 gcc --version gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39) The error is here /home/joeh/PV/Build\_5.8.0-RC1\_mesa/superbuil…

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## [Error from vtkm in ArrayPortalToIterators.h when building with ParaView superbuild for ParaView 5.8.0-RC1](https://discourse.paraview.org/t/error-from-vtkm-in-arrayportaltoiterators-h-when-building-with-paraview-superbuild-for-paraview-5-8-0-rc1/3345)

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**Author:** [@joeh](https://discourse.paraview.org/u/joeh)\
**Replies:** 7\
**Last updated:** [January 16, 2020, 2:00pm UTC](https://discourse.paraview.org/t/error-from-vtkm-in-arrayportaltoiterators-h-when-building-with-paraview-superbuild-for-paraview-5-8-0-rc1/3345 "2020-01-16T14:00:20Z")

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Hello, I am getting the following errors from vtkm when building ParaView superbuild for ParaView 5.8.0-RC1 with gcc 4.8.5 on RHEL 7.7. There seems to have been an attempt to fix this error in ArrayPortalToIterators.…

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## [Custom Reader for vtkImageData - cells load but aren't shown](https://discourse.paraview.org/t/custom-reader-for-vtkimagedata-cells-load-but-arent-shown/3327)

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**Author:** [@vbuck](https://discourse.paraview.org/u/vbuck)\
**Replies:** 10\
**Last updated:** [January 15, 2020, 10:25am UTC](https://discourse.paraview.org/t/custom-reader-for-vtkimagedata-cells-load-but-arent-shown/3327 "2020-01-15T10:25:57Z")

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Hi everyone, I am currently trying to load a custom data format through a python plugin. An external python module returns a 2D numpy array, which I want to process further in Paraview. I initialized the plugin with V…

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## [ParaView 5.7 doesn't work scipy internal python module](https://discourse.paraview.org/t/paraview-5-7-doesnt-work-scipy-internal-python-module/3267)

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**Author:** [@MBG](https://discourse.paraview.org/u/MBG)\
**Replies:** 13\
**Last updated:** [January 14, 2020, 3:26pm UTC](https://discourse.paraview.org/t/paraview-5-7-doesnt-work-scipy-internal-python-module/3267 "2020-01-14T15:26:20Z")

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MacOS ParaView 5.6.2 \>\>\> from scipy.spatial import cKDTree \>\>\> MacOS ParaView 5.7 from scipy.spatial import cKDTree Traceback (most recent call last): File "\<console\>", line 1, in \<module\> File "/Applications/Par…

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## [vtkPoints not instantiable in plugin](https://discourse.paraview.org/t/vtkpoints-not-instantiable-in-plugin/3329)

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**Author:** [@vbuck](https://discourse.paraview.org/u/vbuck)\
**Replies:** 3\
**Last updated:** [January 14, 2020, 1:19pm UTC](https://discourse.paraview.org/t/vtkpoints-not-instantiable-in-plugin/3329 "2020-01-14T13:19:35Z")

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Hi everyone, I tried to write a python reader plugin that would create a set of points in space. However, when I try to import vtkPoints and instantiate it from vtk import vtkPoints, vtkCellArray points = vtkPoints() …

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## [Looking Glass Plugin](https://discourse.paraview.org/t/looking-glass-plugin/3333)

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**Author:** [@DrMarcHolmes](https://discourse.paraview.org/u/DrMarcHolmes)\
**Replies:** 1\
**Last updated:** [January 14, 2020, 9:10am UTC](https://discourse.paraview.org/t/looking-glass-plugin/3333 "2020-01-14T09:10:44Z")

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I would like to make a plugin for the Looking Glass its works by rendering out a light field based on 45 horizontal views. I searched and couldn’t find a plugin for paraview as yet. I think I could create a 45 views in…

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## [Parallel rendering - better partition](https://discourse.paraview.org/t/parallel-rendering-better-partition/3254)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 4\
**Last updated:** [January 12, 2020, 12:16pm UTC](https://discourse.paraview.org/t/parallel-rendering-better-partition/3254 "2020-01-12T12:16:04Z")

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Dear Experts, i have large number of independent mesh files, and want to use parallel rendering to improve performance. But i am not sure how to do data partition will result better rendering performance: The first ti…

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## [Catalyst Editions and 5.8](https://discourse.paraview.org/t/catalyst-editions-and-5-8/3166)

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**Author:** [@utkarsh.ayachit](https://discourse.paraview.org/u/utkarsh.ayachit)\
**Replies:** 11\
**Last updated:** [January 11, 2020, 2:24am UTC](https://discourse.paraview.org/t/catalyst-editions-and-5-8/3166 "2020-01-11T02:24:22Z")

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We dropped support for Catalyst editions with the CMake modularization changes introduced in ParaView 5.7 with intention that we’ll add support for a more robust, maintainable, and easy-to-use mechanism with similar goal…

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## [Python bindings for custom PV widgets](https://discourse.paraview.org/t/python-bindings-for-custom-pv-widgets/2921)

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**Author:** [@siver](https://discourse.paraview.org/u/siver)\
**Replies:** 8\
**Last updated:** [January 10, 2020, 9:31am UTC](https://discourse.paraview.org/t/python-bindings-for-custom-pv-widgets/2921 "2020-01-10T09:31:07Z")

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Dear PV devs, I hope you could assist with the following challenge: We have conjured a small xml/C++ plugin with custom QT widgets and not all of them are represented in the XML file. Now we would like to manipulate th…

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## [Paraview 5.7 with Python 3.7 on Windows 10 crashes when trying to use CellSize filter](https://discourse.paraview.org/t/paraview-5-7-with-python-3-7-on-windows-10-crashes-when-trying-to-use-cellsize-filter/3282)

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**Author:** [@heike](https://discourse.paraview.org/u/heike)\
**Replies:** 4\
**Last updated:** [January 8, 2020, 10:01pm UTC](https://discourse.paraview.org/t/paraview-5-7-with-python-3-7-on-windows-10-crashes-when-trying-to-use-cellsize-filter/3282 "2020-01-08T22:01:07Z")

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I am trying to apply a CellSize filter in Paraview 3.7 for windows, but Paraview crashes when I select the filter from the menu. I’ve turned on logging by using the -l flag and the last line in the log file is: ( 16.78…

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## [Filters switching current attribute of render view](https://discourse.paraview.org/t/filters-switching-current-attribute-of-render-view/3261)

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**Author:** [@cobo](https://discourse.paraview.org/u/cobo)\
**Replies:** 4\
**Last updated:** [January 8, 2020, 1:20pm UTC](https://discourse.paraview.org/t/filters-switching-current-attribute-of-render-view/3261 "2020-01-08T13:20:46Z")

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Let’s take the “Calculator” filter as an example: after entering a result attribute name and a formula and pressing Apply - not only the formula is evaluated! On top of that, the render view switches to showing the new …

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## [Question about design of SMProxy/SIProxy in paraview](https://discourse.paraview.org/t/question-about-design-of-smproxy-siproxy-in-paraview/3271)

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**Author:** [@lainegates](https://discourse.paraview.org/u/lainegates)\
**Replies:** 6\
**Last updated:** [January 8, 2020, 2:29am UTC](https://discourse.paraview.org/t/question-about-design-of-smproxy-siproxy-in-paraview/3271 "2020-01-08T02:29:04Z")

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Hi, guys. I want to develop a software based on paraview. I tried to understand mechanism of paraview and read code of paraview. It is so complex that I cannot get the key yet. I think the key design of paraview is SM…

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## [Can vtkDataArraySelection be used with custom plug-in filter that is based on the VTKPythonAlgorithmBase approach?](https://discourse.paraview.org/t/can-vtkdataarrayselection-be-used-with-custom-plug-in-filter-that-is-based-on-the-vtkpythonalgorithmbase-approach/2509)

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**Author:** [@vchan1186](https://discourse.paraview.org/u/vchan1186)\
**Replies:** 18\
**Last updated:** [January 7, 2020, 9:30am UTC](https://discourse.paraview.org/t/can-vtkdataarrayselection-be-used-with-custom-plug-in-filter-that-is-based-on-the-vtkpythonalgorithmbase-approach/2509 "2020-01-07T09:30:44Z")

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I am trying to write a ParaView Python custom plug-in filter that appends to data in the ParaView pipeline with data that is read in from a file. Since files can have multiple datasets, I am hoping to allow users to sele…

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## [Help on Performance Analysis for Paraview](https://discourse.paraview.org/t/help-on-performance-analysis-for-paraview/3249)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 2\
**Last updated:** [January 7, 2020, 4:10am UTC](https://discourse.paraview.org/t/help-on-performance-analysis-for-paraview/3249 "2020-01-07T04:10:29Z")

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Dear Experts, Could you please give me some suggestions on performance analysis for paraview?, especially on reader, mesh and render parts. I know from paraview’s menu “Tools”-\> “Time Log”, i can get some information a…

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## [How to render multiBlock Image data by Volume representation](https://discourse.paraview.org/t/how-to-render-multiblock-image-data-by-volume-representation/3238)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 5\
**Last updated:** [January 7, 2020, 4:07am UTC](https://discourse.paraview.org/t/how-to-render-multiblock-image-data-by-volume-representation/3238 "2020-01-07T04:07:48Z")

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Dear Experts, i found when i put several vtkImageData into vtkMultiBlockDataSet, i cannot select “Volume” representation. It seems the output data type is “vtkMultiBlockDataSet” not “vtkImageData”, so in the paraview r…

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## [Show Text on render view](https://discourse.paraview.org/t/show-text-on-render-view/3230)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 2\
**Last updated:** [January 7, 2020, 3:05am UTC](https://discourse.paraview.org/t/show-text-on-render-view/3230 "2020-01-07T03:05:07Z")

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Dear Experts, I want to show some information on render view, when user have some actions this text can be update accordingly in background, and i don’t want user to see the text neither in pipeline browser or property …

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## [MacOS ParaView 5.7 crashes on python plugin data sources](https://discourse.paraview.org/t/macos-paraview-5-7-crashes-on-python-plugin-data-sources/3263)

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**Author:** [@MBG](https://discourse.paraview.org/u/MBG)\
**Replies:** 7\
**Last updated:** [January 6, 2020, 12:33pm UTC](https://discourse.paraview.org/t/macos-paraview-5-7-crashes-on-python-plugin-data-sources/3263 "2020-01-06T12:33:04Z")

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I have a set of Python plugin data sources which works great separately. When two different data sources created MacOS ParaView crashes sometimes. Here is the plugin code: https://github.com/mobigroup/ParaView-plugins/bl…

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## [importing logging in a custom filter](https://discourse.paraview.org/t/importing-logging-in-a-custom-filter/3246)

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**Author:** [@majo\_vlas](https://discourse.paraview.org/u/majo_vlas)\
**Replies:** 1\
**Last updated:** [January 6, 2020, 11:02am UTC](https://discourse.paraview.org/t/importing-logging-in-a-custom-filter/3246 "2020-01-06T11:02:54Z")

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I have a custom filter and I have been trying to add logging, but can’t make it work, Paraview GUI keeps crashing and I have no idea why. I have tried something like import vtk import math import numpy as np import num…

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## [MacOS ParaView 5.6.2 python plugin issue](https://discourse.paraview.org/t/macos-paraview-5-6-2-python-plugin-issue/3269)

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**Author:** [@MBG](https://discourse.paraview.org/u/MBG)\
**Replies:** 0\
**Last updated:** [January 6, 2020, 10:22am UTC](https://discourse.paraview.org/t/macos-paraview-5-6-2-python-plugin-issue/3269 "2020-01-06T10:22:16Z")

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See the upstream example python plugin here: https://gitlab.kitware.com/paraview/paraview/blob/master/Examples/Plugins/PythonAlgorithm/PythonAlgorithmExamples.py On ParaView 5.6.2 for PythonSuperquadricSource doesn’t w…

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## [Help on visualize large number of Point/Sphere with different colors for each point/sphere](https://discourse.paraview.org/t/help-on-visualize-large-number-of-point-sphere-with-different-colors-for-each-point-sphere/3214)

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**Author:** [@sharon](https://discourse.paraview.org/u/sharon)\
**Replies:** 10\
**Last updated:** [December 26, 2019, 11:59am UTC](https://discourse.paraview.org/t/help-on-visualize-large-number-of-point-sphere-with-different-colors-for-each-point-sphere/3214 "2019-12-26T11:59:21Z")

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Dear Experts, I have the requirement to visualize a large number of points/sphere with different color, Currently, i writing my own plugin and user multiBlockDataSet to store each sphere in polydata format, so i can c…

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## [Filter xml template](https://discourse.paraview.org/t/filter-xml-template/3220)

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**Author:** [@SimonFuet](https://discourse.paraview.org/u/SimonFuet)\
**Replies:** 4\
**Last updated:** [December 20, 2019, 1:01pm UTC](https://discourse.paraview.org/t/filter-xml-template/3220 "2019-12-20T13:01:24Z")

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Hi all, I’m creating a new filter along with its Paraview (xml) interface. In this filter I have a lot of parameters. A parameter is composed of 3 components: a boolean that specifies whether the parameter is given a…

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## [Interactive 3D widget, custom filter plugin and MPI](https://discourse.paraview.org/t/interactive-3d-widget-custom-filter-plugin-and-mpi/3201)

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**Author:** [@Artem\_Bodrin](https://discourse.paraview.org/u/Artem_Bodrin)\
**Replies:** 10\
**Last updated:** [December 18, 2019, 9:15am UTC](https://discourse.paraview.org/t/interactive-3d-widget-custom-filter-plugin-and-mpi/3201 "2019-12-18T09:15:22Z")

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Good times to all of you, dear community! I have an idea to create a custom filter with a 3d widget. It will have 2 inputs: any surface (simple for start) and a pointset. The surface is a source for calculations, while…

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## [Bad interface while executing xdmf file](https://discourse.paraview.org/t/bad-interface-while-executing-xdmf-file/3170)

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**Author:** [@jksfisika84](https://discourse.paraview.org/u/jksfisika84)\
**Replies:** 1\
**Last updated:** [December 12, 2019, 10:30am UTC](https://discourse.paraview.org/t/bad-interface-while-executing-xdmf-file/3170 "2019-12-12T10:30:00Z")

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Hi All, I got this screen while I execute the xdmf file. I am using paraview 5.7.0. My coleague got the same problem (we use the same mark of laptop, DELL). Could anyone tell me what’s going on and how to fox it… Tha…

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## [ParaView older versions missing doc](https://discourse.paraview.org/t/paraview-older-versions-missing-doc/3125)

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**Author:** [@mwestphal](https://discourse.paraview.org/u/mwestphal)\
**Replies:** 1\
**Last updated:** [December 11, 2019, 1:08pm UTC](https://discourse.paraview.org/t/paraview-older-versions-missing-doc/3125 "2019-12-11T13:08:39Z")

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Looks like the older version of ParaView C++ doc is missing : https://kitware.github.io/paraview-docs/v5.6.1/cxx/ @cory.quammen @utkarsh.ayachit

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## [Can't compile two if the custom app examples](https://discourse.paraview.org/t/cant-compile-two-if-the-custom-app-examples/3160)

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**Author:** [@majo\_vlas](https://discourse.paraview.org/u/majo_vlas)\
**Replies:** 0\
**Last updated:** [December 10, 2019, 6:40pm UTC](https://discourse.paraview.org/t/cant-compile-two-if-the-custom-app-examples/3160 "2019-12-10T18:40:35Z")

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Have been trying to compile this apps https://gitlab.kitware.com/paraview/paraview/tree/master/Examples/CustomApplications and after lots of trial and error I finally did it except with two of them: Demo1 and Speadsheet …

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## [CityGML](https://discourse.paraview.org/t/citygml/3069)

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**Author:** [@christianLejon](https://discourse.paraview.org/u/christianLejon)\
**Replies:** 8\
**Last updated:** [December 4, 2019, 9:47am UTC](https://discourse.paraview.org/t/citygml/3069 "2019-12-04T09:47:03Z")

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I just downloaded the latest nightly build of Paraview (28 nov 2019). When I open CityGML files (Lod2) I cannot se them in Paraview. Under the information tab in the statistics box there is also NA written for the inform…

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## [Xdmf3 reader : blocks & finite element functions](https://discourse.paraview.org/t/xdmf3-reader-blocks-finite-element-functions/3103)

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**Author:** [@xgarnaud](https://discourse.paraview.org/u/xgarnaud)\
**Replies:** 0\
**Last updated:** [December 3, 2019, 8:38am UTC](https://discourse.paraview.org/t/xdmf3-reader-blocks-finite-element-functions/3103 "2019-12-03T08:38:35Z")

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Dear Paraview developpers, I’d like to use the xdmf format to store data in a 3d volume as wall as on the different boundaries, and I’d like to use the finite element function feature. Unlike for the Xdmf2 reader, th…

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