# \#catalyst

**URL:** https://discourse.paraview.org/tag/catalyst/14.md

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

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## [render multiple views with single Catalyst Python script](https://discourse.paraview.org/t/render-multiple-views-with-single-catalyst-python-script/16891)

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**Author:** [@uturuncoglu](https://discourse.paraview.org/u/uturuncoglu)\
**Replies:** 2\
**Last updated:** [July 10, 2026, 2:43pm UTC](https://discourse.paraview.org/t/render-multiple-views-with-single-catalyst-python-script/16891 "2026-07-10T14:43:40Z")

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Hi, I wonder if there is a way to output all the render views with Catalyst. In my case, I have four panel but the Catalyst Python script is only processing the one of them. Of course, I could create four different scri…

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## [Can Catalyst stream simulation data to multiple independent pvserver ?](https://discourse.paraview.org/t/can-catalyst-stream-simulation-data-to-multiple-independent-pvserver/17471)

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**Author:** [@Ayyoub\_Boulahri](https://discourse.paraview.org/u/Ayyoub_Boulahri)\
**Replies:** 6\
**Last updated:** [March 12, 2026, 1:54pm UTC](https://discourse.paraview.org/t/can-catalyst-stream-simulation-data-to-multiple-independent-pvserver/17471 "2026-03-12T13:54:29Z")

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I am working on an in-situ visualization pipeline using AdiosReplay/Catalyst2 and ParaView. My setup involves a running simulation that streams data via ADIOS2/SST to AdiosReplay, which then uses Catalyst to forward the …

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## [pvpython script freezes in Jupyter](https://discourse.paraview.org/t/pvpython-script-freezes-in-jupyter/17350)

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**Author:** [@greg](https://discourse.paraview.org/u/greg)\
**Replies:** 0\
**Last updated:** [December 5, 2025, 2:01pm UTC](https://discourse.paraview.org/t/pvpython-script-freezes-in-jupyter/17350 "2025-12-05T14:01:53Z")

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I am trying to connect from Jupyter to a catalyst in situ simulation, but Jupyter freezes in the moment, when the in situ side connects. ( The aim of this experiment is to show some statistics, no graphics, in Jupyter fr…

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## [Catalyst connection freezes in Jupyter](https://discourse.paraview.org/t/catalyst-connection-freezes-in-jupyter/17342)

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**Author:** [@greg](https://discourse.paraview.org/u/greg)\
**Replies:** 0\
**Last updated:** [December 2, 2025, 8:36pm UTC](https://discourse.paraview.org/t/catalyst-connection-freezes-in-jupyter/17342 "2025-12-02T20:36:41Z")

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I am trying to connect from Jupyter to a catalyst in situ simulation, but Jupyter freezes in the moment, when the in situ side connects. ( The aim of this experiment is to show some statistics, no graphics, in Jupyter fr…

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## [Paraview Binaries for Mac with Catalyst](https://discourse.paraview.org/t/paraview-binaries-for-mac-with-catalyst/17253)

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**Author:** [@rs.mm](https://discourse.paraview.org/u/rs.mm)\
**Replies:** 5\
**Last updated:** [November 2, 2025, 10:42am UTC](https://discourse.paraview.org/t/paraview-binaries-for-mac-with-catalyst/17253 "2025-11-02T10:42:46Z")

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Quick question, Do the available precompiled versions of Paraview have Catalyst enabled? My In-Situ pipeline works on the Linux version but not for Mac(arm). So far, I have tried with 5.11, 5.12, 5.13 to no success.

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## [Expanding ParaView Catalyst Source Mechanism](https://discourse.paraview.org/t/expanding-paraview-catalyst-source-mechanism/17056)

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**Author:** [@Bob\_Obara](https://discourse.paraview.org/u/Bob_Obara)\
**Replies:** 7\
**Last updated:** [August 25, 2025, 9:15am UTC](https://discourse.paraview.org/t/expanding-paraview-catalyst-source-mechanism/17056 "2025-08-25T09:15:56Z")

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In the current implementation, it is difficult to extend how channels in a Catalyst Conduit tree get mapped to sources in ParaView pipelines. What I propose here is to make this process a bit more flexible and to allow P…

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## [Free Webinar - In Situ Analysis with Catalyst: Getting Started](https://discourse.paraview.org/t/free-webinar-in-situ-analysis-with-catalyst-getting-started/17034)

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**Author:** [@coreylee](https://discourse.paraview.org/u/coreylee)\
**Replies:** 0\
**Last updated:** [July 31, 2025, 7:51pm UTC](https://discourse.paraview.org/t/free-webinar-in-situ-analysis-with-catalyst-getting-started/17034 "2025-07-31T19:51:09Z")

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On August 6, 2025, from 12:00pm - 1:00pm EST, Kitware will be hosting a free live webinar, “In Situ Analysis with Catalyst: Getting Started”. The webinar will demonstrate how to integrate Catalyst into a simulation code …

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## [pvbatch: first screenshot empty, second is as it should be](https://discourse.paraview.org/t/pvbatch-first-screenshot-empty-second-is-as-it-should-be/16973)

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**Author:** [@Tox](https://discourse.paraview.org/u/Tox)\
**Replies:** 5\
**Last updated:** [July 31, 2025, 2:02pm UTC](https://discourse.paraview.org/t/pvbatch-first-screenshot-empty-second-is-as-it-should-be/16973 "2025-07-31T14:02:17Z")

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I am using Paraview 5.13.3 (on Windows 11) to generate a large number of plots with pvbatch. All work fine, except a limited set of plots. In the script, the first plots is empty (except for a color bar), the second is o…

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## [Webinar - Catalyst: The Swiss Army Knife for Smarter Simulations](https://discourse.paraview.org/t/webinar-catalyst-the-swiss-army-knife-for-smarter-simulations/16574)

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**Author:** [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)\
**Replies:** 0\
**Last updated:** [May 6, 2025, 3:44pm UTC](https://discourse.paraview.org/t/webinar-catalyst-the-swiss-army-knife-for-smarter-simulations/16574 "2025-05-06T15:44:03Z")

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On May 14, 2025, from 12:00pm - 1:00pm EST, Kitware will be hosting a free live webinar, “Catalyst: The Swiss Army Knife for Smarter Simulations”. The webinar will demonstrate how Catalyst can streamline your workflows, …

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## [Issue with actual rendering under Catalyst](https://discourse.paraview.org/t/issue-with-actual-rendering-under-catalyst/16271)

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**Author:** [@uturuncoglu](https://discourse.paraview.org/u/uturuncoglu)\
**Replies:** 7\
**Last updated:** [March 11, 2025, 3:41pm UTC](https://discourse.paraview.org/t/issue-with-actual-rendering-under-catalyst/16271 "2025-03-11T15:41:29Z")

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Hi, I am getting error like double free or corruption (fasttop) when I try to render a very simple image with ParaView Catalyst. The trace looks like following (sorry I did not compile paraview or catalyst in debug mode…

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## [Issues with Catalyst 2.0 Installation & Failing Tests (ctest)](https://discourse.paraview.org/t/issues-with-catalyst-2-0-installation-failing-tests-ctest/16107)

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**Author:** [@Bhavesh](https://discourse.paraview.org/u/Bhavesh)\
**Replies:** 20\
**Last updated:** [March 4, 2025, 10:36pm UTC](https://discourse.paraview.org/t/issues-with-catalyst-2-0-installation-failing-tests-ctest/16107 "2025-03-04T22:36:38Z")

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Hi everyone, I am trying to install Catalyst 2.0 and run ctest, but I am encountering multiple test failures. I have followed the official documentation: :link: Catalyst 2.0 Build & Install Guide System Information: O…

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## [CMake Error: Unknown Command c\_install\_targets When Configuring Catalyst2](https://discourse.paraview.org/t/cmake-error-unknown-command-c-install-targets-when-configuring-catalyst2/15773)

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**Author:** [@Bhavesh](https://discourse.paraview.org/u/Bhavesh)\
**Replies:** 2\
**Last updated:** [February 26, 2025, 7:35pm UTC](https://discourse.paraview.org/t/cmake-error-unknown-command-c-install-targets-when-configuring-catalyst2/15773 "2025-02-26T19:35:20Z")

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Hi everyone, I am trying to build Catalyst2 from the source code on a Windows 10 system using the following setup: CMake Version: 3.31.0 Paraview Version: 5.12.1 Generator: Ninja Compilers: GNU 14.1.0 Source Directory:…

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## [VTM writer used with Catalyst and large number of processes fails due to excessive memory usage](https://discourse.paraview.org/t/vtm-writer-used-with-catalyst-and-large-number-of-processes-fails-due-to-excessive-memory-usage/15629)

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**Author:** [@cmorsbach](https://discourse.paraview.org/u/cmorsbach)\
**Replies:** 0\
**Last updated:** [October 24, 2024, 1:57pm UTC](https://discourse.paraview.org/t/vtm-writer-used-with-catalyst-and-large-number-of-processes-fails-due-to-excessive-memory-usage/15629 "2024-10-24T13:57:08Z")

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Hi all, I’ve been running some strong scaling tests with our CFD code, which has in-situ functionality using ParaView Catalyst V1. The data, we pass to the co-processor is a vtkMultiBlockDataset where only one vtkUnstru…

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## [Incomplete paraview installation, missing catalystd.dll](https://discourse.paraview.org/t/incomplete-paraview-installation-missing-catalystd-dll/14635)

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**Author:** [@mandman](https://discourse.paraview.org/u/mandman)\
**Replies:** 0\
**Last updated:** [May 15, 2024, 1:33pm UTC](https://discourse.paraview.org/t/incomplete-paraview-installation-missing-catalystd-dll/14635 "2024-05-15T13:33:50Z")

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Since last two weeks I am trying to build Paraview 5.12 from source code with catalyst enabled for purpose of in-situ visualization. Before my laptop breakdown after numerous configurations, and builds I thought of seeki…

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## [Catalyst 2.0.0 is available for download](https://discourse.paraview.org/t/catalyst-2-0-0-is-available-for-download/14274)

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**Author:** [@coreylee](https://discourse.paraview.org/u/coreylee)\
**Replies:** 1\
**Last updated:** [April 4, 2024, 1:06pm UTC](https://discourse.paraview.org/t/catalyst-2-0-0-is-available-for-download/14274 "2024-04-04T13:06:06Z")

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The Catalyst team is pleased to announce that Catalyst 2.0.0 has been released and is available for download from Gitlab. Please see the release notes for details on new features in Catalyst 2.0.0. Thanks! The Cataly…

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## [cfp: Workshop on In Situ Visualization](https://discourse.paraview.org/t/cfp-workshop-on-in-situ-visualization/13760)

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**Author:** [@jameskress](https://discourse.paraview.org/u/jameskress)\
**Replies:** 1\
**Last updated:** [February 25, 2024, 1:16pm UTC](https://discourse.paraview.org/t/cfp-workshop-on-in-situ-visualization/13760 "2024-02-25T13:16:37Z")

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WOIV’24: 8th International Workshop on In Situ Visualization Held in conjunction with ISC 2024 Hamburg, Germany, May 16, 2024 Scope Large-scale HPC simulations with their inherent I/O bottleneck have made in situ visua…

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## [Questions about changing clip values](https://discourse.paraview.org/t/questions-about-changing-clip-values/13569)

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**Author:** [@Andrew\_Cook](https://discourse.paraview.org/u/Andrew_Cook)\
**Replies:** 0\
**Last updated:** [December 19, 2023, 9:34pm UTC](https://discourse.paraview.org/t/questions-about-changing-clip-values/13569 "2023-12-19T21:34:36Z")

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I have a windows 10 computer, using paraview 5.2.10, I downloaded paraview from the official site. I know that in paraview it is possible to script. I have had troubles doing this though with what I want. Specifically, …

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## [Catalyst: Finer grain control over execution](https://discourse.paraview.org/t/catalyst-finer-grain-control-over-execution/13475)

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**Author:** [@Christos\_Tsolakis](https://discourse.paraview.org/u/Christos_Tsolakis)\
**Replies:** 10\
**Last updated:** [December 14, 2023, 9:30pm UTC](https://discourse.paraview.org/t/catalyst-finer-grain-control-over-execution/13475 "2023-12-14T21:30:46Z")

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As it stands right now if a simulation calls catalyst\_execute data will be converted even if the extractors run at a frequency greater than one. Even though conduit blueprints are lightweight this could be costly depend…

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## [Catalyst2: Artifacts on Processes Boundaries](https://discourse.paraview.org/t/catalyst2-artifacts-on-processes-boundaries/13489)

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**Author:** [@cartagena](https://discourse.paraview.org/u/cartagena)\
**Replies:** 4\
**Last updated:** [December 14, 2023, 1:44pm UTC](https://discourse.paraview.org/t/catalyst2-artifacts-on-processes-boundaries/13489 "2023-12-14T13:44:45Z")

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I am trying to visualize a particle simulation with in-situ Catalyst2 support, and while it is correct on single core (produced image is consistent with what ParaView creates), in multi-core setting I am getting artifact…

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## [Catalyst2 and ascent](https://discourse.paraview.org/t/catalyst2-and-ascent/13223)

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**Author:** [@zetwal](https://discourse.paraview.org/u/zetwal)\
**Replies:** 11\
**Last updated:** [November 20, 2023, 7:17pm UTC](https://discourse.paraview.org/t/catalyst2-and-ascent/13223 "2023-11-20T19:17:49Z")

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Hello Is there an example of catayst2 working with an ascent backend?

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## [Create a channel for vtkMultiBlock](https://discourse.paraview.org/t/create-a-channel-for-vtkmultiblock/13264)

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**Author:** [@robertsawko](https://discourse.paraview.org/u/robertsawko)\
**Replies:** 3\
**Last updated:** [November 17, 2023, 11:33am UTC](https://discourse.paraview.org/t/create-a-channel-for-vtkmultiblock/13264 "2023-11-17T11:33:20Z")

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Hello, I am writing a Catalyst2 adapter for a particle-in-cell code. Catalyst has channels to pass different type of information. My original idea was to have a channel for mesh and for particle separately, but then I r…

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## [Catalyst2 and grouping output](https://discourse.paraview.org/t/catalyst2-and-grouping-output/13224)

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**Author:** [@zetwal](https://discourse.paraview.org/u/zetwal)\
**Replies:** 3\
**Last updated:** [November 10, 2023, 4:36pm UTC](https://discourse.paraview.org/t/catalyst2-and-grouping-output/13224 "2023-11-10T16:36:59Z")

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Hello I’m using the gridwriter.py sample script to write data out from Catalyst. The issue is as the number of ranks increases, the number of output files also goes up. Is there a way to group data from several ranks to…

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## [multimaterial data, NaNs and Catalyst V2](https://discourse.paraview.org/t/multimaterial-data-nans-and-catalyst-v2/13115)

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**Author:** [@zetwal](https://discourse.paraview.org/u/zetwal)\
**Replies:** 9\
**Last updated:** [November 7, 2023, 2:31pm UTC](https://discourse.paraview.org/t/multimaterial-data-nans-and-catalyst-v2/13115 "2023-11-07T14:31:34Z")

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Hello I have a simulation that has multiple materials. So, I’m thinking that the easiest way to handle this is to put NANs in the cells for which there is no data for that material. That seems to work, and the NAN cells…

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## [Paraview Catalyst adapter example for particle data](https://discourse.paraview.org/t/paraview-catalyst-adapter-example-for-particle-data/13187)

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**Author:** [@abhinavsns](https://discourse.paraview.org/u/abhinavsns)\
**Replies:** 1\
**Last updated:** [November 5, 2023, 4:56pm UTC](https://discourse.paraview.org/t/paraview-catalyst-adapter-example-for-particle-data/13187 "2023-11-05T16:56:11Z")

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Hello, I am trying to set up catalyst for my simulation where I only have particles without connectivity info. I usually write vtp files similar to: https://www.paraview.org/Wiki/Particle\_simulations Is there an exampl…

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## [Catalyst 2.0 Documentation Resources 📑](https://discourse.paraview.org/t/catalyst-2-0-documentation-resources/13142)

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**Author:** [@Christos\_Tsolakis](https://discourse.paraview.org/u/Christos_Tsolakis)\
**Replies:** 0\
**Last updated:** [October 30, 2023, 5:29pm UTC](https://discourse.paraview.org/t/catalyst-2-0-documentation-resources/13142 "2023-10-30T17:29:03Z")

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A number of new and updated documentation resources have been created or updated for Catalyst 2.0 and the ParaViewCatalyst implementation: Catalyst 2.0: Documentation about the base Catalyst library, the backbone of all…

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## [Catalyst 2: Add Fortran examples](https://discourse.paraview.org/t/catalyst-2-add-fortran-examples/7541)

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**Author:** [@gha3mi](https://discourse.paraview.org/u/gha3mi)\
**Replies:** 6\
**Last updated:** [August 17, 2023, 2:55pm UTC](https://discourse.paraview.org/t/catalyst-2-add-fortran-examples/7541 "2023-08-17T14:55:41Z")

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I would like to use Paraview Catalyst in my Fortran project. Could you give me an example or would you please help me prepare an example?

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## [Build Paraview-5.11.0 with Legacy Catalyst (v1)](https://discourse.paraview.org/t/build-paraview-5-11-0-with-legacy-catalyst-v1/11315)

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**Author:** [@m.novak](https://discourse.paraview.org/u/m.novak)\
**Replies:** 10\
**Last updated:** [February 6, 2023, 11:51am UTC](https://discourse.paraview.org/t/build-paraview-5-11-0-with-legacy-catalyst-v1/11315 "2023-02-06T11:51:34Z")

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Dear support. I am trying to build paraview-5.11.0 with the latest spack release. Is it possible to configure it in a way in which Legacy catalyst will get built? I checked release notes and in 5.9.0 it is stated lega…

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## [Connect to an already running simulation](https://discourse.paraview.org/t/connect-to-an-already-running-simulation/11207)

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**Author:** [@CsatiZoltan](https://discourse.paraview.org/u/CsatiZoltan)\
**Replies:** 1\
**Last updated:** [January 19, 2023, 2:04pm UTC](https://discourse.paraview.org/t/connect-to-an-already-running-simulation/11207 "2023-01-19T14:04:09Z")

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Imagine the following use case. Sets of ParaView servers and a massive simulation are launched as a job on multiple nodes of a cluster. It is not known in advance when the job scheduler allows the job to start running. …

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## [Error: Connection to simulation has been dropped](https://discourse.paraview.org/t/error-connection-to-simulation-has-been-dropped/10815)

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**Author:** [@zauser519](https://discourse.paraview.org/u/zauser519)\
**Replies:** 1\
**Last updated:** [November 21, 2022, 3:02pm UTC](https://discourse.paraview.org/t/error-connection-to-simulation-has-been-dropped/10815 "2022-11-21T15:02:16Z")

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Hi, I am a new in-situ visualization learner. So I try the basic Catalyst function, click connect under catalyst menu (to port 22222) However, whatever I create under catalyst, sphere for example, there’s always error …

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## [Non-uniform rectilinear grid isses](https://discourse.paraview.org/t/non-uniform-rectilinear-grid-isses/10722)

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**Author:** [@Preslav](https://discourse.paraview.org/u/Preslav)\
**Replies:** 1\
**Last updated:** [November 15, 2022, 4:22am UTC](https://discourse.paraview.org/t/non-uniform-rectilinear-grid-isses/10722 "2022-11-15T04:22:51Z")

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Hello, I am trying to render a non-uniform rectilinear grid with catalyst. The code I use to generate the grid is: mesh\["coordsets/coords/type"\] = "rectilinear"; mesh\["coordsets/coords/values/x"\] = grid.g\_x; …

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