# Paraview Catalyst adapter example for particle data

**URL:** https://discourse.paraview.org/t/paraview-catalyst-adapter-example-for-particle-data/13187
**Category:** ParaView Support
**Tags:** catalyst
**Created:** [November 3, 2023, 11:35pm UTC](https://discourse.paraview.org/t/paraview-catalyst-adapter-example-for-particle-data/13187 "2023-11-03T23:35:21Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![abhinavsns](https://discourse.paraview.org/user_avatar/discourse.paraview.org/abhinavsns/32/10946_2.png) [@abhinavsns](https://discourse.paraview.org/u/abhinavsns)
#### Post date: [November 3, 2023, 11:35pm UTC](https://discourse.paraview.org/t/paraview-catalyst-adapter-example-for-particle-data/13187/1 "2023-11-03T23:35:21Z")

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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](https://www.paraview.org/Wiki/Particle_simulations)

Is there an example that explains how to do this with catalyst adapter without setting the mesh info?  
Thank you!

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### Author: ![jfavre](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/j/b5ac83/32.png) [@jfavre](https://discourse.paraview.org/u/jfavre)
#### Post date: [November 5, 2023, 4:56pm UTC](https://discourse.paraview.org/t/paraview-catalyst-adapter-example-for-particle-data/13187/2 "2023-11-05T16:56:11Z")

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At the moment, you are forced to define an explicit list of indices for an unstructured grid made of one VTK\_POLY\_VERTEX cell, or N VTK\_VERTEX cells for N particles. However, a discussion is currently taking place to support Conduit’s implicit topologies. [https://gitlab.kitware.com/vtk/vtk/-/merge\_requests/10654](https://gitlab.kitware.com/vtk/vtk/-/merge_requests/10654)