yt 2.5 released!
@ John ZuHone | Saturday, Mar 2, 2013 | 2 minute read | Update at Thursday, Dec 3, 2020

Announcing yt 2.5!

yt 2.5 released!

We’re proud to announce the release of version 2.5 of the yt Project, The new version includes many new features, refinements of existing features, and numerous bugfixes. We encourage all users to upgrade to take advantage of the changes.

yt is a community-developed analysis and visualization toolkit, primarily directed at astrophysical hydrodynamics simulations. It provides full support for output from the Enzo, FLASH, Orion, and Nyx codes, with preliminary support for several others. It provides access to simulation data using an intuitive python interface, can perform many common visualization tasks, and offers a framework for conducting data reductions and analysis of simulation data.

The most visible changes with the 2.5 release include:

  • Testing has been greatly expanded, including unit tests and answer testing.
  • The capabilities of the Stream frontend have been expanded. Uniform grid and AMR-based data can be read into memory, and particle fields can be initialized.
  • The install script now provides for the optional installation of SciPy and the Rockstar halo finder.
  • Surfaces can now be extracted and examined, as well as uploaded to for interactive visualization in a web browser.
  • Support for the Athena code has been added.
  • Many, many improvements to PlotWindow.
  • Coordinate transformations have been sped up and streamlined, as well as cylindrical and spherical fields.
  • Increased support for the IPython notebook.
  • Improved support for FLASH particle fields.
  • The volume rendering backend has been updated to use an alpha channel, fixing parallel opaque volume renderings.
  • The AMRKDTree has been rewritten, allowing parallelism with other than power-of-2 MPI processes, arbitrary sets of grids, and splitting of unigrids.

For a complete list of changes in this release, please visit the Changelog (

Information about the yt project, including installation instructions, can be found on the homepage:

Development of yt has been sponsored by the NSF, the DOE, and various universities. We develop yt in the open and encourage contributions from users who extend and improve the code. We invite you to get involved with developing and using yt!

yt extension modules

yt has many extension packages to help you in your scientific workflow! Check these out, or create your own.


ytini is set of tools and tutorials for using yt as a tool inside the 3D visual effects software Houdini or a data pre-processor externally to Houdini.


Trident is a full-featured tool that projects arbitrary sightlines through astrophysical hydrodynamics simulations for generating mock spectral observations of the IGM and CGM.


pyXSIM is a Python package for simulating X-ray observations from astrophysical sources.


Analyze merger tree data from multiple sources. It’s yt for merger trees!


yt_idv is a package for interactive volume rendering with yt! It provides interactive visualization using OpenGL for datasets loaded in yt. It is written to provide both scripting and interactive access.


widgyts is a jupyter widgets extension for yt, backed by rust/webassembly to allow for browser-based, interactive exploration of data from yt.


yt_astro_analysis is the yt extension package for astrophysical analysis.

Make your own!!

Finally, check out our development docs on writing your own yt extensions!

Contributing to the Blog

Are you interested in contributing to the yt blog?

Check out our post on contributing to the blog for a guide!

We welcome contributions from all members of the yt community. Feel free to reach out if you need any help.

the yt data hub

The yt hub at has a ton of resources to check out, whether you have yt installed or not.

The collections host all sorts of data that can be loaded with yt. Some have been used in publications, and others are used as sample frontend data for yt. Maybe there’s data from your simulation software?

The rafts host the yt quickstart notebooks, where you can interact with yt in the browser, without needing to install it locally. Check out some of the other rafts too, like the widgyts release notebooks – a demo of the widgyts yt extension pacakge; or the notebooks from the CCA workshop – a user’s workshop on using yt.

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