====================
What's New in 0.12.2
====================

.. currentmodule:: openmc

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Summary
-------

This release of OpenMC is primarily a hotfix release with numerous important bug
fixes. Several tally-related enhancements have also been added.

------------
New Features
------------

Three tally-related enhancements were added to the code in this release:

- A new :class:`~openmc.CollisionFilter` class that allows tallies to be filtered
  by the number of collisions a particle has undergone.
- A `translation` attribute has been added to :class:`~openmc.MeshFilter` that
  allows a mesh to be translated from its original position before location
  checks are performed.
- The :class:`~openmc.UnstructuredMesh` class now supports libMesh unstructured
  meshes to enable better ingration with MOOSE-based applications.

---------
Bug Fixes
---------

- `Reset particle coordinates during find cell operation <https://github.com/openmc-dev/openmc/pull/1809>`_
- `Cover quadric edge case <https://github.com/openmc-dev/openmc/pull/1812>`_
- `Prevent divide-by-zero in bins_crossed methods for meshes <https://github.com/openmc-dev/openmc/pull/1816>`_
- `Fix for translational periodic boundary conditions <https://github.com/openmc-dev/openmc/pull/1820>`_
- `Fix angle sampling in CorrelatedAngleEnergy <https://github.com/openmc-dev/openmc/pull/1821>`_
- `Fix typo in fmt string for a lattice error <https://github.com/openmc-dev/openmc/pull/1824>`_
- `Nu-fission tally and stochastic volume bug fixes <https://github.com/openmc-dev/openmc/pull/1828>`_
- `Make sure failed neighbor list triggers exhaustic search <https://github.com/openmc-dev/openmc/pull/1830>`_
- `Change element to element.title to catch lowercase entries <https://github.com/openmc-dev/openmc/pull/1839>`_
- `Disallow non-current scores with a surface filter <https://github.com/openmc-dev/openmc/pull/1844>`_
- `Depletion operator obeys Materials.cross_sections <https://github.com/openmc-dev/openmc/pull/1846>`_
- `Fix for surface_bins_crossed override <https://github.com/openmc-dev/openmc/pull/1847>`_

------------
Contributors
------------

This release contains new contributions from the following people:

- `Hunter Belanger <https://github.com/HunterBelanger>`_
- `Isaac Griswold-Steiner <https://github.com/isaac-gs>`_
- `Andrew Johnson <https://github.com/drewejohnson>`_
- `Gavin Ridley <https://github.com/gridley>`_
- `Paul Romano <https://github.com/paulromano>`_
- `Patrick Shriwise <https://github.com/pshriwise>`_
- `Jonathan Shimwell <https://github.com/Shimwell>`_