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paulromano merged 8 commits into from
Aug 5, 2026
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Release notes for 0.16.0 #4045

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ea8f430
Change 0.15.4 to 0.16.0
paulromano Aug 3, 2026
c311c33
Add release notes for 0.16.0. Update docstrings, etc.
paulromano Aug 3, 2026
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Make id_map_to_rgb private
paulromano Aug 4, 2026
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Add 4029 to notes
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Update docs/source/releasenotes/0.16.0.rst
paulromano Aug 5, 2026
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@paulromano
paulromano committed Aug 4, 2026
commit 208fbd64b74d855c374d0e5c808deb100035bbe4
105 changes: 53 additions & 52 deletions docs/source/releasenotes/0.16.0.rst
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Expand Up @@ -71,30 +71,18 @@ New Features
(`#3460 <https://github.com/openmc-dev/openmc/pull/3460>`_)
- Allowed :class:`~openmc.stats.CylindricalIndependent` to use an arbitrary
symmetry axis (`#3474 <https://github.com/openmc-dev/openmc/pull/3474>`_)
- Replaced the external ``vectfit`` dependency with an internal vector-fitting
implementation (`#3493 <https://github.com/openmc-dev/openmc/pull/3493>`_)
- Added :class:`SlicePlot` and :class:`VoxelPlot` in place of the legacy
:class:`Plot` interface
(`#3528 <https://github.com/openmc-dev/openmc/pull/3528>`_)
- Added angular probability-density evaluation for angle-energy distributions
(`#3550 <https://github.com/openmc-dev/openmc/pull/3550>`_)
- Generalized rotational periodic boundary conditions to the x-, y-, and
z-axes (`#3591 <https://github.com/openmc-dev/openmc/pull/3591>`_)
- Migrated internal sparse data structures to SciPy sparse arrays
(`#3613 <https://github.com/openmc-dev/openmc/pull/3613>`_)
- Added VTKHDF output support for unstructured meshes with hexahedral elements
(`#3623 <https://github.com/openmc-dev/openmc/pull/3623>`_)
- Added Python 3.14 support and raised the minimum supported Python version to
3.12 (`#3642 <https://github.com/openmc-dev/openmc/pull/3642>`_)
- Allowed nuclides, elements, density, temperature, and volume to be specified
in the :class:`Material` constructor
(`#3649 <https://github.com/openmc-dev/openmc/pull/3649>`_)
- Modernized and made relocatable the installed CMake package configuration
(`#3653 <https://github.com/openmc-dev/openmc/pull/3653>`_)
- Updated the documented minimum build environment to GCC 11.4 and CMake 3.22
(`#3666 <https://github.com/openmc-dev/openmc/pull/3666>`_)
- Improved automatic multigroup cross-section generation for random ray models
(`#3658 <https://github.com/openmc-dev/openmc/pull/3658>`_)
- Added overlap IDs to :meth:`Model.id_map`
(`#3669 <https://github.com/openmc-dev/openmc/pull/3669>`_)
- Added a command-line option for controlling output verbosity
Expand All @@ -113,9 +101,6 @@ New Features
(`#3717 <https://github.com/openmc-dev/openmc/pull/3717>`_)
- Added distributed cell-density support to the random ray solver
(`#3720 <https://github.com/openmc-dev/openmc/pull/3720>`_)
- Accelerated reaction-rate lookup in
:class:`~openmc.deplete.FluxCollapseHelper`
(`#3724 <https://github.com/openmc-dev/openmc/pull/3724>`_)
- Added optional material bounding boxes to
:meth:`MeshBase.material_volumes`
(`#3731 <https://github.com/openmc-dev/openmc/pull/3731>`_)
Expand All @@ -127,8 +112,6 @@ New Features
(`#3742 <https://github.com/openmc-dev/openmc/pull/3742>`_)
- Added ``MeshBase.n_elements`` and common bounding-box properties to the mesh
protocol (`#3745 <https://github.com/openmc-dev/openmc/pull/3745>`_)
- Added warnings when undefined attributes are assigned to :class:`Settings`
(`#3746 <https://github.com/openmc-dev/openmc/pull/3746>`_)
- Added C API bindings for random ray execution and configuration
(`#3749 <https://github.com/openmc-dev/openmc/pull/3749>`_)
- Generalized :class:`ParticleType` using the PDG Monte Carlo numbering scheme
Expand All @@ -137,29 +120,17 @@ New Features
(`#3760 <https://github.com/openmc-dev/openmc/pull/3760>`_)
- Added truncated normal distributions
(`#3761 <https://github.com/openmc-dev/openmc/pull/3761>`_)
- Added approximate neutron velocities when multigroup inverse-velocity data is
unavailable (`#3766 <https://github.com/openmc-dev/openmc/pull/3766>`_)
- Parallelized scattering-matrix transposition for adjoint random ray solves
(`#3768 <https://github.com/openmc-dev/openmc/pull/3768>`_)
- Enabled tracklength tallies of microscopic cross sections in void materials
(`#3771 <https://github.com/openmc-dev/openmc/pull/3771>`_)
- Changed distributed-instance XML data to subelements to support very large
instance lists (`#3774 <https://github.com/openmc-dev/openmc/pull/3774>`_)
- Precomputed random ray source-update offsets for improved performance
(`#3775 <https://github.com/openmc-dev/openmc/pull/3775>`_)
- Allowed tally scores and filters to be supplied to the :class:`Tally`
constructor (`#3777 <https://github.com/openmc-dev/openmc/pull/3777>`_)
- Added support for mixture distributions to
:func:`~openmc.stats.combine_distributions`
(`#3784 <https://github.com/openmc-dev/openmc/pull/3784>`_)
- Added C API bindings for :class:`~openmc.lib.SolidRayTracePlot`
(`#3789 <https://github.com/openmc-dev/openmc/pull/3789>`_)
- Simplified :meth:`Model.convert_to_multigroup` setup for DAGMC models
(`#3801 <https://github.com/openmc-dev/openmc/pull/3801>`_)
- Added upper and lower interpolation bounds to multigroup cross-section data
(`#3803 <https://github.com/openmc-dev/openmc/pull/3803>`_)
- Replaced the ``xtensor`` and ``xtl`` dependencies with internal tensor and
view classes (`#3805 <https://github.com/openmc-dev/openmc/pull/3805>`_)
- Added a C API and :func:`openmc.lib.slice_data` interface for raster slice
plots (`#3806 <https://github.com/openmc-dev/openmc/pull/3806>`_)
- Added settings for loading property files and controlling surface-grazing
Expand All @@ -168,31 +139,22 @@ New Features
(`#3809 <https://github.com/openmc-dev/openmc/pull/3809>`_)
- Added S2 directional sampling to the random ray solver
(`#3811 <https://github.com/openmc-dev/openmc/pull/3811>`_)
- Extended ray-traced plot data for use by estimators
(`#3816 <https://github.com/openmc-dev/openmc/pull/3816>`_)
- Added :meth:`RegularMesh.get_indices_at_coords`
(`#3824 <https://github.com/openmc-dev/openmc/pull/3824>`_)
- Allowed :meth:`MeshBase.from_domain` to accept bounding boxes directly
(`#3828 <https://github.com/openmc-dev/openmc/pull/3828>`_)
- Parallelized external-source sampling and made rejection counters thread-safe
(`#3830 <https://github.com/openmc-dev/openmc/pull/3830>`_)
- Added hybrid-domain tallies to
:func:`~openmc.deplete.get_microxs_and_flux`
(`#3831 <https://github.com/openmc-dev/openmc/pull/3831>`_)
- Improved depletion performance for models with transfer rates
(`#3839 <https://github.com/openmc-dev/openmc/pull/3839>`_)
- Added a setting to disable atomic relaxation
(`#3855 <https://github.com/openmc-dev/openmc/pull/3855>`_)
- Added :func:`openmc.stats.fusion_neutron_spectrum`
(`#3862 <https://github.com/openmc-dev/openmc/pull/3862>`_)
- Added a shared secondary-particle bank for load balancing histories across
threads and MPI ranks (`#3863 <https://github.com/openmc-dev/openmc/pull/3863>`_)
- Added support for multiple meshes in R2S calculations
(`#3860 <https://github.com/openmc-dev/openmc/pull/3860>`_)
- Allowed :meth:`openmc.deplete.StepResult.get_material` to accept integer IDs
(`#3872 <https://github.com/openmc-dev/openmc/pull/3872>`_)
- Allowed sequences of group boundaries in :meth:`Model.convert_to_multigroup`
(`#3873 <https://github.com/openmc-dev/openmc/pull/3873>`_)
- Added a shared secondary-particle bank for load balancing histories across
threads and MPI ranks (`#3863
<https://github.com/openmc-dev/openmc/pull/3863>`_)
- Added :meth:`RectilinearMesh.get_indices_at_coords`
(`#3876 <https://github.com/openmc-dev/openmc/pull/3876>`_)
- Expanded DAGMC cell material, density, and temperature overrides
Expand All @@ -201,8 +163,6 @@ New Features
(`#3903 <https://github.com/openmc-dev/openmc/pull/3903>`_)
- Added optional substeps to CRAM depletion solves
(`#3908 <https://github.com/openmc-dev/openmc/pull/3908>`_)
- Added per-cubic-meter units to material activity and decay-heat methods
(`#3912 <https://github.com/openmc-dev/openmc/pull/3912>`_)
- Extended :attr:`RegularMesh.volumes` to one- and two-dimensional meshes
(`#3914 <https://github.com/openmc-dev/openmc/pull/3914>`_)
- Enabled the tracklength estimator for neutron-heating tallies
Expand All @@ -211,8 +171,6 @@ New Features
(`#3919 <https://github.com/openmc-dev/openmc/pull/3919>`_)
- Added :class:`openmc.stats.DecaySpectrum` and integrated it with R2S
workflows (`#3930 <https://github.com/openmc-dev/openmc/pull/3930>`_)
- Allowed ``openmc.data.endf.Material`` objects in nuclear-data ``from_endf``
methods (`#3932 <https://github.com/openmc-dev/openmc/pull/3932>`_)
- Enabled pulse-height tallies in coupled neutron--photon calculations
(`#3937 <https://github.com/openmc-dev/openmc/pull/3937>`_)
- Added a description attribute to :class:`Model`
Expand All @@ -230,19 +188,12 @@ New Features
(`#3999 <https://github.com/openmc-dev/openmc/pull/3999>`_)
- Enabled parent-nuclide tally breakdowns in R2S calculations
(`#4013 <https://github.com/openmc-dev/openmc/pull/4013>`_)
- Added partial-current labels for :class:`MeshSurfaceFilter`
(`#4021 <https://github.com/openmc-dev/openmc/pull/4021>`_)
- Added control over NJOY's damage-energy threshold
(`#4022 <https://github.com/openmc-dev/openmc/pull/4022>`_)
- Optimized depletion-chain loading and material activity calculations
(`#4025 <https://github.com/openmc-dev/openmc/pull/4025>`_)
- Added a length multiplier to :class:`DAGMCUniverse`
(`#4033 <https://github.com/openmc-dev/openmc/pull/4033>`_)
- Added elemental photon mass energy-absorption coefficients
(`#4039 <https://github.com/openmc-dev/openmc/pull/4039>`_)
- Processed photon-induced electrons and positrons at their birth location and
attributed their heating to the parent photon
(`#4040 <https://github.com/openmc-dev/openmc/pull/4040>`_)

---------------------------
Bug Fixes and Small Changes
Expand All @@ -251,12 +202,24 @@ Bug Fixes and Small Changes
- Corrected type handling and generalized
:func:`~openmc.stats.combine_distributions`
(`#3445 <https://github.com/openmc-dev/openmc/pull/3445>`_)
- Replaced the external ``vectfit`` dependency with an internal vector-fitting
implementation (`#3493 <https://github.com/openmc-dev/openmc/pull/3493>`_)
- Normalized random ray eigenvalue fluxes consistently with Monte Carlo tallies
(`#3595 <https://github.com/openmc-dev/openmc/pull/3595>`_)
- Migrated internal sparse data structures to SciPy sparse arrays
(`#3613 <https://github.com/openmc-dev/openmc/pull/3613>`_)
- Added Python 3.14 support and raised the minimum supported Python version to
3.12 (`#3642 <https://github.com/openmc-dev/openmc/pull/3642>`_)
- Modernized and made relocatable the installed CMake package configuration
(`#3653 <https://github.com/openmc-dev/openmc/pull/3653>`_)
- Restored the DAGMC universe name when exporting XML
(`#3657 <https://github.com/openmc-dev/openmc/pull/3657>`_)
- Improved automatic multigroup cross-section generation for random ray models
(`#3658 <https://github.com/openmc-dev/openmc/pull/3658>`_)
- Corrected temperature assignment in :func:`openmc.model.borated_water`
(`#3662 <https://github.com/openmc-dev/openmc/pull/3662>`_)
- Updated the documented minimum build environment to GCC 11.4 and CMake 3.22
(`#3666 <https://github.com/openmc-dev/openmc/pull/3666>`_)
- Fixed :class:`DistribcellFilter` when applying tally results to a model
(`#3667 <https://github.com/openmc-dev/openmc/pull/3667>`_)
- Corrected source-location scaling in plots with non-centimeter axis units
Expand All @@ -279,36 +242,59 @@ Bug Fixes and Small Changes
(`#3708 <https://github.com/openmc-dev/openmc/pull/3708>`_)
- Corrected temperature-list handling in multigroup cross-section libraries
(`#3712 <https://github.com/openmc-dev/openmc/pull/3712>`_)
- Accelerated reaction-rate lookup in
:class:`~openmc.deplete.FluxCollapseHelper`
(`#3724 <https://github.com/openmc-dev/openmc/pull/3724>`_)
- Corrected operator precedence in nested CSG union and intersection
expressions (`#3730 <https://github.com/openmc-dev/openmc/pull/3730>`_)
- Preserved material names in depletion results
(`#3738 <https://github.com/openmc-dev/openmc/pull/3738>`_)
- Restored compatibility with pandas 3
(`#3743 <https://github.com/openmc-dev/openmc/pull/3743>`_)
- Added warnings when undefined attributes are assigned to :class:`Settings`
(`#3746 <https://github.com/openmc-dev/openmc/pull/3746>`_)
- Fixed plotting models that use multigroup cross sections
(`#3748 <https://github.com/openmc-dev/openmc/pull/3748>`_)
- Prevented unstable ground-state Ta180 from being added for natural tantalum
(`#3750 <https://github.com/openmc-dev/openmc/pull/3750>`_)
- Resolved conflicts between weight windows and global Russian roulette
(`#3751 <https://github.com/openmc-dev/openmc/pull/3751>`_)
- Added approximate neutron velocities when multigroup inverse-velocity data is
unavailable (`#3766 <https://github.com/openmc-dev/openmc/pull/3766>`_)
- Parallelized scattering-matrix transposition for adjoint random ray solves
(`#3768 <https://github.com/openmc-dev/openmc/pull/3768>`_)
- Removed a variable-length-array compiler extension
(`#3769 <https://github.com/openmc-dev/openmc/pull/3769>`_)
- Rejected nonpositive surface IDs
(`#3772 <https://github.com/openmc-dev/openmc/pull/3772>`_)
- Corrected length-multiplier use in libMesh methods
(`#3773 <https://github.com/openmc-dev/openmc/pull/3773>`_)
- Changed distributed-instance XML data to subelements to support very large
instance lists (`#3774 <https://github.com/openmc-dev/openmc/pull/3774>`_)
- Precomputed random ray source-update offsets for improved performance
(`#3775 <https://github.com/openmc-dev/openmc/pull/3775>`_)
- Improved radial crossing checks in cylindrical and spherical meshes
(`#3792 <https://github.com/openmc-dev/openmc/pull/3792>`_)
- Removed ``setuptools`` from runtime dependencies
(`#3794 <https://github.com/openmc-dev/openmc/pull/3794>`_)
- Simplified :meth:`Model.convert_to_multigroup` setup for DAGMC models
(`#3801 <https://github.com/openmc-dev/openmc/pull/3801>`_)
- Prevented ``None`` temperature values in automatically generated multigroup
data (`#3802 <https://github.com/openmc-dev/openmc/pull/3802>`_)
- Replaced the ``xtensor`` and ``xtl`` dependencies with internal tensor and
view classes (`#3805 <https://github.com/openmc-dev/openmc/pull/3805>`_)
- Enforced positive mesh radii in the Python API
(`#3813 <https://github.com/openmc-dev/openmc/pull/3813>`_)
- Extended ray-traced plot data for use by estimators
(`#3816 <https://github.com/openmc-dev/openmc/pull/3816>`_)
- Corrected :meth:`MeshFilter.get_pandas_dataframe` for non-regular meshes
(`#3817 <https://github.com/openmc-dev/openmc/pull/3817>`_)
- Corrected pulse-height scoring when no cell filter is present
(`#3821 <https://github.com/openmc-dev/openmc/pull/3821>`_)
- Parallelized external-source sampling and made rejection counters thread-safe
(`#3830 <https://github.com/openmc-dev/openmc/pull/3830>`_)
- Improved depletion performance for models with transfer rates
(`#3839 <https://github.com/openmc-dev/openmc/pull/3839>`_)
- Corrected surface-normal determination in solid ray-traced plots
(`#3846 <https://github.com/openmc-dev/openmc/pull/3846>`_)
- Corrected parsing of cell data in the Python API
Expand All @@ -317,6 +303,10 @@ Bug Fixes and Small Changes
at large pitch (`#3853 <https://github.com/openmc-dev/openmc/pull/3853>`_)
- Closed redirected standard-output file descriptors after use
(`#3864 <https://github.com/openmc-dev/openmc/pull/3864>`_)
- Allowed :meth:`openmc.deplete.StepResult.get_material` to accept integer IDs
(`#3872 <https://github.com/openmc-dev/openmc/pull/3872>`_)
- Allowed sequences of group boundaries in :meth:`Model.convert_to_multigroup`
(`#3873 <https://github.com/openmc-dev/openmc/pull/3873>`_)
- Clipped small negative atom densities produced by CRAM
(`#3879 <https://github.com/openmc-dev/openmc/pull/3879>`_)
- Corrected surface-source particle counts under MPI
Expand All @@ -325,6 +315,10 @@ Bug Fixes and Small Changes
(`#3907 <https://github.com/openmc-dev/openmc/pull/3907>`_)
- Fixed an MPI hang during depletion calculations
(`#3910 <https://github.com/openmc-dev/openmc/pull/3910>`_)
- Added per-cubic-meter units to material activity and decay-heat methods
(`#3912 <https://github.com/openmc-dev/openmc/pull/3912>`_)
- Allowed ``openmc.data.endf.Material`` objects in nuclear-data ``from_endf``
methods (`#3932 <https://github.com/openmc-dev/openmc/pull/3932>`_)
- Reevaluated geometry after close collisions that follow a surface crossing
(`#3933 <https://github.com/openmc-dev/openmc/pull/3933>`_)
- Corrected virtual-surface crossing behavior
Expand Down Expand Up @@ -375,10 +369,14 @@ Bug Fixes and Small Changes
(`#4019 <https://github.com/openmc-dev/openmc/pull/4019>`_)
- Avoided accessing atomic-relaxation maps when no relaxation data is present
(`#4020 <https://github.com/openmc-dev/openmc/pull/4020>`_)
- Added partial-current labels for :class:`MeshSurfaceFilter`
(`#4021 <https://github.com/openmc-dev/openmc/pull/4021>`_)
- Corrected ``M_PI`` availability on affected compilers
(`#4023 <https://github.com/openmc-dev/openmc/pull/4023>`_)
- Determined surface-source starting half-spaces from particle direction
(`#4024 <https://github.com/openmc-dev/openmc/pull/4024>`_)
- Optimized depletion-chain loading and material activity calculations
(`#4025 <https://github.com/openmc-dev/openmc/pull/4025>`_)
- Corrected sparse storage of multidimensional tally results
(`#4030 <https://github.com/openmc-dev/openmc/pull/4030>`_)
- Resolved relative input paths against the XML file that contains them
Expand All @@ -389,3 +387,6 @@ Bug Fixes and Small Changes
(`#4037 <https://github.com/openmc-dev/openmc/pull/4037>`_)
- Limited unstructured-mesh Exodus output to one MPI rank
(`#4038 <https://github.com/openmc-dev/openmc/pull/4038>`_)
- Processed photon-induced electrons and positrons at their birth location and
attributed their heating to the parent photon
(`#4040 <https://github.com/openmc-dev/openmc/pull/4040>`_)
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