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## Version 3.1.5 (March 28, 2022)
Patch release with miscellaneous bug/doc/build fixes.
In particular, this fixes an issue that could lead to incorrect values
for `numeric_limits<half>`. This also updates the CI workflow matrix
to VFX-CY2022.
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## Version 3.1.4 (January 21, 2022)
Patch release with miscellaneous bug/doc/build fixes.
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All checksums have been double-checked against existing RMD160 and
SHA512 hashes
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## Version 3.1.3 (September 2, 2021)
Patch release with miscellaneous fixes
* Fix undefined access of a vector when empty
* Require sphinx 4.0.3
* Build sphinx/doxygen docs with CMake
* Use PYIMATH_OVERRIDE_PYTHON_INSTALL_DIR to specify destination python modules
* Guard `__has_attribute` for compilers that don't support it
* Cuda safety fixes
* Replace stray Imath:: with IMATH_INTERNAL_NAMESPACE::
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## Version 3.1.2 (July 31, 2021)
Patch release that fixes a Windows header issue.
* Improve handling of ``#include <*intrin.h>``
## Version 3.1.1 (July 20, 2021)
Patch release that fixes a build failure on ARM64 macOS
## Version 3.1.0 (July 13, 2021)
Minor release with new features:
* Optimized half-to-float and float-to-half conversion, using F16C SSE
instruction set if available. Non-SSE conversion eliminates the
float-to-half exponent lookup table, and half-to-float conversion
provides a compile-time-optional bit shifting that is slower but
eliminates the need for the lookup table, for applications where
memory is limited.
Half-to-float and float-to-half conversion is also available as
C-language functions ``imath_half_to_float()`` and
``imath_float_to_half()``.
All new conversions produced identical results, and new options are
off by default to ensure backwards compatibility. See
https://imath.readthedocs.io for more info.
* NOEXCEPT specifier can be eliminated at compile-time via the
``IMATH_USE_NOEXCEPT`` CMake option.
* Python bindings:
* FixedArray objects support a "read only" state.
* FixedArray objects support python buffer protocol.
* Optimized 4x4 matrix multiplication.
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Imath is a basic, light-weight, and efficient C++ representation of 2D
and 3D vectors and matrices and other simple but useful mathematical
objects, functions, and data types common in computer graphics
applications.
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