This is an ABI-compatible update for the 2.4.x series that includes all fixes and enhancements since the 2.4.1 release.
With the 2.4.2 release, the "Preview" label is now removed from the ACES 2 implementation. After extensive collaboration with the ACES Output Transform working group, and our own testing, ACES 2 support in OCIO is now officially released. We will continue to closely monitor your feedback on this new tech.
A large part of the work since the 2.4.1 release was an attempt to optimize the ACES 2 algorithms. ACES 2 is still substantially slower than ACES 1 on CPU and somewhat slower on GPU. But the optimization efforts did yield a roughly 25% speedup over the 2.4.1 release, along with a simplification of the code. Special thanks to Kevin Wheatley and Remi Achard for leading this work.
In conjunction with the 2.4.2 release, the OCIO ACES configs working group has released the ACES 2.0 configs for OCIO. Special thanks to Thomas Mansencal for leading this work. The configs are not yet built into the library itself and may be downloaded from this link.
Bug fixes and enhancements:
PR #2127, ACES 2.0 Output Transform performance optimization
PR #2112, Absolute paths not working through ConfigIOProxy
PR #2128, Add missing setConfigIOProxy call to the Python API
PR #2117, Fix metal backend's generated shaders with float/int/constant array performance
PR #2121, Integrate matrix multiplication fix from OSL
PR #2120, Change recommended Imath version to 3.1.12
PR #2109, Fix issue with ocio_depts handling spaces in file paths
PR #2132, NaN fix for the ACES 2 inverse output transforms
Build, documentation, and website enhancements:
PR #2089, Add support for Windows ARM64
Many thanks to the following contributors:
@KevinJW, @remia, @KelSolaar, @num3ric, @alexfry, @scottdyer, @nick-shaw, @priikone, @Morteeza, @JGamache-autodesk, @mjtitchener-fn, @anthony-linaro, @DevTGHa, @zachlewis, @carolalynn, @cozdas, and @doug-walker
