MtoA is a plug-in for Autodesk Maya which provides a bridge to the Arnold rendering system from within the standard Maya interface.

Enhancements
Faster polymesh node init: Time needed for polymesh node initialization has been reduced when there are many meshes being initialized at the same time on machines with many CPU cores. For instance, the Activision Caldera scene went from 63s to initialize to 8.7s on a 120-core Windows machine. (ARNOLD-16008)

Parallel instancer initialization: Multiple instancer nodes can now initialize at the same time. On a 120-core Windows machine the scene init time for the Intel Jungle USD scene went from 115s to 43s. (ARNOLD-16120)

Minor Imager performance improvement: Enhanced memory copy operations within the Imager framework, resulting in improved performance. Stress tests demonstrate a reduction of 60 milliseconds per Imager chain. (ARNOLD-16256)

parallel_init metadata: A warning is now printed when the parallel_init metadata is missing from a procedural. Missing metdata results in parallel_init being disabled for the procedural, which can result in slower scene initialization for those procedurals that could have safely benefited from parallel initialization. (ARNOLD-7051)

Update Autodesk Desktop Licensing: Autodesk Desktop Licensing is updated to v15.3.0.1298. See the release notes for more information on this release. (ARNOLD-16104)

Upgrade OIIO components: Various components used by OpenImageIO have been upgraded to more recent versions. In particular, jpeg files should now load and write noticeably faster than before. (ARNOLD-7892, ARNOLD-15771)

Upgrade Customer Error Reporting (CER): CER was upgraded to 7.1.8 to address security vulnerabilities. (ARNOLD-16144)

Upgrade Autodesk Analytics Program: Arnold includes a newer version of the Autodesk Analytics Program (ADP), which brings stability and performance improvements. (ARNOLD-16031) 

Arnold 7.4.3.2 is a bug-fix release. For the full list of features in Arnold 7.4.3.0, see the Arnold 7.4.3.0 release notes.

Bug Fixes
ARNOLD-16506 – Cryptomatte filter was not reflecting interactive changes in the beauty filter
ARNOLD-16695 – MaterialX Color4 Image node throws error while rendering
ARNOLD-16713 – Support normalmap shaders from older versions of materialx
ARNOLD-16723 – Support materialx_types in AiMaterialxGetNodeEntryFromDefinition
ARNOLD-16761 – Crash when largest polymesh stats contains deleted mesh
ARNOLD-16770 – Scene bounding box is not updated for changes that reinitialize a geometry node
ARNOLD-16772 – Nested procedural instances randomly disappear when GPU rendering on Linux
usd#2422 – Fix regression on frame changes in the usd procedural
System Requirements
Windows 10 or later, with the Visual Studio 2019 redistributable.
Linux with at least glibc 2.17 and libstdc++ 4.8.5 (gcc 4.8.5). This is equivalent to RHEL/CentOS 7.
macOS 11 or later.
x86-64 CPUs need to support the SSE4.1 instruction set. Apple Mac models with M series chips are natively supported.
GPU rendering and OptiX denoising work on Windows and Linux only, and require an NVIDIA GPU with the Maxwell architecture or later.
On Linux, we recommend 570.153.02 or higher drivers.
On Windows, we recommend 573.42 or higher drivers.
Intel OIDN GPU support is limited to:
macOS
Apple native CPUs (M1 and newer)
Windows
Intel Xe dedicated and integrated GPUs
NVIDIA GPUs using Turing or newer architectures
AMD GPUs with RDNA2 (Navi 21 only) and RDNA3 (Navi 3x) architectures 

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