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Upgrade Autodesk Analytics Program: Arnold includes a newer version of the Autodesk Analytics Program (ADP), which brings stability and performance improvements.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)
Bug Fixes
ARNOLD-15273 – Rare GPU artifacts with certain scene, GPU, and driver combinations
ARNOLD-17465 – Crash when a node turns invalid in IPR
ARNOLD-17498 – Fixed incorrect volume mipmap selection in certain situations
ARNOLD-17500 – Crash with invalid “idxs” user data
ARNOLD-17553 – Crashes with empty arrays in polymeshes
ARNOLD-17561 – [GPU] Matte value not inherited by child nodes
usd#2547 – Changing material terminal is not updated with Hydra 2
usd#2558 – Indexed user data shouldn’t author the idxs companion to USD
usd#2563 – Incorrect region renders in Hydra when one axis is not cropped
usd#2566 – Fixed crashes when a render delegate is deleted while another is rendering
usd#2568 – Changing the root shader in IPR is not updated when it was present in the previous shading tree
usd#2572 – Arnold product types not working if drivers:parameter:aov:name is not defined
usd#2580 – String per-instance primvars cannot resolve indices
System Requirements
Maya 2025, 2026 or 2027
Windows 10 or later, with the Visual Studio 2019 redistributable.
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