MtoA is a hotfix release that uses Arnold 


System Requirements

  • Maya  2019, 2020 or 2022

  • 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 10.13 or later.
  • CPUs need to support the SSE4.1 instruction set. Apple Mac models with M series chip are supported under Rosetta 2 mode.
  • GPU rendering works on Windows and Linux only and requires an NVIDIA GPU of the Ampere, Turing, Volta, Pascal, or Maxwell architecture. We recommend using the 470.74 or higher drivers on Linux and 472.12 (Quadro), 472.12 (GeForce), or higher on Windows. See Getting Started with Arnold GPU for more information.
  • Optix™ denoiser requires an NVidia GPU with CUDA™ Compute Capability 5.0 and above.

Maya Plugins Compatibility 

MtoA works with the following Maya plugins

Known Issues

  • Arnold Hydra viewport disappears when a USD object is selected in the viewport. This is caused by a known issue in Maya-USD 

Bug Fixes

  • MTOA-848 - [BatchRender] Arnold crashes with ai:threads option if scene does not contain defaultArnoldRenderOptions
  • MTOA-872 - [XGen] "Can't open ptex" and "Too many open files" errors

  • ARNOLD-11141 - Incorrect luminance/blackbody/wavelength when using multiple render sessions with different linear color spaces
  • ARNOLD-11587 - Artifacts on switching texture_use_existing_tx in IPR for OSL shaders
  • ARNOLD-11588 - Switching texture_use_existing_tx does not update in IPR
  • ARNOLD-11636 - Out of range error when reading from Pref user data
  • ARNOLD-11676 - Resetting a face-varying user data does not remove the indices parameter
  • ARNOLD-11697 - Unable to raise GI sample settings from 0 during IPR
  • ARNOLD-11716 - Hang when rendering in free mode fails while another render is running
  • ARNOLD-11746 - Crash in OIDN denoiser
  • ARNOLD-11747 - Crash in node destroy after the render is finished
  • ARNOLD-11756 - Crash with standard_volume assigned to an implicit node
  • ARNOLD-11781 - Artifacts when rendering with CPU, adaptive, progressive and box filter
  • ARNOLD-11784 - Crash when creating and deleting AtUniverses in parallel
  • ARNOLD-11787 - Missing documentation about parameter in AiMsg* API
  • ARNOLD-11806 - Calling AiRenderBegin while rendering can cause a crash
  • ARNOLD-11819 - Crash in AiMsgXxx when creating and deleting multiple render sessions
  • ARNOLD-11825 - Instancer does not propagate user data of type array
  • ARNOLD-11831 - Missing Python bindings for AiParamValueGetPtr/SetPtr
  • ARNOLD-11840 - Confusing deprecation warning with visible lights
  • ARNOLD-11684 - [GPU] Hang with autobump when the displacement shader reads user data
  • ARNOLD-11702 - [GPU] Crash when flushing texture cache with OSL textures
  • ARNOLD-11711 - [GPU] Crash in interactive rendering with some light sampling settings
  • ARNOLD-11717 - [GPU] Crashes when rendering on GPU with Optix denoiser in batch render sessions with a display driver
  • ARNOLD-11804 - [GPU] Infinite values in P AOV on background
  • ARNOLD-11815 - [GPU] Crash in ramp_rgb with curves_only
  • ARNOLD-11612 - [OCIO] Warnings if the OCIO color manager uses a non default config file
  • ARNOLD-11640 - [MaterialX] Silent error when writing materials using the node name as the material name
  • ARNOLD-11654 - [MaterialX] Importing shaders with multiple outputs fails
  • usd#902 Render session is not passed to AiDeviceAutoSelect
  • usd#900 Avoid calling AiRenderBegin if render is already running
  • usd#905 Integer primvar Render Vars fail to render via husk
  • usd#906 Version is not set as default when returning SDR definitions
  • usd#928 Transform from the Point Intancer is not applied to instances
  • usd#918 Rendervars do not show up in Houdini 19
  • usd#915 Volume shader is not applied to the ArnoldVolume primitive in Hydra
  • usd#458 Point instancer should prune the primitives under its hierarchy
  • usd#904 No way to have Point Instancer prototypes hidden
  • usd#924 Writer now saves the default color manager node
  • usd#921 Remap curves primvars to avoid "wrong data count" errors
  • usd#854 Primvars is ignored when rendering basisCurves as b-spline

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