MtoA 4.2.1 introduces Arnold and is a minor feature release bringing Light mixer fixes and improvement


System Requirements

  • Maya 2018, 2019 or 2020

  • 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 to 10.15. Note that macOS 11 Big Sur is not certified.
  • CPUs need to support the SSE4.1 instruction set.
  • 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 460.39 or higher drivers on Linux and 461.40 (Quadro), 461.40 (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.


  • Light Mixer

    • A new refresh button to add / reset light group AOV's
    • Light Mixer gets added to the top of the stack
  • File Export (.ass/.usd)

    • Allow to use transform node names instead of shapes through new param in the render settings (exportDagName)

Bug Fixes

  • mtoa#4385 - ARV progress bar inaccurate when using Adaptive Sampling
  • mtoa#4450 - Mac & Linux: crash loading MayaUSD plugin if MtoA is already loaded
  • mtoa#4462 - animated procedural in standin doesn't update in viewport, does update in render
  • mtoa#4474 - Always export residual lights in the light mixer, with default values
  • mtoa#4476 - Imagers : Handle Light mixer limitations elegantly
  • mtoa#4477 - Invalid color management data when opening a new scene with ARV opened

  • core#10355 Do not warn about loading non-Arnold Yeti libraries
  • core#10334 [GPU] Deleting layers in imager_light_mixer cause GPU crashes and frame corruption
  • core#10345 [GPU] Stack overflow when using wireframe with many sided polygons
  • core#10306 [Imagers] imager_denoiser_noice creates black layers for AOVs not matching layer_selection
  • core#10269 [Imagers] Slowdown when doing frequent imager updates
  • core#7216 [OSL] Wrong hit distance returned after trace() call
  • core#10316 Rare IPR hang
  • core#4530 Reset texture cache stats after every render
  • core#4845 Support detection of Windows version > 8.0
  • usd#654 Transform is not synced for the points primitive

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