KtoA is a bug fix release, which bundles Arnold core 

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.
  • 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.



  • KTOA-733 - Exported ass files have ".temp.exr" as output file
  • KTOA-765 - Wrong type for subdiv_face_iterations when you use AlembicIn
  • KTOA-773 - Fix ArnoldRendererInfoDump console verbosity so it's set before the render session starts
  • KTOA-781 - Live change in imager results in full re-render

  • ARNOLD-12230 - Crash when rendering quad lights with non-default roundness in multiple render sessions
  • ARNOLD-12229 - Crash when adjusting a camera used across multiple render session lifetimes
  • ARNOLD-12228 - Deep driver crashes when batch rendering with progressive negative-AA
  • ARNOLD-12223 - Do not show a dialog box when loading invalid plugins on Windows
  • ARNOLD-12216 - Thread priority was no longer affecting render threads on Windows
  • ARNOLD-12208 - Crash when destroying and recreating a RenderSession with GPU rendering or Optix denoising
  • ARNOLD-12054 - Restarted checkpoint renders were always starting progress at 0%
  • ARNOLD-12192 - [Alembic] Root of b-spline curve is cut short
  • ARNOLD-12253 - [GPU] Crash when deleting and creating render sessions for the same universe
  • ARNOLD-12037 - [GPU] Artifacts in Light Path Expression AOVs using closure labels

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