Release Date

December 10, 2019


Autodesk Network Licensing now requires new license files with an updated 2020 version. Please follow the instructions on this page to generate your license file. More info about Arnold 6 licensing can be found here.

Download and Installation

Arnold, KtoA, and other downloads are available here. Installation instructions come with KtoA, but can also be viewed here: Installation.


  • Arnold: 6.0.1+
  • Katana: 3.1v1+, 3.2v1+
  • Platforms:
    • Linux: x86-64, RHEL 6+ or compatible glibc
    • Windows: 7+ on x86-64, with VC++ 2015 redistributable installed
  • GPU: see here for detailed information. Required NVIDIA drivers:
    • Linux: 440.36 or higher

    • Windows: 441.28 or higher


  • Updated Arnold core: Update to Arnold 6.0.1, which features GPU support for light filters, energy-preserving rough refraction, improved Oren-Nayar diffuse and rough thin-wall transmission, improved license management, and much more in addition to many bug fixes.  Please see the release notes here. (#434, #419, #437)

  • Katana 3.2 support: Katana 3.2 is now supported as an official host. (#412)
  • MaterialX material export: In addition to baking MaterialX looks, the ArnoldMaterialXBake node can now bake materials, e.g. the surface/volume and displacement shaders attached to a shape, into a named material in a MaterialX file. ArnoldMaterialXAssign also more clearly differentiates between a material and a look being assigned. (#431)
  • MaterialX assign improvementsArnoldMaterialXAssign now allows selecting a specific material out of the file, rather than relying on the presence of entire looks. (#419)

  • Enhanced license management: New and improved license management app. (#408, #427, #336)
  • Improved GPU device selection: The manual GPU device selection (in the device area of ArnoldGlobalSettings) is improved, and error reporting when GPUs cannot be used has improved in the log. (#410)

  • Curves user data improvements: User data on curves is now properly handled, even when triplicating endpoints for B-spline and Catmull-Rom bases. There is also a new operator/node for manipulating curve widths more easily, ArnoldCurveSetWidth. (#421, #380, #391)

  • Installer: KtoA now is officially distributed via an installer on both Linux and Windows, with binaries signed on Windows as authentic Autodesk products. For custom/local builds the old zip and tarballs can still be generated, however. The installer will try to find (and allow the user to set) the katana location, so that it can generate a launch script which makes it much easier to run KtoA. For power users they can still use their existing launch setup for Katana, setting KATANA_RESOURCES, etc as before. (#309, #429)

Incompatible Changes

  • Dropped support for Katana 3.0.x series: Starting in KtoA 3.0, support for Katana 3.0.x is dropped, but release series 3.1.x and 3.2.x are supported.

  • ArnoldMaterialXAssign material parameterArnoldMaterialXAssign previously re-used the look parameter when assigning materials. Now that parameter is hidden when materials are being assigned and instead the material parameter is populated with the available materials from the MaterialX file. You may need to re-select the MaterialX file to get it to refresh with the new parameter. (#431)

  • color_convert shader args: The args for color_convert were wrong, and reflected a much earlier version of the shader. These have been corrected, but you should set the from and to parameters manually on any existing color_convert shaders in your shader network to ensure they have correct values. (#373)

Bug Fixes

  • #430 Additional AOVs not denoised by noice

  • #443 Arnold crashing when using geometry.point.width on linear curves in Katana

  • #373 enumerated value -1 is out of range on color_convert node
  • #422 Light filters are not assigned to instanced lights
  • #436 OSL array parameters not presented in the shader UI
  • #438 rim_light parameter not working in toon shader
  • #439 Make license manager window non-modal
  • #441 Live changes of image shader on quad and skydome lights not working
  • #442 Some textures not loading for hydra viewer lights
  • #364 Increasing the radius of a spotlight with a gobo tiles the viewport preview of said gobo
  • #405 arnoldLightStatements.lightGroup attribute is not inherited
  • #440 Non-input shader node parameters (e.g. __gpu__) connected by default


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