6.5.3.1 - Arnold for Houdini

24 July 2026

Arnold for Houdini 6.5.3.1 is a hotfix release using Arnold 7.5.3.0. For the full list of features in Arnold for Houdini 6.5.3.0, see the Arnold for Houdini 6.5.3.0 release notes.

Installation

• Download Arnold for Houdini from your Autodesk Account. See Download Arnold for more information about downloading HtoA from your Autodesk Account.

• Follow these installation instructions.

Bug Fixes

• HTOA-3370 - Fixed an allocator mismatch in Hick on macOS that broke classic HtoA's render view
• HTOA-3371 - Fixed a stack trace in the Solaris camera CreateScript

System Requirements

• Houdini, Houdini FX, Houdini Indie, and Houdini Education

  • 20.5.684
  • 21.0.729
  • 21.0.792
  • 22.0.368

• Flow Render is available for the default Houdini Qt versions (Qt6 for Houdini 22 and Houdini 21, and Qt5 for Houdini 20.5)

• Linux with at least glibc 2.28 and libstdc++ 11.2.1 (gcc 11.2.1). This is equivalent to Rocky 8.

• macOS 11 or later

• Apple Mac models with M series chips are natively supported by HtoA

• x86-64 CPUs need to support the SSE4.1 instruction set. Apple Mac models with M series chip are supported natively.

• GPU rendering and OptiX denoising work on Windows and Linux only, and require an NVIDIA GPU with the Maxwell architecture or later.

  • On Linux, we recommend 590.48 or higher drivers.
  • On Windows, we recommend 591.28 or higher drivers.

• Intel OIDN runs on all CPUs. GPU support is limited to:

  • macOS
    • Apple silicon GPUs (M1 and newer)
  • Linux
    • NVIDIA GPUs with Turing, Ampere, Ada Lovelace, Hopper, and Blackwell architectures
  • Windows
    • Intel Xe and Intel Arc dedicated and integrated GPUs
    • NVIDIA GPUs with Turing, Ampere, Ada Lovelace, Hopper, and Blackwell architectures
    • AMD GPUs with RDNA 2, RDNA 3, RDNA 3.5, and RDNA 4 architectures