HtoA is a bug fix release using Arnold

Please download the .py3 version of the HtoA installer when installing the Python 3 versions of Houdini.


  1. Download Arnold for Houdini

  2. Follow these installation instructions

System Requirements

Houdini, Houdini FX, Houdini Indie and Houdini Education

  • 18.0.597

  • 18.5.759

  • 19.0.622

  • 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 chips 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.
  • Optix™ denoiser requires an NVidia GPU with CUDA™ Compute Capability 5.0 and above.

In the driver page select "Windows Driver Type:" DCH

The cache will also need to be re-populated after installing a new Arnold version, updating to a new NVIDIA driver, or changing the hardware configuration of GPUs on the system. More information can be found here.

Bug Fixes

  • Fix crash during IPR light updates (HTOA-1989)
  • Fix regression affecting light color translation in Solaris (usd#1169)

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