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
    • 19.0.531
    • 19.0.561
  • 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 chip 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. We recommend using the 470.74 or higher drivers on Linux and 472.12 (Quadro), 472.12 (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.

Bug Fixes

  • htoa#1910 Fix image.filename USD metadata
  • htoa#1914 Disable enable progressive render toggle in GPU mode

  • ARNOLD-11969 - Min pixel width on curves doesn't work on first render pass
  • ARNOLD-11945 - Crash when mixing transmission on overlapping meshes
  • ARNOLD-11852 - Memory leak with imagers when rendering multiple frames
  • ARNOLD-11836 - Exiting Arnold during a render causes hangs on Windows
  • ARNOLD-11835 - Full frame imagers crash with negative render region
  • ARNOLD-10400 - Volume motion blur advection computation was incorrect
  • ARNOLD-10391 - Volume motion blur used incorrect motion/shutter intervals
  • ARNOLD-10281 - Mix parameter in mix_shader is ignored for determining whether a shape is opaque or not
  • ARNOLD-12055 - [GPU] Crash switching from CPU to GPU with Optix denoiser
  • ARNOLD-10577 - [GPU] Textured skydome_light leaks memory over multiple frames in a session

  • No labels
Privacy settings / Do not sell my personal information / Privacy/Cookies