6.4.2.3 - Arnold for Houdini

2 July 2025

Arnold for Houdini 6.4.2.3 uses Arnold 7.4.2.2 and is a minor feature release.

Installation

Download Arnold for Houdini from your Autodesk Account. See Download Arnold for more information about downloading Arnold for Houdini from your Autodesk Account.
Follow these installation instructions.

ARNOLD-13885 - Arnold GPU does not match CPU for polymesh.matte
ARNOLD-14922 - Matrix modification of child object matrix in procedural_update is randomly ignored
ARNOLD-15574 - Broken Cryptomatte due to NVIDIA compiler/driver float bug starting with 553.09
ARNOLD-16333 - MaterialX relative path does not work with Arnold
ARNOLD-16328 - Bucket corners stay at the end of the rendering in ARV with imagers
ARNOLD-16410 - Numerical precision error in camera shutter_curve when almost 1
ARNOLD-16415 - Don't reinterpret_type the pointers
ARNOLD-16418 - Crash when adding objects to a funcptr procedural
ARNOLD-16492 - Regression in procedural destruction time
usd#2340 - Fix warnings when nodes are deleted during batch sessions
usd#2334 - Fix random crashes with husk and cryptomatte

Houdini, Houdini FX, Houdini Indie and Houdini Education
- 19.5.805
- 20.0.896
- 20.5.613
Linux with at least glibc 2.28 and libstdc++ 9.3.1 (gcc 9.3.1) for Houdini 19.5, 20 and 20.5. This is equivalent to RHEL/CentOS 7.
Linux with at least glibc 2.17 and libstdc++ 11.2.1 (gcc 11.2.1) for Houdini 20/20.5. 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 mode.
GPU rendering works on Windows and Linux only and requires an NVIDIA GPU with the Maxwell architecture or later.
- On Linux, we recommend 570.153.02 or higher drivers.
- On Windows, we recommend 573.42 or higher drivers.
Optix™ denoiser requires an NVidia GPU with CUDA™ Compute Capability 5.0 and above.
Intel OIDN GPU support is limited to:
- MacOS
  - Apple native CPUs (M1 and newer)
- Windows
  - Intel Xe dedicated and integrated GPUs
  - NVIDIA GPUs using Turing or newer architectures