HtoA 6.4.6.2

01 April 2026

HtoA 6.4.6.2 is a bugfix release using Arnold 7.4.5.2. For the full list of features in HtoA 6.4.6.0, see the HtoA 6.4.6.0 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

Note:

Except for ARNOLD-16573 and ARNOLD-17500, these bug fixes are not included in Arnold 7.5.0.0 and Arnold 7.5.1.0

ARNOLD-13050 - Color manager could not find sRGB config with non-standard name
ARNOLD-15293 - Append with multipart triggers ERROR when output file already complete
ARNOLD-15504 - Missing update dependency for OpenPBR surface nits_per_unit
ARNOLD-15631 - Crash when enabling autocrop with multipart/tiled EXR outputs
ARNOLD-15889 - Rare crash when using .ass file with specific sizes and data
ARNOLD-16573 - Maketx crash with TIFFs with malformed exif data
ARNOLD-16749 - Random GPU crash
ARNOLD-17416 - Incorrect results with autocrop and multipart
ARNOLD-17429 - Fixed ARNOLD_ND_image MaterialX node definition input order mismatch that caused viewport shader compilation failure
ARNOLD-17441 - Allow interactive changes for aperture bloom parameters
ARNOLD-17451 - Crash in Linux with certain host processes
ARNOLD-17500 - Crash with invalid "idxs" user data
ARNOLD-17521 - Denoised outputs ignore driver's half precision
ARNOLD-17524 - Random crash with pointclouds
ARNOLD-17652 - Render files written on every pass for USD files

Houdini, Houdini FX, Houdini Indie and Houdini Education
- 20.0.896
- 20.5.684
- 21.0.596
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 supported in native mode
x86-64 CPUs need to support the SSE4.1 instruction set.
GPU rendering works on Windows and Linux only and requires driver versions newer than 582.16/580.126 (Windows/Linux). Older drivers will log an error and abort the render. Note that you can use New Feature Branch drivers.
- On Linux, we recommend 590.48 or higher drivers.
- On Windows, we recommend 591.28 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