22 January 2026
HtoA 6.4.5.3 is a bugfix release using Arnold 7.4.4.2. For the full list of features in HtoA 6.4.5.0, see the HtoA 6.4.5.0 release notes.
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
HTOA-3118 - Incorrect file generation for baked textures in COPs
ARNOLD-16335 - Rare crash during node update when using cryptomatte
ARNOLD-16739 - Global Light Sampling is not correctly enabled in certain cases in IPR
ARNOLD-16815 - DeepEXR driver hangs with certain invalid samples
ARNOLD-16945 - Fix rare crash when loading some USD files
ARNOLD-17173 - Conflicting MaterialX definitions for convert shaders cause random failures
ARNOLD-17193 - No path mapping on OSL textures if texture_use_existing_tx is turned off
ARNOLD-17195 - Crash when interactively replacing a procedural with an empty file
ARNOLD-17206 - Crash when node does not have an AtNodeEntry
ARNOLD-17296 - Crash when there are multiple non-simple imager_lens_effects nodes
usd#2509 - Fix crash in Solaris when changing the rendered LOP interactively
usd#2514 - Fix random inconsistencies between instantaneousShutter and ignore_motion_blur in Hydra
Houdini, Houdini FX, Houdini Indie and Houdini Education
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.
Optix™ denoiser requires an NVidia GPU with CUDA™ Compute Capability 5.0 and above.
Intel OIDN GPU support is limited to: