HtoA 6.4.1.1 - Arnold for Houdini
6 May 2025
HtoA 6.4.1.1 is a bugfix release that uses Arnold 7.4.1.1. For the full list of features in HtoA 6.4.1, see the HtoA 6.4.1 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
Bug Fixes
- HTOA-2907 - Fixed classic HtoA IPR on Mac (caused by incorrect rpaths)
- HTOA-2138 - Import materials now sets uv_projection.matrix properly
- HTOA-2902 - Arnold ROP no longer explicitly checks if a directory is writable when Create Intermediate Directories is set
- ARNOLD-16006 - Adding Cryptomatte causes Opacity AOV to be black
- ARNOLD-16044 - [GPU] IPR crash when modifying a shape's parameter
- ARNOLD-16116 - Render report fixes and cleanups
- ARNOLD-16155 - Emission cone is too narrow for IES lights in Global Light Sampling
- ARNOLD-16181 - Performance regression in initialization of instanced procedurals
- ARNOLD-16184 - Crash when
options.outputsis set to a null array pointer - ARNOLD-16187 - Change default for
procedural_instancing_optimizationfromexhaustivetoconservative - ARNOLD-16214 - Procedural bounding box not correctly recalculated after adding nodes in
procedural_update - ARNOLD-16247 - Crash when using
AiProceduralExpandwithout a render session - usd#2269 - Fix lost shader connections when the Hydra procedural was updated (mtoa)
- usd#2268 - Re-enable instancer motion blur on the first rendered frame by recomputing the transform matrices when the shutter is updated
System Requirements
- Houdini, Houdini FX, Houdini Indie and Houdini Education
- 19.5.805
- 20.0.896
- 20.5.584
- 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 560.35.03 or higher drivers.
- On Windows, we recommend 560.76 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
- MacOS