What is Autodesk Arnold?
Autodesk Arnold software is an advanced Monte Carlo ray tracing renderer that helps you deliver beautiful and predictable results.

Navigate through the software with simple and intuitive controls.

Produce professional-grade renders with full artistic control.

Get immediate results with interactive rendering. 

28 August 2025

HtoA 6.4.4.0 is a minor feature release using Arnold 7.4.3.1. It is the first HtoA release supporting Houdini 21.

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

Enhancements
Support multiple AOVs with the same name: When rendering with hydra render products with husk, it is now possible to output the same AOV multiple times usd#2391

MeshLightAPI schema: MeshLight API schemas are now supported in Hydra and USD usd#2390

RenderPass primitives: Render Pass primitives are now supported when authored in USD files usd#2407

Bug Fixes
HTOA-2955 – Fix Solaris viewport compositing by correctly setting depthstyle to linear
HTOA-2994 – Fix deform_keys/transform_keys parameter warnings on the Alembic Object node
usd#2391 Remove warnings when rendering with an Arnold camera 

Houdini, Houdini FX, Houdini Indie and Houdini Education

20.0.896
20.5.684
21.0.440 

HOUDINI V21.5.487 GIVEN AT THE BOTTOM.

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