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Arnold Renderer HtoA v6.5.1.2 + Houdini v21 Download 2026

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.

27 May 2026

HtoA 6.5.1.2 is a bugfix release using Arnold 7.5.1.2. For the full list of features in HtoA 6.5.1.0, see the HtoA 6.5.1.0 release notes.

Bug Fixes
Bug Fixes
HTOA-3275 – Wrong overscan for some resolutions
HTOA-3278 – Fix slow shader network updates
ARNOLD-8717 – Interactive changes to a sphere center or radius are not transferred to its instances
ARNOLD-12159 – Dispersion transmission incorrectly raises error_color_bad_pixel debug coloring (blue pixels)
ARNOLD-14076 – standard_hair shading artifacts when used with non-curves objects
ARNOLD-15737 – Fix Ctrl+C (SIGINT) being ignored when Arnold is run in background or automated runs
ARNOLD-16842 – Modification of child object matrix in procedural_update is randomly ignored
ARNOLD-17339 – Log messages that were intended to show up only once could show up multiple times
ARNOLD-17411 – kick crashes when you render an ASS file that does not define any render outputs
ARNOLD-17682 – Some node parameter changes can be randomly lost during scene update

etc > https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_for_houdini_6512_html

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