KtoA 4.4.4.1 - Arnold for Katana

17 December 2025

KtoA 4.4.4.1 is a bugfix release using Arnold 7.4.4.1. For the full list of features in KtoA 4.4.4.0, see the KtoA 4.4.4.0 release notes.

Installation

ARNOLD-16840 - Fixed custom AOV settings resetting when in interactive mode.
ARNOLD-17049 - Fixed bloom rotation in aperture mode for angles below -180°
ARNOLD-17058 - [GPU] Fixed incorrect per-depth ray counts reported in stats.
ARNOLD-17076 - Fixed random missing lights when using light_group and shadow_group on ginstance.
ARNOLD-17088 - Fixed random crash when using curves and points nodes with min_pixel_width.
ARNOLD-17140 - Faster procedural node destruction when most of its nodes are modified. Fixes very slow instancer destruction.
ARNOLD-17149 - [GPU] Fixed small per-instance GPU memory leak.
ARNOLD-17151 - Fixed an incorrect "Rendering CPU utilization was only 0%" message being reported when utilization was greater than 0%.
ARNOLD-17171 - Fixed AiTextureTxFileNeedsUpdate returning false when colorconvert arguments contain empty spaces.
usd#2467 - Hidden primitives do not show up when turned visible
usd#2472 - Regression in render settings default value for autoTX
usd#2478 - Support the Z AOV for the Hydra depth buffer

Windows 10 or later, with the Visual Studio 2019 redistributable.
Linux with at least glibc 2.28. This is equivalent to RHEL/Rocky 8.
x86-64 CPUs need to support the SSE4.1 instruction set.
GPU rendering and Optix denoising work on Windows and Linux only, and require an NVIDIA GPU with the Maxwell architecture or later.
- On Linux, we recommend 580.95.05 or higher drivers.
- On Windows, we recommend 581.42 or higher drivers.
Katana 7.0v1 or newer, Katana 7.5v1 or newer, or Katana 8.0v1 or newer.
Intel OIDN GPU support is limited to:
- Linux
  - NVIDIA GPUs using Turing or newer architectures
- Windows
  - Intel Xe dedicated and integrated GPUs
  - NVIDIA GPUs using Turing or newer architectures
  - AMD GPUs with RDNA2 (Navi 21 only) and RDNA3 (Navi 3x) architectures