KtoA 4.4.2.1 - Arnold for Katana

9 June 2025

KtoA 4.4.2.1 uses Arnold 7.4.2.1 and is a bugfix release. For the full list of features in KtoA 4.4.2.0, see the KtoA 4.4.2.0 release notes.

Installation

ARNOLD-15719 - Crash when triplanar.smooth_before_displacement is passed to displacement
ARNOLD-16065 - Multipart render fails because parts do not have unique names
ARNOLD-16157 - Lights in moved procedurals instances are not properly moved
ARNOLD-16203 - Failures and crashes when rendering to exr in append mode
ARNOLD-16234 - Crash when rebuilding an instanced object
ARNOLD-16253 - Publishing compounds with custom arnold nodes does not render
ARNOLD-16289 - Updated the metadata for the density, roundness, width_edge, height_edge, and ramp parameters of the light blocker shader
ARNOLD-16299 - Ensure that a procedural's bounding box is computed after all child nodes are updated
ARNOLD-16301 - Improve clarity of GPU error messages when CUDA fails to load
ARNOLD-16344 - Incorrect scene unit conversions when processing procedurals in procedural cache
ARNOLD-16347 - Crash when using an invalid filename on an instanced procedural
usd#2296 - Proper support of stats mode in the render delegate
usd#2303 - Improve detection of hidden primitives that should be skipped
usd#2309 - Fix recent conflict between primitives visibility and purpose
usd#2313 - Arnold primvars aren't taken into account for ArnoldProceduralCustom primitives in usd

Windows 10 or later, with the Visual Studio 2019 redistributable.
Linux with at least glibc 2.17 and libstdc++ 4.8.5 (gcc 4.8.5). This is equivalent to RHEL 7. For Katana 7.0 and newer, an equivalent of RHEL 8 or newer is required.
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 560.35.03 or higher drivers.
- On Windows, we recommend 560.76 or higher drivers.
Katana Katana 6.0v1 or newer, Katana 6.5v1 or newer, Katana 7.0v1 or newer, Katana 7.5v1 or newer, or Katana 8.0v1 or newer.
Intel OIDN GPU support is limited to:
- 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