7.4.2.2 - Arnold User Guide

July 2, 2025

This is a bug-fix release. For the full list of features in Arnold 7.4.2, see the Arnold 7.4.2.0 release notes.

Bug Fixes

• ARNOLD-13885 - Arnold GPU does not match CPU for polymesh.matte

• ARNOLD-14922 - Matrix modification of child object matrix in procedural_update is randomly ignored

• ARNOLD-15574 - Broken Cryptomatte due to NVIDIA compiler/driver float bug starting with 553.09

• ARNOLD-16333 - MaterialX relative path does not work with Arnold

• ARNOLD-16328 - Bucket corners stay at the end of the rendering in ARV with imagers

• ARNOLD-16410 - Numerical precision error in camera shutter_curve when almost 1

• ARNOLD-16415 - Don't reinterpret_type the pointers

• ARNOLD-16418 - Crash when adding objects to a funcptr procedural

• ARNOLD-16492 - Regression in procedural destruction time

• usd#2340 - Fix warnings when nodes are deleted during batch sessions

• usd#2334 - Fix random crashes with husk and cryptomatte

System Requirements

• 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/CentOS 7.
• macOS 10.13 or later.
• x86-64 CPUs need to support the SSE4.1 instruction set. Apple Mac models with M series chips are natively supported.
• 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 570.153.02 or higher drivers.
    • On Windows, we recommend 573.42 or higher drivers.
• 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
    • AMD GPUs with RDNA2 (Navi 21 only) and RDNA3 (Navi 3x) architectures