7.4.2.1 - Arnold User Guide

9 June 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-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

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 11 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 560.35.03 or higher drivers.
  • On Windows, we recommend 560.76 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