4.9.1.2

27 May 2026

C4DtoA 4.9.1.2 is a bugfix release using Arnold 7.5.1.2. For the full list of features in C4DtoA 4.9.1, see the C4DtoA 4.9.1 release notes.

Installation

• Download Arnold for Cinema 4D from your Autodesk Account. See Download Arnold for more information about downloading C4DtoA from your Autodesk Account.

• Follow these installation instructions.

Cinema 4D Compatibility

• 2024.4.0 and above
• 2025.0.0 and above
• 2026.0.0 and above

Known Issues

• Cannot open the Arnold License Manager on macOS and Linux (ARNOLD-18000)

Bug Fixes

• C4DTOA-3546 - Memory corruption on linux when Cinema 4D Commandline exits
• C4DTOA-3562 - Arnold denoiser tool does not detect frame range
• 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
• ARNOLD-17696 - Error when assigning MaterialX shader to a USD prim
• ARNOLD-17708 - Crash on process exit when Arnold library is loaded with deep bindings
• ARNOLD-17712 - SSS is broken with native instancing
• ARNOLD-17728 - Fix regression of rare crash when compiling OSL shaders during IPR
• ARNOLD-17748 - Fix random crashes/hangs at process exit and during rendering with network (NLM) licenses
• ARNOLD-17757 - Artifacts when using oriented curves with a scaled transform matrix
• ARNOLD-17766 - Point cloud cache causes a CUDA exception when used with multiple GPUs
• ARNOLD-17769 - Fix random crash/hang at process exit caused by AiMsg calls when missing AiEnd
• ARNOLD-17771 - Rare crash at process exit when using Arnold denoiser (noice) imager
• ARNOLD-17794 - GPU rendering issue with native shape instancing
• ARNOLD-17801 - Procedural instances sometimes do not render in conservative optimization mode
• ARNOLD-17803 - Rare crash when instancing procedurals
• ARNOLD-17807 - Random GPU crash in optixQueryFunctionTable after modifying objects
• ARNOLD-17808 - kick -o does not work if drivers NULL in ASS file
• ARNOLD-17817 - Kick output directory prefix is not applied when overriding the filename via -set
• usd#2635 - Fix rounding issue with husk when overscan is used at certain resolutions

System Requirements

• Windows 10 or later, with the Visual Studio 2019 redistributable.
• Linux with at least glibc 2.28. This is equivalent to RHEL/Rocky 8.
• macOS 12 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 590.48 or higher drivers.
  • On Windows, we recommend 591.28 or higher drivers.
• Intel OIDN runs on all CPUs. GPU support is limited to:
  • macOS
    • Apple silicon GPUs (M1 and newer)
  • Linux
    • NVIDIA GPUs with Turing, Ampere, Ada Lovelace, Hopper, and Blackwell architectures
  • Windows
    • Intel Xe and Intel Arc dedicated and integrated GPUs
    • NVIDIA GPUs with Turing, Ampere, Ada Lovelace, Hopper, and Blackwell architectures
    • AMD GPUs with RDNA 2, RDNA 3, RDNA 3.5, and RDNA 4 architectures