Arnold for Cinema 4D (or C4DtoA) provides a bridge to the Arnold renderer from within the standard Cinema 4D interface.

Features
Seamless integration with C4D: objects (instances, cloners, deformers, generators), MoGraph geometry, hair and splines.
Support for both native particles and Thinking Particles.
The fastest interactive rendering (IPR) of all Arnold plugins, allows parameter changes to be rapidly previewed without interrupting your work.
Arnold Shading Network Editor, a node-based material editor.
A comprehensive list of shaders and utilities, including vertex maps and per-face materials.
Volume rendering with OpenVDB.
Deferred, render time generation of geometry with the Arnold procedural node.
Native linear workflow.
Team Render, including single-frame distributed rendering.
Support for third party plugins like X-Particles and Turbulence FD. 

C4DtoA 4.9.1.1 is a bugfix release using Arnold 7.5.1.1. 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
Bug Fixes
ARNOLD-14348 – Fixed random crash while rendering on ARM64 machines
ARNOLD-17656 – Fixed a hang when replacing a shader that was connected to a light
ARNOLD-17660 – AiProceduralViewport crashes with implicit nodes
usd#2607 – Updating light shaders interactively hangs the render
usd#2613 – Missing clip files and UDIMs from search path when collecting scene assets
usd#2615 – Export material bindings for volume nodes in the volume context
usd#2589 – Implement scene index dependencies when materials get added or removed
usd#2582 – Arnold-disabled nodes should not be authored to USD
usd#2433 – Support interactive changes of shaders connected to quad lights
usd#2611 – Support exporting geometries that get added during a sequence 

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