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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.
Official site