4.2.2 - Date: 27.04.2022
Enhancements
-Updated material previews:Lighting is improved in material preview scenes and the 'A' letter from the Arnold logo is added to the bottom right corner to easily identify Arnold materials in the Material Manager. A new cloth, volume, and atmosphere volume preview is added as well. (C4DTOA-2716)

-Scale in material previews:Arnold materials (legacy and Node Material) have a new option to control the scale of the preview scene. By default, the size of the object in the preview is 1m. By setting the Preview Scale to 1cm (or 0.01), the object is scaled down to 1cm. This can be useful when working with small objects and previewing shaders that depend on length units (e.g. SSS radius, transmission depth, etc.). (C4DTOA-2724)

-Coat Affect Color and Affect Roughness in standard_surface:Affect Color and Affect Roughness parameters are now available on the standard_surface shader UI, under the Coat group. (C4DTOA-2717)
-Arnold Community forum in the Help menu:Arnold Answers is migrated to the Autodesk Community Forum. The url and label in the Help menu are replaced. (C4DTOA-2731)

- C4DTOA-2726 - Rendering to the Picture Viewer blocks the UI
- C4DTOA-2732 - Crash when exporting a scene which contains a scatter object
- C4DTOA-2733 - 'Plugin ID collides' error messages in Cinema 4D S26
- ARNOLD-12230 - Crash when rendering quad lights with non-default roundness in multiple render sessions
- ARNOLD-12229 - Crash when adjusting a camera used across multiple render session lifetimes
- ARNOLD-12228 - Deep driver crashes when batch rendering with progressive negative-AA
- ARNOLD-12223 - Do not show a dialog box when loading invalid plugins on Windows
- ARNOLD-12216 - Thread priority was no longer affecting render threads on Windows
- ARNOLD-12208 - Crash when destroying and recreating a RenderSession with GPU rendering or Optix denoising
- ARNOLD-12054 - Restarted checkpoint renders were always starting progress at 0%
- ARNOLD-12192 - [Alembic] Root of b-spline curve is cut short
- ARNOLD-12253 - [GPU] Crash when deleting and creating render sessions for the same universe
- ARNOLD-12037 - [GPU] Artifacts in Light Path Expression AOVs using closure labels
Arnold is an advanced cross-platformrendering library, or API, developed by Solid Angle and used by a number of prominent organizations in film, television and animation, including Sony Pictures Imageworks. It was developed as a photo-realistic, physically-based ray tracing alternative to traditional scanline based rendering software for CG animation.
Arnold uses cutting-edge algorithms that make the most effective use of your computer's hardware resources: memory, disk space, multiple processor cores, and SIMD/SSE units.
The Arnold architecture was designed to easily adapt to existing pipelines. It is built on top of a pluggable node system; users can extend and customize the system by writing new shaders, cameras, filters and output driver nodes, as well as procedural geometry, custom ray types and user-defined geometric data. The primary goal of the Arnold architecture is to provide a complete solution as a primary renderer for animation and visual effects.
Arnold renderer
Arnold for Cinema4D (C4DtoA)supports most Cinema 4D features such as instances, cloners, deformers, generators, MoGraph geometry, hair, and ThinkingParticles. It also supports both animation and single frame distributed rendering in Team Render, allowing the use of all computers in a local network to speed-up Arnold rendering. Third-party plugins TurbulenceFD and X-Particles are natively supported, allowing artists to render high quality smoke, fire, and particle effects with fully interactive feedback. Other features include volume rendering with OpenVDB, a node-based material editor and a comprehensive list of shaders and utilities, including vertex maps and per-face materials.
HOW TO Realistic Shaders in Cinema 4d and Arnold | Plastic, Wood, Concrete and Metal | Tutorial
Solid AngleSL is the technology company behind the Arnold rendering software, with offices in Madrid and London and customers throughout the world including Framestore, DreamWorks, ILM, Sony Pictures Imageworks, MPC, The Mill, Mikros Image and Rising Sun Pictures. Arnold was designed from the ground up to efficiently raytrace the complex geometric datasets required for feature-length CGI animation and big budget visual effects, while at the same time simplifying the pipeline, reducing the number of passes, minimizing storage requirements and greatly enhancing interactivity for lighting artists.

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