Arnold是一款先进的蒙特卡罗光线追踪渲染器，专为特征长度动画和视觉效果的需求而打造。Arnold最初是​​与Sony Pictures Imageworks共同开发的，现在是他们的主要渲染器，在全球300多家工作室中使用，包括ILM，Framestore，MPC，The Mill和Digic Pictures。阿诺德是Monster House和Cloudy拍摄的数十部电影的主要渲染者，其中有肉食机会到环太平洋和重力。它可作为Linux，Windows和Mac OS X上的独立渲​​染器使用，并可通过Maya，Softimage，Houdini和Katana的插件
与C4D无缝集成：对象（实例，克隆器，变形器，生成器），MoGraph几何，头发和样条。

支持R18,R19,R20，如果安装后C4D 打不开，请先卸载插件，然后把C4D更新到最新版本，最后重新安装插件即可,全新Arnold 5.4.0.0内核

新功能：

• Added isolate selected feature to the IPR window
• Added render text overlay settings
• Added clip_geo shader which clips out all geometry against the shapes it has been assigned to. Users can limit the objects that are affected with trace sets, and optionally choose a specific shader for the intersection surfaces. Self-intersecting geometry or intersecting clipping objects can cause artifacts.
• Added AOV read shaders which let you access built-in AOVs in the AOV shader context or custom AOVs in the regular shading context.
• Autodesk analytics program: Arnold can now optionally send anonymous statistics data back to Autodesk for analysis, which helps optimizing Arnold for the commonly used workflows and systems. For the moment this is only available for OSX and disabled by default (opted-out). This service can be enabled (opted-in) through the kick -ADP flag, or through other Autodesk applications that support this, such as Maya and 3ds Max.

性能提升：

• Added IPR snapshot name and text overlay settings
• Added RGBA channel selector combo box to the IPR window toolbar
• Select IPR debug shading mode from the toolbar
• Improved IPR window side panel controls
• Added pixel information side panel to the IPR window
• Added support for Look at Camera tag in the IPR
• Configure shortcut of the node search dialog in the network editor
• Added support for scene length units
• List content of a procedural
• Define folders on the Arnold Procedural Assets tab
• Added layering to the alembic procedural
• Improved set_parameter operator UI
• Added transform mode to the set_parameter operator UI
• Improved set_transform operator UI
• Disable assignment expressions in the set_parameter operator
• Show available terminal nodes in the targets for include_graph operator

Bug修复：

• IPR crash with light instances and light linking
• IPR crash with light instances and mesh lights
• Bad IPR performance when translating heavy objects
• Crash when clicking on debug shading before starting the IPR
• Can’t edit IPR Zoom parameter when IPR is off
• Incorrect motion blur with xpGenerator and particles with limited lifespan
• Network editor shader tree does not open while searching shaders
• Subdivision is not baked when device is set to GPU
• Can not select output channels of an OSL node
• No Arnold tag on a camera created as a child of an object
• Can not control placement of newly created Arnold lights and drivers
• Driver path sometimes fails to update when switching selection between two driver objects

Win是2.6.0版本，Mac是2.5.2.1版本