KtoA（Katana to Arnold） 是由SolidAngle开发、Autodesk维护的专业渲染桥接插件，专为将Arnold强大的光线追踪渲染器无缝集成到Katana灯光与场景管理流程而设计。通过KtoA，艺术家可在Katana中直接调用Arnold的高质量渲染能力，全面支持其材质系统、灯光模型、着色器、AOV 输出及 GPU/CPU 混合渲染。该插件为影视、动画与 VFX 制作提供了高效、灵活且可扩展的渲染解决方案，使复杂场景的灯光与最终成像过程更加高效与可控。

Arnold for Katana (or KtoA) provides a bridge to the Arnold renderer from within the standard Katana interface.

主要功能：

• Natural integration with Katana nodes, scenegraph, and scripting.
• Multi-threaded scene translation, made possible by Geolib3 in Katana 2.
• Bundled Arnold, shaders, and plugins for a smooth out-of-the-box experience.
• Support for the latest Arnold 4.2.x series.
• Improved interactivity for live rendering (IPR) allows look changes to be rapidly previewed.
• Ultra-fast OpenVDB volume rendering.
• Shader networks.
• Works with third-party shaders and renderer procedurals (for hair, etc).
• Render outputs and AOVs, including Deep EXR.
• Supports the curves location type in Katana for hair rendering.
• Many light types and light filters supported, as well as interactive modification of lights.
• Object parameters and global options better match what is available in Arnold.
• Improved documentation within Katana (args files).

• 安装对应版本插件，拷贝ai.dll到安装目录的bin文件夹里面，替换即可，比如默认C:\\用户\\你的用户名\\ktoa\\ktoa-4.4.3.1-kat8.0-windows\\bin