arnold5.0后，alshader就大部分材质停止开发了，唯一就剩cryptomatte还在更新。关于cryptomatte的用途，就不细说了，网上都能搜到。
Beta 4 release notes: （经测试MtoA 3.0.0可用）
Bug fixes:
- Fixed crash with multiple Cryptomatte shaders in scene.
- Added error detection for issue where Cryptomatte filters do not get set up correctly, (reported by one user by not reproducible).
Beta 3 release notes:
Features
- Support Arnold 5.1 adaptive sampling
- Support for mixed bit-depth EXR files
- Support long object names (up to 2048 characters)
- Added preview_in_exr control
- False (default): Omit preview channels when EXR drivers are being used
- True: Keep behavior as usual
- Support C4DtoA Arnold 5.1 naming changes
- Add controls to disable various kinds of name processing
- Switched to Daniel Schmidt’s faster hash to float code
Bug fixes
- Crash when rendering with non-aov shaders in Arnold 5.1
- Skip disabled nodes in manifest
Beta 2 release notes:
Features
- Test suite for developers
- Added Cinema 4D name parsing (Sen Haerens)
- aov_shader metadata for KtoA and MtoA
- Unicode and special characters in names are now tested and supported
Bug fixes
- Restored Maya name in special cases (ns1:obj1|ns2:obj2)
- Fixed some crashes with malformed names, added tests for this
- Fixed metadata when rendering multiple Cryptomattes into one EXR file (Sen Haerens)
- Fixed metadata with multiple drivers if one driver did not support metadata (Sen Haerens)
- Fixed manifests in custom Cryptomattes
- Fixed manifests for standard cryptomattes with array (per poly) overrides
- Fixed special characters (quotes, slashes) in manifests
- Manifests no longer include list aggregate nodes (Sen Haerens)
- Fixed issue passing AtStrings to variadic arguments in gcc older than 4.8.x (Sachin Shrestha)
- Statically link the stdc++ lib (Sachin Shrestha)
下载地址 https://github.com/anderslanglands/alShaders2/releases
安装方法：
1、将安装包/bin里面的三个文件复制到 arnold安装目录/shaders里，2、将安装包/ae 里的cryptomatteTemplate.py文件复制到 arnold安装目录/scripts/mtoa/ui/ae里。 开maya，arnold渲染设置的aov里面就会看到三个cryptomatte通道。
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