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AOVs are set up by using a combination of ArnoldOutputChannelDefine and RenderOutputDefine node pairs, where you set up the AOV in the former, creating a channel, and then the latter use that channel to set up an actual render output. Once they are defined, there is no need to connect them, they're just available and if you create a Render node you'll see them listed as outputs.


aov_shaders

Can be used to add global AOV shaders like cryptomatte.

outputChannels

This is a placeholder parameter for output channel definitions.  If you select the root location, go to its attributes, and expand the channel definitions and outputChannels parameter, you will see any channels you have defined via ArnoldOuputChannelDefine nodes. For example:

 

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