PxrAovLight is a handy utility light that allows a lighting artist to output a shot-specific AOV mask without needing to request one from the shading artists.

Light Linking with PxrAovLight

Use light linking to include/exclude pieces of geometry in the AOV. In this example, the PxrAovLight is "off" globally and "on" for the eye in the scene.  This linking setup creates a mask of the eye.

Defining the Output AOV

Once you set an AOV Name in the PxrAOVLight attributes, use the Render Settings AOVs tab to define a new display to which PxrAovLight will write.

Make sure the names match, like so:

Light Filters and PxrAovLight

Because PxrAovLight is a "light", light linking and light filters can modify the output AOV. 

Maya and RIB file

Download a Maya file or inspect a RIB file for this example:

Download