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" the eye in the scene.  This linking setup creates a mask of the eye.

Light Filters and PxrAovLight

Because PxrAovLight is a "light", light linking and light filters can modify the output AOV.  In this example, the PxrIntMultLightFilter is attached to PxrAovLight.  The Light Filter is only linked to the tree trunk, resulting in a gray value for the tree trunk mask.

Defining the Output AOV

Use the Render Settings AOVs tab to define a new display to which PxrAovLight will write. These three parameters should all be the same: