PxrLightEmission

PxrLightEmission takes no parameters. It is intended to be assigned to geometric area lights that are camera visible. Its purpose is to communicate the renderer's understanding of the emission (determined by a light source shader such as PxrAreaLightSource) to a color that can be displayed for the light itself.

Assigning this Bxdf to an envsphere with a light source shader such as PxrEnvDayLight will produce a visible sky in the background.