RENDERMAN 22 DOCUMENTATION

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Daylight simulations are useful when you want a quick and easy setup for exterior lighting or maybe some look development time but you don't have an HDRI for the PxrDomeLight available. The simplicity and realism make this light a favorite for artists.

 

An environment light that uses a simple physical model for terrestrial daylight under clear or hazy skies. The sky model is based on A Practical Analytic Model for Daylight by A.J. Preetham, Peter Shirley, and Brian Smits. The solar disk model is adapted from H.C. Hottel's A Simple Model for Estimating the Transmittance of Direct Solar Radiation Through Clear Atmospheres, with parameters curve fitted for turbidity from physical data and a simple limb darkening model.

 

Daylight simulations are useful when you want a quick and easy setup for exterior lighting or maybe some look development time but you don't have an HDRI for the PxrDomeLight available. The simplicity and realism make this light a favorite for artists.

 

Note

You will see mention of "non-physical" controls. These controls are designed to help artists make art-directed imagery by ignoring certain laws of physics we usually simulate.

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