Sky Models

   3DS Max presents us with 3 different sky models to use: CIE, Haze, and Perez. Note that all the images below have undergone levels correction as a post process.
   At render time, the fastest was CIE, then Haze and Finally Perez. Apparently CIE is designed to be fast and accurate, and Perez is designed to be used in conjunction with real weather data files. It appears to me as if the haze driven model is designed to look accurate, without actually being so.

CIE System

Haze Driven

Perez Model

Lighting Study

Using the date time and location setting the Daylight System Assembly head, I rendered 100 frames of the transition of light across these surfaces. Pretty neat! If anyone was intereseted the date was set to summer, and the location was Miami Beach.