Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
The most comprehensive resource to understand Radiance is still "Rendering with Radiance," which is available as a $7 US PDF download or in soft cover from: https://www.radiance-online.org/learning/documentation/book
You can also access the first chapter, which is a decent introduction, directly from the website. For the details, you will need the later chapters that discuss the methods and parameters, although I can recommend one of John Mardaljevic's presentations to get you started, such as: https://www.radiance-online.org/community/workshops/2011-berkeley-ca/presentations/day1/JM_AmbientCalculation.pdf
I also like Raphael Compagnon's daylighting tutorial from way back in 1997: https://floyd.lbl.gov/radiance/refer/rc97tut.pdf
Best, -Greg
