GI SetupGeneral Irradiance Cache Irradiance Cache (Legacy) Radiosity Maps Light Mapping Cache Files Options
First some basics regarding parameters.
The standard GI settings described herein have been set up and defined using presets to offer the best, error-free results for most applications. Basic settings are located in the General tab.
Don’t worry about the other GI parameters until/unless you want to delve deeper into GI - fine tuning, reducing render times, etc.