Best V-Ray settings - Indirect illumination

This tutorial is about theory and practice of the Global Illumination in 3ds max V-Ray. This tutorial answers the following questions. What is the indirect illumination? How do indirect lighting looks in nature? How does the global illumination differ from the secondary? What are the diffuse reflected rays? How the GI algorithm implemented in computer graphics? What are the primary bounces and how they differ from the secondary ones? How the hemispheric diffuse reflections look schematically? How to setup the GI in Vray on practice? How the global illumination affects the overall scene lightin...