Scene with all lights affecting all objectsSame scene demonstrating light linkingSame scene demonstrating shadow linking

By default every light in a scene illuminates and casts a shadow of every object in a scene. However there are times when you want specific lights to only affect certain objects. Even further than that you might want a certain light to illuminate an object without casting a shadow.

Light linking lets you control the affect a light has on your scene objects on a per-object basis. 

Shadow linking allows you to break the casting of shadows from lights on a per-object basis. 

Each of these methods is covered in detail below.

Light Linking

Shadow Linking