Used for Baking down texture and scene lighting. 

Figure 1: Baking Settings parameters

Parameters

    • Baking Group ID - This specifies what baking group the object belongs to. The value provided assigns the object to the corresponding baking. This is the first baking group by default.
    • Baking UV Transform - This tells the Baking Camera how to project the UV sets of the object layer. This affects the way the UVs from that object layer are projected into the UV space when rendered using the baking camera. The value specified as baking UV transform will be used by the baking camera to place all UVs that belong to the geometry in that object layer in the UV space. This lets you bake entire scene light-maps, including all render passes in one single render without any additional compositing.