Find this section in each render layer’s Attribute Editor. Right-click the desired layer and select Attributes from the right-mouse menu to display the render layer’s Attribute Editor.
Select this option to render a global illumination pass for this layer. For more information on global illumination, see Global illumination.
Except where otherwise noted, this work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License