Currently, one of the best ways of achieving photo-realistic imagery is to render using Mental Ray for Maya. Mental Ray offers a Global Illumination and Final Gather solution, which when combined, simulates the physics of real world lighting effects. Now, for the first time in 3d, lighting techniques used by photographers and filmmakers can be applied to computer graphics. The following is a guide for setting up Global Illumination and Final Gather using Mental Ray for Maya. It is based on notes from the web, Maya's Help manual and good-old fashion experimentation.