Mental ray is a rendering software which generates images of outstanding quality and unsurpassed realism. It combines the physically correct simulation of the behavior of light with full programmability for the creation of any imaginable visual phenomena. The software uses advanced and proprietary acceleration and sampling techniques for faster rendering on even the smallest, single processor machines. At the same time, mental ray achieves optimal scalable performance through the exploitation of parallelism on both multiprocessor machines and across networks of machines.
Relaistic lighting can be achieve with this mental ray tutorial. This simple tutorial will guide you how to create realistic render scene. This tutorial completed with pictures that you can easily follow.