In this new tip tutorial for 3ds max we'll see how it will be possible to control iRay with more options. In 3ds max 2011 Advantage Pack and 3ds max 2012 we have the possibility to use iRay rendering engine but we have no access to all its features, so this free tool give us the possibility to use it with a good and simple UI. For example we can decide to use CPU or GPU or both, and how many GPUs and CPU threads, adding a ground matte shadow, or matte reflection and so on.