In Maya 2008 you have the option of the presets to choose which type of render you want to achieve, for example; shadow, AmbOcc, etc.... In 2010, I can not find the presets. I have found a list that has given numerous options such as shadow, raw shadow, etc, but it does not seem to be giving me the results I am looking for even though I have exactly the same objects added to the render layer in 2008 and 2010.