Render out multiple passes in maya as an OpenExr file then composite them in nuke. Tutorial aims to get you up and running with multipass rendering in Maya as quickly as possible. In this example we render out and comp an ambient occlusion pass a diffuse pass a specular pass and a shadow pass.
Multipass Rendering in Maya Composite in Nuke - YouTube
You might want to change this to HD in youtube
n'joy
Dave
