Multipass AOV Arnold Rendering in Maya 2018 for VFX Compositing - Pt 3 Debugging, DOF and Grain HD

Multipass rendering in Arnold for Visual Effects Compositing, including use of aiShadowMatte and AOVs. This tutorial shows you how to debug issues affecting the how the grade nodes work, namely handling premultiplication properly, shuffling the original alpha channel back into the output of the shuffle nodes and removing the black clamp where required. The tutorial also demonstrates how to use a z-depth pass to add depth of field to your composite and the grain node to add noise to your virtual element to match the background plate.