Nuke AOVs, merged or split, Shuffle vs ShuffleCopy
Channel: 3DGO
Date: 2020-04-14

More experienced users often render out multi channel exrs (a single exr file with multiple AOVs), and then use a shuffle node to grab the AOVs they need. 

New users might prefer to render out AOVs separately as they can see each AOV in its own read node.  However in this setup you need to use a shuffle copy instead of a shuffle to get the alpha from the beauty pass (RGBA).