The open source ProEXR plugin been updated to bring Cryptomatte to After Effects. Cryptomatte is an open source technology created by Psyop that allows for automatic ID matte generation from 3D scenes which dramatically reduces the number of mattes needed for 3D compositing.

Download

You can download ProEXR 2 from the Cryptomatte Github Repo: https://github.com/Psyop/Cryptomatte