I'm wondering why anti-aliasing is not working for me in Eeevee using Blender 3.6.1 (still an issue in Blender 4.0.0). See the minimal reproducible Blender file here.
Here are some examples. First, this is what I get with 256 render samples. I use the
Anti-Aliasing Node which seems to not have any (visible) effect (playing around with the values, nothing happens).
Compare this with the output I get using the outdated
ID Mask Node:
The edge looks much better now. Yet, this is not a real solution as this is only working with alpha values, so I can't get RGB out of this node.
Note I've seen this SO question, which didn't help me. This answer lead me to the
ID Mask node. This is the UserFeedback during the development of the node in 2021. It looks exactly what I want to have: a global anti-aliasing for Eeevee getting rid of "jagged" edges.