Is there a way to use tintmaps to create patterns of shadows on the the char (e.g. body in shadow, head is not) rather than tint them completely? For example, wha'ts the best way to achieve this effect?
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This won't involve AC, but you can use Unity's URP 2D lighting system to achieve textured-shadows on sprites.
https://unity.com/how-to/2d-light-shadow-techniques-in-the-universal-render-pipeline
See the "Sprite" light type - this allows you to assign a "light texture" to a light that will overlay sprites that are lit by it.