There was a rough guide for string head layers working in an old deleted thread, and I got it working back in January (after it was added) by following your instructions. I've also looked at the brain2d example, which helps a lot, but have you considered a quick Unity Simple and Unity Complex head layers tutorial? I think it would help clarify how to align the position of the heads in animator for beginners, and remind people like me who've forgotten how to do it! 😜 I checked the manual too but I couldn't find a wealth of information on how to wire them up.
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Eyes open is baked into the head, there is a seperate layer for looking left, right and blink. There is a blink timer that fires off every few seconds that turns on and then off the blink layer, but only if they are look forward. If they are looking left or right, it skips the blink. It might also skip the blink if they are talking. If they layer doesn’t exist, it’s also ignored, so if the actor blinks while using a special-case animation, nothing breaks.
I presume this workflow would be easy enough to implement using animator layers in Unity? I'm passing this on as I'm interested if this would be your recommended way of working with Unity and AC's head layer mechanics. For eyes to work in the dynamic way they do on Thimbleweed Park, would you suggest using this way of layering elements?