Two animations at once, blending, or overriding

Hello,
Got what is probably a simple fix, but I’ve been having a hard time putting it into words, so its difficult to google. I’m trying to take animated hand positions, and play them on top of any other normal animation. So if I had a clenched fist, or an open hand, I’d want that to play with idle/walking/running etc, without having to animate an entirely new idle/walking/running animation to accommodate the different hand positions. This extends out to play whatever animation state the character is in, but if he/she is holding a tool, their hand closes around it while still playing that animation state. Any help would be appreciated.

That’s not too difficult to do, fortunately! In your animator controller, you can make new layers which will get layered on top of each other. In a layer’s setting, you can then provide a mask which will ensure only parts of your animation get added/overriden.
This only works with humanoid rigs, though.
More info about animation layers here.

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Thanks a bunch! Look forward to giving it a try