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I'm trying to use a single bone to control a blink on a cartoony character it's normally pretty simple but for this I need the eyelids to disappear at a certain point like when the eyelids are completely wide open.

Right now I have a bone simply driving the shapekey value of the blink from 0 - 1 but I need it to trigger a second shapekey when the bone hits a value of 0.8 or 0.9 so the second shapekey can hide the eyelids by shrinking them down. Not sure if there's a way use the expression box in the driver panel to do this.

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You can do it if you add a driver to the second shape key.

The first driver:

max(min(var/0.8, 1), 0)

The second driver:

1 if var>0.8 else 0
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  • $\begingroup$ Wow thanks! this works great, after posting this I managed to get something using the driver modifiers but it wasn't as clean as I would like. This expression makes things much cleaner when hiding the eyelid mesh. $\endgroup$
    – Chris
    Dec 2, 2020 at 4:05

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