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I have a setup where there is a square with a shapekey on each corner and I want to use a bone to drive the shape keys as shown in this animation:

enter image description here

However, I've fiddled with curves and tried a couple of expressions (I'm not good with those), but I cant get it to work.

Any ideas?

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    $\begingroup$ you could add a bone set up on the corners which would add 4 additional bones to your current set up. Add a two bones in the middle of the top of the outside square, where one would stay stationary and the other would be restricted to the X-axis & copy the X displacement of the bone that is animated. Then, you could set up a driver to use the displacement difference of those two bones as + or -. $\endgroup$ Apr 30, 2017 at 6:03
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    $\begingroup$ that method seems sound, but I'd rather try another. This will end up adding more bones to an already complex rig (not shown) $\endgroup$
    – Timo
    May 2, 2017 at 22:16

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