I mean... I did try a number of things with the buttons, but I couldn't get the hand skeleton to even do the first gesture (touch thumb and index finger while extending all others) with the Vive controllers.
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That did work, but then I couldn't figure out how to make a fist with the Vive controllers. :D Part of the problem is also that the hand skeleton doesn't really match what I'm supposed to do (e.g. when I pulled the trigger, it did accept the first gesture but the hand skeleton actually had all fingers except the thumb folded into a fist).