Found a video from a Leap Motion Developer Meetup where they are presenting some findings from UI design research. While focusing exclusively on UI design they still raise some very interesting results that are highly applicable to my own project.
https://www.youtube.com/watch?v=XI3yvLOon08
Two of the most valuable points for the project I feel were that:
1- Users are not very aware of their hand position relative to the device when moving in Z space (forward and backward from the user). This must be taken into consideration when asking users to perform this gesture, particularly if accuracy on behalf of the user is required. Accurately pointing toward the screen (while physically moving the hand forward) also proves difficult, as our hands generally move in arcs and as such change their X/Y position as they move along Z.
2- Dynamic feedback in regard to on-screen position relative to user hand position is also absolutely crucial. Without this users can become very confused or disoriented, hampering the user experience. Any sort of small visual change to show awareness of user action is better and if it can reinforce action (or is some cases dissuade action) then this can only improve the experience.
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