  Mixed Reality (MR) and Virtual Reality (VR) simulations are hampered by
requirements for hand controllers or attempts to perseverate in use of
two-dimensional computer interface paradigms from the 1980s. From our efforts
to produce more naturalistic interactions for combat medic training for the
military, USC has developed an open-source toolkit that enables direct hand
controlled responsive interactions that is sensor independent and can function
with depth sensing cameras, webcams or sensory gloves. Natural approaches we
have examined include the ability to manipulate virtual smart objects in a
similar manner to how they are used in the real world. From this research and
review of current literature, we have discerned several best approaches for
hand-based human computer interactions which provide intuitive, responsive,
useful, and low frustration experiences for VR users.
