While the Leap’s cameras seem to only use infrared light (provided by three infrared LEDs inside the unit), the Haptix can use ambient light and infrared. Ambient light enables the capturing of much more detail, which is a boon for accuracy, but it requires “a few tricks” for the computer vision algorithm to handle that much data in real time.

http://www.extremetech.com/extreme/163929-haptix-turns-any-surface-into-a-multi-touch-interface-for-70