Left) A mechanic wearing a tracked head-worn display performs a Air Conditioner Maintenance task on a Rolls Royce DART 510 Engine. (Right) A view through the head-worn display depicts information provided using augmented reality to assist the mechanic. Augmented Reality for Air Conditioner Maintenance and Repair (ARMAR). (Left) A user manipulates 3D virtual buttons while receiving haptic feedback from the underlying grooves of an engine compression section. (Right) User sketches of possible natural interfaces constructed with opportunistic surfaces..
