In the method, a processor generates a three dimensional interface with at least one virtual object, defines a stimulus of the interface, and defines a response to the stimulus. The stimulus is an approach to the virtual object with a finger or other end-effector to within a threshold of the virtual object. When the stimulus is sensed, the response is executed. Stimuli may include touch, click, double click, peg, scale, and swipe gestures. The apparatus includes a processor that generates a three dimensional interface with at least one virtual object, and defines a stimulus for the virtual object and a response to the stimulus. A display outputs the interface and object. A camera or other sensor detects the stimulus, e.g. a gesture with a finger or other end-effector, whereupon the processor executes the response. The apparatus may be part of a head mounted display.