Three-dimensional perceptions in haptic systems
An acoustic field may be produced from a transducer array having known relative positions and orientations In this acoustic field, one or more control points may be defined. An amplitude may be assigned to the control point. Mid-air haptic effect for a virtual object on a human body part may be generated by moving the control point in a single closed curve comprising a plurality of curve segments. The single closed curve traverses at least one location where the human body part intersects with the virtual object. Additionally, a user may interact with virtual three-dimensional content using the user's hands while a tracking system monitoring the user's hands, a physics engine updates the properties of the virtual three-dimensional content and a haptic feedback system provides haptic information to the user.
1. A method comprising:
producing an acoustic field from a transducer array having known relative positions and orientations;
defining a control point wherein the control point has a known spatial relationship relative to the transducer array;
assigning an amplitude to the control point;
generating a mid-air haptic effect for a user by traversing the control point in a closed curve using smooth movement without interruption to minimize unwanted audible noise, wherein the mid-air haptic effect is a sensation across multiple fingers of the user.
2. The method as in claim 1 , wherein
wherein the closed curve comprises a plurality of curve segments.
3. The method as in claim 2 , wherein the closed curve is traversed relative to a normal vector defined relative to the user.
4. The method as in claim 2 , wherein the closed curve comprises multiple curves to provide feedback to multiple users.
5. The method as in claim 2 , wherein the closed curve is defocused at a user's location.
6. The method as in claim 2 , wherein traversing the control point in a single closed curve comprises:
computing a length of the closed curve required to complete a closed path;
for each of the plurality of curve segments, creating additional haptic effects at each intersection with a user;
for the plurality of curve segments that do not contribute to the haptic effects, traversing the control point at a faster speed.