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Method-and-apparatus-capable-of-prioritizing-and-streaming-objects-within-a-3-D-virtual-environment

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Details

Inventors: Cooper, David G.;
Assignee: Adaptive Media Technologies (Sunnyvale, CA)
Primary Examiner: Nguyen; Phu K.
Assistant Examiner:
Attorney, Agent or Firm: Pillsbury Madison & Sutro LLP

A method of assessing objects in a 3D graphical scene provides discovery of the most important objects in that scene from the viewer's perspective at any instant in time. These objects are then queued in priority order and requests for each object's data sent to the server at a rate determined by the available network bandwidth. The importance of each object is recalculated per scene update and new requests are sent out based on these values. Only data requests that can be responded to within the next update cycle are sent, while most request messages are retained. This allows for immediate response to a changing view position, and reduces visual latency, defined as the time that lapses until an object having a data deficit gets that data. Latency is reduced for important objects at the cost of lesser objects. Because important objects are those which contribute most to the visual scene, the overall richness of the scene appears to grow faster than the number of objects received.

DETAILED DESCRIPTION An object of the present invention is to provide a method and apparatus that effectively manages the display of a complex 3-D graphical scene.
Another object of the present invention is to provide a method and apparatus for managing the display of a complex 3-D graphical scene that is capable of working with a large number of objects.
Another object of the present invention is to provide a method and apparatus for managing the display of a complex 3-D graphical scene that is capable of reducing the visual latency of the display in response to a changing viewpoint.
Another object of the present invention is to provide a method and apparatus for managing the display of a complex 3-D graphical scene that effectively utilizes the total bandwidth of the server/client stream.
Another object of the present invention is to provide a method and apparatus for managing the display of a complex 3-D graphical scene that is capable of fairly assessing visual importance of partially transmitted objects as well as fully transmitted objects.
Another object of the present invention is to provide a method and apparatus for managing the display of a complex 3-D graphical scene that requires only bounding box information to assess an object's visual importance.
These and other objects and advantages are accomplished by the present invention by providing, among other features, an object assessment function and a streaming function.
The object assessment function determines the visual importance of objects in a 3D graphical scene while taking into consideration the instantaneous hypothetical viewer's viewpoint of the scene, and determines the order in which those objects should receive data.
The streaming function requests data for those objects from the server in a manner that maximizes the available bandwidth for requesting and transmitting such data.
Reduced visual latency and increased richness of the scene to the perception of the viewer are thereby achieved.

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