System and method for using a pointing device to indicate moveme

Details System and method for using a pointing device to indicate moveme System and method for using a pointing device to indicate moveme

1996-12-17

1998-11-24

Vo, Cliff N.

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

G06T 1500

Patent

active

058414401

ABSTRACT:
A system and method of displaying movement in three-dimensional space in response to input from a conventional two-dimensional pointing device such as a mouse or trackball. The three-dimensional space is projected onto a two-dimensional plane for display in a window on a display screen. A viewpoint position, which may be the center of the window, is defined as the current virtual position of the "camera" through which the three-dimensional space is viewed. The user manipulates an on-screen cursor across the window to specify a direction of movement in the two-dimensional plane. A three-dimensional direction of movement is derived from the user's input by defining a sphere having a center corresponding to a the center of the two-dimensional plane, and determining the intersection of a line perpendicular to the plane at the cursor location with the surface of the sphere. The direction of movement is then defined as a vector from the origin to the determined intersection. The system and method distinguish between navigation commands and object manipulation commands according to the timing and context of the commands.

REFERENCES:
patent: 5684943 (1997-11-01), Abraham et al.
patent: 5687304 (1997-11-01), Kiss
patent: 5699497 (1997-12-01), Brdahl et al.
patent: 5745665 (1998-04-01), Pasco

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