Three-dimensional arrow for computer graphics

Details Three-dimensional arrow for computer graphics Three-dimensional arrow for computer graphics

1998-09-30

2000-11-07

Powell, Mark R.

Computer graphics processing and selective visual display system

Display driving control circuitry

Controlling the condition of display elements

345433, 345419, 345427, 345135, G06F 333

Patent

active

061443824

ABSTRACT:
A method, apparatus and article of manufacture for generating and rendering arrowheads that approximate the direction of the arrowhead. A base and an axis vector for the arrowhead are created, and a view direction vector, approximating the direction that a user of a computer is viewing the arrowhead, is determined. The angle between the axis vector and the view direction vector is calculated, and the arrowhead is displayed rotated by the angle between the view direction vector and the axis vector. Silhouette lines and portions of the base are selectively displayed depending on the angle that the arrowhead is viewed from.

REFERENCES:
patent: 5870099 (1999-02-01), Horii
patent: 5999165 (1999-12-01), Matsumoto
patent: 6014142 (2000-01-01), Lahood
patent: 6016145 (2000-01-01), Horvitz
patent: 6016147 (2000-01-01), Gantt
computer generated solid arrow display of 3-D vector fields, Baden Fuller, A.J., pp. May 1-May 4, 1988.
computer screen cursor trajectories as controlled by an accupoint, Phillips, J.G. et al., pp. 314-319, Dec. 1998.
a two-dimensional large scale laser digitizer with a cordless cursor, Ikumatsu Fujimoto, pp. 416-418, 1988.

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