Three-dimensional arrow for computer graphics

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...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: HILL, KENNETH JAMIESON
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung: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.