Efficient rendering utilizing user defined shields and windows

Details Efficient rendering utilizing user defined shields and windows Efficient rendering utilizing user defined shields and windows

1996-11-19

1999-07-20

Nguyen, Phu K.

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

G06F 1500

Patent

active

059261820

ABSTRACT:
A shield is a piece of geometry, such as a rectangle, that defines active/inactive regions in the world coordinate system that depend upon the position and orientation of the camera with respect to the shield. The shield is distinct from the objects that represent the scene. A preprocessing step determines those objects (or portions of objects) of the scene that lie in the inactive region defined by each of the shields. Those objects (or portions of objects) that lie in the inactive region defined by each of the shields are forwarded to the graphics subsystem wherein the objects are rendered for display. On the other hand, those objects (or portions of objects) that lie in the active region defined by each of the shields are not forwarded to the graphics subsystem.

REFERENCES:
patent: 5027292 (1991-06-01), Rossignac et al.
patent: 5268995 (1993-12-01), Diefendorff et al.
patent: 5359704 (1994-10-01), Rossignac et al.
patent: 5428716 (1995-06-01), Brokenshire et al.
Visibility Preprocessing for Interactive Walkthroughs, ACM Press Computer Graphics, vol. 25, No. 4, Jul. 1991, pp. 61-69.
Hierarchical Z-Buffer Visibility Computer Graphics Proceedings, Annual Conference Series, 1993 pp. 231-238.

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