Determining regions that are occluded from an observation point

Details Determining regions that are occluded from an observation point Determining regions that are occluded from an observation point

2005-11-29

2005-11-29

Nguyen, Phu K. (Department: 2673)

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

C345S419000

Reexamination Certificate

active

06970164

ABSTRACT:
A method and system for defining a horizon on the surface with reference to the observation point, and identifying a region within the space that is beneath the horizon. Identifying a region that is beneath the horizon includes projecting a ray from the observation point that intersects the horizon and defines an area that is occluded from the observation point. The method and system may also include determining the depth of the region that is beneath the horizon and disregarding this region when the depth is less than a predetermined threshold. In addition, the method and system may identify a region within the space that is beyond the horizon.

REFERENCES:
patent: 4645459 (1987-02-01), Graf et al.
patent: 6747649 (2004-06-01), Sanz-Pastor et al.
Szenberg et al, An Algorithm for the Visualization of a Terrain with Objects, Computer Graphics & Image Processing Proceedings, Dec. 1997, pp. 103-110.
Dollner et al., Texturing Techniques for Terrain Visualization, Proceedings of the Conference on Visualization, Oct. 200 pp. 227-235.
Lloyd et al., Horizon Occlusion Culling for Realtime Rendering of Hierarchical Terrains, Proceedings of the conference on Visualization, Oct. 2002, pp. 1-7.

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