Invention Grant
- Patent Title: Method for accelerated determination of occlusion between polygons
- Patent Title (中): 多边形加速确定闭塞的方法
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Application No.: US12196020Application Date: 2008-08-21
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Publication No.: US07903108B2Publication Date: 2011-03-08
- Inventor: Brian Jacobson
- Applicant: Brian Jacobson
- Applicant Address: US WA Bellevue
- Assignee: Valve Corporation
- Current Assignee: Valve Corporation
- Current Assignee Address: US WA Bellevue
- Agency: Frommer Lawrence & Haug LLP
- Agent Jamie L. Wiegand
- Main IPC: G06T1/00
- IPC: G06T1/00

Abstract:
The invention describes a method and system for use in occlusion culling of polygons in an interactive environment, such as a game. The invention employs a boundary box to simplify the testing of occludee polygons. Occluders and occludees are also transformed into non-interpenetrating, non-overlapping polygons. Winged-edges are employed to minimize a per occludee computational cost due to precision problems that may arise at non-overlapping edges. The invention then proceeds through an active edge list to identify edge discontinuities (e.g., where an edge is added or removed from the active edge list). Depth analysis is employed to determine whether an occluder occludes an occludee at the edge discontinuity. Moreover, the invention only performs depth analysis for those locations of a screen display where an occludee is determined to reside, thereby minimizing unnecessary computations.
Public/Granted literature
- US20080309659A1 METHOD FOR ACCELERATED DETERMINATION OF OCCLUSION BETWEEN POLYGONS Public/Granted day:2008-12-18
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