The present invention is for a decision support tool for 3D LOS visualization in user interactive 3D virtual reality environments for enabling true 3D LOS analysis for assisting decision making in a wide range of applications including inter alia land development projects, military operational planning, sensor placement in surveillance systems, and the like. The present invention further enables displaying cross sections of 3D virtual reality scenes, and determination of the minimum elevation of an origin node for ensuring a single continuous unobstructed 3D LOS with each target node of at least one stationary target node.
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