SEARCH MATHEMATICA 8 DOCUMENTATION

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Computational Geometry Package Symbol

Ray

Ray[{x₁, y₁}, {x₂, y₂}]
is an object representing the infinite ray beginning at {x₁, y₁}in the direction of the point {x₂, y₂}.

To use Ray, you first need to load the Computational Geometry Package using Needs["ComputationalGeometry`"].

Ray objects are used in the representation of open polygons in Voronoi diagrams.