CGAL 6.0 - 2D and 3D Linear Geometry Kernel
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Definition

Operations

A model of this concept must provide:

Comparison_result operator() (const Kernel::Point_3 &p, const Kernel::Point_3 &q, const Kernel::Point_3 &r, const Kernel::Point_3 &s)
 compares the slopes of the segments (p,q) and (r,s), where the slope is the variation of the z-coordinate from the first to the second point of the segment divided by the length of the segment.