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PolyCAD

The Hull Section Sort submenu provides a range of options can be used to sort the order that the sections appear in the Polyline List and the order of points on each polyline section

By X Location

This options sort points in order of ascending X location. The x location of a polyline is the x coordinate of its first point.

By X Location & Define Section Start Point

In addition to the sorting longitudinally as defined above, this option analyses the polyline to identify the starting point (keel location) by selecting the point that has the smallest combined y and z value. This operation will also remove any consecutive points with the same coordinate values.