Function VectorMath.ClosestPointOnSegmentXZ
Returns the closest point on the segment in the XZ plane.
                Public
                    Static
            
        Vector3 ClosestPointOnSegmentXZ (
lineStart  |         ||
lineEnd  |         ||
point  |         
Returns the closest point on the segment in the XZ plane.
The y coordinate of the result will be the same as the y coordinate of the point parameter.
The segment is NOT treated as infinite.