question: public static float approximateLength ( float controlPoints [ ] [ ] ) { float length = 0 ; for ( int i = 0 ; i < controlPoints . length - 1 ; i ++ ) { float xDif = controlPoints [ i + 1 ] [ 0 ] - controlPoints [ i ] [ 0 ] ; float yDif = controlPoints [ i + 1 ] [ 1 ] - controlPoints [ i ] [ 1 ] ; float zDif = controlPoints [ i + 1 ] [ 2 ] - controlPoints [ i ] [ 2 ] ; length += Math . sqrt ( xDif * xDif + yDif * yDif + zDif * zDif ) ; } return length ; }
target:  Compute an approximate length of a Bezier curve given the control points.