curve.closestPointNormalizedLength(point [, opt])

Return the normalized length (distance from the start of the curve / total curve length) of the curve up to the point that lies closest to point.

The function uses the same algorithm as the curve.closestPointT() function. The normalized length of the curve at t closest to point is returned.

The default value for opt.precision is 3; this corresponds to maximum observed error of 0.1%.

The opt.subdivisions property may be specified, directly providing an array of pre-computed curve subdivisions with which to begin the algorithm. Use the curve.getSubdivisions() function to obtain an array of curve subdivisions. The opt.precision property is still necessary, however; it determines the precision of the point search algorithm.