closestPoint = (line, point) => {
  const lpoint = line[0]
  const ldirection = line[1]

  const a = vec3.dot(vec3.subtract(vec3.create(), point, lpoint), ldirection)
  const b = vec3.dot(ldirection, ldirection)
  const t = a / b

  const closestpoint = vec3.scale(vec3.create(), ldirection, t)
  vec3.add(closestpoint, closestpoint, lpoint)
  return closestpoint
}
Determine the closest point on the given line to the given point.

@param {line3} line - line of reference
@param {vec3} point - point of reference
@returns {vec3} a point
@alias module:modeling/maths/line3.closestPoint