function equals(a, b) {
  var a0 = a[0]
  var a1 = a[1]
  var a2 = a[2]
  var b0 = b[0]
  var b1 = b[1]
  var b2 = b[2]
  return (Math.abs(a0 - b0) <= EPSILON * Math.max(1.0, Math.abs(a0), Math.abs(b0)) &&
          Math.abs(a1 - b1) <= EPSILON * Math.max(1.0, Math.abs(a1), Math.abs(b1)) &&
          Math.abs(a2 - b2) <= EPSILON * Math.max(1.0, Math.abs(a2), Math.abs(b2)))
}
Returns whether or not the vectors have approximately the same elements in the same position.

@param {vec3} a The first vector.
@param {vec3} b The second vector.
@returns {Boolean} True if the vectors are equal, false otherwise.