code: function _normalizedCoordinates(x, y, z, w) {
    var magnitude = Math.sqrt(x * x + y * y + z * z + w * w);
    if (magnitude === 0)
      return this;
  
    return {
      "x": x / magnitude,
      "y": y / magnitude,
      "z": z / magnitude,
      "w": w / magnitude};
  }
docs: Returns the normalized coordinates of the given quaternion coordinates
  
  @param {Number} x y z w
  @returns {Object} normalized coordinates