Function d3_geo_cartesianNormalize

d3-3.2.8/d3.js:2259–2264

(d)

    return [ vector[0] * k, vector[1] * k, vector[2] * k ];
  }
  function d3_geo_cartesianNormalize(d) {
    var l = Math.sqrt(d[0] * d[0] + d[1] * d[1] + d[2] * d[2]);
    d[0] /= l;
    d[1] /= l;
    d[2] /= l;
  }
  function d3_geo_spherical(cartesian) {
    return [ Math.atan2(cartesian[1], cartesian[0]), d3_asin(cartesian[2]) ];
  }