docs: function polar(lat, lng, _vector) {
      const
          vector = typeof _vector !== "undefined" ? _vector : new Float32Array(3),
          radius = Math.cos(lat),
          z = Math.sin(lat),
          x = radius * Math.cos(lng),
          y = radius * Math.sin(lng);
  
      vector[0] = x;
      vector[1] = y;
      vector[2] = z;
  
      return vector;
  }