如何在3d中定义球面网格的数组？

function createSphereMesh(radius, subdivisions) {
  var vertices = [];
  var indices = [];

  for (var lat = 0; lat <= subdivisions; lat++) {
    var theta = lat * Math.PI / subdivisions;
    var sinTheta = Math.sin(theta);
    var cosTheta = Math.cos(theta);

    for (var lon = 0; lon <= subdivisions; lon++) {
      var phi = lon * 2 * Math.PI / subdivisions;
      var sinPhi = Math.sin(phi);
      var cosPhi = Math.cos(phi);

      var x = cosPhi * sinTheta;
      var y = cosTheta;
      var z = sinPhi * sinTheta;

      vertices.push(radius * x, radius * y, radius * z);
    }
  }

  for (var lat = 0; lat < subdivisions; lat++) {
    for (var lon = 0; lon < subdivisions; lon++) {
      var first = lat * (subdivisions + 1) + lon;
      var second = first + subdivisions + 1;

      indices.push(first, second, first + 1);
      indices.push(second, second + 1, first + 1);
    }
  }

  return { vertices: vertices, indices: indices };
}

var sphereMesh = createSphereMesh(1, 32);
console.log(sphereMesh.vertices); // 球面网格的顶点坐标数组
console.log(sphereMesh.indices); // 球面网格的三角形索引数组