在threeJS中创建对象的连通顶点的边上的中点

// 创建几何体对象
var geometry = new THREE.Geometry();

// 定义顶点坐标
var vertices = [
  new THREE.Vector3(0, 0, 0),
  new THREE.Vector3(1, 0, 0),
  new THREE.Vector3(1, 1, 0),
  new THREE.Vector3(0, 1, 0)
];

// 添加顶点对象到几何体对象
for (var i = 0; i < vertices.length; i++) {
  geometry.vertices.push(vertices[i]);
}

// 定义面数据
var faces = [
  new THREE.Face3(0, 1, 2),
  new THREE.Face3(0, 2, 3)
];

// 遍历面数据
for (var i = 0; i < faces.length; i++) {
  var face = faces[i];

  // 获取面的顶点索引
  var v1Index = face.a;
  var v2Index = face.b;
  var v3Index = face.c;

  // 获取连通顶点的边的中点坐标
  var v1 = geometry.vertices[v1Index];
  var v2 = geometry.vertices[v2Index];
  var v3 = geometry.vertices[v3Index];

  var midPoint1 = new THREE.Vector3().addVectors(v1, v2).multiplyScalar(0.5);
  var midPoint2 = new THREE.Vector3().addVectors(v2, v3).multiplyScalar(0.5);
  var midPoint3 = new THREE.Vector3().addVectors(v3, v1).multiplyScalar(0.5);

  // 添加中点坐标到几何体对象的顶点数组
  geometry.vertices.push(midPoint1, midPoint2, midPoint3);
}

// 更新几何体对象的顶点属性
geometry.verticesNeedUpdate = true;