更改平面threeJS的三角形的颜色

// 引入three.js库
import * as THREE from 'three';

// 创建场景
const scene = new THREE.Scene();

// 创建相机
const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
camera.position.z = 5;

// 创建渲染器
const renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

// 创建平面
const geometry = new THREE.Geometry();
geometry.vertices.push(new THREE.Vector3(-1, -1, 0));
geometry.vertices.push(new THREE.Vector3(1, -1, 0));
geometry.vertices.push(new THREE.Vector3(0, 1, 0));
geometry.faces.push(new THREE.Face3(0, 1, 2));

// 创建材质
const material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });

// 创建网格
const mesh = new THREE.Mesh(geometry, material);

// 将网格添加到场景中
scene.add(mesh);

// 渲染循环
function animate() {
  requestAnimationFrame(animate);

  // 更新材质的颜色属性
  material.color.setHex(Math.random() * 0xffffff);

  renderer.render(scene, camera);
}
animate();