如何在three.js中只显示边缘线？

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

// 创建物体
var geometry = new THREE.BoxGeometry(1, 1, 1);
var material = new THREE.MeshBasicMaterial({ color: 0x00ff00 });
var cube = new THREE.Mesh(geometry, material);
scene.add(cube);

// 创建边缘线材质
var edges = new THREE.EdgesGeometry(geometry);
var edgeMaterial = new THREE.LineBasicMaterial({ color: 0xffffff });

// 创建线条网格
var edgesMesh = new THREE.LineSegments(edges, edgeMaterial);
cube.add(edgesMesh);

// 设置边缘线材质的属性
edgeMaterial.linewidth = 2;

// 渲染场景
var renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);
renderer.render(scene, camera);