three.js 创建线条

可以使用 Three.js 中的 THREE.Line() 方法来创建线条。以下是一个简单的示例代码：

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

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

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

// 创建线条
var material = new THREE.LineBasicMaterial({ color: 0x0000ff });
var geometry = new THREE.Geometry();
geometry.vertices.push(new THREE.Vector3(-2, 0, 0));
geometry.vertices.push(new THREE.Vector3(0, 2, 0));
geometry.vertices.push(new THREE.Vector3(2, 0, 0));
var line = new THREE.Line(geometry, material);

// 将线条添加到场景中
scene.add(line);

// 渲染场景
function animate() {
    requestAnimationFrame(animate);
    renderer.render(scene, camera);
}
animate();

这段代码将创建一个蓝色的三角形线条，并将其添加到场景中进行渲染。