如何用three.js，LineBasicMaterial来设置绘制线的不透明度？

// 创建一个LineBasicMaterial材质
var material = new THREE.LineBasicMaterial({
  color: 0x00ff00, // 线的颜色
  opacity: 0.5, // 设置不透明度为0.5
  transparent: true // 开启透明度
});

// 创建一个几何体，例如一条线段
var geometry = new THREE.Geometry();
geometry.vertices.push(
  new THREE.Vector3(-10, 0, 0),
  new THREE.Vector3(0, 10, 0),
  new THREE.Vector3(10, 0, 0)
);

// 创建线条对象
var line = new THREE.Line(geometry, material);

// 将线条对象添加到场景中进行渲染
scene.add(line);