THREE.js平面着色，但有阴影？

// 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);

// 创建平面几何体
var geometry = new THREE.PlaneGeometry(5, 5);

// 创建Phong材质对象
var material = new THREE.MeshPhongMaterial({ color: 0x00ff00 });

// 创建网格对象
var plane = new THREE.Mesh(geometry, material);

// 设置平面接收和投射阴影
plane.receiveShadow = true;
plane.castShadow = true;

// 创建平行光源
var light = new THREE.DirectionalLight(0xffffff, 1);

// 设置光源位置
light.position.set(0, 1, 1);

// 设置光源产生阴影
light.castShadow = true;

// 设置阴影属性
renderer.shadowMap.enabled = true;
renderer.shadowMap.type = THREE.PCFSoftShadowMap;
light.shadow.mapSize.width = 1024;
light.shadow.mapSize.height = 1024;
light.shadow.camera.near = 0.5;
light.shadow.camera.far = 500;

// 将网格对象和光源添加到场景中
scene.add(plane);
scene.add(light);

// 渲染场景
function animate() {
    requestAnimationFrame(animate);
    plane.rotation.x += 0.01;
    plane.rotation.y += 0.01;
    renderer.render(scene, camera);
}
animate();