Three.js光照技术为3D场景注入灵魂示例详解

// 创建环境光，颜色为白色，强度为1
const ambientLight = new THREE.AmbientLight(0xffffff, 1);
scene.add(ambientLight);

// 创建点光源，颜色为黄色，强度为2，衰减范围为10
const pointLight = new THREE.PointLight(0xffff00, 2, 10);
pointLight.position.set(5, 5, 5); // 设置光源位置
scene.add(pointLight);

// 创建平行光，颜色为蓝色，强度为1
const directionalLight = new THREE.DirectionalLight(0x0000ff, 1);
directionalLight.position.set(0, 10, 0); // 设置光源位置
scene.add(directionalLight);

// 创建聚光灯，颜色为白色，强度为2，角度为45度
const spotLight = new THREE.SpotLight(0xffffff, 2, 100, Math.PI / 4);
spotLight.position.set(5, 5, 5); // 设置光源位置
spotLight.target.position.set(0, 0, 0); // 设置光照目标
scene.add(spotLight);

// 创建区域光，尺寸为2x2，颜色为白色，强度为1
const rectAreaLight = new THREE.RectAreaLight(0xffffff, 1, 2, 2);
rectAreaLight.position.set(0, 5, 0); // 设置光源位置
scene.add(rectAreaLight);

// 加载光照贴图
const loader = new THREE.TextureLoader();
const lightMap = loader.load('lightMap.jpg');

// 创建LightProbe并设置其位置
const lightProbe = new THREE.LightProbe();
lightProbe.position.set(0, 5, 0);
scene.add(lightProbe);

// 启用平行光的阴影效果
directionalLight.castShadow = true;
directionalLight.shadow.mapSize.width = 2048;
directionalLight.shadow.mapSize.height = 2048;

// 创建场景、相机和渲染器
const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
const renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

// 创建一个红色立方体
const geometry = new THREE.BoxGeometry();
const material = new THREE.MeshStandardMaterial({ color: 0xff0000 });
const cube = new THREE.Mesh(geometry, material);
scene.add(cube);

// 添加环境光
const ambientLight = new THREE.AmbientLight(0xffffff, 0.5);
scene.add(ambientLight);

// 添加平行光
const directionalLight = new THREE.DirectionalLight(0xffffff, 1);
directionalLight.position.set(5, 5, 5);
directionalLight.castShadow = true;
scene.add(directionalLight);

camera.position.z = 10;

function animate() {
    requestAnimationFrame(animate);
    cube.rotation.x += 0.01;
    cube.rotation.y += 0.01;
    renderer.render(scene, camera);
}
animate();