【前端知识】Three 学习日志(六)—— 环境光与平行光

Three 学习日志(六)—— 环境光与平行光

一、设置环境光
//环境光:没有特定方向,整体改变场景的光照明暗
const ambient = new THREE.AmbientLight(0xffffff, 0.4);
scene.add(ambient);

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二、调整环境光强度
//环境光强度调整为0.8
const ambient = new THREE.AmbientLight(0xffffff, 0.8);
scene.add(ambient);

在这里插入图片描述

三、设置平行光与平行光辅助
// 平行光
const directionalLight = new THREE.DirectionalLight(0xffffff, 1);
// 设置光源的方向:通过光源position属性和目标指向对象的position属性计算
directionalLight.position.set(80, 100, 50);
// 方向光指向对象网格模型mesh,可以不设置,默认的位置是0,0,0
directionalLight.target = mesh;
scene.add(directionalLight);

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四、完整代码
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Learn Three</title>
    <!-- 引入three,下载地址参考:http://www.webgl3d.cn/pages/aac9ab/#%E7%89%B9%E5%AE%9A%E7%89%88%E6%9C%ACthree-js%E6%96%87%E4%BB%B6%E5%8C%85%E4%B8%8B%E8%BD%BD -->
    <script src="../build/three.js"></script>
    <!-- 引入相机控件 -->
    <script type="importmap">
        {
      
      
            "imports": {
      
      
                "three": "../build/three.module.js",
                "three/addons/": "../examples/jsm/"
            }
        }
    </script>
</head>

<body>
    <script type="module">
        // 引入轨道控制器扩展库OrbitControls.js
        import {
      
       OrbitControls } from 'three/addons/controls/OrbitControls.js';
        // 创建3D场景对象Scene
        const scene = new THREE.Scene();
        const axesHelper = new THREE.AxesHelper(150);
        scene.add(axesHelper);
        const geometry = new THREE.BoxGeometry(100, 100, 100);
        const material = new THREE.MeshLambertMaterial();
        const mesh = new THREE.Mesh(geometry, material); //网格模型对象Mesh
        mesh.position.set(0, 0, 0);
        scene.add(mesh);

        // //环境光强度调整为0.8
        // const ambient = new THREE.AmbientLight(0xffffff, 0.8);
        // scene.add(ambient);

        // 平行光
        const directionalLight = new THREE.DirectionalLight(0xffffff, 1);
        // 设置光源的方向:通过光源position属性和目标指向对象的position属性计算
        directionalLight.position.set(80, 100, 50);
        // 方向光指向对象网格模型mesh,可以不设置,默认的位置是0,0,0
        directionalLight.target = mesh;
        scene.add(directionalLight);

        // DirectionalLightHelper:可视化平行光
        const dirLightHelper = new THREE.DirectionalLightHelper(directionalLight, 5,0xff0000);
        scene.add(dirLightHelper);

        const camera = new THREE.PerspectiveCamera();
        camera.position.set(200, 200, 200);
        camera.lookAt(0, 0, 0);
        const width = 800; //宽度
        const height = 500; //高度
        const renderer = new THREE.WebGLRenderer();
        renderer.setSize(width, height);
        renderer.render(scene, camera); //执行渲染操作
        document.body.appendChild(renderer.domElement);
        // 设置相机控件轨道控制器
        const controls = new OrbitControls(camera, renderer.domElement);
        // 如果OrbitControls改变了相机参数,重新调用渲染器渲染三维场景
        controls.addEventListener('change', function () {
      
      
            renderer.render(scene, camera); //执行渲染操作
        });//监听鼠标、键盘事件

    </script>
</body>

</html>

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转载自blog.csdn.net/weixin_42919342/article/details/133013511