Three.js - 设置高光贴图

通过高光贴图可以实现部分区域反光,像素值为白色的地方会发光,黑色的不会反光,高光的颜色默认为灰黑色。

1、示例

示例
https://ithanmang.gitee.io/threejs/home/201809/20180906/02-specular-texture.html
效果
Three.js - 设置高光贴图_第1张图片
可以通过调节颜色,来让海洋反射出不同的色彩

2、实现步骤

2.1、设置材质的specularMap属性

加载进来的是一张黑白图,白色的会反光黑色部分不会反光.

material.specularMap = new THREE.TextureLoader().load('../../textures/planets/EarthSpec.png')

Three.js - 设置高光贴图_第2张图片

2.2、设置,高光的颜色specular
material.specular = new THREE.Color(0x3366ff);
2.3、设置shininess

shininess是高光的反光度,默认值为30,值越大,反光点越集中

material.shininess = 2;

3、示例代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <link rel="icon" href="../../../three.png">
    <title>高光贴图</title>
    <style>
        body {
            margin: 0;
            overflow: hidden; /* 溢出隐藏 */
        }

        #loading {
            position: fixed;
            top: 50%;
            left: 50%;
            color: #FFFFFF;
            font-size: 20px;
            margin-top: -30px;
            margin-left: -40px;
        }
    </style>
    <script src="../../libs/build/three-r93.js"></script>
    <script src="../../libs/examples/js/Detector.js"></script>
    <script src="../../libs/examples/js/libs/dat.gui.min.js"></script>
    <script src="../../libs/examples/js/libs/stats.min.js"></script>
    <script src="../../libs/examples/js/controls/OrbitControls.js"></script>
</head>
<body>
<p id="loading">loading......</p>
<script>

    let scene, camera, renderer, controls, guiControls;
    let stats = initStats();

    /* 场景 */
    function initScene() {

        scene = new THREE.Scene();

    }

    /* 相机 */
    function initCamera() {

        camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 10000);
        camera.position.set(0, 10, 120);
        camera.lookAt(new THREE.Vector3(0, 0, 0));

    }

    /* 渲染器 */
    function initRender() {

        renderer = new THREE.WebGLRenderer({antialias: true});
        renderer.setSize(window.innerWidth, window.innerHeight);
        renderer.setPixelRatio(window.devicePixelRatio);

        document.body.appendChild(renderer.domElement);

    }

    /* 灯光 */
    function initLight() {

        scene.add(new THREE.AmbientLight(0x0c0c0c));

        let spotLight1 = new THREE.SpotLight(0xffffff);
        spotLight1.position.set(-400, -400, -400);

        let spotLight2 = new THREE.SpotLight(0xffffff);
        spotLight2.position.set(400, 400, 400);

        // scene.add(spotLight1);
        scene.add(spotLight2);

    }

    /* 控制器 */
    function initControls() {

        /* 地图控件 */
        controls = new THREE.OrbitControls(camera);

        /* 属性参数 */

    }

    /* 调试插件 */
    function initGui() {

        guiControls = new function () {

            this.specular = sphere.material.specular.getStyle();
            this.shininess = sphere.material.shininess;

        };

        let gui = new dat.GUI();
        gui.addColor(guiControls, 'specular').onChange(function (e) {

           sphere.material.specular.setStyle(e);

        });
        gui.add(guiControls,'shininess', 0, 100).onChange(function (e) {
           sphere.material.shininess = e;
        });

    }

    /* 场景中的内容 */
    let sphere;
    function initContent() {

        let material = new THREE.MeshPhongMaterial();
        material.map = new THREE.TextureLoader().load('../../textures/planets/Earth.png');
        material.normalMap = new THREE.TextureLoader().load('../../textures/planets/EarthNormal.png');
        material.specularMap = new THREE.TextureLoader().load('../../textures/planets/EarthSpec.png', function () {
            removeLoading();
        });
        material.specular = new THREE.Color(0x3366ff);
        material.shininess = 2;
        let sphereGeometry = new THREE.SphereGeometry(40, 50, 50);

        sphere = new THREE.Mesh(sphereGeometry, material);

        scene.add(sphere);

    }

    /* 移除加载元素 */
    function removeLoading() {

        document.getElementById('loading').style.display = 'none';

    }

    /* 性能插件 */
    function initStats() {

        let stats = new Stats();

        document.body.appendChild(stats.domElement);

        return stats;

    }

    /* 窗口变动触发 */
    function onWindowResize() {

        camera.aspect = window.innerWidth / window.innerHeight;
        camera.updateProjectionMatrix();
        renderer.setSize(window.innerWidth, window.innerHeight);

    }

    /* 数据更新 */
    function update() {

        stats.update();
        controls.update();

        if (sphere) {

            sphere.rotateY(0.001);

        }

    }

    /* 初始化 */
    function init() {

        if (!Detector.webgl) Detector.addGetWebGLMessage();

        initScene();
        initCamera();
        initRender();
        initLight();
        initControls();
        initContent();
        initGui();

        /* 监听事件 */
        window.addEventListener('resize', onWindowResize, false);

    }

    /* 循环渲染 */
    function animate() {

        requestAnimationFrame(animate);
        renderer.render(scene, camera);
        update();

    }

    /* 初始加载 */
    (function () {
        console.log("three init start...");

        init();
        animate();

        console.log("three init end...");
    })();

</script>
</body>
</html>

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