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
http://www.ithanmang.com/threeJs/home/201809/20180906/02-specular-texture.html
效果
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')；
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>