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今天一個朋友需要一個orb的three場景，爲了更多對threeJS感興趣的同學，特此寫了一個小小的Demo模板。
本模板的基本功能包括：1.燈光 2.渲染器 3.鼠標控制 4.簡單球形（如果是模型，需要添加加載對應模型格式的加載器，加載好模型也可以用本模板） 5.天空盒子 6.自動旋轉
效果圖：
代碼：
<html>
<head>
<title>threeJS模板</title>
<style>
body {
background-color: #000;
margin: 0px;
overflow: hidden;
}
#WebGL {
width: 100%;
height: 100%;
position: absolute;
left: 0;
top: 0;
z-index: 999;
}
</style>
</head>
<body>
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.js"></script>
<script src="three.js"></script>
<script src="OrbitControls.js"></script>
<div id="WebGL"></div>
<script>
'use strict';
var container, camera, scene, renderer, geometry, material, controls; //常用變量
var spotLight, mesh; //自定義對象變量
var target = new THREE.Vector3(0, 30, 0);
var webGLW = $('#WebGL').width();
var webGLH = $('#WebGL').height();
init();
animate();
function init() {
container = document.getElementById('WebGL');
rendererScene(); //場景渲染
sceneBackground();
camera = new THREE.PerspectiveCamera(40, window.innerWidth / window.innerHeight, 0.1, 10000);
camera.position.set(0, 50, -200);
camera.lookAt(target);
plane() //// 地面
lights(); //燈光：聚光燈
loadModel(); //添加模型
OrbitControls(camera, renderer); //OrbitControls控件模塊，90版本鼠標右鍵上下是移動，96版本之後右鍵上下是縮放
window.addEventListener('resize', onWindowResize, false); //監聽屏幕變化
}
function sceneBackground() {
scene = new THREE.Scene();
// scene.background = new THREE.Color(0xcfcfcf);//可以用圖片代替作爲背景
var path = './sky/';
var format = '.jpg';
new THREE.CubeTextureLoader().load([
path + 'px' + format, path + 'nx' + format, //右左
path + 'py' + format, path + 'ny' + format, //上下
path + 'pz' + format, path + 'nz' + format //前後
], function (res) {
scene.background = res;
});
// // scene.fog = new THREE.Fog(0xa0a0a0, 200, 1000); //霧
}
function plane() {
// 地面
let grid_mesh = new THREE.Mesh(new THREE.PlaneBufferGeometry(200, 200), new THREE.MeshPhongMaterial({
color: 0x999999,
// depthWrite: false
}));
grid_mesh.rotation.x = -Math.PI / 2;
grid_mesh.receiveShadow = true;
scene.add(grid_mesh);
var grid = new THREE.GridHelper(200, 20, 0x000000, 0x000000);
grid.material.opacity = 0.2;
grid.material.transparent = true;
scene.add(grid);
}
function lights() { //光影自己改哦
var ambient = new THREE.AmbientLight(0xffffff);
scene.add(ambient);
//聚光燈
// SpotLight( color：顏色, intensity：強度, distance：發光距離, angle：角度, penumbra：邊緣範圍, decay：衰減 )
spotLight = new THREE.SpotLight(0xffffff, 1);
spotLight.position.set(0, 120, 0);
spotLight.angle = Math.PI / 6;
spotLight.penumbra = 0.05; //邊緣範圍，反比
spotLight.decay = 2; //衰減係數，反比
spotLight.distance = 400; //發光距離
spotLight.castShadow = true; //陰影
spotLight.shadow.mapSize.width = 1024;
spotLight.shadow.mapSize.height = 1024;
spotLight.shadow.camera.near = 10; //近截面
spotLight.shadow.camera.far = 250;
scene.add(spotLight);
}
function lightsHelper(lightsObject) {
// 聚光燈顯示助手SpotLightHelper( light:燈光, color：顏色 )
var lightHelper = new THREE.SpotLightHelper(lightsObject, 0xdfdfdf);
scene.add(lightHelper);
var mesh = new THREE.Mesh(new THREE.PlaneBufferGeometry(100, 100), new THREE.MeshPhongMaterial({
color: 0x9cfcf99,
depthWrite: false
}));
mesh.rotation.x = -Math.PI / 2;
mesh.position.set(0, -20, 0)
mesh.receiveShadow = true;
scene.add(mesh);
}
function loadModel() { //模型
mesh = new THREE.Mesh(
new THREE.SphereBufferGeometry(20, 16, 8),
new THREE.MeshBasicMaterial({
color: 0xffffff,
wireframe: true
})
);
mesh.position.set(0, 30, 0)
scene.add(mesh);
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function rendererScene() {
renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
renderer.shadowMap.enabled = true;
renderer.shadowMap.type = THREE.PCFSoftShadowMap;
renderer.gammaInput = true;
renderer.gammaOutput = true;
container.appendChild(renderer.domElement);
}
function OrbitControls(camera, renderer) {
//OrbitControls控件操作模塊
controls = new THREE.OrbitControls(camera, renderer.domElement);
controls.target = target; //控制的target
controls.autoRotate = true; //是否自動旋轉
controls.autoRotateSpeed = 0.5; //自動旋轉速度，正比
}
function animate() {
requestAnimationFrame(animate);
if (controls) controls.update();
renderer.render(scene, camera);
};
</script>
</body>
</html>