05 Three.js一个好的结构书写

admin · 发表于 2021-1-3 10:47:05

学习three.js也有两天了，现在也在不间断的学习相关知识，了解three.js的规则。也做了两个简单的案例，感受到了three.js的强大，研究了一些别人的代码，现在想找到一种适合自己的书写代码。
今天，还真的找到了一种感觉特别适合自己的方法，自己写js的时候貌似也这么写。但是由于学了两个月的WebGL的基础，学的有点懵逼，感觉自己书写正常js的能力都快忘记了。今天，看到这个案例，感觉自己的灵感直接来到了。
每个three.js案例基本上都会包括渲染器、相机、场景、光源和模型。我以后书写相关代码会把它们封装成一个个的方法，然后等待页面加载完后，调用一下即可。
下面是我自己定义的方法名：
初始化渲染器：initRender
初始化相机：initCamera
初始化场景：initScene
初始化灯源：initLight
初始化模型：initModel
动画：animate
绘制：draw
下面是一个案例，生成了42条线

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Three框架</title>
<script src="https://www.wjceo.com/lib/three.js"></script>
<style type="text/css">
html, body {
margin: 0;
height: 100%;
}
div#canvas-frame {
border: none;
cursor: pointer;
width: 100%;
height: 100%;
background-color: #EEEEEE;
}
canvas {
display: block;
}
</style>
<script>
//渲染器
var renderer,width,height;
function initRender() {
width = document.getElementById('canvas-frame').clientWidth;
height = document.getElementById('canvas-frame').clientHeight;
renderer = new THREE.WebGLRenderer({
antialias: true
});
renderer.setSize(width, height);
document.getElementById('canvas-frame').appendChild(renderer.domElement);
renderer.setClearColor(0xffffff, 1.0);
}
//相机
var camera;
function initCamera() {
camera = new THREE.PerspectiveCamera(70, width / height, 1, 1000);
camera.position.x = 0;
camera.position.y = 900;
camera.position.z = 0;
camera.lookAt(new THREE.Vector3(0,0,0));
}
//场景
var scene;
function initScene() {
scene = new THREE.Scene();
}
//光源
var light;
function initLight() {
light = new THREE.DirectionalLight(0xFF0000, 1.0, 0);
light.position.set(100, 100, 200);
scene.add(light);
}
//模型
function initModel() {
//轴辅助（每一个轴的长度）
var object = new THREE.AxesHelper(500);
scene.add(object);
var geometry = new THREE.Geometry();
geometry.vertices.push(new THREE.Vector3(-500, 0, 0));
geometry.vertices.push(new THREE.Vector3(500, 0, 0));
for (var i = 0; i <= 20; i++) {
var line = new THREE.Line(geometry, new THREE.LineBasicMaterial({color: randomColor(), opacity: 1}));
line.position.z = ( i * 50 ) - 500;
scene.add(line);
var line = new THREE.Line(geometry, new THREE.LineBasicMaterial({color: randomColor(), opacity: 1}));
line.position.x = ( i * 50 ) - 500;
line.rotation.y = 90 * Math.PI / 180;
scene.add(line);
}
console.log(scene);
}
//绘制
function draw() {
initRender();
initCamera();
initScene();
initLight();
initModel();
renderer.render(scene, camera);
}
//生成随机颜色
function randomColor() {
var arrHex = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"],
strHex = "0x",
index;
for (var i = 0; i < 6; i++) {
index = Math.round(Math.random() * 15);
strHex += arrHex[index];
}
return eval(strHex);
}
</script>
</head>
<body onload="draw();">
<div id="canvas-frame"></div>
</body>
</html>

复制代码

		自动登录	找回密码
密码			立即注册

05 Three.js一个好的结构书写

相关帖子