three.js的三大要素，Scene,Camera,render；
1. 构建场景
scene = new THREE.Scene();
2.创建相机
var camera = new THREE.PerspectiveCamera(75,window.innerWidth/window.innerHeight,0.1,1000)
3.渲染
var renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth,window.innerHeight);
document.body.appendChild(renderer.domElement);
4.创建模型
4.1 几何模型
var geometry = new THREE.CubeGeometry(1,1,1);
4.2 材质
var material = new THREE.MeshBasicMaterial({color: 0x00ff00});
4.3 添加到场景
var cube = new THREE.Mesh(geometry,material);
scene.add(cube);
5 循环渲染
function render() {
requestAnimationFrame(render);
cube.rotation.x +=0.1;
cube.rotation.y +=0.1;
renderer.render(scene,camera);
}
6.执行函数 render();
附上源码：
<!DOCTYPE html>
<html>
<head>
<title>three.js初级1</title>
<style>
canvas{ 100%;height: 100%}
</style>
<script src="three.js"></script>
</head>
<body>
<script type="text/javascript">
var scene = new THREE.Scene();//构建场景
var camera = new THREE.PerspectiveCamera(75,window.innerWidth/window.innerHeight,0.1,1000);//相机
var renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth,window.innerHeight);
document.body.appendChild(renderer.domElement);
var geometry = new THREE.CubeGeometry(1,1,1);
var material = new THREE.MeshBasicMaterial({color: 0x00ff00});
var cube = new THREE.Mesh(geometry,material);
scene.add(cube);
camera.position.z = 5;
function render() {
requestAnimationFrame(render);
cube.rotation.x +=0.1;
cube.rotation.y +=0.1;
renderer.render(scene,camera);
}
render();
</script>
</body>
</html>